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1d. Well No. 4 Award of Construction Contract CITY OF CHANHASSEN 7700 Market Boulevard PO Box 147 Chanhassen, MN 55317 Administration Phone: 952.227.1100 Fax: 952.227.1110 Building Inspections Phone: 952.227.1180 Fax: 952.227.1190 Engineering Phone: 952.227.1160 Fax: 952.227.1170 Finance Phone: 952.227.1140 Fax: 952.227.1110 Park & Recreation Phone: 952.227.1120 Fax: 952.227.1110 Recreation Center 2310 Coulter Boulevard Phone: 952.227.1400 Fax: 952.227.1404 Planning & Natural Resources Phone: 952.227.1130 Fax: 952.227.1110 Public Works 1591 Park Road Phone: 952.227.1300 Fax: 952.227.1310 Senior Center Phone: 952.227.1125 Fax: 952.227.1110 Web Site www.ci.chanhassen.mn.us ..id, ~ MEMORANDUM <J 0.. TO: Paul Oehme, Public Works Director/City Engineer'< I FROM: Joseph Shamla, Project Engineer November 23, 2009 O~ DATE: SUBJ: Well No.4 Raw Watermain Project No. 09-02: Award of Construction Contract PROPOSED MOTION "The City Council approves a construction contract in the amount of $733,211.53 to GM Contracting, Inc. for work to be performed on the Well No.4 Raw Watermain Project." City Council approval requires a simple majority vote of the City Council present. BACKGROUND On October 12,2009, the City Council approved the plans and specifications and authorized advertisement for bids. At the January 12, 2009 work session, staff reviewed with the Council a groundwater well study and water quality improvement report. This report included options to improve the water quality of Well No.4 which is located in Lake Susan Park. Well NO.4 is not currently treated for naturally occurring minerals such as iron or manganese, which can give the water a rusty coior and can cause odor problems. The well is only used during the summer when water usage is highest. During peak output, the water from Well No.4 is blended with the other water in the system so that the iron and manganese is less of an issue. Staff still receives complaints from residents when this well is used mainly because of the manganese in the well water. Several options for improving the water quality at Well No.4 were evaluated. The options were discussed in the September 28, 2009 and January 12,2009 backgrounds. The best and most cost-effective solution is to treat the water at the East Water Treatment Plant. PROJECT DESCRIPTION This project consists of installation of a raw watermain from Well No.4 in Lake Susan Park to an existing raw watermain on the south side of TH 5 by the pedestrian bridge. The majority of the pipe will be directionally bored. Also included in the project is an extension of a 4" irrigation pipe and a 1" service pipe to Lake Susan Park. The raw watermain alignment and design will allow future well connections. Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow Paul Oehme Well No.4 Raw Watennain Project November 23,2009 Page 2 BIDS Bids for the project were opened on Friday, November 13,2009 at 2:00 p.m. The bids have been checked for errors. Four bids were submitted. Bids included a base bid and an alternate to upsize the watermain between the proposed Well No. 14 and the existing watermain connection south ofTH 5. The upsize from a 16" diameter pipe to an 18" diameter pipe would allow additional wells to be connected in the future and would allow less head pressure put on the pumps during high demand periods. Staff recommends accepting the alternate. Provided below is a summary of the bids. Base Bid $657,095.25 $660,0 I 0.00 $711,845.32 $871,155.00 Bid Alternate $76,116.28 $141,080.00 $135,385.70 $128,350.00 Total Bid $733,211.53 $80 I ,090.00 $847,231.02 $999,505.00 The low bidder for this project including the base bid and bid alternate is GM Contracting. GM Contracting has done work in the city before and their work has been acceptable. The last project GM Contracting worked on in the city was the 77th Street Utility Improvement Project. The project is tentatively scheduled to start in early December with a completion date of May 28,2010. Staff will notify the property owners in the area prior to the start of construction with a project timeline. No water disruptions are anticipated. This project was budgeted in the 2009 CIP, Project W-025. The amount budgeted for this project is $930,000.00. Attachment: I. eIP Page c: Kevin Crooks, Utility Superintendent GM Contracting, Inc. g:\eng\public~2009 projects\09-02 well #4 raw watennain\award construction contract 112309.doc Department Water System hnprovements Type Improvement Useful Life Unassigned Category Utilities Priority nfa Capital Improvement Program. City of Chanhassen, MN 2009 thru 2013 Contact Paul Oehme Project # W-025 Project Name Well #4 Improvements Account # 1 700-xxxx-4751 Account # 3 Account #2 Total Project Cost $930,000 Description Engineering has reviewed the test data of the water from Well #4 and currently, the radium levels are at the upper end of the Minnesota Dept of Health (MDH) guidelines. In 2004, staff reviewed the radium problems with the MDH. The well is currently used as a peak well during high demand periods which blends the Well #4 water with the other well water in the system. This well is also high in iron and manganese levels which creates rusty water complaints. If the radium levels continue to rise, the City may have to enter into a monitoring program with the MDH on a temporary basis if the issue is not addressed. The MDH at that time determines the acceptable amount of water that can be pumped into the City system from Well #4. Staffwill draft a s,tudy to identify the best solution to address the poor water quality issues at this well. Options for improvements include redevelopment, abandoning the well, installing a small treatment plant at the well site or treating the water at the East Water Treatment Plant. Extendin a new water i e from Well #4 to the East Water Treatment Plant's existin raw watermain is bud eted for 2009. Justification Well #4 continues to test high for radium and is a high producer of iron and manganese which creates "rusty" water complaints. Expenditures Construction 2009 930,000 930,000 2010 2011 2012 2013 Total 930,000 930,000 Total Funding Sources Water Utility Fund 2009 930,000 Total 930,000 2010 2011 2012 2013 Total 930,000 930,000 Operational Impact/Other This project will not increase opemtions cost. 132 . . . . . . . . . . . I......... .....,",.