Loading...
HomeMy WebLinkAboutTask Order No. 0711A with Hydro Logic for Well 18 Evaluationi ~~%~E IDIAN Public ~ DA H O • Works Department TO: Mayor Tammy de Weerd Members of the City Council FROM: Kyle Radek, P.E. Assistant City Engineer DATE: 12/8/2009 Mayor Tammy de Weerd {ity Council Members: Keith Bird i3red Hoaglun Charles Rountree David Zaremba SUBJECT: CONSENT AGENDA ITEM FOR NEXT AVAILABLE COUNCIL MEETING: TASK ORDER 0711A WITH HYDRO LOGIC FOR WELL #18 EVALUATION PER MASTER AGREEMENT DATED FEBRUARY 18, 2007 FOR AN AMOUNT NOT TO EXCEED $11,583. I. RECOMMENDED ACTION A. Move to: 1. Approve the task order for Well #18 Evaluation with Hydro Logic, Inc. in an amount not to exceed $11,583 and; 2. Authorize the Mayor to sign the agreement II. DEPARTMENT CONTACT PERSONS Clint Worthington, Staff Engineer (Project Manager) Kyte Radek, Asst. City Engineer Warren Stewart, PW Engineering Manager Tom Barry, Director of Public Works r~ 489-0349 489-0343 489-0350 489-0372 Page ! oj3 • III. DESCRIPTION A. Background The City has recognized that the steel casing used in: wells prior to 2002 is prone to corrosion and associated water quality problems. In the .last three years, Wells #1'7 and # 14 have had to be reconstructed and lined with PVC casing because of corrosive break-through of the steel casings after as few as 9 years of use. The City is taking a preventative approach to steel casing wells and evaluating their condition after 10 years of use. This evaluation aides in an earlier diagnosis of corrosive breakthroughs which results in lower costs of reconstruction and increased water quality. Eight of the City's wells since 2002 have been constructed with PVC casing to eliminate the problems due to corroding steel casings. B. Proposed Project This project is for the evaluation of Well #18. Well #18 was constructed with a steel casing 11 years ago and has been observed to have many of the same characteristics as Well # 17 which had to be reconstructed after 9 years. ;7 IV. IMPACT A. Strate ig c Impact: This project meets our mission requ-remen#s to indentifiy and prioritize work to anticipate, plan and provide public services and facilities that support the needs of our growing community and ensure modern reliable facilities while maintaining tinancialstewardship. This project is in line with our preventative approach of evaluating steel casing wells at ten year intervals. These evaluations allow for the early diagnosis of corroded casings which in tum limits service interruptions and reduction in capacity. Early diagnosis also decreases cost of rehabilitation efforts. B. ServicefDelivery Impact: Evaluation of Well #18 gives knowledge of its current condition and allows for rehabilitation before potential breakdowns and reductions in capacity. Rehabilitation (if needed) reduces service interruptions to customers and cost once breakdowns occur. C. Fiscal Impact: Project Costs Consultant Agreement $11,583 Page l of 3 ]Pro'ect Fundin ]Enterprise Fund for Well Assessment $40,fl00 V. ALTERNATIVES A. T'he City could defer the evaluation of Well #18 and risk reductions in capacity, service interruptions, and costly breakdowns B. The City could choose not to evaluate Well #18 which would result in the same risk of reductions in capacity, service interruptions, and costly breakdowns. VI. TIME CONSTRAINTS Council's approvat will allow far the evaluation during the off peak demand season where the well can be temporarily offline without service interruptions. • VII. LIST OF ATTACHMENTS A. Consultant Agreement Approved for Council Agenda: ~ "~"~~~ ~t~ f to Page 3 of 3 TASK ORDER N0.0711a CITY OF MERIDIAN (OWNER) AND HYDRO LOGIC, INC. (HYDROGEOLOGISTj This Task Order is issued by Qwner 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. IS 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 December 7, 2009. 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 02. Eight 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 co ect in its assessment of the lowered quality of off-shore steel 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 Zook 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 #18 has many characteristics, such as drilling method, bentonite seal material, and groundwater geochemistry, as Well #17 which recently had to be reconstructed. Additionally, Well #18 is only ane year older than Well #17. The City has asked HLI to develop a scope of work to evaluate. Welf #1$ during the winter of 200912010 after the high vaster demand season is past: TASK 1.1 -CITY WATER WELL NO. 18 EVALUATION Per the City's request, Hydrogeologist will: 1) conduct ashort-term hydraulic test of the equipped well as baseline data for specific capacity and far comparison to the original specific capacity, 2) review previous down hole television surveys of the well, 3) place protective sheathing as needed on the building and roof to prevent damage, 4) tarp inside walls and protect well head plumbing as needed, 5) schedule and oversee removal of the pumping plant and have it inspected for wear/corrosion, 6) clear the water column and video inspect the 10-year-old well, 7) design cleaning program, 8) develop bid schedule, obtain quotes, and engage driller, 9) oversee and direct the contractor's work, 10) video inspect the cleaned casings and well screens, and 11) 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 a-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. 0711 a is eleven thousand, five hundred and eighty-three dollars without any contingency fee ($11,583). 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 HYDROGEOLOGIST BY: Cc c n . 2~-~.--_ ~ ED SQUIRES, YDRO L GIC, INC. Char-~; c !'Z vurtiu, ~c,-~.~ ~~° Attest: ,,.~~y O~ MCI®q '%. ~~ ~ ti '% ,~ C~' ~GOR~~ rFa ~~; J CE OLMAN, CITY CLERK ~]~i ~j, ~~ w°~ ~ O O ~o ~~G ~n~ 1002 W. Franklin Street, Boise. ID 83702 {2081342-8369. (Fax~342-3Id0, hydrolog~c~c ~gwestnet • December 7, 2009 Attachment A. Mr. Kyle Radek. P.E. Pubiic 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 #18 Municipal Supply Well Dear Kyle; I have developed a scope of work, and estimated. costs to work with the City on the evaluation and inspection of the City's #18 supply well. The well was constructed 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 wi-thin the last two 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- 0-10 year frequency owing to improved redevelopment results and lower casts of redevel pment by not waiting until a significant reduction incapacity does occur. Additionally, a 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 Qccurrence 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 1 S 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 1 S Here nit contingency owing to the inherent unknowns of subsurface work and older well construction. We stand ready to commence 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 Conduct Short Pumping Test 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 conduct a short draw down test of the well, measure non- pumping water level, and to document field-measured water chemistry parameters. These data will be 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- developmentprocedures. This pumping test will allow performance evaluation of the installed pumping plant. ($ 778) 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 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 {$ 1,783) 3 Qnote, Hire, Schedale, and Oversee Pumping Plaat Removal and Inspection A quotation will be obtained from pump contractor and arrangements made to remove, transport, and store the existing pumping plant. Depending on the condition of the plant, recommendations for sale, storage, or rebuildinglmaintenance of the pump will be developed. We feel it is important to have an inspector on site as the plant is removed to directly inspect eonditionsloperations and to direct the contractor. ($ 658) • • 4 Conduct Video Inspection of the 10-Year Old Weil 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 that any consultant and/or contractor should insist on prior to any work to 1) be able to design the most appropriate cleaning program without damage to the well, Z} 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 ($1,008). 5 Design and Specify Cleaning Techniques. Based on review of the video inspection and well construction, HLI will specify an appropriate well cleaning program to convey to the well contractor and from which to develop a bid schedule of work. ($ 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. ($1.,500) 7 Oversee and Direct the Field Work, Re-Testing, and Clean Up HLI will remain in daily contact with the drilling contractor and make site visits as deemed necessary, This task includes the scheduling, oversight, and documentation of the contractor's work including site visits, tool measurements and disinfection, documenting materials and hours, and obtaining samples of scrapings from the well for potential analysis. The cleaning program and/or down hole tools may be adjusted or changed based on actual encountered conditions. Containment of bailing, mud, etc will be looked after and the site kept as clean as possible. Final .clean up to pre-existing conditions will occur at the end of the project. Appropriate disinfection of all t©ols and equipment will be a priority. Great attention will be given to the security ofthe-open well and site throughout the project. The disinfected pumping plant will be re-installed in the sterilized well and a short pumping test conducted to compare to the baseline test data. Weekly project updates will be made to the City by e-mail. ($ 2,938} • 8 Conduct Video Inspection of the Cleaned Casing and Screens Immediately following the cleaning, the water column in the well will be cleared and a comprehensive side-viewing and axial-viewing video inspection will be conducted. 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 thatno damage was imparted to the well. Again, disinfection of all dawn 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. s 4 N J S w A ~, 6 w • ~a 3 O ~ [7 ~ F ~ a ~ ~7 ~ ~(.J ~ N ~ ~ ~ o _ ~_ ~ o Sry. ~: ~ ~ ~ 5. t3 a p a ~ < ~ ~ ~' 8. ~ `~. ~ ~ : ~ ~i ~ i r ~ ~ ~ ~ ~ w ~ ~ `~ ~ ~ W~ ~ c f° °e ~. ~ ~ a. ~ x + ~ ~ ~ Q y 8 3 ~' a u YC R° ~; ~ ~ ~ ~ ~ 7 8 n ` g ~ ~ a a ~ '~ ~ 3 ~ b ~ ~ ~ ~ ~ , ~ ~ n ~ ~ e z ~, m Po oa w Oo N O~ 00 --~ - N ~ N m A ~ ~ A `~ ~ o ,x Go .. ~ Q; R ~ .y°r N a t;y u o s.. a o y ~' ~ ~ ~ o A ~ CJO y~ ~. Z ~ a n o. o ~" Al : CL ~ O v ~ ~ ' p `~ o ~ T+ O , e ~ ~ ~ ~ A ~' OO O A O N O O O '+1 ~ N~ ~~ °' .7 ~ '6 m ~ A ~'`A~ ~. ~~ n V // 4 0 ~ v m f/! ~ ~~ 1"w ~ A ~ E~ O A N N 0 to ~o A to N ~ Cn t~ii ~ o N N in A ~ to FA ~ ~ ~ g m ~ 'O ~ ~ ~ ~ C n m ~. 0 O K a ~ A m ~ r ~N O ~ O O O b O O O ~ V+ G ~, .+ ~ ~ O ~ ~' O 4 fD ,~, A~ r O T y A ~/g ~ O O~0 O~0 O O Oda Oho ~~.qq tlo O~0 A 69 0 ~ _ J ~ ~ LA7 ~ 3 A 1~ {~Ay9 O ~ 69 v O O O O _C O ~ 69 ~ ~ RJ ,~ t~/l pj ~"' O ~ ~ ~ Li ~ ~~II99 ~(1 OO O ~ ~ p O O ~ O O d ~ ~ ~ O .~. ~ ~ a ~ n rte.. ~ ~ ~ o ~ `~O' r ~ ~ ~ '~ ~ 00 °D ~ ' Y w J G yn ~ ~ A J N ~D W v' tpo ~ ~ d' O 69 Vii ~ 6:' ~l v' V' w A ~~! l!' v~~ YW ! O O O O D O W W C. ~% 0