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HomeMy WebLinkAboutTask Order No. 0572a with Hydro Logic for Well 22 EvaluationTASK ORDER NO. 0572a CITY OF MERIDIAN (OWNER) =1 HYDRO LOGIC, INC. (HYDROGEOLOGIST) This Task Order is issued by Owner and accepted by the Hydrogeologist pursuant to the mutual promises, covenants and conditions contained in the Agreement between the above named parties dated February 18, 2007. CITY OF MERIDIAN MUNICIPAL WATER SUPPLY WELL NO. 22 EVALUATION PURPOSE The Hydrogeologist's scope of services, time of completion and compensation shall be as set forth herein. Services shall generally be described as Hydrogeologic Consulting Services per the Consultant's proposal dated September 23, 2010. The City of Meridian recognized in 2002 that the steel casing used in its municipal supply wells was prone to corrosion and associated with water quality problems such as staining and encrustation. City Well #24 was the first water well completed using PVC plastic well casing in July of 2002. Nine of the City's supply wells have now been constructed with PVC casing. Since the change in well casing materials, it has become apparent that the City was correct in its assessment of the corrosion problems with steel well casings and in the last three years, Wells #17 and #14 have had to be reconstructed and lined with PVC casing because of corrosive break -through (holes) of the steel casings after as few as 9 years of use; an expensive and difficult task. Although the City took pre-emptive action to address the observation of premature casing failure, it now needs to look back at its wells completed prior to the use of PVC to evaluate for corrosion to take preventative actions if accelerated corrosion is observed. Hydro Logic, Inc. has observed that Well #22 has many characteristics, such as drilling method, bentonite seal material, and groundwater geochemistry, as other wells showing casing corrosion. Additionally, Well #22 is now the same age that Well #17 was when its corrosion was discovered. The City has asked HLI to develop a scope of work to evaluate Well #22 during the fall of 2010 so that the well can be back on line before the high water demand season for 2011 is here. TASK 1.1 — CITY WATER WELL NO. 22 EVALUATION Per the City's request, Hydrogeologist will: 1) review previous down hole television surveys of the well, 2) place protective sheathing as needed on the building and roof to prevent damage, 3) tarp inside walls and protect well head plumbing as needed, 4) Inspect the removed pumping plant for wear/corrosion, 5) clear the water column and video inspect the 10 -year-old well, 6) design cleaning program, 7) develop bid schedule, obtain quotes, and engage drilling contractor, 6) oversee and direct the contractor's work, 9) video inspect the cleaned casings and well screens, and 10) develop a brief technical memorandum to the City with conclusions and recommendations. Other deliverables would be a copy of the well videos on compact disk and several down -hole still photographs of the inside of the well showing before and after. The Owner will provide all available information necessary to conduct the evaluations and develop submittals. Hydrogeologist will perform field surveys for evaluations and will serve as the liaison between the drilling contractor and the City to obtain cost estimates from contractors and to develop contractual agreements and technical specifications for the work. Hydrogeologist will inspect all tools to be inserted in the well prior to insertion. Hydrogeologist will ensure that all instruments, tools, cables, water tanks, hoses, and equipment used in the well are disinfected and cleaned (including heating of pipe and pumps that cannot be properly disinfected by other means. Hydrogeologist will develop any necessary change orders to the work and keep the City regularly updated with respect to the work. Hydrogeologist will also serve as inspector for the City with respect to the work including review of contractor invoices. The Hydrogeologist's scope of work and general approach to the project is described in detail in Attachment A. Hydrogeologist will work closely with the City's Public Works Department and the City's Water Department with regular e-mail updates. TIME OF COMPLETION Hydro Logic, Inc. can commence this work on the day after City approval. The contractor portions of the work will require two -to -three weeks at the outside. A goal of having the technical memorandum with recommendations completed within a month is reasonable. COMPENSATION The Not -To -Exceed amount for this Task Order No. 0572a is thirteen thousand, three hundred and sixty-one dollars without any contingency fee ($13,361). The hourly rates for services and direct expenses is attached (Geotechnical Services Spreadsheet - Attachment B) and by this reference made a part hereof. CITY OF MERIDIAN BY: r W (,T?5i-PLkec1]1�511V6 M.C.,-\Z, Attest: N / �, .JAYCEE HOLMAN, CITY CLERK HYDROGEOLOGIST ED SQUIRESJ HYDRO LOGIC, INC. HY40 tcblc� TAC 1002 W. Franklin Street, Boise, ID 83702 (208) 342-8369, (Fax) 342-3100, hydrologic@gwest.net September 24, 2010 Attachment A. Mr. Clint Worthington, P.E. Staff Engineer Public Works Department City of Meridian 33 East Broadway Avenue Suite 200 Meridian, Idaho 83642 Geotechnical Evaluation, Testing, and Inspection Services for the City of Meridian's #22 Municipal Supply Well Dear Clint: I have developed a scope of work, and estimated costs to work with the City on the evaluation and inspection of the City's #22 supply well. The well was constructed just short of 10 years ago and has had the same pumping plant with no well maintenance over that time period. Of especial concern to the City is the observed occurrence of severe corrosion of steel well casings in the Meridian area and that at least two of the City's water supply wells have required expensive reconstruction within the last three years that might have been avoided (or at least made easier and less expensive) by an earlier diagnosis. Beyond the primary reason for evaluation of the City's steel cased wells, it is generally recognized that rehabilitative maintenance of water supply wells is best carried out on a 5 -to -10 year frequency owing to improved redevelopment results and lower costs of redevelopment by not waiting until a significant reduction in capacity does occur. Additionally, the City does not want to repeat the interruption to major well production in an unplanned way during peak demand season when most breakdowns occur and when it is more difficult to schedule contractors. It is our experience that the encrustation that forms on the inside wall of the steel casing promotes corrosive breakthrough if left alone. In any case, it behooves the City to attempt to identify the contributing factors to this corrosion by study and detailed observation and to take steps as necessary to avoid expensive reconstruction of wells. It has been our continued experience that wells in service for this length of period will have significant encrustation of the inside walls of the steel casing that will preclude inspection for corrosion until the casings are cleaned. Indeed, it is under the thickest nodules of encrustation that the most extensive corrosion appears to occur. Our general approach is "hands-on" with concerted efforts to: 1) prevent damage to the existing infrastructure, 2) to ensure disinfection of all tools, instruments and equipment to be used in the well, 3) to prevent the occurrence of iron bacteria, 4) to secure and prevent down hole damage to the well, 5) to document procedures, and 6) to obtain the best value for the City from its contractors and consultants. By following these procedures for the last 15 years, we have not observed iron bacteria or any other bacterial problems in Meridian's wells even though these problems are common in the other Valley municipal systems. I have tabulated the costs to complete the work as a single project on the attached spreadsheet. The cost estimates are considered maximum amounts and I would recommend a 15 percent contingency owing to the inherent unknowns of subsurface work and older well construction. We stand ready to continence the work right away and to proceed continuously to completion of the project without interruption. The following narratives correlate with the spreadsheet tasks to explain, in more detail, the scope of work. 1 Review Existing Data and Site Visit Measurements Existing hydrogeologic data, hydraulic test results, the details of well construction, videotapes, field notes, and groundwater geochemistry will be reviewed and evaluated. This task includes a site visit to measure non -pumping water level and perform a short drawdown test. These data will be plotted and used as baseline data to compare to the original pump -testing and specific -capacity of the well and, also, to gage the effectiveness of any recommended re -development procedures. This review will allow a performance evaluation of the installed pumping plant. ($ 1,153) 2 Protect Building and Facilities Over the years, we have realized that protecting the pump house buildings during well maintenance and pulling/installing pumping plants is far more cost effective than having to repair damages after the fact. The heavy and long well tools and inexact controls on well rigs generally cause damage not too mention staining from lubricants, bailed materials, etc. Because the tools must be inserted and withdrawn through the roof hatch, there is much opportunity to damage the asphalt shingle roof, metal siding, and block exteriors. On the inside of the building, the existing plumbing, wall paint and controls are easily damaged and soiled without basic preventative measures that are easy to effect. We have not had any damages since implementing these procedures several years ago. Cost includes removal of sheathing at the end of the project ($ 2,733) 3 Quote, Schedule, and Oversee Pumping Plant Inspection, Rebuild, and Re -install A quotation will be obtained from pump contractor to inspect and, if necessary, refurbish the existing pumping plant. HLI will also inspect the pumping plant as it is removed from the well. Depending on the condition of the plant, recommendations for sale, storage, or rebuilding/maintenance of the pump will be developed. We feel it is important to have an independent inspector (HLI) to directly inspect the condition of the plant and to direct the contractor. ($ 1,058) 4 Conduct Comprehensive Video Inspection of the Well This includes a thorough underwater video inspection of the entire inside wall of the well including casing and screens prior to any work on the well. Arrangements will be made to clear the water column to ensure the best picture. The videotape will be reviewed, copied, and submitted to the City with a complete set of field notes, down hole still photographs, and a short one -to -two page memorandum of observations. Pre -inspection is an essential task in any well evaluation prior to any work to 1) be able to design the most appropriate cleaning program without damage to the well, 2) to avoid any liability issues from pre-existing conditions, and 3) because such an inspection is vital to understanding the down hole conditions for the long term development of the City's well maintenance program ($1,103). 5 Design and Specify Cleaning Techniques. Based on review of the video inspection and well construction, HLI will specify an appropriate well cleaning program to convey to the well contractor and from which to develop a bid schedule of work. ($ 415) 6 Develop Bid Schedule and Engage Drilling Contractor. A bid schedule will be developed and quotes obtained from the appropriate experienced contractors. Costs will be obtained from the most qualified candidate for all possible scenarios so that prices are not developed during the project. Sketches of effective and non -damaging tools will be developed, discussed with the contractor, and inspected by HLI prior to insertion in the well. ($1,375) 7 Oversee and Direct the Field Work, Re -Testing, and Clean Up HLI will remain in daily contact with the drilling contractor and make site visits as deemed necessary. This task includes the scheduling, oversight, and documentation of the contractor's work including site visits, tool measurements and disinfection, documenting materials and hours, and obtaining samples of scrapings from the well for potential analysis. The cleaning program and/or down hole tools may be adjusted or changed based on actual encountered conditions. Containment of bailing, mud, etc will be looked after and the site kept as clean as possible. Final clean up to pre-existing conditions will occur at the end of the project. Appropriate disinfection of all tools and equipment will be a priority. Great attention will be given to the security of the open well and site throughout the project. The disinfected pumping plant will be re -installed in the sterilized well and a short pumping test conducted to compare to the baseline test data. Weekly project updates will be made to the City by e-mail. ($ 2,948) 8 Conduct Video Inspection of the Cleaned Casing and Screens Immediately following the cleaning, a comprehensive side -viewing and axial -viewing video inspection will be conducted of the inside wall of the well. Special attention will be paid to areas of juxtaposed dissimilar metals, welded joints, the tailpipe and other areas of the well that have been shown over time to be vulnerable to corrosion. Survey will verify nothing was dropped into the well and that no damage was imparted to the well. Again, disinfection of all down hole equipment, cameras, well tapes, and the well itself will be looked after as necessary. ($ 1,478) 9 Develop Technical Memorandum With Documentation A short technical memorandum will be developed describing the accomplished work with conclusions and recommendations. Deliverables include a compact disk of the video surveys, field notes, water level measurements and down hole still photographs for the City's files. ($ 1,100) Respectfully submitted by: Edward Squires Hydro Logic, Inc. 00 t pp F- V iy � vv sNs vi vi cNy vi v9 +�—i 414 c G A m o to 64tp p `sn r)V�1 O u] � sa 69 h 0 i sMci o4 59 6CD 9 4 9 4A N fio9 fie6� 9 kn fie INr U � �. a W � b o o O ,n C Cl1 = H N H N h 'S H C yr c ti C V cq N N Q '~ O O y V ++ V m S W C a..l 69 N kn s U H A y o O� 4. N rr C ul 'O N 00 00 O vi G y •SIt DO M �r U «y. a •' y L Op�D N N 1� �O N 00 M a C a 0 Q 8 O W •y � Fr C N 9 v � i1. •vii 'O op NN 6 5 .5 a s� ��l U N M 'C' V'1 `D N 00 ❑ O+ ���QQ V i urpv • vx w Ed Squires From: Ed Squires Sent: Friday, September 24, 2010 9:43 AM To: Clint Worthington Cc: Kyle Radek Subject: 9-24-2010 City of Meridian Well #22 Evaluation Task Order, Scope of Work, and Cost Estimate Importance: High Attachments: 9-24-2010 City of Meridian Well #22 Evaluation Task Order and Supporting Documentation.pdf roLOSIC. The - 1002 W. Franklin St. Boise, ID 83702 (208) 342-8369 Fax: X208) 342-3100 Cell: (208)_631-6781 Clint: Attached to this transmission is the Task Order and supporting information for the planned Meridian Well #22 supply well evaluation for your review and use. If you find everything in order and wish to hire Hydro Logic, Inc. to carry out this project for the City, please reply and I will forward a signed original. Similarly, if you have questions or suggested edits, do not hesitate to call and I can make any changes you wish. You will note a slight cost increase over the Well #20-B and Well #21 evaluations and this is due to: 1) We keep re -using the thick protective plywood panels over and over again to the City's cost benefit (and we store these panels when not in use at no charge to the City) and we have been successful at that. However, over time they do wear out and need replacement and we need to purchase 10 replacement panels going forward. 2) There are a few details about the Well #22 evaluation that differ with some minor labor increases. 3) We have gotten better and found additional details of the work that have added slightly to the work. However, we have been under budget for the last few evaluations and we will strive to keep that record going. Even so, we agree it is better to have some buffer in the budget than to have to go make changes later. If the work is more straightforward than anticipated, the City's costs for our services will be less. Thank you for asking us to provide a quotation to perform this work for the City. Respectfully, Ed Squires 9/24/2010