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Home My WebLink About01/21/2014 Deep Well 5 Repair- Change Order # 2Prospect 1 l� INTEROFFICE MEMORANDUM TO: VILLAGE MANAGER, MICHAEL E. JANONIS FROM: WATER/ SEWER SUPERINTENDENT DATE: JANUARY 16, 2014 SUBJECT: DEEP WELL 5 REPAIR - CHANGE ORDER #2 ($301,914) BACKGROUND In July 2012, the Village Board awarded a $163,165 contract to Municipal Well & Pump of Waupun, Wisconsin to pull the pump from Deep Well 5. The work at Well 5 entailed the removal of a 500 hp three -phase electric motor and the pulling of the line shaft piping from approximately 1,100 feet below grade where the pump bowl assembly sits in the aquifer. The entire depth of the deep well was televised to determine if there are any defects that need to be addressed. Defects in wells are typically loose or broken pipe joints, cracks or holes in piping that may allow contaminants into the well or aquifer. Staff retained the professional services of Manhard Consulting Ltd of Vernon Hills, Illinois to provide oversight of the rehabilitation project. At the October 2012 Board meeting, staff brought forward Change Order #1 to make repairs to the well pump and to brush clean the well borehole, re- chlorinate and then re- televise the well. The Board approved Change Order #1 which brought the total contract award to date for Municipal Well & Pump to $203,447. DISCUSSION In Spring 2013, Municipal Well & Pump performed the well pump repairs. The re -built pump and piping were delivered to the well site and made ready for re- installation. Prior to their re- installation, Municipal brush cleaned the well borehole and re- televised the well for the engineer to review. Based on the re- televising; there were significant defects found in the well liner that were hidden from earlier videos by the scale build up within the well. There are numerous holes in the well liner caused by corrosion that developed over the years. The holes discovered were too numerous to count and were of various sizes ranging from 1 inch to several inches in diameter. The engineer determined that if the well pump were re- installed without any further repairs that the well liner could collapse, destroy the well pump, and render the well unusable. Staff directed the engineer to review repair options and obtain repair estimates. Mount Prospect Public Works Department The engineer recommended several courses of action; including abandoning the well, removing and re- lining the well, installing a narrower lining, and the drilling of a new well. Manhard's recommendation after lengthy discussion and review of the issue was to re -line the well with a Page 2 of 3 DEEP WELL 5 EVALUATION AND REPAIR CHANGE ORDER #2 JANUARY 16, 2014 narrow liner (option #3). This repair would allow the existing well pump to be re- installed and put the well back into operation at a minimal expense. Manhard reviewed the pricing submitted by the contractor, Municipal Well and Pump and queried other well providers to obtain estimates for similar repair work. The repair costs were determined to be reasonable by the engineer. Additionally, staff performed an extensive review of all standby wells. A fundamental purpose of this review was to determine if the Village's emergency water demand could be met with as few four (4) wells (instead of the existing five (5) wells). Such a determination would increase the viability abandoning Well 5 in lieu of further repairs. Baxter & Woodman Consulting Engineers of Crystal Lake, Illinois assisted the Village with this review. Harry Harmon a renowned ground water expert from Baxter & Woodman reviewed the well records, visited each of the well sites, reviewed water quality reports from well samples and reviewed the USEPA/IEPA compliance and monitoring requirements for deep wells. The firm was also asked to look at the Well 5 situation and the options to make a second recommendation on the repair of Well 5. Baxter & Woodman's analysis re- affirmed the village's strategy to maintain the standby wells as an emergency backup in case our main source of water was interrupted. Baxter's review also looked at the Well 5 repairs and recommended that in order to meet our daily needs in an emergency the Village could abandon only one of the five wells. They also opined that should the Village desire to transition to well water on a permanent basis, the capacity from Well 5 would be necessary to satisfy [EPA Maximum Daily Demand requirements. It is the opinion of staff that Well 5 is not a preferred candidate for abandonment. The Well 5 facility is already supported by an emergency stand -by generator capable of starting and running the deep well for extended periods of time. If a well were to be abandoned, staff would instead consider Well 4 a more viable candidate because it does not yet have an emergency power source. Additionally, staff believes it will be problematic to install an emergency generator at Well 4 due to site constraints and the close proximity of nearby homes. Furthermore, the Well 5 facility has greater storage capacity, overall pumping capacity, and impact on transmission mains. Based on an extensive review of the available repair options and after several lengthy meetings with all parties, staff is recommending that we rehabilitate Well 5 by installing a narrower liner into the well for a cost of $276,914. The work will involve the installation of a narrower liner into MEO /meo C:\ Users \sdorsey \Documents \Water \Well 5 \Rehab 2012 \Board update repairs 2013.docx Options 1. Do nothing — no further repairs $203,477 (sum already awarded 2. Remove and replace the existing liner $361,721 3. Install a narrower 12" liner $276,914 4. Abandon the well $165,000 5. Drill a new well $1,100,000 Manhard reviewed the pricing submitted by the contractor, Municipal Well and Pump and queried other well providers to obtain estimates for similar repair work. The repair costs were determined to be reasonable by the engineer. Additionally, staff performed an extensive review of all standby wells. A fundamental purpose of this review was to determine if the Village's emergency water demand could be met with as few four (4) wells (instead of the existing five (5) wells). Such a determination would increase the viability abandoning Well 5 in lieu of further repairs. Baxter & Woodman Consulting Engineers of Crystal Lake, Illinois assisted the Village with this review. Harry Harmon a renowned ground water expert from Baxter & Woodman reviewed the well records, visited each of the well sites, reviewed water quality reports from well samples and reviewed the USEPA/IEPA compliance and monitoring requirements for deep wells. The firm was also asked to look at the Well 5 situation and the options to make a second recommendation on the repair of Well 5. Baxter & Woodman's analysis re- affirmed the village's strategy to maintain the standby wells as an emergency backup in case our main source of water was interrupted. Baxter's review also looked at the Well 5 repairs and recommended that in order to meet our daily needs in an emergency the Village could abandon only one of the five wells. They also opined that should the Village desire to transition to well water on a permanent basis, the capacity from Well 5 would be necessary to satisfy [EPA Maximum Daily Demand requirements. It is the opinion of staff that Well 5 is not a preferred candidate for abandonment. The Well 5 facility is already supported by an emergency stand -by generator capable of starting and running the deep well for extended periods of time. If a well were to be abandoned, staff would instead consider Well 4 a more viable candidate because it does not yet have an emergency power source. Additionally, staff believes it will be problematic to install an emergency generator at Well 4 due to site constraints and the close proximity of nearby homes. Furthermore, the Well 5 facility has greater storage capacity, overall pumping capacity, and impact on transmission mains. Based on an extensive review of the available repair options and after several lengthy meetings with all parties, staff is recommending that we rehabilitate Well 5 by installing a narrower liner into the well for a cost of $276,914. The work will involve the installation of a narrower liner into MEO /meo C:\ Users \sdorsey \Documents \Water \Well 5 \Rehab 2012 \Board update repairs 2013.docx Page 3 of 3 DEEP WELL 5 EVALUATION AND REPAIR CHANGE ORDER #2 JANUARY 16, 2014 the well and grouting the new liner to the old then allowing the new liner to set before replacing the rehabilitated pump into the well to place the pump back into service. The well will then be disinfected and sampled to meet the necessary IEPA requirements before the well is deemed operational. A contingency of $25,000 is recommended by staff to allow for any further items such as couplings or other fittings that may be needed. Staff is recommending continued repair to Well #5 and the authorization of Change Order #2 in an amount of $301,914 (the $276,914 liner repair plus the $25,000 contingency). The total contract amount for Municipal Well and Pump would be $505,391.00. This amount includes the $25,000 contingency, which if not needed, will not be paid to the contractor and will be retained by the Village. RECOMMENDATION I recommend that the Village Board authorize Change Order #2 from Municipal Well and Pump of Waupun, Wisconsin in the of amount of $301,914 for the liner repairs to Deep Well #5. Matt Overeem Superintendent I concurl Sean P. Dorsey, Director of Public MEO /meo C:\ Users \sdorsey \Documents \Water \Well 5 \Rehab 2012 \Board update repairs 2013.docx