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HomeMy WebLinkAboutSilversprings Subdivision FP App (2).x Pa xx :n TRANSMITTALS TO AGENCIES FOR COMMENTS ON DEVELOPMENT PROJECTS WITH THE CITY OF MERIDIAN yA To insure that your comments and recommendations will be considered by �P the Meridian City Council please submit your MAYOR comments and recommendations to Meridian City Hall Tye Weerd CITY COUNCIL Keith Bird Jse h . porton Charles M. Rountree Shaun Wardle CITY DEPARTMENTS CityAttorney/HR 703 Main Street 898-5506 (City Attorney) 898-5503 Fax 884-8723 Fire 540 E. Franklin Road 888-1,234 fax 895-0390 Parks & Recreation 11 W. Bower Street 888-3579 / fax 898-5501 Planning 660 E. Watertower Lane Suite 202 884-5533 fax 888-6854 Police 1401 E. Watertower Leas 888-6678 fax 846-7366 Public Works 660 E. Watertower bane Suite 200 898-5500 fax 898-9551 Building 660 E. Watertower Lane Suite 150 887-221 fax 887-1297 Wastewater 3401 N. Ten Mile Road 888-2191 fax 884-0744 Water 2235 N.W. 8th Street 888-5242 fax 884-1159 Attn : Will Berg, City Clerk, by: November 28, 2006 Transmittal Date: November 14, 2006 Hearing Date: December 5, 2006 File No.: FP 06,049 Request: Final Plat approval for 29 single-family residential building lots and 4 common lots on 9.88 acres in an R,4 zone for Silversprings Subdivision By: Reed Kofoed Location of Property or Project: 905 & Soy E. McMillan Road David Zaremba (no FP) Meridian School District (No FP) David Moe (no FP) Meridian Post Office(FP/PP only) Wendy Newton-Huckabay (No FP) Ada County Highway District Michael Rohm (No FP) Ada County Development Services Keith Borup (No FP) Central District Health i■ Tammy de Weerd, Mayor Nampa Meridian Irrig. District Charlie Rountree, CIC Settlers Irrig. District Joe Borton, CIC Idaho Power Co. (FP,PP,CUP) Keith Bird, C/C Qwest (FP/PP only) Shaun Wardle, CIC Intermountain Cas (FP/PP only) Water Department Bureau of Reclamation (FP/PP only) Sewer Department Idaho Transportation Dept. (No FP Sanitary Services(No VAR, VAC, FP) Ada County Ass. Land Records Building Department / Rich Greene Meridian Development Corp. Fire Department Historical Preservation Comm. Police Department City Attorney City Engineer City Planner Parks Department Economic Dev. /Cheryl Brown (CUP only) Your Concise Remarks: r CiTy HALL 33 EAST 1DAHo AVENUE MERIDIAN, 1j)AHo 83642 (208) 888-4433 CITY CLERKwFAX888-4218 FINANCE UTILITY I L L I4108FR 8119 Printed on recycled paper NY/. w' Planning Department artment w� SION & COUNCIL REVIEW APPLICATION w i�lr M Type of Review Requested (check all that ably) ❑ Annexation and Zoning ❑ Comprehensive Plan Map Amendment ❑ Comprehensive Plan Text Amendment ❑ Conditional Use Permit ❑ Conditional Use Permit Modification ® Final Plat ❑ Final Plat Modification ❑ Planned Unit Development ❑ Preliminary Plat ❑ Rezone ❑ Time Extension (Commission or Council) ❑ UDC Text Amendment ❑ Vacation (Council) ❑ Variance ❑ Other STAFF USE ONLY: Filenumber(s): 1r1"—�� � 0�c9 Project name: Date filed: ate complete: Assigned Planner: Related files: 07. Hearing date:Commission Council Applicant Information i�AA� 1 AAAAAAAA�A IAAAA.� 1 A- 1 .1 Applicant name: Reed Kofoed Phone: 208.484.7818 Applicant address: 228 E. Plaza St., Ste. G 1, Eagle, Idaho Applicant's interest in property: ❑ Own ❑ Rent ® Optioned ❑ Other Owner name: Reed Kofeed Owner address: 228 E. Plaza St., Ste. G1. Eagle, Idaho Agent name (e.g., architect, engineer, developer, representative): Ross Erickson, P.E. Zip: 83616 Phone: 208.484.7818 Zip: 83616 Firm name: Erickson Civil, Inc. Phone: 208.867.3954 Address: 1854 E. Lanark St. Meridian, Idaho Zip: 83642 Primary contact is: ❑ Applicant ❑ Owner o Agent ❑ Other Contact name: Ross Erickson Phone: 208.867.3954 E-mail: ross@ericksoncivil.com gam; 208.846.8956 Subject Property Information Locarion/stredt address: 905 & 805 E. McMillan Road Assessor's parcel numbers): R1608650020 & R10608650010 Township, range, section: TAN R.1 E Sect. 31 Total acreage: 5.08 + 4.80-9.88 Current land use: Single Family 1 Pasture Current zoning district: RUT 1 660 E. Watertower Lane, Suite 202 9 Meridian, Idaho 83642 Phone: (208) 884-5533 q Facsimile: (208) 888-6854 g Website: i i i 1 Project Description Project/subdivision name: Silvers rin s Subdivision General description of proposed project/request: Final Plat Approval for 29 building lots, 4 common lots Proposed zoning district(s): R-4 Acres of each zone proposed: 9.88 Type of use proposed (check all that apply): to Residential o Commercial ❑ mice o Industrial ❑ Other Amenities provided with this development (if applicable): NIA Who will own & maintain the pressurized irrigation system in this development? Settler's Irrigation District Which irrigation district does this property lie within? Settler's Irrigation District Primary irrigation source: Existing Settler's PI System �^ Secondary: C!ty of Meridian Square footage of landscaped areas to be irrigated (if W immy or secwdary point of connection is City water): Residential Project Summary (if applicable) Number of residential units: 29 Number of building lots: 29 Number of common and/or other lots: 4 Proposed number of dwelling units (for multi -family developments only): 1 Bedroom: NIA 2 or more Bedrooms: NIA Minimum square footage of structure(s) (excl. garage): NIA Minimum property size (s.f): 8,050 Gross density (macre-total lard): 2.94 Percentage of open space provided: 9.62 Proposed building height: NIA Ni Average property size (s.f.): 10,998 Net density (DU/acre-excluding roads & alleys): 3.52 Acreage of open space: 0.915 Percentage of useable open space: 5.64 (See Chapter 3, Article G. for qualified open space) Type of open space provided in acres (i.e., landscaping, public, common, etc): Common Lots with Landscaping Type of dwellir (s) proposed: a Single-family o Townhomes ❑ Duplexes o Multi -family Non-residential Project Summary (if ap�licable) i w Number of building lots: other lots: Gross floor area proposed: Hours of operation (days and hours): Existing (if applicable): Building height: Percentage of site/project devoted to the following: Landscaping: Building: Paving: Total number of employees: Maximum number of employees at any one time: Number and ages of students/children (if applicable): Seating capacity: Total number of parking spaces provided: Number of compact spaces provided: Authorization Print applicant name: Applicant signature: Phone: (208) 884- { Date:. O,w e ane, Suite 21 2 _9-1 a e 'rt &ian?' Idaho 83642 gFacsimile: (208) 588-6854 g Website: www.meridiand orii 2 rd ' � ��' '7 Incorporatcdr|C �OD u'�^ -�� /` --- - - - - ---------- Frontage improvements will be constructed in accordance with ACHD standards and include a 4 -foot detached, meandering sidewalk. The internal streets will have (4) four -foot detached sidewalks With an (8) eight -foot planter strip betvwen the sidewalk and back of curb. The project landscape plan shows trees, irrigation, and grass to e planted within the street side planter. The majority of the site naturally slopes from the southeast downward towards the northwest. Stormwater will be retained within drainage swales located within the public right-of-way and on Lot 6, Block 1. The project will include a pressure irrigation system that will be owned and operated by the Silversprings Homeowmers' Association. We are not requesting any variance from the MCC with this application. Covenants, Codes, anI Restrictions will be peepared arW recorded fbr this project at a future date. The Silversprings Subdivision will be a great addition to the City of Meridian and we are hereby requesting review and approval of the final plat. Please contact me at 2GB.867.3954 if you should have any questions or require any additional information regarding the project. 9= ErlOckson-Glivil, Inc., R o ffsr i n, P.IE. Project Manager A w� 0 �3 � � r �0� s ok Lt A , Ir c�� •riw f m 06 ell qpw jk ir �,� SUPAI R AVE qf Wit 06 -T j. I0 It -s .-• IIA � nl m {�1 r caFn x � mr Mlop- IF r — — I X 10! I f : re, Iq al I I VN NMAMM mwvs juvw to 0 ui L Gn G; c CL u z low Ln 14 f4 AMEW. 0 0 m W1 W10 - K X. 4A co C4, W1 SJL U- Kd u 4A d o N gy qm 1 Z ® LL2 LLO 6ol LU UJI LjU On 1A LL - LU P tj LU LULJJ oz < U L ftA z 0 ra m 6 0 1A 1 t MIS 0 ui V1 r4 CL z Un M W TLUot. 6 ,4* LU Ra Ir - ov oil K U- V) rx PL I a 0 w < 0 z z Luz 0 4A -k lu o gg, A# 0 15 r CIO U) in 'o w [ V - +rum Q `� , u Lm •®` 6 0. 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Yom+_ L =�z+tiia_ � C .�... } '� ' ;- JF :• L. 4: {C• •: n'gl- i� , + ' �'� t }��. ^•!4'E[ , M1 r }l!� � '}•'- - � stir v_ - r�J,4} L _•�v r�ri i �• . �4i �f8 �i '�'•� --'� F i fir. jv �, J ,,u` ' ��gigi,�F • �yL a� .. • i , •11 }} �•�f�lil r L � € i •,, _ k �rrte�*: yu�iy�,%.• a.% -P: t $ a •r '�' Y� ri'-' ? e t.!'�4' `- r ty Ub-! L-+- of r , y •* �+ .r _ it _ dif IL Vop a +� .ray. I� �� +ley .<. '�.•_ ef_ #_ rY � a �. L � ' E r �• ' .r}� r}'1 } II t h' F'IVr ' �.. .„ •,.y. •� � ._. •° �L 'moi .� .4- +�7` ' .1 _ •rt � v� �.. ire � ■ r -x - ^ iy f c �� ■ 1 4 File No.: FP -06-049 Project Name: Silversprings Subdivision Request: Final Plat approval for 29 single-family residential building lots and 4 common lots on 9.88 acres in an R-4 zone by Reed Kofoed. Location: 905 and 805 E. McMillan Road in the NE 1/4 of T. 4N., R. 1E, Section 31 . September 20, 2006 City of Meridian Planning & Zoning Department 660 E. Watertower Suite 202 AAeridian, Idaho 83642 RE: Silveirsprings Subdivision — Street CenteOline Certification Dear Sir/Madame, In accordance with the City of Meridian Public Works Subdivision Plan Review Checklist, Item No. 62, we are hereby certifying that the street finished center line elevations are set a minimum of three feet above the highest established normal groundwater elevation as determined in the Geotechnical and Groundwater investigation dated June 28, 2006 as prepared by Materials Testing & Inspection, Inc.. Please contact me at 208.288.1 992 if you should have any questions regarding the street grades or the highest established normal groundwater elevation. Vic, Ross Erick � Project Manager yi. Cm 42 FOR VALUE R#MPMD., Clem" nm. 4Ak �—&Pjft­ f3lAtd � —Zvxwiw. mft =3�_- 7ML. Wl. -n j. Gant, =to TLWYD Ho WUTHE=GH *WMAIM-M IN Husband and Wifivy Ix, wm*- nft il m rw ft" to-mt: Lot I Lot 2 in Crestwoocl Subdivisian No. 1. a poit-ion of 9fttidh 31,r Towaftip 41 North, R&*LF 1 9"t,, Boilke T1. Mridigme according to the, plot thmeoi'an file in theF =cords of the CcRmty Recorder of aft, Cc*mty, StAte Of It P'.d L IL TO HAVE AND TO PIP TWAd mtl 1t;ft unto their hihwmW famer. IN WITNMS WHEREOF, TlW GfWtOF4 PUMnt to A M*d= d Im Burd el Mid= bu coppowe --# to im hemm suu=m or: na 1pmclent � up wwjmuwom to uwsznxw by Im d& of JILnu#ry, 197 3 this7P _ V. .t IK WC �00 By CMXT W000,0 Im, JLl V1 A"*ras *bK P01MAM ddm iftft'Of MAO,, STATE Of ID HOr IL Covm (w ADA, cow" W.AAA.. 1A t I" d6l mg *MANOR 00tii WOW ie. a Howy Owl* no for 0 wAi u"Itol Was 110& Lp appmrsd RT D, GLAZMM kip" a of to Aat me- in ow em1w. md 4* &00)52� �vw 4 If DeWs At Par est i� IN'N't M WHNRXWI bave "bum am& *8-u; to YW k". f Oman*- -9. p go. dw rl �w tap #I jp"A S A 3IC-1 lrnrl�r MOR Its AP Li ORA ;I-, z yi. Cm 42 FOR VALUE R#MPMD., Clem" nm. 4Ak �—&Pjft­ f3lAtd � —Zvxwiw. mft =3�_- 7ML. Wl. -n j. Gant, =to TLWYD Ho WUTHE=GH *WMAIM-M IN Husband and Wifivy Ix, wm*- nft il m rw ft" to-mt: Lot I Lot 2 in Crestwoocl Subdivisian No. 1. a poit-ion of 9fttidh 31,r Towaftip 41 North, R&*LF 1 9"t,, Boilke T1. Mridigme according to the, plot thmeoi'an file in theF =cords of the CcRmty Recorder of aft, Cc*mty, StAte Of It P'.d L IL TO HAVE AND TO PIP TWAd mtl 1t;ft unto their hihwmW famer. IN WITNMS WHEREOF, TlW GfWtOF4 PUMnt to A M*d= d Im Burd el Mid= bu coppowe --# to im hemm suu=m or: na 1pmclent � up wwjmuwom to uwsznxw by Im d& of JILnu#ry, 197 3 this7P _ V. .t IK WC �00 By CMXT W000,0 Im, JLl V1 A"*ras *bK P01MAM ddm iftft'Of MAO,, STATE Of ID HOr IL Covm (w ADA, cow" W.AAA.. 1A t I" d6l mg *MANOR 00tii WOW ie. a Howy Owl* no for 0 wAi u"Itol Was 110& Lp appmrsd RT D, GLAZMM kip" a of to Aat me- in ow em1w. md 4* &00)52� �vw 4 If DeWs At Par est i� IN'N't M WHNRXWI bave "bum am& *8-u; to YW k". f Oman*- -9. p go. dw rl �w tap #I jp"A S A 3IC-1 lrnrl�r MOR Its AP Li ORA ;I-, 0 "- rid�M�--1cM WARRANTY DRED ; PW Vag cuotherich 4(;aLloyd nd Herrn 1 yn 4Wt1le,rich, husband and wife, * NIONWO, ! hasp tmt.M, 11 am �"v Oda f077 69' I EALOn lVato rerun and Audrid N t% r ~ . .�Y � n , husband d end wife, � t "N.sr . whvmmdr 8209 Ct S #7do4d Nis# MOW 93704 sit. f P -Or t Of Lot is Crft t`r+ood St divie,ion kb. 1, in S t ion 31 I 4X. R - JE . , B . N . Ad: County, Idaho, awrc perticul;rlyy c ribed Al f0110 : _ B-re�inninf this ter at corner of Lot 1; tt�ance . 89W 27" E. 3.V.�1a9t to S � 00 V0 00" V 631 59 fm t to a mint - t ncq S 89 &IM 12'' If . 331 10 fre t ra 9 point, nce M . 00'03'44" E 631 .92 feat to the 1ffr OFRBIGI DING _ ExclEptinj the EollowLng perce.l froom, #.aid Property: Part of Lot 1, CrCgt'%-ood Subdir►i.on Ho 1, in 5#coon 31 Iti,IE-. E -�- . �AAA County, Id,�ho, ire pe�rticu�;�gr].� de�erid144 - dd s ffollows: nnin t the Nor �t corner of Lot 1; thence S - pv*oa poi. V. 631.Et to 4 paint; thewe� S. 8904041200 it , 10.00 met to � Point; thenc�t: N - 00"'00000"l E 5 31.89 .t to a point; thane N . 89 "60 , 27.4 E 1Q . OQ - to thn i POINT OF SEGIRMT pC. 1 TO TIAVE AND 70 11OLn the % wlib Wit � their Wein __ Iar+erar. A teta the crud S. With � "m * %mbr A�MW t�Ade-pt E, ig fee4itjo f re c $Md UM t 0 WM WJU MEL Av4 iWaed tie X"e f16MC011 kW* dwm Mtei: Au ffumt 31. 1979. T .• , w/ LLOYD NUIHI+RICH - -- .. _.._ ..�. , . _ . fU1t�UL� tt'iiRIURI i -! ..' WARRANTY DRED ; PW Vag cuotherich 4(;aLloyd nd Herrn 1 yn 4Wt1le,rich, husband and wife, * NIONWO, ! hasp tmt.M, 11 am �"v Oda f077 69' I EALOn lVato rerun and Audrid N t% r ~ . .�Y � n , husband d end wife, � t "N.sr . whvmmdr 8209 Ct S #7do4d Nis# MOW 93704 sit. f P -Or t Of Lot is Crft t`r+ood St divie,ion kb. 1, in S t ion 31 I 4X. R - JE . , B . N . Ad: County, Idaho, awrc perticul;rlyy c ribed Al f0110 : _ B-re�inninf this ter at corner of Lot 1; tt�ance . 89W 27" E. 3.V.�1a9t to S � 00 V0 00" V 631 59 fm t to a mint - t ncq S 89 &IM 12'' If . 331 10 fre t ra 9 point, nce M . 00'03'44" E 631 .92 feat to the 1ffr OFRBIGI DING _ ExclEptinj the EollowLng perce.l froom, #.aid Property: Part of Lot 1, CrCgt'%-ood Subdir►i.on Ho 1, in 5#coon 31 Iti,IE-. E -�- . �AAA County, Id,�ho, ire pe�rticu�;�gr].� de�erid144 - dd s ffollows: nnin t the Nor �t corner of Lot 1; thence S - pv*oa poi. V. 631.Et to 4 paint; thewe� S. 8904041200 it , 10.00 met to � Point; thenc�t: N - 00"'00000"l E 5 31.89 .t to a point; thane N . 89 "60 , 27.4 E 1Q . OQ - to thn i POINT OF SEGIRMT pC. 1 TO TIAVE AND 70 11OLn the % wlib Wit � their Wein __ Iar+erar. A teta the crud S. With � "m * %mbr A�MW t�Ade-pt _@ p�r■�e rrwe [ ` Ylthor! ig fee4itjo f re c $Md UM t 0 WM WJU MEL Av4 iWaed tie X"e f16MC011 kW* dwm Mtei: Au ffumt 31. 1979. T .• , w/ LLOYD NUIHI+RICH - -- .. _.._ ..�. , . _ . fU1t�UL� tt'iiRIURI i -! ..' - - w• w�. w._...�..-'.. .� r. J • W4TV o�- IuAro COUNTY OP ADIXTATr. +► X79. w_.�•..� (W �. iY ofF17 ; cf er we ammy t'� In Md r*3 k� C"Wr � * am .oewd .t .4 LLOYD4UIHERICII XMLYN UMERICIi �t '� ` 'met"&AM. O _ "� t� is ;,,r +ice. ' ...--- --.. - 60"W" I w1. 'r W"A ax are �t vim■ fir= r - : . it w � • cows tm" I I W 0 454W %M4RUMMM IMM1 ��YIf fNQ tRiQY�i UM i�0 i � i i Title Rte No.: B96-37461 WAF ARAMW DMID FOR VALUEJIECBVED OL Wil K. WAW ri *d Norr T. Whpaiw, wife ,ead tuitband 20ZS-00#. 2 GRANTOR(e, dd6z(do) baby GRANT. BARGAIN, SELL jbd CONVEY unto: W. Lash Brinkerhoff and Donna J. 0Ankwlwff,, husbarW and wife ,t GRANTEES(M), who currbnt rd 1$: 805 E MplA Rd. . Mme. Id o 83642 tib folbw ng d;Acribid CdA prope*ty 1p Ada County; Std of Ids ho, more particularly described as folows, to wit: SEE EXHIBIT W ATTACHED (Cantinm•d) 9 6 0 3 9 6 6 0 ADA CO. RECORDER I DA r`ID NAVARRO BOISE ID 096 M Y 1 PPl 19 FEE DUJL new !lECORDED tsT THE REQUEST OF TO HAVE AND TO HOLD the srid Pmonfsrrl with thair:appu ,unto MAW Gr t��t�, �d Gr�nt�e(ei heirmGrgKand aeaiOnz forever. l the G tdr(#) d (do) h y cov&Mt to and with tha said GranteaU), that ori i� the awr y in . , p of a id than amid prmra vs am free from ell - rW'#; CEPT ttmwto wWch this conveyance in exprudy mGVWlhWMTftpWrWL dr!d um m e�ffii� d dq by the Grantaef s): arr�d subject to r ry . r trlctlon `gptx. dghts of wey and *gv*wn=ts.(if any) ° rd. A tlex . ,eta} t WW utility � . if y] f t! current Ye_, which wa.n�ot yet duewd payabis. and that Gratw(ol WN WW" end cFof w tie W from ;a in claims whsm. Dplt i�.41[ V 7. 1896 �1 / RW K. W . STAWE OF h1dw . Couw of Awa Qpthle 7th ity cd in theofI 998't br W M LNpwmqg pq ,ti.••■•�..�� omw fir �isld $ •. � K.1 WULWi lend Norris T. Wase* �` '• s e• r known Aria-atpor ldwa o no to hip On p�`sor � � G to - thin and ti. 1+1 olpVD R. t L My �mi�vn. : o7�olpe Boise ritle & Escrow. Inc. May f on •i F • 3HIBIT WAN SEE EXHIBIT "A" ATTACHED L EXHIBIT "A" $r� Part of Lot 1 of CRESTWOOD SUBDIVISION WO. 1, according to the official plat thereof, filed in Book 28 of Plats at Page 1757, records of Ada County, Idaho, -ppa~rticulerly described as follows: Beginning at the Northwest corner of Lot 1; thence North 89040127" Fast 330.42 feet to a point; thence South 00000100" Wtst 631.89 feet to a point; thence South 89040'1 West 331.10 feet to a point; thence North 00°03'44 East 631.92 feet to THE POINT OF BEGINNING. EXCEPTING the following parcel f rcm said property: Part of Lot 1 ■ CRES'1WOOD SUBDIVISION NO. 1. in Section 31., Township 4 North, Range 1 East, Boime Meridian, Ada County, Idaho more particularly described as follovis: 13 Beginning at the Northeast corner of Lot 1; thence South 000001000 Deet 631.89 feet to a point; thence South 8904011.2" west 10.00 feet to a point; thence North 00000000" East 631.89 feet to a point; thence North 89040127" East 10.00 feet to THE POINT OF BEGINNING. ff•� 41 F. A rpt �� D STATE OF IDAHO COUNTY OF ADA AFFIDAVIT OF LEGAL INTEREST 0 4#1 Ax AM ;�� � e) �� `t//(address) (city) (state) being first duly sworn upon, oaths depose and say: 1. That I am the record owner of the property described on the attached, and I grant my permission to: _ Ada (name) (address to submit tht apcomPanying application(s) pertaining to that property. 2. I agree to in mnify, defend ghd hold the City of Meridian and its employees harmless from any claim or liability resulting from any dispute as to�,V I the statements contained herein or as to the ownership of the property which is the subject of the application. 1�. 3. I hereby grant permission to City of Meridian star to enter the subject property for the purpose of site inspectiong: irelated to procesifing said application(s). : ' ODn� ._.of 0mated this 2O (Signatt=W"' SUBSCRIBED AND SWORN to before me the day and year first above written.. V U (9�aiy Pub1W for Idaho) EY A. . ,sI Residing at! _ • T A, • cJ� • My Commission Expires: 'A ' OF 10 fie IKL Ra AFFIDAVIT OF LEGAL INTEREST STATE OF IDAHO } COUNTY OF ADA } C/ F/7 bW) lh'r,* 1091A1,14 It/ (name) (address) fj6Q�,Z-P 7119Al (city) (state) being first duly sworn upon, oath, depose and say: i ti I. That I am the record owner of the property described on the attached, and I grant my permission to: �, { - n 4 Lie It ,III ��A] - f- --, - (name) (address) - to submit the accompanying application(s) pertandng to t4at property. 2. I agree to indemnify, defend and hold the City of Meridian and its employees harmless froa any claim or liability resulting from any dispute as to the statements contained herein or as to the ownership of tt Droperty which is the subject of theapplication. 3. I hereby grant permission to City of Meridian staff to enter the subject property for the purpose of site inspectiord related to procesging said application(s). �.l 7�1 Bated this day of 204 r (Silpmture) SUBSCRIBED AND SWORN to before me and year fust above tten. � NICHELLETRE Kota6W6Iic or Idaho} Notary Public F State of Idaho r Residing gt: M Commission E uses• �' x� Y �P -17 .... ......... ....... ..... .. .. .............. ... ....... .. . . ........ .. t. ..... ....... ......r - - - - - - - - - - - ..... ..... tr THE FOLM30MG "ISTWG - REETL:::m=ES 5 L APPEAR. I qy I PLAT: ?l E. MCIILLI A& N Ln N. LOCUST GROVE R 1:AZ A THE FOLLOWNG POSED STREET N, S ARE APPROVED- -"-E. COPPER RIDGE S GOLDWOO' Pj#%. 0 FiN. ;,NJ. SILVERSKY AV@u� THEj:OLLCWG;Pr, fREET MWS ARE MW > ...... ..... ®R NMI W. ADA COUNTY ENGINEER MERIDL4kN FIRE DEPARTMENT ADA COUNTY HIGHWAY DIS. ADA COUNTY SHERIFF Strog AMo%W aWt-- DATE DATE DATE Sliversprings Subdivision Drainage Calculations Design Critoft Storage Design Storm: Conveyance Design Storm: Water Quality Design Storm: Design Storm Duration 1 Myr (Retention Ponds & Swales 100 -yr (infiltration beds) 50 -yr (conveyance system; pipes, etc.) 54 -yr event 1 hr Peak flow rates were calculated for each sub -basin using the rational method (equation 1- 1). Storm rainfall intensities were derived from the 2 -year, 10 -year, 25 -year and 100 -year intensity duration frequency curves for Zone A using calculated times of concentration. The time of concentration was calculated for each sub -basin based on the runoff coefficient "C" as defined in the rational method peak flow rate equation, and the individual sub -basin slope and length (see equation 1-2). Q = OA (equation 1-1) where; Q = Peak Flow Rate (cfs) C = Runoff Coefficient (dimensionless) i = Rainfall Intensity (inches/hour) A = Drainage Area (acres) i.s(i.i -cam t� _ VS(equation 1-2) where; tc = Time of Concentration (minutes) C = Runoff Coefficient (dimensionless) D =Distance from Remotest Contributing Point (feet) S = Slope Along D The rational method for peak flow calculation assumes: 13 the rainfall occurs uniformly over the drainage area; 2) the peak rate of runoff can be reflected by the rainfall intensity averaged over a time period equal to the time of concentration of the drainage area; and 3) the frequency of runoff is the same as the frequency of rainfall used in the equation. El 9 t Baffin -1 Pretreatment: Storage: Hard Surface Pervious Surface (lots) Basin Area: Runoff Coefficient: Basin Length: Delta Z: Average Basin Slope: Time of Concentration: Intensity (2 -year): Intensity (25 -year): Intensity (50 -year): n 1,0@0 gal Sediment & Grease Trap Discharge to ACHD storm drain system on lot 6, Bloch 1 C -Value 21811 sgft 0.85 14@095 sgft 0.1 161, 906 sqft 0.20 rr#t 306.59 faet 2 ft 0.65% 32.67 min 0.55 in/hr Qp (2 -year): 0.41 cfs 1.2 in/hr Qp (25 --year): 0.9 3 cfs 1.4 in/hr Qp (50 -year): 1.05 cfs Basin -2 Pretreatment: 1,000 gal Sediment 8 Grease Trap Storage: Discharge to ACRD storm drain system on lot 6, Bieck 1 C -Value Hard Surface 26108 sgft 0.85 Pervious Surface (lots) 99522 sgft 0.1 Basin Area: 125,630 sgft Runoff Coefficient: 0.26 Basin Length: 494.64 feet Delta Z: 2.5 ft Average Basin Slope: 0.51 Time of Concentration: 42.42 min Intensity (2 -year): 0.48 in/hr Qp (2 -year): 0.35 cfs Intensity (25 -year): 0.95 in/hr Qp (25 -year): 0.70 cfs Intensity (50 -year): 1.2 in/hr Qp (50 -year): 0.89 cfs IK_ Basin -3 Pretreatment: Storage: Hard Surface Pervious Surface (lots) Basin Area: Runoff Coefficient: Basin Length: Delta Z: Average Basin Sbpe: Time of Concentration: Intensity (2 -year): Intensity (25 -year): Intensity (50 -year): 1,080 gal Sediment & Grease Trap Discharge to ACH D storm drain system on lot 6, Black 1 C -Value 22288 sgft 0.85 103535 sgft 0.1 1251821 sgft 0.23 260 feet 1 f 0.38% 34.61 min 0.55 in/hr Cep (2 -year): 0.37 cfs 1.1 in/hr [gyp (25 -year): 0.74 cfs 1.3 in/hr Cep (50 -year): 0.87 cfs .......... The target throat velocity design value is 0.5 Met through the baffles of the S&G trap. a a - is awl, R 2 • Basin S&G Trap Throat Area (sqft) 2 -yr Event Peak Flow, cfs Throat Velocity, ft/sw 112&3 1000 6.67 1.14 0.170 All of the S&G trap throat vebocities are near or below the 0.5 fVsec guideline. OEM SlIvemprIng's SubdIVIsIon, WArld"lan, Idaho Med"dIan, Idaho 100 -Year Recumnce Intwval UnIng ITD Zone A Chart -qotes: Pond Des#gn Volume does not include percolation through bottom 15% of bed volume increase for sediment storage 1461 cuf. kesign Retention Pond Volume = 11197 cuft 4 Percolat'lion TIM. I 'M 9 U"I POND 1 xis 8/7/2006 C -Value Hard Surface Area 70205 Sq. Ft. 0.85 Pervious Area (Lots) 343152 Sq. Ft. 0.15 Total Drainage Basin Area 9.49 Acres Run -Off Caefficient 0.27 Controlled Discharge Rate 0 cfs max. Storm Storm Run Off Run Off Discharge On -Site Duration Intensity Rate Volume Volume Storage (in/hr) cfs cu ft cu ft cu ft 5 PAn. 4.38 1118 . 3353 0 3353 1 30 Min. 1.73 4.41 ...... . ... . 71946 0 71946 1 Hr. 1.06 2.70 91737 0 91737 2 Hr. 0.61 1.56 111207 0 111207 6 Hr. 0.26 0 . 66 141330 0 14,330 161534 0 16,534 24 Hr. 0.081_.1 0.21., 18,298 0 1812 Rational Formula Q_CiA 15% of bed volume increase for sediment storage 1461 cuf. kesign Retention Pond Volume = 11197 cuft 4 Percolat'lion TIM. I 'M 9 U"I POND 1 xis 8/7/2006 %L�ab■ k An. p Maw h - W4;� 8 6 4 r. fl� :D 0 X k An. p Maw h - W4;� 8 6 4 r. fl� :D 0 X Of 1. w CL O. C/) Lij O. C) Z 0. Z U) 0. Z w F --- Z _j 0.0 0 .0 LL Z 0.0 0.0, w IMP 407 ZONE - A MINUTES HOURS LE -"OR DURATION f -4 4 FIGURE NO. FIGURE NO. f� ZONE A I P% 10. S. 6. 4. 2.1 Of 0 w 0.. 0 A Cl) w 0.( 77 -A z (1) O.. --e Z LLI F- z �� 0.01 O.OE LL z O.OE 0.04 Iii =.A iy MINUTES HOURS DURATION FIGURE NO. A' � m ly f7�15�� AP '3 l3`f.�/.i.,r G' 9 0 M w LLI C) Z z F- U) z w F - z 0. . MINUTES HOURS DPW, DURATION . ca, d Fy ■ FIGURE NO. 'r. silversprings sd Worksheet for Circular Channel Project Dencrip0on Prat File c: haestadlfmwlsilversp.fm2 Worksheet stormdrain Flow Element Circular Channel Method planning's Formula Solve For Discharge Input Data nnings Coefficient 0.009 Channel Slope 0.002200 ft/ft Results Discharge 7.12 cfe Flow Area 1.77 ft Wetted Perkwter 4.71 ft Top Width 0.37e-7 ft Critical Depth 1.03 ft Percent Full 100.00 Critical SkW 0.003276 ft0ft Velocity 4.03 ftls Velocity Head 0.25 ft Specify Energy 1.75 ft Froude Number 0.1 o Full Flow Capacity "ricies Full Fkxv Slope 0.002200 ftfft Flow is suhcritical. 08/07/06 Student Edition F ey v5.15 08:07:12 RY hWft9W NIjdhodsCInc. 37 Brgpk!6W, Road W*tethury, CT 06708 (203} 705-106 Ram 1 at 1 silversprings sd Worksheet for Circular Channel Prot description Project File c:lhaestadlfmwlsilversp.fm2 WorkSheiat stormdrain Flow Element Circular Channel Method Manning's Formula Solve For Discharge Input Data 1 Mannings Coefficient 0.009 Channel Slope 02200 ft/ft Depth ft Diameter in Results77i Discharge cfs Flow Area 0.79 ft2 Whiffed Perimeter 3.14 ft Top Width 0.3e-7 ft Critical Depth 0.67 ft Percent Full 100.00 Critical Slope 0.003501 ffflt Velocity 3.07 ft/s, Velocity Head 0.15 ft Specific Energy 1.15 ft Froude Number 0.11e-3 7RTNNity 2.41 cfs Full Flow Slope 0.002200 ft/it Flaw is subcritical. OM7X6 Stuo6nt Edifivn Fimmlrastar v8. 15 08:02:90 PM Has wtdd Mythoft Inc. 37 BrodkskJo Rawl VIbtarbury, CT Or>708 (203) 705-1P91P 1 of 1 1L MATERIALS TESTING & INSPECTION YI Fi K! U Environmental services Ll Geotechnical n in erin onstruction Materials Testing Q Special Inspections Prepared for: Silversprings Development, LLC 228 E. Plaza Street, Suite GI Eagle, Idaho 83616 f.idpp GEOTECHNICAL ENGINEERING REPORT of Silversprings Residential Subdivision 805 and 905 E. McMillan Road Meridian, Idaho MTI File Number 1360787g �9 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mti@mti-id.com • www.mti-id.com MATERIALS TESTING Fs' INSPECTION June 28, 2006 Page # 1 of 26 ❑ Environmental Services ❑ Geotechnical Engineering. ❑ Construction. Materials Testing ❑ Special Inspections rAboise12006 reports1600-7991b60787g1b60787g geotech.doc Mr. Reed Kofoed Silversprings Development, LLC 228 E. Plaza Street, Suite G1 - Eagle, Idaho 83616 (208) 938-2741 Ix Re: Geotechnical Engineering Report Silversprings Residential Subdivision ` 805 and 905 E. McMillan Road . Meridian, Idaho Mr. Kofoed: In compliance with your instructions, we have conducted a soils exploration and foundation evaluation for the above-mentioned development. Fieldwork for this investigation was conducted on 5 June 2006. Data have been analyzed to evaluate pertinent geotechnical conditions. Provided geotechnical, groundwater and construction recommendations are listed in the Table of Contents. Results of this investigation, together with our recommendations, are to be found in the following report. Often, because of design and construction details that occur on a project, questions arise concerning soil conditions. We would be pleased to continue our role as geotechnical engineers during project implementation. MTI also has great interest in providing 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 be pleased to meet with you at your convenience. rt We appreciate this opportunity to be of service to you, and we look forward to working with you in the _�L future. If you have questions please call us at (208) 376--4748. Respectfully Submitted, Materials Testing & Inspection, Inc. R Sonia Larrabee Re iewe Staff Geologist %I] Q�OQ�OFESS/0� KEVIN0- L. SCHRgEDER 964 � y 5ch"roeder;3P� ical Services Mana e tev wed y: L'8vT 4. 'a est 'dent f4rF O F 1�'Z► �� oAvr�9t� -&Wol Z 4ZFW_1 .E. e 1 Manager TFOF IDPt;�' 006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 ■ Fax (208) 322-6515 E -Mail mti@mti-id.com • www.mti-id.com MATERIALS -' TESTING & INSPECTION June 281, 2996 Page # 2 of 26 ❑ Environmental Services El Geotechnical Engineering C3 Construction Materials Testing El Special Inspections r:lboise12006 reports1600-7991b60787g1b60787g geotech.doc Copyright CV 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 ..d E -Mail mti@mti-id.com ■ www.mti-id.com TABLE OF CONTENTS INTRODUCTION......................................................................................................................3 ProjectDescription.................................................................................................3 Authorization .......................... .............................................. ....................3 .............. Purpose...................................................................................................................3 Scope......................................................................................................................3 Warranty And Limiting Conditions........................................................................4 General...................................................................................................................4 DESCRIPTIONOF SITE............................................................................................................5 SiteAccess..............................................................................................................5 GeneralGeology Of Area.......................................................................................5 Site Topography, Drainage And Vegetation..........................................................5 - F' Site Climatology And Geochemistry......................................................................6 eoselsmicSetting..... ........................ o_ ...... o -o ................................... __o ........... 0..6 SOILSEXPLORATION..............................................................................................................6 Exploration and Sampling Procedures...................................................................6 Laboratory Testing Program...................................................................................7 Soil And Sediment Profile.....................................................................................7 Soils Survey Review .............................................................................................. .7 VolatileOrganic Scan.............................................................................................8 SITEHYDROLOGY..................................................................................................................8 GeneralNotes.. .......... .... o ................... .... o ............................. 8 Groundwater...........................................................................................................8 SoilInfiltration Rates.............................................................................................8 FOUNDATION AND PAVEMENT DISCUSSION AND RECOMMENDATIONS.................................9 GeneralNotes........ .... o ................ o o. o o o ............................... o . o . o ......... o... o .............. 9 Foundation Design Recommendations... o .................................. o . o o o ... o . o o .............. o..9 Crawl Space Recommendations.............................................................................19 Recommended Pavement Sections.........................................................................10 CONSTRUCTION CONSIDERATIONS.........................................................................................11 Earthwork DryWeather... ....... o. o.. o. o .......................... o-o--oo ... o ... o ---o ....... o ...... _-oo ............. ........ 12 WetWeather...... .... o ...... ........................ o ........... ...... o ...................... o..o .......... oo...12 SoftSubgrade Soils..............................................................................................12 FrozenSubgrade Soils... ...................... o ................. o ................. o ................. ........ 13 StructuralFill..........................................................................................................13 Backfill.. ....... o ............. o ............... 0 ................ 0.0 ........................................ o_ ....... o .... 14 Excavations............................................................................................................14 GroundwaterContro I..............................................................................................14 GENERALCOMMENTS..... ........... o ........... 0 .................. 0..00..0 ............... o ................... ............. 5 REFERENCES........................................................................................................................16 LIST......................................................................................................................17 ■APPENDIX Geotechnical General Notes...................................................................................18 Unified Soil Classification ........................0..................0..........0.0.0.0..........0.............. 19 TestPit Logs. ....... ............. 0 ................. 00..0 ....... 0 .......... o ...... ........................ 20 Copyright CV 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 ..d E -Mail mti@mti-id.com ■ www.mti-id.com - "N MATeRIALS June 281, 2006 TeSTING & Page # 3 of 26 .�INSPeCTION El Environmental Services El Geotechnical Engineerin2 L3 Construction Materials Testing it Inspections rA oise 0 reports\600-799\b6O787g\b6O787g geotech.doc INTRODUCTION This report presents results of a geotechnical investigation and analysis in support of data utilized in design Fy of structures as defined in the 2003 International Building Code (IBC). Information in support of groundwater and stormwater issues pertinent to the practice of Civil Engineering is included. Observations VN and recommendations relevant to the earthwork phase of the project are also presented. Project Description: 1040. The proposed development is located southwest of the City of Meridian, Ada County, Idaho, and occupies a portion of the NE'/4 of Section 31, Township 4 North, Range I East, Boise Meridian. The project will consist of development of 25 single-family residential lots on an approximate 10 -acre site. Roadways are anticipated to be included as part of the development. Proposed grading is presently undetermined. Authorization: Authorization to perform this exploration and analysis was given in the form of written authorization to proceed from Mr. Reed Kofoed to Sonia Larrabee of Materials Testing and Inspection, Inc. (MTI), on 30 May 2005. Said authorization is subject to terms, conditions, and limitations described in the Professional Services Contract entered into between Silversprings Development, LLC and MTI. Our scope of services for the proposed development has been provided in our proposal dated 21 April 2006 and again below. Purpose: The purpose of this Geotechnical Engineering Report is to determine various soil profile components and their engineering characteristics for use by design engineers and/or architects in: • Preparing or verifying suitability of foundation design and placement, • Preparing site drainage designs, and • � Indicating issues pertaining to earthwork construction. Scope: .Ali The scope of this investigation included review of geologic literature and existing available geotechnical studies of the area, review of available environmental reports, visual site reconnaissance of the immediate site, subsurface exploration, field and laboratory testing, and an engineering analysis and evaluation of foundation materials. The scope of work did not include design recommendations specific to individual residences. h. F r Copyright 6 2006 Materials Testing & Inspection, Inc. 2791 South VictoryView Way ■ Boise, I D 83709 • y X208} 37s-4748 Fax (208) 322-6515 E -Mail mti@mti-id.com 0 www.mtkid.com �? MATGRIALS June 28, 2006 , Page # 4 of 26 INSPOECTION 13 Environmental Services El Geotechnical Enqineerin2 El Construction Materials Testing cil Inspections rA oise 006 reports1600-7991b60787g1 60787g geotech.doc Warranty And Limiting Conditions: Field observations and research reported herein are considered sufficient in detail and scope to form a Freasonable basis for the purposes cited above. MTI warrants that findings and conclusions contained herein have been promulgated 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. t r These engineering methods have been developed to provide the client with information regarding apparent or potential engineering conditions relating to the subject property within the scope cited above and are necessarily limited to conditions observed at the time of the site visit and research. The report is also limited to information available at the time it was prepared. In the event additional information is provided to MTI following the report, it will be forwarded to the client in the form received for evaluation by the client. There is andistinct possibility that conditions may exist which could not be identified within the scope of the investigation or which were not apparent during the site investigation. This report was prepared for the exclusive use of Silversprings Development, LLC and their retained design consultants ("Client"). Conclusions and recommendations presented in this report are based upon agreed-upon scope of work outlined in the report and Contract for Professional Services between Client and Materials Testing and Inspection;-, Inc. ("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 otherarties as to accuracy or completeness of this report or suitability of its use by such other parties for purposes whatever, known or unknown to Client or Consultant. Neither Client nor Consultant shall have ' liability to, or indemnifies or holds harmless third parties for losses incurred by purported actual or use or misuse of this report. No other warranties are implied or expressed. General: Revisions in pians and or drawings to the proposed development from those enumerated in this report should be brought to the attention of the soils engineer to determine if changes in foundation recommendations are required. Deviations from noted subsurface conditions if encountered during construction, should also be brought to the attention of the soils engineer. 'Y" 6 Awl > Copyright 0 2005 Materials Testing & Inspection, Inc. 2791 South VictoryView Way ■ Boise I D 83709 2 • y � 08} 37fi-4748 Fax (208) 322-6515 E -Mail 4 mti@mti-id.com • www.mti-id.com MR MATERIALS lune 28, 2006 TESTING & Page # 5 of 26 INSPECTION 0 Environmental Services Q Geotechnical Engineering El Construction Materials Testing Q Special Inspections r:l oie re o s - 1 7 7 eotec o I - DESCRIPTION OF SITE Site Access: Access to the site may be gained via Interstate 84 to the Eagle Road exit. Proceed north on Eagle Road approximately 3 miles to its intersection with East McMillan Road. From this intersection, proceed west 1 mile to 805 and 905 East McMillan Road. Presently the project site exists as two rural residential parcels, each with pastureland and associated outbuildings. A residence is located in the northwest corner of each parcel. The location is depicted in site map plates included in the Appendix. General Geology Of Area: The subject site is located within the Boise Valley, which is directly underlain by a thick sequence of alluvial sands and gravels typically deposited on basalt formations. These sediments are loosely named the Boise River Gravels and were deposited as river floodplain and stream overwash from the Boise River. These gravel deposits tend to have imbricated well-rounded clasts, poor sorting and crude stratification of beds of gravel and lenses of cross --bedded sand suggesting deposition in braided channels. The Boise River Gravels consist of unconsolidated clay, silt, sand, gravel, and cobbles. These gravels have been subdivided into smaller units based on their age and are exposed as distinct alluvial terraces. Five of these terraces are well exposed in the Boise area and range in age from Middle Pleistocene to Holocene (Recent) (0 -- 0.9 million years ago). The site lies on the Whitney Terrace, the second terrace above the currently defined floodplain. Geologic data published for the area indicated that bedrock is typically encountered at a depth of approximately 100 feet beneath the soil surface (Othberg and Stanford, 1992). Site Topography, Drainage And vegetation: The proposed development consists of two parcels that total approximately 10 acres of relatively flat land. Each parcel has a residence located in the northwestern portion of the property with irrigated pastureland in the southern portion of the property. The surface exhibits fine grained soils throughout the majority of the site. The parcel is bounded on the north East McMillan Road, by a residential subdivision on the south and west, and by a rural residential property on the east. Regional drainage is north and west toward the Boise River. Stormwater drainage for the site is achieved by percolation through surf cial soils. No stormwater drainage facilities are located in the vicinity of the site, and the area does not receive significant off-site drainage. Vegetation throughout the area consists primarily of irrigated pasture grasses as well as mature trees and shrubs. Copyright 0 2005 Mat6rials 'Nesting & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mti@mti-id.com a www.mti-id.com � 1 rMATERIALSTeSTING & #IINSPECTION June 281. 1 .*e#%ge # ! of 6 Ll Environmental Services El Geotechnical Engineering C3 Construction Materials Testing Q Special Inspections Site Climatology And Geochemistry: Average precipitation for the region is on the order of 10 to 12 inches per year. Temperatures range from 20° F to 91' F with extremes ranging from -4° F to 102° F. In spring, average wind speed is approximately 11 miles per hour with a prevailing direction from the southeast. Soil in the area is primarily derived from ,w siliceous materials and exhibits low electro -chemical potential for corrosion of metals or concretes. Local w aggregates are generally appropriate for portland cement and lime cement mixtures. The Idaho State Transportation Department (ITD) has adopted anionic asphalt cements. The pH of surface water, groundwater, and soil in the region typically range from 7 to 9. No indication of abormal geochemical conditions was noted on site. Frost penetration is generally on the order of 6 inches with extremes ranging to 3 feet. Geoseismic Setting: Soils on --site are classed as Site Class D in accordance with Chapter 16 of the 2003 edition of the IBC. Building structures on this project should be designed as per the IBC requirement for such a seismic classification. Our investigation did not reveal potential hazards resulting from earthquake motions: slope instability, liquefaction, and surface rupture because of faulting or lateral spreading. Incidence and anticipated acceleration of seismic activity in the area is low. SOILS EXPLORATION Exploration And Sampling Procedures: The field exploration to determine engineering characteristics of subsurface materials included a r reconnaissance of the project site and investigation by test pit. Test pit sites were located in the field by means of visual approximation from on-site features or known locations. Upon completion of investigation each test pit was backfilled in with loose excavated materials. These loose areas need to be re -excavated and compacted prior to constructing structures over them. Samples were obtained from representative soil strata encountered in test pits. Samples obtained have been • ■visually classified in the field by an engineer.. or geologist, identified according to test pit number and depth, placed in sealed containers and transported to our laboratory for additional testing. These materials have *' 'been further described -min detail on loprovided in the Appendix. Results of field and laboratory tests are logs p PP rY also presented on these logs. It is recommended that these logs not be used for estimating quantities because of highly interpretive results. Copyright 4 2006 Materials Testin1p & Inspection, Inc. 2791 South Victory View Way * Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mti 0 m#i-id.com www.mti-id.com T�1% 4.1 NO .X4 :4L At !S MATERIALS TESTING F� INSPECTION M June 28, Vii, Q Environmental Services Q Geotechnical Engineerino LJ Construction Materials Testing — C3 Special 12�pections rAboise 006 rePorts\600-799\b6O787g\b6O787g geotech.doc Testing Program: Along with the field investigation, a supplemental laboratory testing program was conducted to determine additional pertinent engineering characteristics of subsurface materials necessary in analyzing the behavior of the proposed structures. Laboratory tests were conducted according to current applicable American Society for Testing and Materials (ASTM) 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 Tests - ASTM designation D 4318, Grain Size Analysis -- ASTM designation C 117, C 136, and Resistance R -Value and Expansion Pressure of Compacted Soils -- ASTM designation D 2844. Soil And Sediment Profile: A total of four test pits were advanced to depths of 16.0 to 16.5 feet across the site. Because of the areal extent of the studied parcel, the developed soil profile represents only a generalized case, and variations between test pits should be anticipated: Lean Clay (CL) ivz Dark brown to brown, dry to slightly moist, stiff to very stiff, lean clay soils were observed at ground surface across the site. Fine-grained sand was observed throughout the clay soils, with organic material present generally within the upper 8 inches. Lean clay soils were noted at the ground surface to depths of 4.2 feet bgs. Silty Sand (SM) -- Light brown to brown, slightly moist to moist, loose, silty sand sediments were observed in test pits 1, ,,2, and 3 underlying the clay horizon. Fine to coarse-grained sand was observed throughout the silty sand sediments, and a weak to moderate calcium carbonate cemented layer was noted at depths generally from 1.3 to 5.6 feet bgs. Silty sand sediments were noted at the depths of 1.3 to 5.7 feet bgs. Silty Gravel (GM) — Brown to red brown, moist, silty gravel sediments were observed under the silty sand horizon in test pit 3 and under the lean clay horizon in test pit 4. Fine to coarse-grained sand and fine gravels of up to 1 inch in diameter were present within this sediment type. Silty gravel sediments were noted at to depths of 5.6 to 6.3 feet bgs. Poorly Graded Gravel (GP) - Brown, slightly moist, poorly -graded gravel sediments were observed at depth in all test pits. Fine to coarse-grained sand, cobbles of up to S inches in diameter, and boulders up to 14 inches in diameter were present within this sediment type. Poorly -graded gravel sediments extended through the termination depths of all test pits. Walls of each test pit were stable with the exception of those through native granular sediments. Excavations through granular sediments soils will have a propensity for sloughing or caving. Soils Survey Review: A review of the United States Department of Agriculture, Soil Conservation Service, Soil Survey of Ada County Area, Idaho, 1980, indicated that the site could be characterized by Purdam-Power silt loam. Purdam-Power silt loam soils occur on low alluvial terraces. Specific soils characteristics, as defined by the Copyright 0 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mti O mti-id.com • www.mti-id.com MATERIALS TESTING & INSPECTION June 28, 2006 Page # 8 of 26 ❑ Environmental Services ❑Geotechnical Engineering ❑Construction Materials Testing El Special Inspections rAboise12006 reports1600-7991b60787eb60787g geotech.doc USDA, for Purdam silt loam, 2 to 4 percent slopes include moderately slow permeability above the hardpan to very slow permeability through hardpan, very slow runoff, and slight erosion hazard. 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'contamination. No groundwater was encountered. SITE HYDROLOGY General Notes: Existing surface drainage conditions are defined in the Description of Site. Information provided in this section is limited to observations made at the time of the investigation. Regional and/or local ordinances may require information beyond the scope of this report. Groundwater: Groundwater. was not encountered within the depths explored during the field investigation. Soil moistures in the test pits were generally moist within the surficial clay and dry to slightly moist. Groundwater levels in the site vicinity are controlled in large part by residential and commercial irrigation activity and canal leakage in the local area, and are likely at their maximum elevations during the irrigation season. Estimation of seasonal groundwater fluctuation is problematic without regular monitoring. Based on the evidence of this investigation, and background knowledge of the area, it is unlikely that groundwater will be encountered during construction and is anticipated to remain, at depths of greater than 16 feet below the ground surface throughout the year. This depth is an estimate and should be confirmed by periodic monitoring of the piezometers installed in all test pits. MTI is available to perform monitoring, if desired. R+ Soil Infiltration Rates: tol, ; Soil permeability is a measure of the ability of a liquid to move through a soil and was not tested in the field. However, pipes for possible percolation testing were installed in all test pits. In this report this parameter is approximated by soil type and gradation. Of soils comprising the generalized soil profile for this study, lean clay soils generally offer little permeability, with typical infiltration rates less than 2 inches per hour. Silty sand soils have typical infiltration rates between 2 to 8 inches per hour and calcium carbonate cementation encountered within this layer may reduce this value to near zero. Silty gravel sediments typically exhibit infiltration rates between 6 to 18 inches per hour. Poorly graded gravel sediments exhibit infiltration values in excess of 24 inches per hour, and percolation testing is typically not required within these soils as a result of their free -draining nature. Copyright b 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 a (208) 376-4748 • Fax (208) 322-6515 E -Mail mti@mti-id.com * www.mtkid.com i r MATeRIALS June 28, 2006 TESTING & Page # 9 of 26 r Fy INSPECTION ❑ Environmental Services ❑ Geotechnical Erigjneerinq ❑ Construction Materials Testing ❑ Special Inspections I rAboise12006 reports1600-7991b6Q787g\b60787g geotech.doc A All infiltration facilities constructed on-site should be extended into native sandy gravel sediments. Excavation depths of approximately 6 feet should be anticipated to expose sandy gravel soils. In addition, because of the high permeability, ASTM C 33 filter sand, or equivalent, should be incorporated into design 01 g of infiltration facilities. An infiltration rate of 8 inches per hour should be used for design. 7 ivxxx recommenus that a uaiiriea eotecnnica� engineer,, en ineerin-e-technician or buildin official y verif the bearin soil suitabilit for each structure n- the time of construction. FOUNDATION AND PAVEMENT DISCUSSION AND RECOMMENDATIONS General Notes: Presently, approximately 26 lots are proposed for the project site. Considering typical residential construction, and subsurface conditions, it is recommended that the structures be founded upon conventional spread footings and continuous wall footings. The following,recommendations are not s ecific to the individual structures but rather should be viewed as guidelines for the subdivision wide development. Foundation Design Recommendations: On the basis of data obtained from the site and test results from various laboratory tests performed, MTI recommends following guidelines be used for the net allowable soils bearing capacity. ASTM D 1557 Net Allowable Soils FootingDepth Sub rade Com action BearingCapacity Footings must bear on competent, native, cementdd silty sand soils or compacted structural fill. Existinglean clay soils must be completely Not Required for y p etely . removed from below all foundation elements.' Native Soil z 1,500 Ibslft Excavation depths ranging from 1 to 5 feet bgs o . should be anticipated to expose proper 95 �� for Structural Fill p p p pe bearing sor s. I-MRry-r - _ J li_ J ■o&" 7 a Footings should be proportioned to meet the stated bearing capacity and/or the IBC 2003 minimum requirements. Total settlement should be limited to about 1 in ' ch with differential settlement of y approximately 112 inch.F-Objectionable soil types encountered at the bottom of footing excavations should be I removed and replaced with structural fill. Excessive/ loose or soft areas that are encountered Y at footing F subgrade will require over -excavation and backfilling with structural fill. To minimize effects of slight differential movement that may occur because of variations in character of supporting soils, and in seasonal Zh 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 Prade. F F'I Copyright 0 2006 Materials Testing & InspIction, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mtu@inti-id.com- www.mti-id.com hL MATERIALS TESTING & INSPECTION June 28, 20OF-4 Page # 10 of 210 Q Environmental Services Q Geotechnical EngineeriM 0 Construction Materials Testing 0 Special Inspections r;l vise 0 reports\600-799\b60787g\b60787g geotech.doc Crawl Space Recommendations: Considering the presence of shallow cemented soils across the site, all residences constructed with crawl spaces should be designed in a manner that will inhibit water in the crawl spaces. Therefore, proper grading should be considered to be critical. MTI recommends that roof drains carry storm water at least 5 feet away from each residence, and grades should be greater than 5% 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. Recommended Pavement Sections: MTI collected a sample of near --surface soils for R -value testing representative of soils to depths of 1 foot below existing ground surface. A bulk sample, collected from the northeastern portion of the 905 East McMillan Road parcel, consisted of lean clay (CL) soil with fine grained sand. This sample yielded an R value of 9. As required by Ada County Highway District, MTI has used a traffic index of 6 to determine necessary pavement cross-sections for the site. Additionally, MTI has made other assumptions for traffic loading variables based on the character of the proposed construction. The Client should review these assumptionso make sure they reflect intended use and loading of pavements both now and in the future. Flexible Pavement Sections The Idaho Method as defined in Idaho Department of Transportation's Materials Manual (section 500) was = used to develop the pavement section. Ada County Highway District (ACHD) parameters for traffic index and substitution ratios were also used in the design, and were obtained from ACHD's Development Policy Manual. Calculation sheets provided in the Appendix indicate the soils values, traffic loading, and material ratios used to calculate the pavement sections. MTI recommends that all materials used in the construction of Asphaltic Concrete Pavements meet the requirements of the Idaho Standards for Public Works Construction (ISPWC) specifications. Construction of the pavement section should be in accordance with these specifications. The following thicknesses are MINIMUM THICKNESSES for assured pavement w function. ?z 1 IPM Aggregate Base . Structural Subbase ent Sgction Com onent Drivewa s and Parking, Residential Streets As altic oncrete rw 2.5 Inches ntreated Aggregate Base 4.0 Inches nular Borrow 12.0 Inches ECom acted Subgrade Not Required Material complying with ISPWC Standards for Crushed Aggregate Materials. Any material complying with the requirement for granular structural fill (uncrushed) as defined in ISPWC. Copyright Q 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way * Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mti@mti-id.com * www.mtkid.com 41 MAT6RIALST =STING & iINSPGCTION June 28,, 11 El Environmental --- Servi-ces -- - --------------------- Cl --Geotechnical E ' Q Construction Materials Testing El Special Inspections rAboise12006 reports\600-799\b6O787g\b6O787g geotech.doc Common Pavement Section Construction Issues The subgrade upon which above pavement sections are to be constructed must be properly stripped, inspected, and proof rolled. Proof rolling of subgrade soils should be accomplished with a heavy rubber - tired fully loaded tandem axle dump truck or equivalent. MTI anticipates that pavement areas will be subject to moderate traffic. It should be noted that surficial clay soils _may tend to pump if near to and above optimum moisture contents. Pumping or soft areas must be removed and replaced with structural fill Fill material and compacted native subgrade soils (if required) in support of the pavement section as well as ti. aggregates comprising the pavement section must be compacted to not less than 95% of maximum dry density indicated by ASTM D 698 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, compaction of that material shall 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. 1. CONSTRUCTION CONSIDERATIONS Earthwork; Recommendations in this report are based upon structural elements of the project being founded on competent native clay -silt -sand mixtures or compacted structural fill. Structural areas should be stripped to an elevationat exposes these soil types. Excessively organic soils, deleterious materials, and/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 ecommendedthat organic and/or disturbed soils, if encountered, be removed to depths of 1 foot (minimum), and wasted or stockpiled for later use. Stripping depths should be adjusted in the field to assure that the entire root zone and/or disturbed zone (plow depths) and/or topsoil are removed, prior to placement and compaction of structural fill materials. Exact removal depths should be determined during grading operations by a qualified geotechnical representative, and shall be based upon subgrade soil type, composition, and firmness or soil stability. Identified underground storage tanks (UST), below surface utilities, wells, or septic systems must be decommissioned, removed or abandoned as deemed necessary by governing Federal, State, and local agencies. Excavations developed as the result of such removal must be backfilled with structural fill materials as defined below. After existing subgrade soils are excavated to design grade, proper control of subgrade conditions (i.e., moisture content) and placement and compaction of new fill (if required) should be overseen by a representative of the soils engineer. Recommendations for structural fill presented within 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 Copyright V 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, 1D 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mt[Q mti-id.com • www.mti-id.com MATERIALS TESTING & INSPECTION June 281, 0' f r _ f f - El Environmental Services ---------------- -- C3 Geotechnical -Engineering El Construction Materials Testing _EJ Special Insp2ctions rlboise12006 reports1600-7991b60787 1b6O787g geotec . oc 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 and/or irrigation 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 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. 'Vet weather: If construction is to be conducted during what is considered "Wet" seasonal conditions (commonly from mid-November to April), problems associated with soft soils must be considered as part of the construction plan. Duringthis 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 ofadrying 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 WE iv under construction traffic. During periods of wet weather, construction may become very difficult if not I. impossible. The following recommendations and options have been included for dealing with anticipated 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. ■ 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 and/or disked to a `" Copyright 6 2006 Materials Testing & Insp&ction, Inc. 2791 South Victory View Way • Boise, l D 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mti@mti-id.com • www.mti-id.com MATERIALS tiTESTING & yINSPECTION June 281, '0 Page, 13 of 26 C3 Environmental Services El Geotechnical EngineerinQ LJ Construction Materials Testing El Special Inspections depth of 1 % 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. Y� • 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. Structural Fill: Soils regarded as suitable for use as structural fill are those classified as GW, GP, SW, and SP in accordance with the Unified Soil Classification System (USCS) (ASTM D 2487). Use of silty soils (USCS designation of GM, SM, and ML) as fill may be acceptable. However, these materials require very high moisture contents for compaction and require a long time to dry out if natural moisture contents are too high. 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 5 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 fit materials, those classified as GW, GP, SW, 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) and 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 footing for a distance equal to the thickness of fill between ' the bottom of foundation and underlying soils, or 5 feet, whichever is less. r k: Each layer of structural fill must be compacted to a minimum density of 95 percent of maximum dry density as determined by ASTM D 1557 (for rigid structures) or D 69,x$ (for flexible pavements). The"ASTM D 1557 and D 698 test methods 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 the maximum density or "break over" point. The number of required passes should be used as the requirement on the Copyright 0 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 ■ (208) 376-4748 ■ Fax (208) 322-6515 E -Mail mti@mti-id.com • www.mti-id.com iMAT6RIALS June 28,, 200TeSTING & Page# 14 of 2INSPIECTIONIJ Environmental Services Ll Geotechnical Engineering Q Construction Materials Testing 0 Special Inspections rAboise12006 reports1600-7991b60787 tb60787g geotech.doc remainder of fill placement. Material should contain sufficient fines to fill all void spaces, and must not contain more than 50 percent oversize particles. Backfill: AW Backfill materials must ascribe to the requirements of structural fill except that the maximum material size should be 4 inches. In no case should material greater than 2 inches in diameter bear directly on structural elements. Placing oversized material against rigid surfaces interferes with proper compaction. Backfill should be compacted in accordance with the specifications for structural fill, except in those areas where it is kv)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 may be 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 excavations within these soils should be constructed at a maximum slope of 1'/z foot horizontal to 1 foot vertical (1 V2H: IV) for excavations up to 20 feet in he] ght. 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 our 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. For dee excavations native anular soils cannot be expected to remain in position. These materials are prone p � �' p p to failure and may collapse, thereby, undermining upper soils layers. This is especially true when working at depths near the water table. Proper care must be taken to protect personnel and equipment. Additionally, care must be taken that excavations are properly backfilled in accordance with procedures outlined in this report. water and loose debris should be removed from excavations prior to placement of fill soils or concrete. Shallow soil cementation (caliche) was observed throughout much of the site and may cause difficulties during foundation development and utility placement. Cemented soils should be anticipated throughout depths of 1 to 6 feet bgs. Groundwater Control: Groundwater was not encountered in the investigation and is anticipated to be below the depth of most construction. However, special precautions may be required for control of surface runoff and/or subsurface seepage. It is recommended that runoff caused by wet weather be directed away from open excavations. Silty or clayey soils may become soft and pump if subjected to excessive traffic following periods of wet weather. Ponded water in construction areas should be drained through methods such as trenching, sloping, Copyright Q 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way ■ Boise, ID 83709 ■ (208) 376-4748 a Fax (208) 322-6515 E -Mail mti@mti-id.com • www.mti-id.com MAT6RIALS June 28, 2006 � TESTING & Page # 15 of 26 INSPECTION ❑ Environmental Services ❑ Geotechnical Engineering ❑ Construction Materials TestinQ ❑ Special Inspections ' rAboise12006 reports1600-7991b60787g\b60787g geotech.doc crowning grades, nightly smooth drum rolling, or installation of a French drain system. Additionally, temporary or permanent driveway sections should be constructed if extended wet weather is forecasted. GENERAL COMMENTS When plans and specifications are complete or if significant changes are made in the character or location of the proposed development, consultation with MTI should be arranged as supplementary recommendations may be required. It is recommended that suitability g compaction of sub rade soils and action of structural fill p materials be verified prior to placement of structural elements. Additionally, monitoring g and testing should be performed to very that suitable materials are used -for structuralsifill■ n p verify a d that proper placement and compaction techniques are utilized. �5 I- P_ w Copyright Q 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, I D 83709 • (208) 376-4748 * Fax (208) 322-6515 E -Mail mti@mti-id.com • www.mtkid.com T MATERIALS June 21 200 r Page # 16 of 26 TiESTINCi & i - INSPECTION iti Environmental Services El Geotechnical En2ineeri.nq U Construction Materials Testing Special Inspections rAboise12006 reports\6@0-799\b6O787g\b6O787g geotech.doc REFERENCES American Society for Testing Materials, 1999, Standard Test Method for Materials Finer than 75 -gym (No. 200) Sieve in Mineral Aggregates by Washing: C 117 - 95, 3 p. American Society for Testing Materials, 1999, Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates: C 136 - 96a, 5 p. F American Society for Testing Materials, 1999, Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils, ASTM Designation: D 4318 - 86, 11 p. Collett, R.A., 1980, Soil Survey of Ada County Area, Idaho: US Department of Agriculture, Soil Conservation Service, 327 p. .- Othberg, I.L. and Stanford, L.A., 1992, Geologic Map of the Boise Valley and adjoining area, Ada and Canyon Counties, Idaho: Idaho Geologic Map Series, scale 1:100,000. 9! 1 Copyright Q 2006 Materials Trstingk & Inspection, Inc. A 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 1 E -Mail mti@mti-id.com • www.mti-id.com 5_1W June 283 2006 MATGRIALS TeSTING & Page# 17 of 26 iii INSP6CTION !0i Q Environmental Services E3 Geotechnical Engineering Q Construction Materials Testing U Special Inspections r:\boise\2006 reports\600-799\b6O787g\b6O787g geotech.doc 01 APPENDIX GEOTECHNICAL GENERAL NOTES UNIFIED SOIL CLASSIFICATION SYSTEM ),GEOTECHNICAL TEST PIT LOGS PAVEMENT THICKNESS DESIGN SHEETS SITE MAP PLATES 1� Copyright (A 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way o Boise, I D 83709 * (208) 376-4748 * Fax (208) 322-6515 E -Mail mti@mti-id.com * www.mti-id.com M Am MATERIALS June 281 2006 TeSTINra & Page# 18 of 26 IN INSPECTION Environmental Services LJ Geotechnical Engineering,Construction ri ITesting Special _Inspections L GEOTECHNICAL GENERAL NOTES SOIL PROPERTY SYMBOLS N: Standard "N" penetration: Blows per foot of a 140 -pound hammer falling 30" on a 2" D.D. SS. Qu: Unconfined compressive strength, tonslft2 Qp: Penetrometer value, unconfined compressive strength, tonslft2 Qc: Cone Penetrometer value, unconfined compressive strength, pounds/int V: Vane value, ultimate shearing strength, tons/ft2 M: Water content, % LL: Liquid Limit PI: Plasticity Index NP: Non -Plastic D: Natural dry density, lbs/ft3 SVT: Apparent groundwater level (at time noted after completion). DRILLING AND SAMPLING SYMBOLS SS: Split -Spoon - 1 318" I.D., 2" D.D., except where noted. ST: Shelby Tube - 3" D.D., except where noted. AU: Auger Sample. DB: Diamond Bit. CB: Carlaide Bit. GS: Drab Sample. RELATIVE DENSITY AND CONSISTENCY CLASSIFICATION Non -Cohesive Soils Standard Penetration Cohesive Soils Standard Penetration ' Resistance Resistance Vea Loose <4 Very Soft <2 Loose 4-10 Soft 2-4 Medium Dense 10-30 Firm Medium Stiff) 4-8 Dense 30-50 Stiff 8-15 Ve Dense X50 Very Stiff 15--30 Hard X30 PARTICLE SIZE Boulders 12 in. + Coarse Sand 5 mm to 0.6 mm Silts 0.074 mm to 0.005 mm Cobbles 12 in. to 3 in. Medium Sand 0.6 mm to 0.2 mm Clays 0.005 mm & Smaller Gravel 3 in. to 5 mm Fine Sand 0.2 mm to 0.074 mm Copyright ® 2006 Materials Testing & inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 a (208) 376-4748 • Fax (208) 322-6515 E -Mail mti.@mti-id.com ■ www.mti-id.com i It MAT6RIALS June 28, 2006 TeSTIN6 & Pa # 19 of 26 INSPIECTION 74 El Environmental Services LJ Geotechnical Engineering C1 Construction Materials Testing L3 Special Inspections rAboise\2006 reports\600-799\b6O787g\b6O787g qgeotech.doc Major Symbol Soil Descriptions Divisions Well -graded gravels, gravel -sand mixtures, little or no fines Gravel GW and Poorly -graded gravels, gravel -sand mixtures, little or no fines Gravelly GP Soils Silty gravels, Poorly -graded gravel -sand-silt mixtures <50% GM coarse fraction Clayey gravels, Poorly -graded gravel- -c ixtures passes #4 sieve GC Coarse Well -graded sands, gravelly sands, little or no fines Grained Sand SW Soils and Poorly -graded sands, gravelly sands, little or no fines <50% Sandy SP passes #200 sieve Soils Silty sands, Poorly -graded sand -gravel- silt mixtures coarse fraction Clayey sands, Poorly -graded sand -gravel -clay mixtures r,passes #4 sieve SC Inorganic silts & very fine sands, silty or clayey fine sands, silts ML clayey silts Inorganic clays of low to medium plasticity, gravelly clays, sandy and Clays CL cl, silclUs, lean cl4ys Fine LL < 50 Organic silts and organic silt -clays of low plasticity Grained OL Soils !m1norganicssilts, micaceousnor diatomaceous fine sand or silt >50% silts MH passes and Inorganic clays of high plasticity, at clays #200 sieve Clays CH LL > 50 Organic silts and clays of medium -to -high plasticity OH Highly Organic Soils Peat, humus, hydric soils with high organic content PT ■ Copyright (5 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mti,@mti-id.com • www.mti-id.com MATERIALS June 28, 2006 T T6STING & Page ft 20 of 26 INSPIECTION U E nvi ron mental Services U Geotechnical Engineering C) Construction Materials Testing Q Special Inspections ■ rAboise\2006 reportsN600-799\b6O787g\b6O787g geotech.doc D( (F b O.0 1.3 5.4- GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log #: TP -1 Date Advanced: 6/5/2006 Logged by: Sonia Larrabee Excavated by: JTS Excavation Location: See Site Map Plates Depth to Water Table: Not Encountered Total Depth: 16.5 Feet bgs Notes: Piezometer installed to 16.5 feet bgs. J Copyright if 2006 Materials Tostiqg & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mti@mti-id.com • www.mti-id.com MATGRIALS June 28, 2006; T INSPLCCTION Page # 21 of 24, eSTING & Q Environmental Services El Geotechnical Engineering Q Construction Materials Testing U Special Inspections 1W r:lboise12006 reports1600-7991b64787g\b64787g geotech.doc GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log #: TP -2 Date Advanced: 6/5/2006 Excavated by: JTS Excavation Depth to Water Table: Not Encountered Notes: Piezometer installed to 16.0 feet bgs. Logged by: Sonia Larrabee Location: See Site Map Plates Total Depth: 16.0 Feet bgs Depth Feet Field Description and Sample Sample Depth Lab USCS Soil and Sediment Qp b s e Classification Type (Feet bgs} Test ID Lean Clay (CL): Dark brown to brown, dry to slightly moist, stiff to very stiff, with fine-grained sand. -4.2 --Organic material to 8 inches bgs. GS 0.5-1.0 1.75-2.25 A -- Weak calcium carbonate cementation from 1.6 0 4. Z eet bgs. Silty Sand (SM}: Light brown to brown, dry to 4.2-5.4 isfrghtly moist, loose, with fine to coarse-grained sand. Poorly -Graded Sandy Gravel (GP): Brown, slightly moist, loose to medium dense, with fine 5.4-15.0 to coarse-grained sand, 8 -inch minus, imbricated, alluvial cobbles, and 14 -inch minus alluvial boulders. Lab Test ID M LL PI Sieve Analysis - % - - #4 #10 #40 #100 #200 A 11.5 38 11 100 100 98 92 83.7 .IIIIIIIIIJI �.Copyright Q 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way * Boise, ID 83709 * (208) 376-4748 • Fax (208) 322-5515 E -Mail mti.@mti-id.com • www.mti-id.com 2) 9. June ' '! MAT6RIALS Page # 22 of 26 TeSTING & INSPECTION U Environmental Services U Geotechnical Engineering U Construction Materials Testing U Special Inspections rAboisel2 6 reports1600-7991b60787 Ib60787g geotech.doc GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log #: TP -3 Date Advanced: 6/5/2006 Excavated by: JTS Excavation Depth to Water Table: Not Encountered Notes: Piezometer installed to 16.1 feet bgs. Logged by: Sonia Larrabee Location: See Site Map Plates Total Depth: 16.1 Feet bgs Depth (Feet Field Description and Sample Sample Depth Qp Lab USCS Soil and Sediment Classification Type (Feet bgs) Test ID bgs) Lean Clay (CL): Dark brown, moist, soft to stiff, 0.0-5.6 with fine-grained sand. GS 0.5-1.0 0.75-1.25 B --Organic material to 10 inches bgs. Silty Sand (SM): Light brown to brown, dry to slightly moist, loose to medium dense, with fine to 2.6-5.7 coarse-grained sand. --Weak calcium carbonate cementation from 5.2 to 5x4eet ks.. Silty Gravels (GM): Brown to red brown, moist, 5.7-6.2 loose, with fine to coarse-grained sand and 1 -inch minus gravel. Poorly -Graded Sandy Gravel (GP): Brown, moist, loose to medium dense, with fine to coarse - 6.2 -16.1 grained sand, 8 -inch minus, imbricated, alluvial cobbles, and 14 -inch minus alluvia[ boulders. Lab Test ID M LL PI Sieve Analysis - % - - #4 #10 #40 #100 #200 B 1 23.1 1 42 14 100 100 97 90 81.7 Copyright Q 2006 Materials Testing & Inspection, Inc. 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mtioOmtkid.com • www.mti-id.com June 28, 2006 MATeRIALSPage TeSTING & El Environmental Services Q Geotechnical Engineering 0 Construction Materials Testina Q Sr)ecial InsDections GEOTECHNICAL INVESTIGATION TEST PIT LOG Test Pit Log #: TP -4 Date Advanced: 6/5/2006 Excavated by: JTS Excavation Depth to Nater Table: Not Encountered Notes: Piezometer installed to 16.2 feet bis. Logged by: Sonia Larrabee Location: See Site Map Plates Total Depth: 16.2 Feet bgs Depth (Feet Field Description and P Sample P Sample Depth P P QP Lab bgs USCS Soil and Sediment Classification Type (Feet bgs) Test ID Lean Clay (CL): Dark brown to red brown, slightly moist, very stiff, with f ne to medium -- 0.0-4.0 grained sand. CS 0.5-1.0 2.25-2.5 C -'Organic material to 8 inches bgs. Silty Sand (SM): Light brown to brown, dry to sightly moist, loose to medium dense, with f ne to 4.0-5.6 coarse-grained sand. --Weak calcium carbonate cementation from 4.7 to 5.2fget bgs. Silty Gravels (GM): Brown, slightly moist to 5.6-6.3 moist, loose, with fine to coarse-grained sand and 1 -inch minus gravels. Poorly -Graded Sandy Gravel (GP): Brown, slightly moist, loose, with fine to coarse-grained 6.3-16.2 sand and 8 -inch minus, imbricated, alluvial cobbles. Lab Test ID M LL PI Sieve Anal is % - - #41196 #10 #40 #loo #200 C 14.7 40 13 98 85 77 70.4 Copyright! 2006 Materials Tdsting & Inspection, Inc. 2791 South Victory View Way * Boise, ID 83709 ■ (208) 376-4748 • Fax (208) 322-6515 E -Mail mti@mti-id.com • www.mti-id.com 5 { MATERIALS June } 2006 Tes7l"INIG & Page # 24 of 26 INSPECTION El Environmental Services 1 Q Geotechnical ErIgineering Ll Construction Materials TestingSpecial Inspections r:\boise\2006 r sl - 1 7 7 e ec o IDAHO METHOD - PAVEMENT THICKNESS (USING ADA COUNTY HIGHWAY DISTRICT SUBSTITUTION RATIOS Pavement Section Design Location: Proposed Silversprings Subdivision Average Daily Traffic Count: 100 All Lanes & Both Directions Design Life: 20 Years Traffic Index: 6.00 Climote I,�ctor: 1 R-V#lue of Subgrade: 9.00 Subgrade CBR Value: -- Subgrape Mr: - R -Value of Aggregate Base: 80 4.00 1.10 R -Value of Granulki- Borrow: 60 Subgradr R -Value: 9 Expansion Pressure of Subgrade: 0.33 Unit Weight of Base Materials: 130 Total Design Life 18 kip ESAL's: 33,131 ASPHALTIC CONCRETE: Gravel Equivalent, Calculated: 0.384 Feet Thickness: 4.196923077 Use �K 0.208 Flet Gravel Equivalent, ACTUAL: 0.4I CRUSHED AGGREGATE BASE: Gravel Equivalent (Ballast): 0.768 (if only aggregate base is to be considered change B 14 to B 15) Thickness: 0.329 Use = 0.33333333 Fret Gravel Equivalent, ACTUAL: 0.772 GRANULAR BORROW: Gravel Equivalent (Ballqlt): 1.747 Thickness: 0.975 Use = 1 Feet Grsi,wel Equivalent, ACTUAL: 1.772 TOTAL Thickness: 1.541 Thickness Required by Exp. Pressure: 0.366 This number must be less than TOTAL Thickness Design (ACHD Values) Depth Substitution Copyright 0 2006 Materials Testirig & Inspection, Inc. 17 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mtilDmti-id.com- www.mti-id.com Inche■ Ratios Asphaltic Concrete (pt least 2.5): 2.50 1.95 (ACRD minimums: 2.5 for lwal & 3 for art./collector) Asphalt Treated Baso Oat least d.2): 0,00 Cemdht Trq#ted ligse (at lest 4.2): 0.00 Untreirted lkggrega!! Base (at NWt 4.2): 4.00 1.10 Granular Borrow (pat least 4.2): 12.00 1.00 Copyright 0 2006 Materials Testirig & Inspection, Inc. 17 2791 South Victory View Way • Boise, ID 83709 • (208) 376-4748 • Fax (208) 322-6515 E -Mail mtilDmti-id.com- www.mti-id.com I re Ell MATERIALS June 281, 2006 T INSPeCTION Page # 25 of 26 oESTING & 0 Environmental Services 0 Geotechnical Engineerina El Construction Materials Testing .0 Special Inspections rAboise12006 reports1600-7991b60787g1b60787g geotech.doc RESISTANCE 11R11 VALUE LABORATORY TEST DATA Source and Description: TP -2 1'-2' — Sandy Lean Clay Date Obtained: July 31, 2003 Sample ID: FSa 1357 I -mpfing and Preparation: ASTM D75: X AASHTO T2.- AASHTO T87: ASTM.D421: I X Test Standard: , ASTM D2844: AASHTO T 190: Idaho T8: X Sample A B C .Dry Density lb/ft 3) 93.7 89.9 86.4 Moisture Content (%) 23.9 26.2 27.1 Expansion Pressure _(psi) 0.81 0.33 0.18 Exudation Pressure (psi) 336 231 152 R -Value 17 15 13 18.0 16.0 14.0 12.0 350 R -Value @ 200 psi Exudation Pressure = 14 R -Value @ Exudation Pressure 300 250 200 Exudation Pressure (psi) OrfArT 0 V4 Copyright 9 2006 Materials Testing & Inspection, Inc. 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