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HomeMy WebLinkAboutCC - Soils Reports MATERIALS TESTI NG & INSPECTION ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL ENGINEERING REPORT of Oaks North Subdivision Northeast Corner of McDermott Road and McMillan Road Meridian, ID Prepared for: Coleman Homes, A Toll Brothers Company 3103 West Sheryl Drive, Suite IOO Meridian, ID 83G42 MTI File Number BI80977g 2791 S Victory View Way• Boise, ID 83709•(208)376-4748• Fax(208)322-6515 www.mti-id.com•mti(aDmti-id.com MATERIALS 20 July 2018 TESTI NG & Page# 1 of 51 INSPECTION h l 80977g_geotech.docx ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Mr. Jeff Harris Coleman Homes,A Toll Brothers Company 3103 West Sheryl Drive, Suite 100 Meridian, ID 83642 208-424-0020 Re: Geotechnical Engineering Report Oaks North Subdivision Northeast Corner of McDermott Road and McMillan Road Meridian, ID Dear Mr. Harris: In compliance with your instructions, MTI has conducted a soils exploration and foundation evaluation for the above referenced development. Fieldwork for this investigation was conducted on from 28 to 29 June and 16 July 2018. Data have been analyzed to evaluate pertinent geotechnical conditions. Results of this investigation, together with our recommendations,are to be found in the following report. We have provided a PDF copy for your review and distribution. Often, questions arise concerning soil conditions because of design and construction details that occur on a project. MTI would be pleased to continue our role as geotechnical engineers during project implementation. Additionally, MTI can provide materials testing and special inspection services during construction of this project. If you will advise us of the appropriate time to discuss these engineering services, we will meet with you at your convenience. MTI appreciates this opportunity to be of service to you and looks forward to working with you in the future. If you have questions,please call (208)376-4748. Respectfully Submitted, Materials Testing& Inspection ,EMSFNCB o ti LIP- 14919onica Saculles, P.E. Reviewed by: El' abeth Brown, P.E. Senior Geotechnical E i g v Geotechnical Services Manager O �rF0F10P��g \��cA SAC���' 2791 S Victory View Way•Boise, ID 83709•(208)3764748•Fax(208)322-6515 Copyright 0 www.mti-id.com•mti(d)m Testing 3 ti-id.com g&I Materials Inspection MATERIALS 20 July 2018 TESTI NG & Page#2 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections TABLE OF CONTENTS INTRODUCTION...............................................................................................................................................................3 ProjectDescription.................................................................................................................................................3 Authorization..........................................................................................................................................................3 Purpose...................................................................................................................................................................3 Scopeof Investigation............................................................................................................................................3 Warranty and Limiting Conditions.........................................................................................................................4 SITEDESCRIPTION..........................................................................................................................................................5 SiteAccess..............................................................................................................................................................5 RegionalGeology...................................................................................................................................................5 General Site Characteristics....................................................................................................................................6 Regional Site Climatology and Geochemistry........................................................................................................6 SEISMIC SITE EVALUATION............................................................................................................................................6 GeoseismicSetting.................................................................................................................................................6 Seismic Design Parameter Values..........................................................................................................................6 SOILSEXPLORATION......................................................................................................................................................8 Exploration and Sampling Procedures....................................................................................................................8 LaboratoryTesting Program...................................................................................................................................8 Soiland Sediment Profile.......................................................................................................................................8 VolatileOrganic Scan.............................................................................................................................................9 SITEHYDROLOGY...........................................................................................................................................................9 Groundwater...........................................................................................................................................................9 SoilInfiltration Rates............................................................................................................................................10 FOUNDATION,SLAB,AND PAVEMENT DISCUSSION AND RECOMMENDATIONS.............................................................10 Foundation Design Recommendations.................................................................................................................11 Crawl Space Recommendations...........................................................................................................................11 Floor,Patio,and Garage Slab-on-Grade...............................................................................................................11 Recommended Pavement Section.........................................................................................................................12 FlexiblePavement Section...................................................................................................................................12 Pavement Subgrade Preparation...........................................................................................................................13 Common Pavement Section Construction Issues.................................................................................................13 CONSTRUCTION CONSIDERATIONS...............................................................................................................................14 Earthwork.............................................................................................................................................................14 DryWeather.........................................................................................................................................................14 WetWeather.........................................................................................................................................................15 SoftSubgrade Soils..............................................................................................................................................15 FrozenSubgrade Soils..........................................................................................................................................15 StructuralFill........................................................................................................................................................16 Backfillof Walls...................................................................................................................................................17 Excavations...........................................................................................................................................................17 GroundwaterControl............................................................................................................................................17 GENERALCOMMENTS..................................................................................................................................................18 REFERENCES.................................................................................................................................................................19 APPENDICES.................................................................................................................................................................20 AcronymList........................................................................................................................................................20 Geotechnical General Notes.................................................................................................................................21 Geotechnical Investigation Test Pit Log...............................................................................................................22 Gravel Equivalent Method—Pavement Thickness Design Procedures................................................................46 R-Value Laboratory Test Data..............................................................................................................................47 Plate1:Vicinity Map............................................................................................................................................50 Plate2: Site Map...................................................................................................................................................51 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 3 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections INTRODUCTION This report presents results of a geotechnical investigation and analysis in support of data utilized in design of structures as defined in the 2015 International Building Code (IBC). Information in support of groundwater and stormwater issues pertinent to the practice of Civil Engineering is included. Observations and recommendations relevant to the earthwork phase of the project are also presented. Revisions in plans or drawings for the proposed development from those enumerated in this report should be brought to the attention of the soils engineer to determine whether changes in the provided recommendations are required. Deviations from noted subsurface conditions, if encountered during construction, should also be brought to the attention of the soils engineer. Project Description The proposed development is in the northwestern portion of the City of Meridian,Ada County,ID,and occupies portions of the S'/2 and NEl/4 of Section 28, Township 4 North, Range 1 West, Boise Meridian. This project will consist of construction of approximately 1,001 residential structures and two parks to be developed on approximately 253 acres. Total settlements are limited to 1 inch. Loads of up to 4,000 pounds per lineal foot for wall footings, and column loads of up to 50,000 pounds were assumed for settlement calculations. Additionally, assumptions have been made for traffic loading of pavements. Retaining walls are not anticipated as part of the project. MTI has not been informed of the proposed grading plan. Authorization Authorization to perform this exploration and analysis was given in the form of a written authorization to proceed from Mr. Jeff Harris and Mr. Thomas Coleman of Coleman Homes, A Toll Brothers Company to M. Bradley Tanberg of Materials Testing and Inspection (MTI), on 20 June 2018. Said authorization is subject to terms,conditions,and limitations described in the Professional Services Contract entered into between Coleman Homes, A Toll Brothers Company and MTI. Our scope of services for the proposed development has been provided in our proposal dated 26 April 2018 and repeated below. Purpose The purpose of this Geotechnical Engineering Report is to determine various soil profile components and their engineering characteristics for use by either design engineers or architects in: • Preparing or verifying suitability of foundation design and placement • Preparing site drainage designs • Indicating issues pertaining to earthwork construction • Preparing residential pavement section design requirements Scope of Investigation The scope of this investigation included review of geologic literature and existing available geotechnical studies of the area, visual site reconnaissance of the immediate site, subsurface exploration of the site, field and laboratory testing of materials collected, and engineering analysis and evaluation of foundation materials. The scope of work did not include design recommendations specific to individual residences. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page #4 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Warranty and Limiting Conditions MTI warrants that findings and conclusions contained herein have been formulated in accordance with generally accepted professional engineering practice in the fields of foundation engineering, soil mechanics, and engineering geology only for the site and project described in this report. These engineering methods have been developed to provide the client with information regarding apparent or potential engineering conditions relating to the site within the scope cited above and are necessarily limited to conditions observed at the time of the site visit and research. Field observations and research reported herein are considered sufficient in detail and scope to form a reasonable basis for the purposes cited above. Limitations Due to flood irrigation occurring in the western crop field and equipment access limitations into non-harvested fields, multiple test pits were not excavated. Some test pit locations were re-located to prevent disturbance of existing crops. Exclusive Use This report was prepared for exclusive use of the property owner(s), at the time of the report, and their retained design consultants ("Client"). Conclusions and recommendations presented in this report are based on the agreed-upon scope of work outlined in this report together with the Contract for Professional Services between the Client and Materials Testing and Inspection("Consultant"). Use or misuse of this report,or reliance upon findings hereof, by parties other than the Client is at their own risk. Neither Client nor Consultant make representation of warranty to such other parties as to accuracy or completeness of this report or suitability of its use by such other parties for purposes whatsoever, known or unknown, to Client or Consultant. Neither Client nor Consultant shall have liability to indemnify or hold harmless third parties for losses incurred by actual or purported use or misuse of this report. No other warranties are implied or expressed. Report Recommendations are Limited and Subiect to Misinterpretation There is a distinct possibility that conditions may exist that could not be identified within the scope of the investigation or that were not apparent during our site investigation. Findings of this report are limited to data collected from noted explorations advanced and do not account for unidentified fill zones, unsuitable soil types or conditions, and variability in soil moisture and groundwater conditions. To avoid possible misinterpretations of findings, conclusions, and implications of this report, MTI should be retained to explain the report contents to other design professionals as well as construction professionals. Since actual subsurface conditions on the site can only be verified by earthwork, note that construction recommendations are based on general assumptions from selective observations and selective field exploratory sampling. Upon commencement of construction, such conditions may be identified that require corrective actions, and these required corrective actions may impact the project budget. Therefore, construction recommendations in this report should be considered preliminary, and MTI should be retained to observe actual subsurface conditions during earthwork construction activities to provide additional construction recommendations as needed. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 5 of 51 INSPECTION b 180977g_geotech.docx ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Since geotechnical reports are subject to misinterpretation, do not separate the soil logs from the report. Rather, provide a copy of, or authorize for their use, the complete report to other design professionals or contractors. Locations of exploratory sites referenced within this report should be considered approximate locations only. For more accurate locations, services of a professional land surveyor are recommended. This report is also limited to information available at the time it was prepared. In the event additional information is provided to MTI following publication of our report, it will be forwarded to the client for evaluation in the form received. Environmental Concerns Comments in this report concerning either onsite conditions or observations, including soil appearances and odors, are provided as general information. These comments are not intended to describe, quantify, or evaluate environmental concerns or situations. Since personnel, skills, procedures, standards, and equipment differ, a geotechnical investigation report is not intended to substitute for a geoenvironmental investigation or a Phase IVIII Environmental Site Assessment. If environmental services are needed, MTI can provide, via a separate contract, those personnel who are trained to investigate and delineate soil and water contamination. SITE DESCRIPTION Site Access Access to the site may be gained via Interstate 84 to the Ten Mile Road exit. Proceed north on Ten Mile Road approximately 3.8 miles to its intersection with McMillan Road. From this intersection, proceed west on McMillan Road 2.0 miles to McDermott Road. The site occupies the northeast corner of this intersection. Presently the site exists as agricultural land and four residences with associated outbuildings fronting McDermott, McMillan, and Black Cat Roads. The location is depicted on site map plates included in the Appendix. Regional Geology The project site is located within the western Snake River Plain of southwestern Idaho and eastern Oregon. The plain is a northwest trending rift basin, about 45 miles wide and 200 miles long,that developed about 14 million years ago(Ma)and has since been occupied sporadically by large inland lakes. Geologic materials found within and along the plain's margins reflect volcanic and fluvial/lacustrine sedimentary processes that have led to an accumulation of approximately 1 to 2 km of interbedded volcanic and sedimentary deposits within the plain. Along the margins of the plain, streams that drained the highlands to the north and south provided coarse to fine-grained sediments eroded from granitic and volcanic rocks, respectively. About 2 million years ago the last of the lakes was drained and since that time fluvial erosion and deposition has dominated the evolution of the landscape. The project site is underlain by the "Gravel of Whitney Terrace" as mapped by Othberg and Stanford (1993). Sediments of the Whitney terrace consist of sandy pebble and cobble gravel. The Whitney terrace is the second terrace above modern Boise River floodplain, is thickest toward its eastern extent, and is mantled with 2-6 feet of loess. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 6 of 51 INSPECTION b 180977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections General Site Characteristics This proposed development consists of approximately 253 acres of relatively flat and level terrain. Throughout the majority of the site, surficial soils consist of lean clays. Vegetation primarily consists of agricultural crop, pasture-type grass, and other native grass varieties typical of and to semi-arid environments. However, some landscape trees,shrubs,and sod was observed surrounding the residences. The project site is bisected by several irrigation ditches that serve the existing agricultural fields. These ditches run primarily in the north-south or east-west directions, though in the northeastern portion of the site they tend to run along the boundaries or cut through the property in a northwest-southeast direction. Regional drainage is north and west toward the Boise River. Stormwater drainage for the site is achieved by percolation through surficial soils. The site is situated so that it is unlikely that it will receive any stormwater drainage from off-site sources. Stormwater drainage collection and retention systems are not in place on the project site and do not currently exist within the vicinity of the project site. However, stormwater drainage facilities will be constructed as part of the development. Regional Site Climatology and Geochemistry According to the Western Regional Climate Center, the average precipitation for the Treasure Valley is on the order of 10 to 12 inches per year, with an annual snowfall of approximately 20 inches and a range from 3 to 49 inches. The monthly mean daily temperatures range from 21°F to 95°F, with daily extremes ranging from - 25°F to 111°F. Winds are generally from the northwest or southeast with an annual average wind speed of approximately 9 miles per hour(mph)and a maximum of 62 mph. Soils and sediments in the area are primarily derived from siliceous materials and exhibit low electro-chemical potential for corrosion of metals or concretes. Local aggregates are generally appropriate for Portland cement and lime cement mixtures. Surface water, groundwater, and soils in the region typically have pH levels ranging from 7.2 to 8.2. SEISMIC SITE EVALUATION Geoseismic Setting Soils on site are classed as Site Class D in accordance with Chapter 20 of the American Society of Civil Engineers (ASCE)publication ASCE/SEI 7-10. Structures constructed on this site should be designed per IBC requirements for such a seismic classification. Our investigation did not reveal hazards resulting from potential earthquake motions including: slope instability, liquefaction, and surface rupture caused by faulting or lateral spreading. Incidence and anticipated acceleration of seismic activity in the area is low. Seismic Design Parameter Values The United States Geological Survey National Seismic Hazard Maps (2008), includes a peak ground acceleration map. The map for 2% probability of exceedance in 50 years in the Western United States in standard gravity(g) indicates that a peak ground acceleration of 0.198 is appropriate for the project site based on a Site Class D. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 7 of 51 INSPECTION b 1 80977g_geotech.docx ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections The following section provides an assessment of the earthquake-induced earthquake loads for the site, including identification of the earthquake spectral response acceleration for short periods, Stirs, and at 1-second period, Smi, adjusted for site class effects as required by the 2015 IBC based on the following equations: SAIW =FSs SM, =Fv S, Where: FQ= Site coefficient defined in Table 1613.3.3(1) in the 2015 IBC. F,= Site coefficient defined in Table 1613.3.3(2) in the 2015 IBC. SS=The mapped spectral accelerations for short periods. Sr =The mapped spectral accelerations for 1-second periods. The USGS National Seismic Hazards Mapping Project includes a program that provides values for ground motion at a selected site based on the same data that were used to prepare the USGS ground motion maps. The maps were developed using attenuation relationships for soft rock sites; the source model, assumptions, and empirical relationships used in preparation of the maps are described in Petersen and others (1996). The following values are based on a site specific Site Class of D. SS and Si =Mapped Spectral Acceleration Values Site Class D Fa= 1.567 Fv=2.389 Period (sec) S. (el 0.2 0.291 (Ss, Site Class D) 1.0 0.103 (S1, Site Class D) Sms= 0.456 Sail = 0.246 Design spectral response acceleration parameters as presented in the 2015 IBC are defined as a 5% damped design spectral response acceleration at short periods, SDs, and at 1-second period, SDI, as calculated from the following equations: SDs =3'stirs SDt =3 SMt For the proposed project site, the 5% damped design spectral response acceleration at short periods, as calculated using the program supplied by the USGS are as follows: SDs= 0.304 SDI = 0.164 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 8 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections SOILS EXPLORATION Exploration and Sampling Procedures Field exploration conducted to determine engineering characteristics of subsurface materials included a reconnaissance of the project site and investigation by test pit. Approximate test pit sites were preselected and agreed-upon by both MTI and Coleman Homes prior to field work being conducted. Actual test pit sites were located in the field by means of a Global Positioning System(GPS)device and are reportedly accurate to within sixteen feet. Upon completion of investigation,each test pit was backfilled with loose excavated materials. Re- excavation and compaction of these test pit areas are required prior to construction of overlying structures. In addition, samples were obtained from representative soil strata encountered. Samples obtained have been visually classified in the field by professional staff, identified according to test pit number and depth, placed in sealed containers, and transported to our laboratory for additional testing. Subsurface materials have been described in detail on logs provided in the Appendix. Results of field and laboratory tests are also presented in the Appendix. MTI recommends that these logs not be used to estimate fill material quantities. Laboratory Testing Program Along with our field investigation, a supplemental laboratory testing program was conducted to determine additional pertinent engineering characteristics of subsurface materials necessary in an analysis of anticipated behavior of the proposed structures. Laboratory tests were conducted in accordance with current applicable American Society for Testing and Materials (ASTM) and American Association of State Highway and Transportation Officials (AASHTO) specifications, and results of these tests are to be found on the accompanying logs located in the Appendix. The laboratory testing program for this report included: Atterberg Limits Testing—ASTM D4318, Grain Size Analysis—ASTM C 117/C 136, and Resistance Value (R-value)and Expansion Pressure of Compacted Soils—Idaho T-8. Soil and Sediment Profile The profile below represents a generalized interpretation for the project site. Note that on site soils strata, encountered between test pit locations, may vary from the individual soil profiles presented in the logs, which can be found in the Appendix. The materials encountered during exploration were quite typical for the geologic area mapped as Gravel of Whitney Terrace. Varying clay-sand-gravel fill mixtures were observed at ground surface in test pits 3, 9, 20, 21, and 24. These materials were generally light brown to dark brown or gray, dry to wet, and medium dense/soft to hard, with fine to coarse-grained sand and 6-inch-minus cobbles. Concrete and rebar debris were encountered within these materials. Lean clay soils were found beneath fill materials and at ground surface in the remaining test pits. These soils were brown to dark brown, dry to wet, and soft to hard. Plow zones were noted to depths of up to 1.4 feet bgs. Additionally, intermittent weak calcium carbonate cementation was observed within the lower portions of this horizon in some of the test pits. Sandy silt/silty sand soils were noted beneath the surficial lean clay soils. These silt-sand mixtures were found to be whitish-tan to dark brown, dry to wet, and stiff to hard/medium dense to very dense. Fine to coarse-grained sand, occasional fine gravel, and varying degrees of calcium carbonate cementation were noted throughout the sandy silt/silty sand soils. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 9 of 51 INSPECTION b 180977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Poorly graded sand with silt sediments were encountered beneath silt-sand soil mixtures in test pits 5, 6, 16, 19, and 20. These sediments were brown to gray or tan, slightly moist to wet, and medium dense to very dense, with fine to coarse-grained sand and 5-inch-minus cobbles. Poorly graded gravel with sand sediments were encountered at depth in the test pits. These sediments were gray to tan, slightly moist to saturated, and medium dense to very dense,with fine to coarse-grained sand and 14-inch-minus boulders. Varying degrees of sidewall caving were noted within this horizon. Competency of test pit sidewalls varied little across the site. In general, fine grained soils remained stable while more granular sediments readily sloughed. However, moisture contents will also affect wall competency with saturated soils having a tendency to readily slough when under load and unsupported. Volatile Organic Scan No environmental concerns were identified prior to commencement of the investigation. Therefore, soils obtained during on-site activities were not assessed for volatile organic compounds by portable photoionization detector. Samples obtained during our exploration activities exhibited no odors or discoloration typically associated with this type of contamination. Groundwater encountered did not exhibit obvious signs of contamination. SITE HYDROLOGY Existing surface drainage conditions are defined in the General Site Characteristics section. Information provided in this section is limited to observations made at the time of the investigation. Either regional or local ordinances may require information beyond the scope of this report. Groundwater During this field investigation, groundwater was encountered in test pits at depths ranging from 5.0 to 12.8 feet bgs. Groundwater appeared to be shallowest in the northeastern portion of the site. Soil moistures in the test pits were generally dry to slightly moist within surficial soils. Within the poorly graded gravels with sand, soil moistures graded from slightly moist to saturated as the water table was approached and penetrated. In the vicinity of the project site, groundwater levels are controlled in large part by agricultural and residential irrigation activity and leakage from nearby canals. Maximum groundwater elevations likely occur during the later portion of the irrigation season. During nine previous investigations performed throughout 2004 through 2017 within approximately 1/2-mile to the north, east, and south of the project site, groundwater was noted within numerous borings and test pits at depths ranging from 4.0 to 14.0 feet bgs. Long term groundwater monitoring conducted on several of these sites showed groundwater depths as shallow as 1.93 during the later portion of the irrigation season. In addition, groundwater swings of 4 to 7 feet were often noted throughout the year based on this groundwater monitoring data. Furthermore, according to United States Geological Survey (USGS) monitoring well data within approximately 1/2-mile of the project site, groundwater was measured at depths ranging between 2.8 and 14.0 feet bgs. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 10 of 51 INSPECTION b 1 80977g_geotech.docx ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Based on evidence of this investigation and background knowledge of the area, MTI estimates groundwater depths to remain greater than approximately 5 feet bgs throughout the year through the majority of the site. However, in select portions of the site, groundwater depths may be seen as shallow as 1 to 2 feet. Since this is an estimated depth and seasonal groundwater levels fluctuate, actual levels should be confirmed by periodic groundwater data collected from 15 piezometers installed on the site. See the Site Map included in the Appendix of this report for locations of the piezometers. Since groundwater levels on the site are influenced heavily by agricultural irrigation activities, it should be expected for groundwater levels to lower over time as the nearby agricultural properties are developed. The extent of this lowering of the water table is unknown. Soil Infiltration Rates Soil permeability,which is a measure of the ability of a soil to transmit a fluid,was not tested in the field. Given the absence of direct measurements, for this report an estimation of infiltration is presented using generally recognized values for each soil type and gradation. Of soils comprising the generalized soil profile for this study, lean clay soils generally offer little permeability, with typical hydraulic infiltration rates of less than 2 inches per hour. Sandy silt soils will commonly exhibit infiltration rates from 2 to 4 inches per hour and silty sand sediments generally display rates of 4 to 8 inches per hour; though calcium carbonate cementation may reduce these values to near zero. Poorly graded sand and gravel with sand sediments typically exhibit infiltration values in excess of 12 inches per hour. However, the presence of calcium carbonate cementation, which was encountered within most of the soil types on the site, may reduce infiltration rates to near zero. Ada County Highway District (ACHD) will require onsite percolation testing once the proposed locations of infiltration facilities are determined. The quantity of testing will be dependent on the size and number of infiltration facilities planned, and can be determined from Section 8000 of the ACHD Policy Manual. The estimated infiltration rates listed above are to be considered preliminary and are only provided to determine feasibility for onsite infiltration. FOUNDATION, SLAB,AND PAVEMENT DISCUSSION AND RECOMMENDATIONS Various foundation types have been considered for support of the proposed structures. Two requirements must be met in the design of foundations. First, the applied bearing stress must be less than the ultimate bearing capacity of foundation soils to maintain stability. Second, total and differential settlement must not exceed an amount that will produce an adverse behavior of the superstructure. Allowable settlement is usually exceeded before bearing capacity considerations become important; thus, allowable bearing pressure is normally controlled by settlement considerations. Considering subsurface conditions and the proposed construction, it is recommended that the structures be founded upon conventional spread footings and continuous wall footings. Total settlements should not exceed 1 inch if the following design and construction recommendations are observed. Presently, there are approximately 1,001 lots proposed for the project site. The following recommendations are not specific to the individual structures, but rather should be viewed as guidelines for the subdivision—wide development. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 11 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Foundation Design Recommendations Based on data obtained from the site and test results from various laboratory tests performed,MTI recommends the following guidelines for the net allowable soil bearing capacity: Soil Bearing Capacity Footing Depth AL ASTM D1557 Net Allowable Sub rade Compaction Soil Bearing Capacity Footings must bear on competent,undisturbed,native 1,500 lbs/ft2 lean clay soils, sandy silt soils, silty sand sediments, Not Required for , or compacted structural fill. Existing plow zones and Native Soil A /3 increase is allowable fill materials must be completely removed from for short-term loading, below foundation elements.I Excavation depths 95/o o f St which is defined by ranging from roughly 0.4 to 3.2 feet bgs should be or Structural Fill seismic events or designed anticipated to expose proper bearing soils.21 1 wind speeds. 'It will be required for MTI personnel to verify the bearing soil suitability for each structure at the time of construction. 2Depending on the time of year construction takes place, the subgrade soils may be unstable because of high moisture contents. If unstable conditions are encountered,over-excavation and replacement with granular structural fill and/or use of geotextiles may be required. Footings should be proportioned to meet either the stated soil bearing capacity or the 2015 IBC minimum requirements. Total settlement should be limited to approximately I inch, and differential settlement should be limited to approximately % inch. Objectionable soil types encountered at the bottom of footing excavations should be removed and replaced with structural fill. Excessively loose or soft areas that are encountered in the footings subgrade will require over-excavation and backfilling with structural fill. To minimize the effects of slight differential movement that may occur because of variations in the character of supporting soils and seasonal moisture content, MTI recommends continuous footings be suitably reinforced to make them as rigid as possible. For frost protection, the bottom of external footings should be 24 inches below finished grade. Crawl Space Recommendations Considering the presence of shallow clayey soils and/or groundwater across the site, all residences constructed with crawl spaces should be designed in a manner that will inhibit water in the crawl spaces. Bottom of crawl spaces must be elevated at least 2 feet above seasonal high groundwater elevation. MTI recommends that roof drains carry stormwater at least 10 feet away from each residence. Grades should be at least 5 percent for a distance of 10 feet away from all residences. In addition, rain gutters should be placed around all sides of residences, and backfill around stem walls should be placed and compacted in a controlled manner. Floor, Patio, and Garage Slab-on-Grade Uncontrolled fill, which contained debris, and plow zones (which should be treated as fill materials) were encountered in portions of the site. MTI recommends that these fill materials be excavated to a sufficient depth to expose competent, native soils or to a minimum depth of 1'/2 feet below existing grade. If fill materials remain after over-excavation, the exposed subgrade must be compacted to at least 95 percent of the maximum dry density as determined by ASTM D 1557. MTI personnel must be present during excavation to identify these materials. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 12 of 51 INSPECTION b 1 80977g_geotech.docx ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Organic, loose, or obviously compressive materials must be removed prior to placement of concrete floors or floor-supporting fill. In addition, the remaining subgrade should be treated in accordance with guidelines presented in the Earthwork section. Areas of excessive yielding should be excavated and backfilled with structural fill. Fill used to increase the elevation of the floor slab should meet requirements detailed in the Structural Fill section. Fill materials must be compacted to a minimum 95 percent of the maximum dry density as determined by ASTM D 1557. A free-draining granular mat(drainage fill course) should be provided below slabs-on-grade. This should be a minimum of 4 inches in thickness and properly compacted. The mat should consist of a sand and gravel mixture, complying with Idaho Standards for Public Works Construction (ISPWC) specifications for 3/4-inch (Type 1) crushed aggregate. The granular mat should be compacted to no less than 95 percent of the maximum dry density as determined by ASTM D 1557. A moisture-retarder should be placed beneath floor slabs to minimize potential ground moisture effects on moisture-sensitive floor coverings. The moisture-retarder should be at least 15-mil in thickness and have a permeance of less than 0.01 US perms as determined by ASTM E96. Placement of the moisture-retarder will require special consideration with regard to effects on the slab-on-grade and should adhere to recommendations outlined in the ACI 302.1 R and ASTM E 1745 publications. Upon request, MTI can provide further consultation regarding installation. Recommended Pavement Section As required by Ada County Highway District (ACHD), MTI has used a traffic index of 6 to determine the necessary pavement cross-section for the site. MTI has made assumptions for traffic loading variables based on the character of the proposed construction. The Client should review these assumptions to make sure they reflect intended use and loading of pavements both now and in the future. MTI collected three samples of near- surface soils for Resistance Value (R-value) testing representative of soils to depths of 3.5 feet below existing ground surface. These samples, consisting of lean clay collected from test pits 11, 14, and 20, yielded R-values of 6, 15, and less than 5, respectively. For design, MTI elected to use an R-value of 5, which is considered representative of the overall subdivision. The following are minimum thickness requirements for assured pavement function. Depending on site conditions, additional work, e.g. soil preparation, may be required to support construction equipment. These have been listed within the Soft Subgrade Soils section. Results of the test are graphically depicted in the Appendix. Flexible Pavement Section The Gravel Equivalent Method, as defined in Section 500 of the State of Idaho Department of Transportation (ITD) Materials Manual, was used to develop the pavement section. ACHD parameters for traffic index and substitution ratios, which were obtained from the ACHD Policy Manual, were also used in the design. A calculation sheet provided in the Appendix indicates the soils constant, traffic loading, traffic projections, and material constants used to calculate the pavement section. MTI recommends that materials used in the construction of asphaltic concrete pavements meet the requirements of the ISPWC Standard Specification for Highway Construction. Construction of the pavement section should be in accordance with these specifications and should adhere to guidelines recommended in the section on Construction Considerations. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 13 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Gravel Equivalent Method Flexible Pavement Specifications Pavement Section Component' Roadway Section Asphaltic Concrete 2.5 Inches Crushed Aggregate Base 4.0 Inches Structural Subbase 14.0 Inches Compacted Subgrade See Pavement Subgrade Preparation Section 'It will be required for MTI personnel to verify subgrade competency at the time of construction. Asphaltic Concrete: Asphalt mix design shall meet the requirements of ISPWC, Section 810 Class III plant mix. Materials shall be placed in accordance with ISPWC Standard Specifications for Highway Construction. Aggregate Base: Material complying with ISPWC Standards for Crushed Aggregate Materials. Structural Subbase: Material complying with requirements for granular structural fill (uncrushed) as defined in ISPWC. Pavement Subgrade Preparation Uncontrolled fill,which contained debris, and plow zones (which should be treated as fill)were encountered in portions of the site. MTI recommends that these fill materials be excavated to a sufficient depth to expose competent, native soils or to a minimum depth of 11/z feet below existing grade. If fill materials remain after over-excavation, the exposed subgrade must be compacted to at least 95 percent of the maximum dry density as determined by ASTM D698. MTI personnel must be present during excavation to identify these materials. Common Pavement Section Construction Issues The subgrade upon which above pavement sections are to be constructed must be properly stripped, compacted (if indicated),inspected, and proof-rolled. Proof rolling of subgrade soils should be accomplished using a heavy rubber-tired, fully loaded,tandem-axle dump truck or equivalent. Verification of subgrade competence by MTI personnel at the time of construction is required. Fill materials on the site must demonstrate the indicated compaction prior to placing material in support of the pavement section. MTI anticipated that pavement areas will be subjected to moderate traffic. Subgrade clays and silts near and above optimum moisture contents may pump during compaction. Pumping or soft areas must be removed and replaced with structural fill. Fill material and aggregates in support of the pavement section must be compacted to no less than 95 percent of the maximum dry density as determined by ASTM D698 for flexible pavements and by ASTM D 1557 for rigid pavements. If a material placed as a pavement section component cannot be tested by usual compaction testing methods, then compaction of that material must be approved by observed proof rolling. Minor deflections from proof rolling for flexible pavements are allowable. Deflections from proof rolling of rigid pavement support courses should not be visually detectable. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 14 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections CONSTRUCTION CONSIDERATIONS Recommendations in this report are based upon structural elements of the project being founded on competent, undisturbed,native lean clay soils, sandy silt soils, silty sand sediments, or compacted structural fill. Structural areas should be stripped to an elevation that exposes these soil types. Earthwork Excessively organic soils,deleterious materials,or disturbed soils generally undergo high volume changes when subjected to loads, which is detrimental to subgrade behavior in the area of pavements, floor slabs, structural fills, and foundations. Mature trees, brush, and thick grasses with associated root systems were noted at the time of our investigation. It is recommended that organic or disturbed soils, if encountered, be removed to depths of I foot (minimum), and wasted or stockpiled for later use. However, in areas where trees are/were present, deeper excavation depths should be anticipated. Stripping depths should be adjusted in the field to assure that the entire root zone or disturbed zone (plow depths) or topsoil are removed prior to placement and compaction of structural fill materials. Exact removal depths should be determined during grading operations by MTI personnel, and should be based upon subgrade soil type, composition, and firmness or soil stability. If underground storage tanks,underground utilities,wells, or septic systems are discovered during construction activities, they must be decommissioned then removed or abandoned in accordance with governing Federal, State,and local agencies. Excavations developed as the result of such removal must be backfilled with structural fill materials as defined in the Structural Fill section. MTI should oversee subgrade conditions (i.e., moisture content) as well as placement and compaction of new fill (if required) after native soils are excavated to design grade. Recommendations for structural fill presented in this report can be used to minimize volume changes and differential settlements that are detrimental to the behavior of footings, pavements, and floor slabs. Sufficient density tests should be performed to properly monitor compaction. For structural fill beneath building structures, one in-place density test per lift for every 5,000 square feet is recommended. In parking and driveway areas, this can be decreased to one test per lift for every 10,000 square feet. Dry Weather If construction is to be conducted during dry seasonal conditions,many problems associated with soft soils may be avoided. However,some rutting of subgrade soils may be induced by shallow groundwater conditions related to springtime runoff or irrigation activities during late summer through early fall. Solutions to problems associated with soft subgrade soils are outlined in the Soft Subgrade Soils section. Problems may also arise because of lack of moisture in native and fill soils at time of placement. This will require the addition of water to achieve near-optimum moisture levels. Low-cohesion soils exposed in excavations may become friable, increasing chances of sloughing or caving. Measures to control excessive dust should be considered as part of the overall health and safety management plan. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 15 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Wet Weather If construction is to be conducted during wet seasonal conditions (commonly from mid-November through May),problems associated with soft soils must be considered as part of the construction plan. During this time of year, fine-grained soils such as silts and clays will become unstable with increased moisture content, and eventually deform or rut. Additionally, constant low temperatures reduce the possibility of drying soils to near optimum conditions. Soft Subgrade Soils Shallow fine-grained subgrade soils that are high in moisture content should be expected to pump and rut under construction traffic. During periods of wet weather, construction may become very difficult if not impossible. The following recommendations and options have been included for dealing with soft subgrade conditions: • Track-mounted vehicles should be used to strip the subgrade of root matter and other deleterious debris. Heavy rubber-tired equipment should be prohibited from operating directly on the native subgrade and areas in which structural fill materials have been placed. Construction traffic should be restricted to designated roadways that do not cross, or cross on a limited basis,proposed roadway or parking areas. • Soft areas can be over-excavated and replaced with granular structural fill. • Construction roadways on soft subgrade soils should consist of a minimum 2-foot thickness of large cobbles of 4 to 6 inches in diameter with sufficient sand and fines to fill voids. Construction entrances should consist of a 6-inch thickness of clean, 2-inch minimum, angular drain-rock and must be a minimum of 10 feet wide and 30 to 50 feet long. During the construction process, top dressing of the entrance may be required for maintenance. • Scarification and aeration of subgrade soils can be employed to reduce the moisture content of wet subgrade soils. After stripping is complete, the exposed subgrade should be ripped or disked to a depth of 11/z feet and allowed to air dry for 2 to 4 weeks. Further disking should be performed on a weekly basis to aid the aeration process. • Alternative soil stabilization methods include use of geotextiles, lime, and cement stabilization. MTI is available to provide recommendations and guidelines at your request. Frozen Subgrade Soils Prior to placement of structural fill materials or foundation elements, frozen subgrade soils must either be allowed to thaw or be stripped to depths that expose non-frozen soils and wasted or stockpiled for later use. Stockpiled materials must be allowed to thaw and return to near-optimal conditions prior to use as structural fill. The onsite, shallow clayey and silty soils are susceptible to frost heave during freezing temperatures. For exterior flatwork and other structural elements, adequate drainage away from subgrades is critical. Compaction and use of structural fill will also help to mitigate the potential for frost heave. Complete removal of frost susceptible soils for the full frost depth, followed by replacement with a non-frost susceptible structural fill, can also be used to mitigate the potential for frost heave. MTI is available to provide further guidance/assistance upon request. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 16 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Structural Fill Soils recommended for use as structural fill are those classified as GW, GP, SW, and SP in accordance with the Unified Soil Classification System(USCS) (ASTM D2487). Use of silty soils (USCS designation of GM, SM, and ML) as structural fill may be acceptable. However, use of silty soils (GM, SM, and ML) as structural fill below footings is prohibited. These materials require very high moisture contents for compaction and require a long time to dry out if natural moisture contents are too high and may also be susceptible to frost heave under certain conditions. Therefore, these materials can be quite difficult to work with as moisture content, lift thickness, and compactive effort becomes difficult to control. If silty soil is used for structural fill, lift thicknesses should not exceed 6 inches (loose), and fill material moisture must be closely monitored at both the working elevation and the elevations of materials already placed. Following placement, silty soils must be protected from degradation resulting from construction traffic or subsequent construction. Recommended granular structural fill materials, those classified as GW, GP, SW, and SP, should consist of a 6-inch minus select, clean, granular soil with no more than 50 percent oversize (greater than 3/4-inch) material and no more than 12 percent fines (passing No. 200 sieve). These fill materials should be placed in layers not to exceed 12 inches in loose thickness. Prior to placement of structural fill materials, surfaces must be prepared as outlined in the Construction Considerations section. Structural fill material should be moisture-conditioned to achieve optimum moisture content prior to compaction. For structural fill below footings,areas of compacted backfill must extend outside the perimeter of the footings for a distance equal to the thickness of fill between the bottom of foundation and underlying soils, or 5 feet,whichever is less. All fill materials must be monitored during placement and tested to confirm compaction requirements, outlined below, have been achieved. Each layer of structural fill must be compacted, as outlined below: • Below Structures and Rigid Pavements: A minimum of 95 percent of the maximum dry density as determined by ASTM D 1557. • Below Flexible Pavements: A minimum of 92 percent of the maximum dry density as determined by ASTM D 1557 or 95 percent of the maximum dry density as determined by ASTM D698. The ASTM D 1557 test method must be used for samples containing up to 40 percent oversize (greater than 3/4- inch)particles. If material contains more than 40 percent but less than 50 percent oversize particles,compaction of fill must be confirmed by proof rolling each lift with a 10-ton vibratory roller (or equivalent) until the maximum density has been achieved. Density testing must be performed after each proof rolling pass until the in-place density test results indicate a drop (or no increase) in the dry density, defined as maximum density or "break over"point. The number of required passes should be used as the requirements on the remainder of fill placement. Material should contain sufficient fines to fill void spaces, and must not contain more than 50 percent oversize particles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 17 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Backfill of Walls Backfill materials must conform to the requirements of structural fill, as defined in this report. For wall heights greater than 2.5 feet, the maximum material size should not exceed 4 inches in diameter. Placing oversized material against rigid surfaces interferes with proper compaction,and can induce excessive point loads on walls. Backfill shall not commence until the wall has gained sufficient strength to resist placement and compaction forces. Further, retaining walls above 2.5 feet in height shall be backfilled in a manner that will limit the potential for damage from compaction methods and/or equipment. It is recommended that only small hand- operated compaction equipment be used for compaction of backfill within a horizontal distance equal to the height of the wall, measured from the back face of the wall. Backfill should be compacted in accordance with the specifications for structural fill, except in those areas where it is determined that future settlement is not a concern, such as planter areas. In nonstructural areas, backfill must be compacted to a firm and unyielding condition. Excavations Shallow excavations that do not exceed 4 feet in depth maybe constructed with side slopes approaching vertical. Below this depth, it is recommended that slopes be constructed in accordance with Occupational Safety and Health Administration(OSHA) regulations, Section 1926, Subpart P. Based on these regulations, on-site soils are classified as type "C" soil, and as such, excavations within these soils should be constructed at a maximum slope of 1'/2 feet horizontal to I foot vertical (11/2:1) for excavations up to 20 feet in height. Excavations in excess of 20 feet will require additional analysis. Note that these slope angles are considered stable for short- term conditions only, and will not be stable for long-term conditions. During the subsurface exploration, test pit sidewalls generally exhibited little indication of collapse; however, sloughing of fill materials and native granular sediments from test pit sidewalls was observed,particularly after penetration of the water table. For deep excavations, native granular sediments cannot be expected to remain in position. These materials are prone to failure and may collapse,thereby undermining upper soil layers. This is especially true when excavations approach depths near the water table. Care must be taken to ensure that excavations are properly backfilled in accordance with procedures outlined in this report. Groundwater Control Groundwater was encountered during the investigation, but is anticipated to be below the depth of most construction. Excavations below the water table will require a dewatering program. It may be possible to discharge dewatering effluent to remote portions of the site, to a sump, or to a pit. This will essentially recycle effluent,thus eliminating the need to enter into agreements with local drainage authorities. Should the scope of the proposed project change, MTI should be contacted to provide more detailed groundwater control measures. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 18 of 51 INSPECTION b 1 80977g_geotech.docx ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Special precautions may be required for control of surface runoff and subsurface seepage. It is recommended that runoff be directed away from open excavations. Silty and clayey soils may become soft and pump if subjected to excessive traffic during time of surface runoff. Ponded water in construction areas should be drained through methods such as trenching, sloping,crowning grades,nightly smooth drum rolling,or installing a French drain system. Additionally, temporary or permanent driveway sections should be constructed if extended wet weather is forecasted. GENERAL COMMENTS Based on the subsurface conditions encountered during this investigation and available information regarding the proposed development,the site is adequate for the planned construction. When plans and specifications are complete,and if significant changes are made in the character or location of the proposed structure,consultation with MTI must be arranged as supplementary recommendations may be required. Suitability of subgrade soils and compaction of structural fill materials must be verified by MTI personnel prior to placement of structural elements. Additionally, monitoring and testing should be performed to verify that suitable materials are used for structural fill and that proper placement and compaction techniques are utilized. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 19 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections REFERENCES Ada County Highway District (ACHD) (2017). Ada County Highway District Policy Manual (August 2017). [Online] Available: <http://www.achdidaho.org/AboutACHD/PolicyManual.aspx>(2018). American Concrete Institute(ACI)(2015).Guide for Concrete Floor and Slab Construction:ACI 302.1R.Farmington Hills,ME ACI. American Society of Civil Engineers(ASCE) (2013). Minimum Design Loads for Buildings and Other Structures: ASCE/SEI 7-10. Reston,VA: ASCE. American Society for Testing and Materials(ASTM)(2013). Standard Test Method for Materials Finer than 75-µm(No.200) Sieve in Mineral Aggregates by Washing:ASTM C117.West Conshohocken,PA: ASTM. American Society for Testing and Materials(ASTM)(2014).Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates: ASTM C136.West Conshohocken,PA:ASTM. American Society for Testing and Materials(ASTM) (2012). Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort:ASTM D698.West Conshohocken,PA:ASTM. American Society for Testing and Materials (ASTM) (2012). Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort:ASTM D1557.West Conshohocken,PA: ASTM. American Society for Testing and Materials(ASTM)(2013). Standard Test Methods for Resistance Value(R-Value)and Expansion Pressure of Compacted Soils:ASTM D2844.West Conshohocken,PA:ASTM. American Society for Testing and Materials(ASTM)(2011). Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System): ASTM D2487.West Conshohocken,PA: ASTM. American Society for Testing and Materials (ASTM) (2010). Standard Test Methods for Liquid Limit,Plastic Limit, and Plasticity Index of Soils:ASTM D4318.West Conshohocken,PA:ASTM. American Society for Testing and Materials (ASTM) (2011). Standard Specification for Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill Under Concrete Slabs:ASTM E1745.West Conshohocken,PA:ASTM. Desert Research Institute.Western Regional Climate Center. [Online] Available:<http://www.wrcc.dri.edu/>(2018). International Building Code Council(2015). International Building Code,2015.Country Club Hills,IL:Author. Local Highway Technical Assistance Council (LHTAC) (2017). Idaho Standards for Public Works Construction, 2017. Boise, ID: Author. Othberg,K.L. and Stanford,L.A.,Idaho Geologic Society(1992). Geologic Map of the Boise Valley and Adjoining Area,Western Snake River Plain,Idaho.(scale 1:100,000).Boise,ID:Joslyn and Morris. U.S. Department of Labor, Occupational Safety and Health Administration. CFR 29, Part 1926, Subpart P: Safety and Health Regulations for Construction,Excavations(1986). [Online]Available: <www.osha.gov>(2018). U.S. Geological Survey (2018). National Water Information System: Web Interface. [Online] Available: <http://waterdata.usgs.gov/nwis>(2018). U.S. Geological Survey. (2011). U.S. Seismic Design Maps: Web Interface. [Online] Available: <https:Hearthquake.usgs.gov/designmaps/us/application.php>(2018). 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#20 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections APPENDICES ACRONYM LIST AASHTO: American Association of State Highway and Transportation Officials ACHD: Ada County Highway District ACI American Concrete Institute ASCE American Society of Civil Engineers ASTM: American Society for Testing and Materials bgs: below ground surface CBR: California Bearing Ratio D: natural dry unit weight,pcf ESAL Equivalent Single Axle Load GS: grab sample IBC: International Building Code IDEQ Idaho Department of Environmental Quality ISPWC: Idaho Standards for Public Works Construction ITD: Idaho Transportation Department LL: Liquid Limit M: water content MSL: mean sea level N: Standard"N"penetration: blows per foot, Standard Penetration Test NP: nonplastic OSHA Occupational Safety and Health Administration PCCP: Portland Cement Concrete Pavement PERM: vapor permeability PI: Plasticity Index PID: photoionization detector PVC: polyvinyl chloride QC: cone penetrometer value,unconfined compressive strength,psi Qp: Penetrometer value,unconfined compressive strength,tsf Qu: Unconfined compressive strength,tsf RMR Rock Mass Rating RQD Rock Quality Designation R-Value Resistance Value SPT: Standard Penetration Test(140:pound hammer falling 30 in. on a 2:in. split spoon) USCS: Unified Soil Classification System USDA: United States Department of Agriculture UST: underground storage tank V: vane value,ultimate shearing strength,tsf 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#21 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL GENERAL NOTES RELATIVE DENSITY AND CONSISTENCY CLASSIFICATION Coarse-Grained Soils SPT Blow Counts(N) Fine-Grained Soils SPT Blow Counts(N) Very Loose: <4 Very Soft: <2 Loose: 4-10 Soft: 2-4 Medium Dense: 10-30 Medium Stiff: 4-8 Dense: 30-50 Stiff: 8-15 Very Dense: >50 Very Stiff: 15-30 Hard: >30 Moisture Content Cementation Description Field Test Description Field Test Dry Absence of moisture,dusty,dry to touch Weakly Crumbles or breaks with handling or slight finger pressure Moist Damp but not visible moisture Moderately Crumbles or beaks with considerable finger pressure Wet Visible free water,usually soil is below Strongly Will not crumble or break with finger water table g pressure or PARTICLE SIZE Boulders: >12 in. Coarse-Grained Sand: 5 to 0.6 mm Silts: 0.075 to 0.005 mm m m Cobbles: 12 to 3 in. Medium-Grained Sand: 0.6 to 0.2 mm Clays: <0.005 m Gravel: 3 in.to 5 m Fine-Grained Sand: 0.2 to 0.075 mm IF UNIFIED SOIL CLASSIFICATION SYSTEM Major Divisions Symbol Soil Descriptions Gravel&Gravelly GW Well-graded gravels;gravel/sand mixtures with little or no fines Soils GP Poorly-graded gravels;gravel/sand mixtures with little or no fines Coarse-Grained <50% coarse fraction GM Silty gravels;poorly-graded gravel/sand/silt mixtures Soils passes No.4 sieve GC Clayey gravels;poorly-graded gravel/sand/clay mixtures <50% passes No.200 Sand&Sandy SW Well-graded sands;gravelly sands with little or no fines sieve Soils SP Poorly-graded sands;gravelly sands with little or no fines >50% coarse fraction SM Silty sands;poorly-graded sand/gravel/silt mixtures passes No.4 sieve SC Clayey sands;poorly-graded sand/gravel/clay mixtures ML Inorganic silts; sandy,gravelly or clayey silts Silts&Clays CL Lean clays;inorganic,gravelly,sandy,or silty,low to medium-plasticity clays Fine Grained LL<50 Soils>50% OL Organic,low-plasticity clays and silts passes No.200 MH Inorganic,elastic silts; sandy,gravelly or clayey elastic silts sieve Silts&Clays LL>50 CH Fat clays;high-plasticity,inorganic clays OH Organic,medium to high-plasticity clays and silts Highly Organic Soils PT Peat,humus,hydric soils with high organic content 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#22 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-1 Date Advanced: 28 Mar 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65038 Longitude: -116.46949 Depth to Water Table: 11.7 Feet bgs Total Depth: 12.0 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-4.1 Lean Clay (CL): Dark brown, slightly moist 0.5-0.75 to moist, soft to medium stiff. Sandy Silt (ML): Whitish-tan to dark brown, dry to slightly moist, stiff to hard, with fine- 4.1-7.2 grained sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, moist to saturated, medium dense to 7.2-12.0 dense, with fine to coarse-grained sand and 6-inch-minus cobbles. --Moderate to heavy sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#23 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-2 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65206 Longitude: -116.47332 Depth to Water Table: 10.34 Feet bgs Total Depth: 13.6 Feet bgs Notes: Piezometer installed to 13.6 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, slightly moist 0.0-4.1 to moist, stiff to very stiff. 1.5-2.25 --Plow zone noted to a depth of 0.4 foot bgs. Sandy Silt (ML): Tan, dry to slightly moist, 4.1-6.8 very stiff to hard, with fine-grained sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, medium dense to dense, with fine to coarse-grained 6.8-13.6 sand and 7-inch-minus cobbles. GS 8.5-9.0 A --Intermittent 6 to 8-inch thick sand lenses throughout. --Moderate to heavy sidewall caving noted throughout. Lab Test ID M LL PI A 4.4 NP NP Lab Sieve Analysis (% passing) Test ID - 11/4" 3/4" #4 #10 #40 #100 #200 A 77 59 38 33 18 7 5.1 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#24 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-3 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65209 Longitude: -116.46838 Depth to Water Table: 10.31 Feet bgs Total Depth: 13.9 Feet bgs Notes: Piezometer installed to 13.9 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Poorly Graded Gravel with Clay and Sand Fill (GP-GC-FILL): Brown to gray, dry to 0.0-1.2 slightly moist, medium dense, with fine to coarse-grained sand and 3-inch-minus gravel. 1.2-6.3 Lean Clay (CL): Dark brown, slightly moist to moist, medium stiff to stiff. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, dense to very dense, with fine to coarse-grained sand 6.3-13.9 and 5-inch-minus cobbles. --Weak calcium carbonate cementation noted from 6.3 to 6.8 feet bgs. --Moderate sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#25 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-4 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65215 Longitude: -116.46626 Depth to Water Table: 12.8 Feet bgs Total Depth: 13.0 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, slightly moist 0.0-3.6 to moist, soft to very stiff. 0.5-2.25 --Plow zone noted to a depth of 0.4 foot bgs. Silty Sand (SM): Whitish-tan, dry to moist, medium dense to very dense, with fine- 3.6-6.8 grained sand. GS 4.0-4.3 B --Intermittent weak calcium carbonate cementation noted from 5.5 to 6.8 feet bgs. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, medium dense to dense, with fine to coarse-grained 6.8-13.0 sand and 5-inch-minus cobbles. --Intermittent 14-inch-minus boulders noted below 10.0 feet bgs. --Moderate to heavy sidewall caving noted throughout. Lab Test ID M LL PI Sieve Analysis (% passing) % - - nW44 1 #10 #40 #100 #200 B 42.4 NP NP 99 99 74 60 48.1 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#26 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-5 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.652001 Longitude: -116.463531 Depth to Water Table: 10.82 Feet bgs Total Depth: 13.6 Feet bgs Notes: Piezometer installed to 13.6 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry, stiff to 0.0-2.1 very stiff. --Plow zone noted to a depth of 0.4 foot bgs. Sandy Silt (ML): Whitish-tan, slightly moist to moist, very stiff to hard, with fine-grained 2.1-7.7 sand. --Intermittent weak calcium carbonate cementation noted from 4.8 to 7.7 feet bgs. Poorly Graded Sand with Silt and Gravel 7 7-8 2 (SP-SM): Brown, slightly moist to moist, medium dense, with fine to medium-grained sand and fine to coarse gravel. Poorly Graded Gravel with Sand (GP): Gray to tan, moist to saturated, dense to very 8.2-13.6 dense, with fine to coarse-grained sand and 10-inch-minus cobbles. --Light to moderate sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#27 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-6 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65214 Longitude: -116.46216 Depth to Water Table: 12.5 Feet bgs Total Depth: 12.9 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-3.7 Lean Clay (CL): Dark brown, dry to slightly 1.25-2.5 moist, stiff to very stiff. 3.7-7.1 Sandy Silt (ML): Whitish-tan, slightly moist to moist, stiff to hard, with fine-grained sand. Poorly Graded Sand with Silt and Gravel (SP-SM): Brown to gray, slightly moist to 7.1-9.9 moist, dense to very dense, with fine to coarse-grained sand and 5-inch-minus cobbles. Poorly Graded Gravel with Sand (GP): Gray to tan, moist to saturated, dense to very 9.9-12.9 dense, with fine to coarse-grained sand and 6-inch-minus cobbles. --Light sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#28 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-7 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65215 Longitude: -116.46116 Depth to Water Table: 10.50 Feet bgs Total Depth: 12.1 Feet bgs Notes: Piezometer installed to 12.1 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-4.3 Lean Clay (CL): Dark brown, dry to slightly moist, stiff to very stiff. Sandy Silt (ML): Whitish-tan, slightly moist to moist, very stiff to hard, with fine-grained 4.3-7.7 sand. --Intermittent weak calcium carbonate cementation noted from 5.3 to 7.7 feet bgs. Poorly Graded Gravel with Sand (GP): Gray to tan, moist to saturated, dense to very 7.7-12.1 dense, with fine to coarse-grained sand and 8-inch-minus cobbles. --Light sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#29 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-8 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65215 Longitude: -116.46024 Depth to Water Table: 10.2 Feet bgs Total Depth: 11.1 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-3.4 Lean Clay (CL): Dark brown, slightly moist 3.0-3.5 to moist, very stiff. Silty Sand (SM): Whitish-tan, slightly moist to moist, medium dense to very dense, with 3.4-6.1 fine to medium-grained sand. --Intermittent weak to moderate calcium carbonate cementation noted from 4.8 to 6.1 feet bgs. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 6.1-11.1 with fine to coarse-grained sand and 6-inch- minus cobbles. --Light sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 30 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-9 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65202 Longitude: -116.45858 Depth to Water Table: 9.10 Feet bgs Total Depth: 11.9 Feet bgs Notes: Piezometer installed to 11.9 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay Fill (CL-FILL): Dark brown, dry 0.0-2.5 to slightly moist, stiff. --24 to 30-inch diameter concrete rubble noted throughout. 2.5-4.5 Lean Clay (CL): Dark brown, slightly moist, medium stiff to stiff. Silty Sand (SM): Whitish-tan, slightly moist, dense to very dense, with fine to medium- 4.5-6.3 grained sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 6.3-11.9 with fine to coarse-grained sand and 6-inch- minus cobbles. --Moderate sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 31 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-10 Date Advanced: 28 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65023 Longitude: -116.45851 Depth to Water Table: 9.10 Feet bgs Total Depth: 12.8 Feet bgs Notes: Piezometer installed to 12.8 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-4.5 Lean Clay (CL): Dark brown, slightly moist, stiff to very stzff. Silty Sand (SM): Whitish-tan, slightly moist, very dense, with fine to medium-grained 4.5-7.1 sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, dense to 7.1-12.8 very dense, with fine to coarse-grained sand and 8-inch-minus cobbles. --Moderate to heavy sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 32 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-11 Date Advanced: 29 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.64884 Longitude: -116.45857 Depth to Water Table: 8.19 Feet bgs Total Depth: 12.0 Feet bgs Notes: Piezometer installed to 12.0 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, slightly moist, Bulk 1 R-value 0.0-4.3 stiff to very stiff. GS .0-1.5 C Silty Sand (SM): Whitish-tan, slightly moist, very dense to dense, with fine to medium- 4.3-6.2 grained sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 7.1-12.0 with fine to coarse-grained sand and 5-inch- minus cobbles. --Moderate sidewall caving noted throughout. Lab Test ID M LL PI Sieve Analysis % passing) % #4 #10 #40 #100 #200 0. 35 00 00 98C 95 90.5 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 33 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-12 Date Advanced: 29 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.64867 Longitude: -116.46127 Depth to Water Table: 9.63 Feet bgs Total Depth: 11.4 Feet bgs Notes: Piezometer installed to 11.4 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-4.8 Lean Clay (CL): Dark brown, slightly moist, stiff to very stiff. Silty Sand(SM): Tan, slightly moist to moist, dense to very dense, with fine to coarse- 4 8-8 7 grained sand and some fine gravel. GS 4.8-5.2 D --Intermittent weak calcium carbonate cementation noted throughout. --Moderate caving noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 8.7-11.4 with fine to coarse-grained sand and 5-inch- minus cobbles. --Light sidewall caving noted throughout. Lab Test ID M LL PI I Sieve Analysis % passing) % - - #4 #10 #40 #100 #200 D 10.1 NP NP 97 97 45 22 18.1 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 34 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-13 Date Advanced: 29 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65003 Longitude: -116.46053 Depth to Water Table: 8.88 Feet bgs Total Depth: 11.3 Feet bgs Notes: Piezometer installed to 11.3 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly moist, stiff to very stiff. 0.0-5.8 --Plow zone noted to 0.8 foot bgs. 2.0-2.5 --Intermittent weak calcium carbonate cementation from 3.9 to 5.8 feet bgs. Sandy Silt (ML): Tan to light brown, dry to slightly moist, very stiff to hard, with fine to 5.8-8.7 medium-grained sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand(GP): Gray to tan, moist to saturated, very dense, with 8.7-11.3 fine to coarse-grained sand and 4-inch-minus cobbles. --Light sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 35 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-14 Date Advanced: 29 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65048 Longitude: -116.46339 Depth to Water Table: 8.88 Feet bgs Total Depth: 11.3 Feet bgs Notes: Piezometer installed to 11.3 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, slightly moist 0.0-3.1 to moist, stiff to very stiff. Bulk 1.0-1.5 1.25-2.5 R-value --Plow zone noted to 1.3 feet bgs. Sandy Silt (ML): Whitish-tan, slightly moist to moist, very stiff to hard, with fine to 3.1-7.4 medium-grained sand. GS 3.5-4.0 E --Intermittent weak to moderate calcium carbonate cementation noted from 5.2 to 7.4 feet bgs. Poorly Graded Gravel with Sand (GP): Gray to tan, moist to saturated, very dense, with 7.4-11.3 fine to coarse-grained sand and 5-inch-minus cobbles. --Light sidewall caving noted throughout. Lab Test ID M L PI Sieve Analysis (% passing) % - - ff #4 #10 #40 #100 #200 E 34.7 NP NP 98 98 91 79 65.5 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 36 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-15 Date Advanced: 29 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.64865 Longitude: -116.46344 Depth to Water Table: 7.43 Feet bgs Total Depth: 9.8 Feet bgs Notes: Piezometer installed to 9.8 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, slightly moist 0.0-3.4 to moist, hard. 4.5+ --Plow zone noted to 1.4 feet bgs. Sandy Silt (ML): Whitish-tan, slightly moist to moist, hard, with fine to medium-grained 3.4-6.1 sand. --Intermittent weak to moderate calcium carbonate cementation noted from 4.2 to 6.1 feet bgs. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 6.1-9.8 with fine to coarse-grained sand and 8-inch- minus cobbles. --Light to moderate sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 37 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-16 Date Advanced: 29 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.64860 Longitude: -116.46611 Depth to Water Table: 10.2 Feet bgs Total Depth: 11.1 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, slightly moist 0.0-4.1 to moist, very soft to stiff. 0.0-1.25 --Plow zone noted to 1.3 feet bgs. Sandy Silt (ML): Whitish-tan, slightly moist 4.1-7.0 to moist, stiff to very stiff, with fine to medium-grained sand. Poorly Graded Sand with Silt and Gravel (SP-SM): Tan to gray, slightly moist to moist, 7.0-8.3 dense to very dense, with fine to coarse- grained sand and fine gravel. --Moderate sidewall caving noted throughout Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 8.3-11.1 with fine to coarse-grained sand and 6-inch- minus cobbles. --Moderate sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 38 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-17 Date Advanced: 29 June 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.64877 Longitude: -116.46906 Depth to Water Table: 10.46 Feet bgs Total Depth: 13.2 Feet bgs Notes: Piezometer installed to 13.2 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly 0.0-3.7 moist, medium stiff to stiff. --Plow zone noted to 1.4 feet bgs. Silty Sand (SM): Whitish-tan to dark brown, slightly moist to moist, very dense to dense, 3.7-5.6 with fine to medium-grained sand. --Weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray 5.6-13.2 to tan, slightly moist to saturated, very dense, with fine to coarse-grained sand and 7-inch- minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page# 39 of 51 INSPECTION b 1 80977g_geotech.docx ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-18 Date Advanced: 16 July 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65542 Longitude: -116.46346 Depth to Water Table: 4.97 Feet bgs Total Depth: 9.6 Feet bgs Notes: Piezometer installed to 9.6 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay(CL):Brown to dark brown, dry to slightly moist, very stiff to hard 0.0-4.1 2.5-4.5 --Intermittent weak calcium carbonate cementation from 2.9 to 4.1 feet bgs. Poorly Graded Gravel with Sand (GP): Gray 4.1-9.6 to tan, moist to saturated, very dense, with fine to coarse-grained sand and 6-inch-minus cobbles. 2791 S Victory View Way•Boise,ID 83709•(208)376-4748•Fax(208)322-6515 nals www.mti-id.com•mti(@mti-id.com Copyright©2&Ins18Map dial Testing&Inspection MATERIALS 20 July 2018 TESTI NG & Page#40 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-19 Date Advanced: 16 July 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65391 Longitude: -116.46343 Depth to Water Table: 11.20 Feet bgs Total Depth: 11.5 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-4.9 Lean Clay(CL):Brown to dark brown, dry to 4.5+ slightly moist, hard. Sandy Silt (ML): Whitish-tan to dark brown, slightly moist to moist, hard, with fine to 4.9-6.2 medium-grained sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Sand with Silt (SP-SM): Tan to brown, slightly moist to moist, dense, with 6.2-7.9 fine to medium-grained sand. --Light sidewall caving noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 7.9-11.5 with fine to coarse-grained sand and 9-inch- minus cobbles. --Light sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#41 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-20 Date Advanced: 16 July 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65575 Longitude: -116.47282 Depth to Water Table: 8.59 Feet bgs Total Depth: 12.1 Feet bgs Notes: Piezometer installed to 12.1 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Clayey Gravel with Sand Fill (GC-FILL): 0.0-0.7 Light brown, dry, medium dense, with fine to coarse-grained sand and 6-inch-minus cobbles. Lean Clay(CL):Brown to dark brown, dry to Bulk R-Value 0.7-4.1 slightly moist, very stiff to hard. GS 3.0-3.5 3.0-4.5 F Silty Sand (SM): Whitish-tan, slightly moist, 4.1-7.6 very dense, with fine to coarse-grained sand. --Weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Sand with Silt (SP-SM): Tan 7.6-10.2 to brown, moist to wet, medium dense to dense, with fine to coarse-grained sand. --Light sidewall caving noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, wet to saturated, very dense, with fine 10.2-12.1 to coarse-grained sand and 7-inch-minus cobbles. --Light sidewall caving noted throughout. Lab Test ID Ai LL PI Sieve Analysis % passing) % - - #4 #10 #40 #100 #200 F 23.8 32 9 100 99 95 93 88.7 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#42 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-21 Date Advanced: 16 July 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65570 Longitude: -116.46865 Depth to Water Table: 11.60 Feet bgs Total Depth: 12.1 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay Fill (CL-FILL): Dark brown, moist to wet, soft to stiff. 0.0-3.2 __Concrete and rebar rubble noted to a depth of 2.7. 3.2-5.1 Lean Clay (CL): Dark brown, moist to wet, stiff to very stiff. Sandy Silt (ML): Whitish-tan to light brown, moist to wet, very stiff to hard, with fine to 5.1-6.2 medium-grained sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, moist to saturated, very dense, with 6.2-12.1 fine to coarse-grained sand and 8-inch-minus cobbles. --Light to moderate sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#43 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-22 Date Advanced: 16 July 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65391 Longitude: -116.46686 Depth to Water Table: 9.54 Feet bgs Total Depth: 12.1 Feet bgs Notes: Piezometer installed to 12.1 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-3.9 Lean Clay(CL):Brown to dark brown, dry to 3.5-4.5+ slightly moist, very stiff to hard. Sandy Silt (ML): Whitish-tan to brown, slightly moist to moist, very stiff to hard, with 3.9-5.9 fine to medium-grained sand. --Weak to moderate calcium carbonate cementation noted from 5.1 to 5.9 feet bgs. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 5.9-12.1 with fine to coarse-grained sand and 12- inch-minus cobbles. --Light sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#44 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-23 Date Advanced: 16 July 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65391 Longitude: -116.47127 Depth to Water Table: 9.30 Feet bgs Total Depth: 10.5 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID 0.0-3.2 Lean Clay(CL): Light brown to dark brown, dry to moist, very stiff to hard. Silty Sand (SM): Whitish-tan to dark brown, slightly moist, dense to very dense, with fine 3.2-6.7 to coarse-grained sand. --Weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray to tan, moist to saturated, very dense, with 6.7-10.5 fine to coarse-grained sand and 9-inch-minus cobbles. --Light sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#45 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-24 Date Advanced: 16 July 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65576 Longitude: -116.47047 Depth to Water Table: 11.20 Feet bgs Total Depth: 12.6 Feet bgs Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay Fill (CL-FILL): Light brown, dry, 0.0-0.6 hard, with 6-inch-minus cobbles. 0.6-5.9 Lean Clay (CL): Dark brown, slightly moist 4.5+ to moist, hard. Silty Sand (SM): Whitish-tan, slightly moist, 5.9-7.0 dense to very dense, with fine to coarse- grained sand. Poorly Graded Gravel with Sand (GP): Gray to tan, slightly moist to saturated, very dense, 7.0-12.6 with fine to coarse-grained sand and 9-inch- minus cobbles. --Weak to moderate induration noted from 7.0 to 10.1 feet bgs. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)m Testing ti-id.com ght©g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#46 of 51 INSPECTION b 1 80977g_geotech.docx ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GRAVEL EQUIVALENT METHOD—PAVEMENT THICKNESS DESIGN PROCEDURES Pavement Section Design Location: Oaks North Subdivision,Residential Roadways Average Daily Traffic Count: 1,000 All Lanes&Both Directions Design Life: 20 Years Traffic Index: 6.00 Climate Factor: 1 R-Value of Subgrade: 5.00 Subgrade CBR Value: 2.5 Subgrade Mr: 3,750 R-Value of Aggregate Base: 80 R-Value of Granular Borrow: 60 Subgrade R-Value: 5 Expansion Pressure of Subgrade: 0.60 Unit Weight of Base Materials: 130 Total Design Life 18 kip ESAL's: 33,131 ASPHALTIC CONCRETE: Gravel Equivalent,Calculated: 0.384 Thickness: 0.1969231 Use= 2.5 Inches Gravel Equivalent,ACTUAL: 0.41 CRUSHED AGGREGATE BASE, Gravel Equivalent(Ballast): 0.768 Thickness: 0.329 — 4 Inches Gravel Equivalent,ACTUAL: 0.773 SUBBASE: Gravel Equivalent(Ballast): 1.824 Thickness: 1.051 Use= 14 Inches Gravel Equivalent,ACTUAL: 1.940 TOTAL Thickness: 1.708 Thickness Required by Exp.Pressure: 0.665 Design ACHD Depth Substitution Inches Ratios Asphaltic Concrete (at least 2.5): 2.50 1.95 Asphalt Treated Base (at least 4.2): 0.00 Cement Treated Base (at least 4.2): 0.00 Crushed Aggregate Base (at least 4.2): 4.00 1.10 Subbase (at least 4.2): 14.00 1.00 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id.com ght©Testing g&Inspection MATERIALS 20 July 2018 TESTI NG & Page#47 of 51 INSPECTION b 1 80977g_geotech.docx ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections R-VALUE LABORATORY TEST DATA Source and Description: TP-11: 1.0'-1.5', Lean Clay Date Obtained: 28 June 2018 Sample ID: 18-7577 Sampling and ASTM D75: AASHTO T2: X ASTM AASHTO X Preparation: D421: T87: Test Standard: ASTM AASHTO Idaho T8: X D2844: T 190: Sample A B C Dry Density(lb/ft) 97.9 96.5 95.3 Moisture Content N 20.1 22.9 24.0 Expansion Pressure (psi) 1.29 0.48 0.36 Exudation Pressure (psi) 267 150 92 R-Value 7 6 5 R-Value @ 200 psi Exudation Pressure = 6 R-Value @ Exudation Pressure 12.0 10.0 3 8.0 6.0 4.0 2.0 400 350 300 250 200 150 100 50 Exudation Pressure(psi) 2791 S Victory View Way•Boise,ID 83709•(208)376-4748•Fax(208)322-6515 nals www.mti-id.com•mti(@mti-id.com Copyright©2&Ins18Map dial Testing&Inspection MATERIALS 20 July 2018 TESTI NG & Page #48 of 51 INSPECTION b180977g geoteeh.aoex ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections R-VALUE LABORATORY TEST DATA Source and Description: TP-14: 1.0'-1.5', Lean Clay Date Obtained: 28 June 2018 Sample ID: 18-7578 Sampling and ASTM D75: AASHTO T2: X ASTM AASHTO X Preparation: D421: T87: Test Standard: ASTM AASHTO Idaho T8: X D2844: T 190: Sample A B C Dry Density(lb/ft3) 98.7 97.5 97.1 Moisture Content (%) 19.1 20.3 21.1 Expansion Pressure (psi) 1.02 0.48 0.04 Exudation Pressure (psi) 306 139 86 R-Value 18 14 12 R-Value @ 200 psi Exudation Pressure = 15 R-Value @ Exudation Pressure 35.0 25.0 m 3 15.0 5.0 400 350 300 250 200 150 100 50 Exudation Pressure(psi) 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright2018 www.mti-id.com•mti(c)mti-id.com ght©Testing g&IMaterials Inspection MATERIALS 20 July 2018 TESTI NG & Page #49 of 51 so INSPECTION b180977g geoteeh.aoex ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections R-VALUE LABORATORY TEST DATA Source and Description: TP-20: 3.0'-3.5', Lean Clay Date Obtained: 16 July 2018 Sample ID: 18-7629 Sampling and ASTM D75: AASHTO T2: X ASTM AASHTO X Preparation: D421: T87: Test Standard: ASTM AASHTO Idaho T8: X D2844: T 190: Sample A B C Dry Density(lb/ft3) NA NA NA Moisture Content(%) NA NA NA Expansion Pressure (psi) NA NA NA Exudation Pressure (psi) NA NA NA R-Value NA NA NA R-Value @ 200 psi Exudation Pressure= Less than 5** ** ASTM D2844 Note 2: Occasionally, material from very plastic clay-test specimens will extrude from under the mold and around the follower ram during the loading operation. If this occurs when the 800-psi point is reached and fewer than five lights are lighted, the soil should be reported as less than 5 R-value. R-Value @ Exudation Pressure 90.0 88.0 86.0 R > 84.0 82.0 80.0 400 350 300 250 200 150 100 50 Exudation Pressure (psi) 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 www.mti-id.com•mti(ubmti-id.com Copyright©g&Inspection Testing Vicinity Map Plate 1 MAP NOTES: I •Delorme Street Atlas •Not to Scale Site Location LEGEND Approximate Site Location 20 20 I 20 N O p Oaks North Subdivision d — Northeast Corner of McDermott Road z Meridian,ID a7 Modified from DeLorme by:CCW �-�-�- ����f���- m 20 July 2018 ` � Drawing:B180977g `z L 3 MATERIALS v TESTING >J INSPECTION 2791 S.Victory View Way Phone: 208 376-4748 W CHERRYr L Boise,ID 83709-2835 Fax: 208 322-6515 E-mail: mti@mti-id.com `1 Site Map Plate 2 NOTES: •Not to Scale •Aerial Photograph by Environmental - Risk Information Services S • LEGEND I , Approximate Site Boundary Approximate MTI Test 8 i Pit Location Approximate MTI Test TP-18 Pit Location T® TPB-24 TP�-21 ® with Piezometer T® T® TP-19 m .• 0 a 8 N n TP-2 TP 3 _ _ TP 4 _ TP-5 TP 6 TP 7 TP 8 TP 9 f , Oaks North Subdivision TP-14 TP-10 TP-1 ® Northeast Corner of McDermott Road �.' 8 . .. and McMillan Road TP-13 Meridian,ID L�I iR +, Modified by:MHS r 20 July 2018 TP-17 TP-16 TP 15 TP-12 TP-11 ,, � ' _ ® 8 ® ® ® • ,, �''� Drawing:B180977g MCMILLAN ROAD MATERIALS \ TESTING & low'fit' _f, I INSPECTION 2791 S.Victory View Way Phone: 208 376-4748 w c Boise,ID 83709-2835 Fax: 208 322-6515 E-mail: mti@mti-id.com + - r MATERIALS 15 November 2018 TESTI NG & Page# 1 of 14 INSPECTION b 180977g_add 1 ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Mr. Jeff Harris Coleman Homes, A Toll Brothers Company 3103 West Sheryl Drive, Suite 100 Meridian, ID 83642 208-424-0020 Re: Addendum #1 —Additional Test Pits Oaks North Subdivision Northeast Corner of McDermott Road and McMillan Road Meridian, ID Dear Mr. Harris: As requested, MTI advanced twelve additional test pits on the project site and installed piezometers. This addendum report presents test pit logs from the additional exploration not requested at the time of the previously issued MTI Geotechnical Engineering Report (13180977g). Descriptions of general site characteristics and the proposed project are available in the previous report. Unless otherwise noted in this addendum, all initial recommendations, limitations, and warranties expressed in the previous report must be adhered to. MTI appreciates this opportunity to be of service to you and looks forward to working with you in the future. If you have questions, please call (208) 376-4748. Respectfully Submitted, Materials Testing & Inspection NAL F,yc ENSF� /yt� n Q 14919 i Nick Stevens, G.I.T. Reviewed by: Monica acu s, P.E. Staff Geologist Senior Geotechni cal En i gPCOFOv, N�CA SA�V�v Enclosures: Geotechnical General Notes Geotechnical Investigation Test Pit Logs Site Map 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 www.mti-id.com•mti(a.mti-id.com (So� MATERIALS 15 November 2018 TESTI NG & Page #2 of 14 INSPECTION b t 80977g_addt ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL GENERAL NOTES RELATIVE DENSITY AND CONSISTENCY CLASSIFICATION Coarse-Grained Soils SPT Blow Counts(N) Fine-Grained Soils SPT Blow Counts(N) Very Loose: <4 Very Soft: <2 Loose: 4-10 Soft: 2-4 Medium Dense: 10-30 Medium Stiff: 4-8 Dense: 30-50 Stiff: 8-15 Very Dense: >50 Very Stiff: 15-30 Hard: >30 Moisture Content V Cementation Description Field Test Description Field Test Dry Absence of moisture,dusty,dry to touch Weakly Crumbles or breaks with handling or slight finger pressure Moist Damp but not visible moisture Moderately Crumbles or beaks with considerable finger pressure Wet Visible free water,usually soil is below Strongly Will not crumble or break with finger water table g pressure or PARTICLE SIZE Boulders: >12 in. Coarse-Grained Sand: 5 to 0.6 mm Silts: 0.075 to 0.005 mm m m Cobbles: 12 to 3 in. Medium-Grained Sand: 0.6 to 0.2 mm Clays: <0.005 m Gravel: 3 in.to 5 m Fine-Grained Sand: 0.2 to 0.075 mm UNIFIED SOIL CLASSIFICATION SYSTEM Major Divisions AII&L Symbol Soil Descriptions Gravel&Gravelly GW Well-graded gravels;gravel/sand mixtures with little or no fines Soils GP Poorly-graded gravels;gravel/sand mixtures with little or no fines Coarse-Grained <50% coarse fraction GM Silty gravels;poorly-graded gravel/sand/silt mixtures Soils passes No.4 sieve GC Clayey gravels;poorly-graded gravel/sand/clay mixtures <50% passes No.200 Sand&Sandy SW Well-graded sands;gravelly sands with little or no fines sieve Soils SP Poorly-graded sands;gravelly sands with little or no fines >50% coarse fraction SM Silty sands;poorly-graded sand/gravel/silt mixtures passes No.4 sieve SC Clayey sands;poorly-graded sand/gravel/clay mixtures ML Inorganic silts; sandy,gravelly or clayey silts Silts&Clays CL Lean clays;inorganic,gravelly,sandy,or silty,low to medium-plasticity clays Fine Grained LL<50 Soils>50% OL Organic,low-plasticity clays and silts passes No.200 MH Inorganic,elastic silts; sandy,gravelly or clayey elastic silts sieve Silts&Clays LL>50 CH Fat clays;high-plasticity,inorganic clays OH Organic,medium to high-plasticity clays and silts Highly Organic Soils PT Peat,humus,hydric soils with high organic content 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection (So� MATERIALS 15 November 2018 TESTI NG & Page# 3 of 14 INSPECTION b180977g_addl ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-25 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65732 Longitude: -116.46345 Depth to Water Table: 9.4 Feet bgs Total Depth: 10.6 Feet bgs Notes: Piezometer installed to 10.6 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay(CL):Brown, dry to slightly moist, 0.0-5.2 soft to stiff. 0.25-1.0 --Plow zone noted to a depth of 0.7 foot bgs. Poorly Graded Gravel with Clay and Sand 5 2-8 2 (GP-GC): Reddish-brown, moist, dense, with fine to medium-grained sand and 10-inch minus cobbles. Poorly Graded Gravel with Sand (GP): Tan 8.2-10.6 to gray, moist to saturated, dense, with fine to coarse-grained sand and 8-inch minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection (So� MATERIALS 15 November 2018 TESTI NG & Page #4 of 14 INSPECTION b t 80977g_addt ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-26 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65666 Longitude: -116.45874 Depth to Water Table: 8.7 Feet bgs Total Depth: 12.5 Feet bgs Notes: Piezometer installed to 12.5 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly 0.0-6.3 moist, soft to stiff. 0.5-1.0 --Plow zone noted to a depth of 1.4 feet bgs. Poorly Graded Gravel with Clay and Sand (GP-GC):Reddish-dark brown, slightly moist 6.3-8.7 to moist, medium dense to dense, with fine to medium-grained sand and 5-inch minus cobbles. Poorly Graded Gravel with Sand (GP): Tan to gray, saturated, dense, with fine to coarse- 8.7-12.5 grained sand and 11-inch minus cobbles. --Excessive sidewall caving noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection (So� MATERIALS 15 November 2018 TESTI NG & Page # 5 of 14 INSPECTION b t 80977g_addt ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-27 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65456 Longitude: -116.45861 Depth to Water Table: 8.9 Feet bgs Total Depth: 10.8 Feet bgs Notes: Piezometer installed to 10.8 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly 0.0-3.9 moist, soft to stiff. 0.25-1.0 --Plow zone noted to a depth of 1.2 feet bgs. Sandy Silt (ML): Whitish-tan to light gray, slightly moist, very stiff to hard, with fine- 3.9-4.9 grained sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Tan to gray, slightly moist to saturated, dense to 4.9-10.8 very dense, with fine to coarse-grained sand and 8-inch minus cobbles. --Some silt content and calcium carbonate veining noted from 4.9 to S.6 feet bgs. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection (So� MATERIALS 15 November 2018 TESTI NG & Page # 6 of 14 INSPECTION b t 80977g_addt ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-28 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65425 Longitude: -116.46263 Depth to Water Table: 9.2 Feet bgs Total Depth: 11.5 Feet bgs Notes: Piezometer installed to 11.5 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly moist, stiff to very stiff. 5- 0.0-5.6 --Plow zone noted to a depth of 1.4 feet bgs. 2.25 --Calcic veining noted from 2.5 to 5.6 feet bgs. Poorly Graded Gravel with Clay and Sand (GP-GC):Reddish-dark brown, slightly moist 5.6-8.7 to moist, medium dense to dense, with fine to coarse-grained sand and 4-inch minus cobbles. Poorly Graded Gravel with Sand (GP): Tan 8.7-11.5 to gray, moist to saturated, dense to very dense, with fine to coarse-grained sand and 8-inch minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection (So� MATERIALS 15 November 2018 TESTI NG & Page # 7 of 14 INSPECTION b t 80977g_addt ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-29 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65349 Longitude: -116.46093 Depth to Water Table: 9.6 Feet bgs Total Depth: 11.4 Feet bgs Notes: Piezometer installed to 11.4 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly moist, soft to stiff. 0.0-3.3 --Plow zone noted to a depth of 1.2 feet bgs. 0.5-1.25 --Calcic veining noted from 3.0 to 3.3 feet bgs. Sandy Silt (ML): Light gray to light brown, dry to slightly moist, hard, with fine-grained 3.3-5.5 sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Brown to gray, slightly moist to saturated, 5.5-11.4 dense to very dense, with fine to coarse- grained sand and 8-inch minus cobbles. --Some clay content noted to 7.2 feet bgs. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection MATERIALS 15 November 2018 TESTI NG & Page# 8 of 14 INSPECTION b180977g_addl ❑Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-30 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65256 Longitude: -116.47153 Depth to Water Table: 9.3 Feet bgs Total Depth: 11.5 Feet bgs Notes: Piezometer installed to 11.5 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly 0.25- 0.0-6.2 moist, soft to medium stiff. --Plow zone noted to a depth of 1.3 feet bgs. 0.75 Poorly Graded Gravel with Sand (GP): Light 6.2-11.5 brown to gray, slightly moist to saturated, dense to very dense, with fine to coarse- grained sand and 5-inch minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(@mti-id.com ght©Testing g&I Materials Inspection (So� MATERIALS 15 November 2018 TESTI NG & Page# 9 of 14 INSPECTION b180977g_addl ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-31 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65234 Longitude: -116.46827 Depth to Water Table: 10.8 Feet bgs Total Depth: 11.7 Feet bgs Notes: Piezometer installed to 11.7 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly 0.0-2.7 moist, soft to stiff. 0.5-1.25 --Plow zone noted to a depth of 1.4 feet bgs. Sandy Silt(ML): Light gray to brown, dry to 2 7-5 2 slightly moist, hard, with fine-grained sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Tan 5.2-11.7 to gray, slightly moist to saturated, dense to very dense, with fine to coarse-grained sand and 7-inch minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection MATERIALS 15 November 2018 TESTI NG & Page # 10 of 14 (So� INSPECTION b t 80977g_addt ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-32 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65260 Longitude: -116.46399 Depth to Water Table: 11.0 Feet bgs Total Depth: 11.3 Feet bgs Notes: Piezometer installed to 11.3 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly 0.0-1.8 moist, medium stiff to stiff. 0.75-1.5 --Plow zone noted to a depth of 1.4 feet bgs. Sandy Silt(ML):Light brown, dry to slightly 1.8-6.3 moist, hard, with fine-grained sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Tan 6.3-11.3 to gray, dry to saturated, dense to very dense, with fine to coarse-grained sand and 5-inch minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection MATERIALS 15 November 2018 TESTI NG & Page # 11 of 14 (So� INSPECTION b t 80977g_addt ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-33 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65539 Longitude: -116.46532 Depth to Water Table: 9.8 Feet bgs Total Depth: 10.9 Feet bgs Notes: Piezometer installed to 10.9 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay(CL):Brown, dry to slightly moist, 0.75- 0.0-3.1 medium stiff to stiff. 1.75 --Plow zone noted to a depth of 1.2 feet bgs. Sandy Silt(ML):Light brown, dry to slightly moist, very stiff to hard, with fine-grained 3.1-5.4 sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Brown to gray, slightly moist to saturated, 5.4-10.9 dense to very dense, with fine to coarse- grained sand and 8-inch minus cobbles. --Some clay content noted to 7.3 feet bgs. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection MATERIALS 15 November 2018 TESTI NG & Page# 12 of 14 (So� INSPECTION b180977g_addt ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-34 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65484 Longitude: -116.46848 Depth to Water Table: 10.3 Feet bgs Total Depth: 12.8 Feet bgs Notes: Piezometer installed to 12.8 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay(CL):Brown, dry to slightly moist, 0.0-3.3 soft to stiff. 0.5-1.25 --Plow zone noted to a depth of 1.2 feet bgs. Sandy Silt(ML):Light brown, dry to slightly 3.3-8.1 moist, hard, with fine-grained sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Sand with Silt(SP-SM):Light 8.1-9.9 brown to tan, moist to wet, medium dense, with fine to coarse-grained sand. Poorly Graded Gravel with Sand (GP): Tan 9.9-12.8 to gray, wet to saturated, dense to very dense, with fine to coarse-grained sand and 7-inch minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection MATERIALS 15 November 2018 TESTI NG & Page # 13 of 14 (So� INSPECTION b t 80977g_addl ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-35 Date Advanced: 29 Oct 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Creighton Contracting, LLC Location: See Site Map Plates Latitude: 43.65440 Longitude: -116.47120 Depth to Water Table: 11.3 Feet bgs Total Depth: 12.3 Feet bgs Notes: Piezometer installed to 12.3 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly 0.0-3.3 moist, soft to stiff. 1.25 --Plow zone noted to a depth of 1.4 feet bgs. 1.25 Sandy Silt(ML): Light brown to gray, dry to 3.3-9.7 slightly moist, hard, with fine-grained sand. --Weak calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Tan 9.7-12.3 to gray, slightly moist to saturated, dense to very dense, with fine to coarse-grained sand and 9-inch minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 Copyright www.mti-id.com•mti(a)mti-id Testing.com ght©g&Inspection Site Map Plate 2 NOTES: •Not to Scale •Aerial Photograph by Environmental - Risk Information Services S y LEGEND Approximate Site TP-25 Boundary Approximate MTI Test 8 T® i- � Pit Location-Advanced 29 June 2018 ■ u TP-20 TP-18 Approximate MTI Test Pit Location-Advanced 8 8 T® 16 July 2018 TP-27 28 Approximate MTI Test TP 36 TP 34 TP- Pit Location-Advanced ® TP 35 ® ® 29 October 2018 ® TP 23 TP 22 TP-19 o Approximate MTI Test o TP-29 Pit Location with Piezometer o TP-31 . TP 32.R'. - D TP30 ® N TP-2 -t-- _ TP 3 TP 4 TP 5 TP 6 TP 7 TP-8 TP-9 f , n � � Oaks North Subdivision TP-14 .TP-10 TP-1 ® Northeast Corner of McDermott Road . .. and McMillan Road TP-13 t `�� �� Meridian,ID +, Modified by:NGS ' r 6 November 2018 TP 17 TP 16 TP 15 TP-12 TP-11 �''� Drawing:B180977g MATERIALS -} ►, ' ice\ -�� :- f . i .` - �: = TESTING & Ing, '�1 _ I INSPECTION 2791 S.Victory View Way Phone: 208 376-4748 w c Boise,ID 83709-2835 Fax: 208 322-6515 ' E-mail: mti@mti-id.com MATERIALS 8 February 2019 Page# 1 of 11 { TESTING & INSPECTION bl80977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Mr. Jeff Harris Coleman Homes,A Toll Brothers Company 3103 West Sheryl Drive, Suite 100 Meridian,ID 83642 208-424-0020 Re: Addendum #2 — Infiltration Testing and Additional Pavement Recommendations Oaks North Subdivision Northeast Corner of McDermott Road and McMillan Road Meridian,ID Dear Mr. Harris: This addendum report presents test results not requested at the time of the previously issued MTI Geotechnical Engineering Report (13180977g). Descriptions of general site characteristics and the proposed project are available in the previous report. Unless otherwise noted in this addendum or the previous addendum, all initial recommendations, limitations, and warranties expressed in the previous report must be adhered to. Infiltration Testing Infiltration testing was conducted in general accordance with the Ada County Highway District(ACHD)Policy Manual. Test pit areas will need to be re-excavated and compacted prior to construction of structures that will be sensitive to settlement. Test locations were presoaked prior to testing. Pre-soaking increases soil moistures, which allows the tested soils to reach a saturated condition more readily during testing. Saturation of the tested soils is desirable in order to isolate the vertical component of infiltration by inhibiting horizontal seepage during testing. Testing was conducted on 7 February 2019. Details and results of testing are as follows: Infiltration Testing Results Stabilized Test Test Infiltration Design Location Depth Soil Type Rate Infiltration Rate (feet bgs) (inches/hour) (inches/hour) TP-37 5.4 Poorly graded gravel with sand 6.24 3.12 TP-38 4.3 Sandy silt 1.2 0.6 TP-39 4.0 Sandy silt 0.24 0.12* TP-40 5.0 Poorly graded gravel with sand >8 *Per the ACHD Policy Manual, a minimum design infiltration of 0.5 inch per hour is required. **Per the ACHD Policy Manual, the maximum design infiltration rate is 8 inches per hour. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748• Fax(208)322-6515 als www.mti-id.com•mti mti-id.com Copyright©2019 sapectertion Testing R Inspection MATERIALS 8 February 2019 Page#2 of 11 { TESTING & INSPECTION bl80977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections In accordance with the ACHD Policy Manual,a factor of safety of 2 has been applied to the stabilized infiltration rates achieved during testing. MTI recommends that all infiltration facilities be constructed in accordance with the local municipality requirements Recommended Pavement Sections As required by Ada County Highway District (ACHD), MTI has used a traffic index of 8 to determine the necessary pavement cross-section for the proposed collector roadways. MTI has made assumptions for traffic loading variables based on the character of the proposed construction. The Client should review these assumptions to make sure they reflect intended use and loading of pavements both now and in the future. During the original investigation, MTI collected three samples of near-surface soils for Resistance Value (R-value) testing representative of soils to depths of 3.5 feet below existing ground surface. These samples, consisting of lean clay collected from test pits 11, 14, and 20, yielded R-values of 6, 15, and less than 5, respectively. For design, MTI elected to use an R-value of 5, which is considered representative of the overall subdivision. The following are minimum thickness requirements for assured pavement function. Depending on site conditions, additional work, e.g. soil preparation, may be required to support construction equipment. These have been listed within the Soft Subgrade Soils section of the original report. Results of the test are graphically depicted in the Enclosures section. Flexible Pavement Section The Gravel Equivalent Method, as defined in Section 500 of the State of Idaho Department of Transportation (ITD) Materials Manual, was used to develop the pavement sections. ACHD parameters for traffic index and substitution ratios, which were obtained from the ACHD Policy Manual, were also used in the design. A calculation sheet provided in the Enclosures section indicates the soils constant, traffic loading, traffic projections, and material constants used to calculate the pavement sections. MTI recommends that materials used in the construction of asphaltic concrete pavements meet the requirements of the ISPWC Standard Specification for Highway Construction. Construction of the pavement section should be in accordance with these specifications and should adhere to guidelines recommended in the Construction Considerations section of the original report. Gravel Equivalent Method Flexible Pavement Specifications Pavement Section Component' Roadway Section Asphaltic Concrete 3.5 Inches Crushed Aggregate Base 6.0 Inches Structural Subbase 16.0 Inches Compacted Subgrade See Pavement Subgrade Preparation Section 'It will be required for MTI personnel to verify subgrade competency at the time of construction. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748• Fax(208)322-6515 als www.mti-id.com•mti mti-id.com Copyright©2019 sapectertion Testing R Inspection MATERIALS 8 February 2019 Page# 3 of 11 { TESTING & INSPECTION bl80977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Asphaltic Concrete: Asphalt mix design shall meet the requirements of ISPWC, Section 810 Class III plant mix. Materials shall be placed in accordance with ISPWC Standard Specifications for Highway Construction. Aggregate Base: Material complying with ISPWC Standards for Crushed Aggregate Materials. Structural Subbase: Material complying with requirements for granular structural fill (uncrushed) as defined in ISPWC. Pavement Subuade Preparation Uncontrolled fill,which contained debris, and plow zones (which should be treated as fill)were encountered in portions of the site. MTI recommends that these fill materials be excavated to a sufficient depth to expose competent, native soils or to a minimum depth of 11/2 feet below existing grade. If fill materials remain after over-excavation, the exposed subgrade must be compacted to at least 95 percent of the maximum dry density as determined by ASTM D698. MTI personnel must be present during excavation to identify these materials. Common Pavement Section Construction Issues The subgrade upon which above pavement sections are to be constructed must be properly stripped, compacted (if indicated),inspected, and proof-rolled. Proof rolling of subgrade soils should be accomplished using a heavy rubber-tired, fully loaded,tandem-axle dump truck or equivalent. Verification of subgrade competence by MTI personnel at the time of construction is required. Fill materials on the site must demonstrate the indicated compaction prior to placing material in support of the pavement section. MTI anticipated that pavement areas will be subjected to moderate traffic. Subgrade clays and silts near and above optimum moisture contents may pump during compaction. Pumping or soft areas must be removed and replaced with structural fill. Fill material and aggregates, as well as compacted native subgrade soils, in support of the pavement section must be compacted to no less than 95 percent of the maximum dry density as determined by ASTM D698 for flexible pavements and by ASTM D1557 for rigid pavements. If a material placed as a pavement section component cannot be tested by usual compaction testing methods, then compaction of that material must be approved by observed proof rolling. Minor deflections from proof rolling for flexible pavements are allowable. Deflections from proof rolling of rigid pavement support courses should not be visually detectable. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748• Fax(208)322-6515 als www.mti-id.com•mti mti-id.com Copyright©2019 s8pectertion Testing R Inspection MATERIALS 8 February 2019 TESTING & Page#4 of 11 INSPECTION b180977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections Respectfully Submitted, Materials Testing & Inspection l.�yl Ni lc Stevens,G.I.T. Reviewed by: Monica Saculles, P.E. Staff Geologist Senior Geotechnical Engineer NAL FN ENSFO Reviewed by: Jachlador, P.E. 18300 Geotechnical Engineer s v,4 �ql f OF �pP�QO CCe SCN�'P Enclosures: Geotechnical General Notes Geotechnical Investigation Test Pit Logs Site Map 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 www.mti-id.com•mtiftmb-id.com MATERIALS 8 February 2019 Page# 5 of 11 { TESTING & INSPECTION bt80977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL GENERAL NOTES RELATIVE DENSITY AND CONSISTENCY CLASSIFICATION Coarse-Grained Soils SPT Blow Counts(N) Fine-Grained Soils SPT Blow Counts (N) Very Loose: <4 Very Soft: <2 Loose: 4-10 Soft: 2-4 Medium Dense: 10-30 Medium Stiff: 4-8 Dense: 30-50 Stiff: 8-15 Very Dense: >50 Very Stiff: 15-30 Hard: >30 Moisture Content Cementation Description Field Test Description Field Test Dry Absence of moisture,dusty,dry to touch Weakly Crumbles or breaks with handling or slight finger pressure Moist Damp but not visible moisture Moderately Crumbles or beaks with considerable finger pressure Wet Visible free water,usually soil is below Strongly Will not crumble or break with finger water table g pressure PARTICLE SIZE Boulders: >12 in. Coarse-Grained Sand: 5 to 0.6 mm Silts: 0.075 to 0.005 min Cobbles: 12 to 3 in. Medium-Grained Sand: 0.6 to 0.2 mm Clays: <0.005 min Gravel: 3 in.to 5 mm Fine-Grained Sand: 0.2 to 0.075 min 71177 1UNIFIED SOIL CLASSIFICATION SYSTEM Major Divisions Symbol Soil Descriptions Gravel&Gravelly GW Well-graded gravels;gravel/sand mixtures with little or no fines Soils GP Poorly-graded gravels;gravel/sand mixtures with little or no fines Coarse-Grained <50% coarse fraction GM Silty gravels;poorly-graded gravel/sand/silt mixtures Soils passes No.4 sieve GC Clayey gravels;poorly-graded gravel/sand/clay mixtures <50% passes No.200 Sand&Sandy SW Well-graded sands;gravelly sands with little or no fines sieve Soils SP Poorly-graded sands;gravelly sands with little or no fines >50% coarse fraction SM Silty sands;poorly-graded sand/gravel/silt mixtures passes No.4 sieve SC Clayey sands;poorly-graded sand/gravel/clay mixtures ML Inorganic silts; sandy,gravelly or clayey silts Silts&Clays Fine Grained LL<50 CL Lean clays;inorganic,gravelly,sandy,or silty,low to medium-plasticity clays Soils>50% OL Organic,low-plasticity clays and silts passes No.200 MH Inorganic,elastic silts; sandy,gravelly or clayey elastic silts sieve Silts&Clays LL>50 CH Fat clays;high-plasticity,inorganic clays OH Organic,medium to high-plasticity clays and silts Highly Organic Soils PT Peat,humus,hydric soils with high organic content 2791 S Victory View Way•Boise, ID 83709•(208)376-4748• Fax(208)322-6515 als www.mti-id.com•mti mti-id.com Copyright©2019 s8pectertion Testing R Inspection MATERIALS 8 February 2019 Page# 6 of 11 { TESTING & INSPECTION bl80977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-37 Date Advanced: 6 Feb 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Struckman's Backhoe Service Location: See Site Map Plates Latitude: 43.65038 Longitude: -116.46949 Depth to Water Table: Not Encountered Total Depth: 5.4 Feet bgs Notes: Infiltration testing conducted at 5.4 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay Fill (CL-FILL): Dark brown, slightly moist, medium stiff. 0.0-0.9 --Some fine-grained sand and 8-inch minus 0.75-1.0 cobbles noted throughout. 0.9-2.9 Lean Clay (CL): Dark brown, slightly moist 0.5-1.5 to moist, soft to stiff. Sandy Silt(ML): Whitish-tan to light brown, dry to slightly moist, very stiff to hard, with 2.9-4.3 fine-grained sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray 4.3-5.4 to tan, dry, dense, with fine to coarse-grained sand and 6-inch-minus cobbles. --Some clay content noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748• Fax(208)322-6515 als www.mti-id.com•mti mti-id.com Copyright©2019 s8pectertion Testing R Inspection MATERIALS 8 February 2019 TESTING & Page# 7 of I I INSPECTION bl80977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-38 Date Advanced: 6 Feb 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Struckman's Backhoe Service Location: See Site Map Plates Latitude: 43.652049 Longitude: -116.473185 Depth to Water Table: Not Encountered Total Depth: 4.3 Feet bgs Notes: Infiltration testing conducted at 4.3 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab (Feet bgs) Sediment Classification Type (Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, slightly moist, 0.0-2.9 stiff. 1.25-1.75 --Plow zone noted to a depth of 0.8 foot bgs. Sandy Silt (ML): Whitish-tan, dry to slightly moist, hard, with fine-grained sand. 2.9-4.3 --Intermittent weak to moderate calcium carbonate cementation noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748•Fax(208)322-6515 als www.mti-id.com•mti mti-id.com Copyright©2019 sapection Testing&Inspection MATERIALS 8 February 2019 Page# 8 of 11 { TESTING & INSPECTION b180977g_aad2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-39 Date Advanced: 6 Feb 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Struckmans's Backhoe Service Location: See Site Map Plates Latitude: 43.649706 Longitude: -116.461384 Depth to Water Table: Not Encountered Total Depth: 4.0 Feet bgs Notes: Infiltration testing conducted at 4.0 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab Feet bgs) Sediment Classification Type Feet bgs) Qp Test ID Lean Clay (CL): Dark brown, dry to slightly moist, stiff to very stiff. 0.0-3.5 --Plow zone noted to 0.7 foot bgs. 1.75-3.0 --Intermittent weak calcium carbonate cementation from 3.9 to 5.8 feet bgs. Sandy Silt (ML): Tan to light brown, dry to slightly moist, very stiff to hard, with fine to 3.5-4.0 medium-grained sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748• Fax(208)322-6515 als www.mti-id.com•mti mti-id.com Copyright©2019 sapectertion Testing R Inspection MATERIALS 8 February 2019 Page# 9 of 11 { TESTING & INSPECTION bl80977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log#: TP-40 Date Advanced: 6 Feb 2018 Logged by: Nick Stevens, G.I.T. Excavated by: Struckman's Backhoe Service Location: See Site Map Plates Latitude: 43.652004 Longitude: -116.458787 Depth to Water Table: Not Encountered Total Depth: 5.0 Feet bgs Notes: Infiltration testing conducted at 5.0 feet bgs. Depth Field Description and USCS Soil and Sample Sample Depth Lab Feet bgs) Sediment Classification Type Feet bgs) Qp Test ID 0.0-1.5 Lean Clay (CL): Dark brown, slightly moist, 0.75-1.5 medium stiff to stiff. Sandy Silt (ML): Whitish-tan, dry to slightly moist, very stiff to hard, with fine to medium- 1.5-3.4 grained sand. --Intermittent weak to moderate calcium carbonate cementation noted throughout. Poorly Graded Gravel with Sand (GP): Gray 3.4-5.0 to tan, dry, very dense, with fine to coarse- grained sand and 7-inch-minus cobbles. 2791 S Victory View Way•Boise, ID 83709•(208)376-4748• Fax(208)322-6515 als www.mti-id.com•mti mti-id.com Copyright©2019 sapectertion Testing R Inspection MATERIALS 8 February 2019 Page# 10 of 11 { TESTING & INSPECTION bl80977g_add2 AN ATLAS COMPANY ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing ❑Special Inspections GRAVEL EQUIVALENT METHOD—PAVEMENT THICKNESS DESIGN PROCEDURES Pavement Section Design Location: Oaks North Subdivision,Collector Roadway Average Daily Traffic Count: 2,000 All Lanes&Both Directions Design Life: 20 Years Traffic Index: 8.00 Climate Factor: 1 R-Value of Subgrade: 5.00 Subgrade CBR Value: 2.5 Subgrade Mr: 3,750 R-Value of Aggregate Base: 80 R-Value of Granular Borrow: 60 Subgrade R-Value: 5 Expansion Pressure of Subgrade: 0.60 Unit Weight of Base Materials: 130 Total Design Life 18 kip ESAL's: 371,659 ASPHALTIC CONCRETE: Gravel Equivalent,Calculated: 0.512 Thictmess: 0.262564103 Use— 3.5 Inches Gravel Equivalent,ACTUAL: 0.57 CRUSHED AGGREGATE BASE: Gravel Equivalent(Ballast): 1.024 Thickness: 0.414 Use= 6 Inches Gravel Equivalent,ACTUAL: 1.119 SUBBASE: Gravel Equivalent(Ballast): 2.432 Thictmess: 1.313 Use= 16 Inches Gravel Equivalent,ACTUAL: 2.452 TOTAL Thickness: 2.125 Thickness Required by Exp.Pressure: 0.665 Design ACHD Depth Substitution Inches Ratios Asphaltic Concrete(at least 2.5): 3.50 1.95 Asphalt Treated Base(at least 4.2): 0.00 Cement Treated Base(at least 4.2): 0.00 Crushed Aggregate Base(at least 4.2): 6.00 1.10 Subbase(at least 4.2): 16.00 1.00 2791 S Victory View Way•Boise, ID 83709•(208)376-4748• Fax(208)322-6515 als www.mti-id.com•mti mtkid.com Copyright©2019 s8pectertion Testing R Inspection Site Map Plate 1 NOTES: •Not to Scale •Aerial Photograph by Environmental - Risk Information Services ' s LEGEND Approximate Site ------- Boundary Approximate MTI Test TP-25 Pit Location-Advanced 29 June 2018 TP 26 '�' ; Approximate MTI Test _ ® Pit Location-Advanced 8 16 July 2018 u TP 20 TP 18 1 8 8 TP-33 0 Approximate MTI Test � ® TP-27 Pit Location-Advanced TP-36 TP-34 I 29 October 2018 ® TP-28 TP 35 ® 8 Approximate MTI Test ® TP 23 TP 22 TP-19 m ® ® Pit Location-Advanced 8 o6 February 2019 TP-29 o kk ® �i Approximate MTI Test Pit Location with Piezometer T® _ _ TP 3 TP 4 TP-5 TP-6 TP-7 TP-8 TP-38 8 — TP-40 -, r'� � •' — Oaks North Subdivision TP 1 TP-14 T® Northeast Corner of McDermott Road ` 8 ® TP-13 �! and McMillan Road TP-37 TP-39 Meridian,ID ® t 8 � Modified by:NGS r 8 February 2018 w; TP 17 TP 16 TP-15 TP-12 TP 11 �' � Drawing:B180977g MCMILLAN ROAD MATERIALS TESTING & ►� - �� tl', :� �„ ��� _ I INSPECTION 2791 S.Victory View Way Phone: 208 376-4748 Boise,ID 83709-2835 Fax: 208 322-6515 E-mail: mti@mti-id.com �f7 r