08-13-2014 Council Agenda - Laserfiche WebLink

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1��RING k ASSOCIATE TAU6 HUPTU Memo TO: Joel Hanson, City Administrator Bill Dircks, Public Works Director, Honorable Mayor & City Council Members FROM: Lee Elfering, City Engineer DATE: August 8, 2014 RE: Public Works Site Remedial Investigation Award As the Council is aware some contamination issues were discovered on the new Public Works site during the original geotechnical investigation and we have been working on the resolution of those issues in parallel with the construction planning. A new Phase I and Phase II report were prepared by American Engineering Testing, Inc (AET) along with a Response Action Plan (RAP) for dealing with any contamination that was exposed during construction. The reports and the RAP were all submitted to the MPCA. While the MPCA approved the RAP they are requiring that a Remedial Investigation (RI) be completed on the site. The purpose of the RI is to better determine the extent and impacts of the site contamination and requires some additional soil and groundwater testing including the installation of monitoring wells on the site. The wells will be monitored over a minimum on 10 months, possibly longer. While these costs must be paid for by the City, they are up to 90% reimbursable through the State's PetroFund program. In total there will be 5 monitoring wells installed on the site. Four of the wells will be located near the outer boundary of the property and one as near to where the highest level of contamination was detected as possible. The fact that wells will be in use for the greater portion of a year will require that we coordinate their locations with the construction crews completing the site improvements. The goal will be to place the wells in the green areas of the site to minimize there impact to the construction schedule and completion of the improvements. Quotes were obtained for the RI from AET, Braun, and MTM Environmental and those quotes were reviewed by PetroFund staff to ensure compliance with their bidding requirements. The low bid of $19,487.90 was submitted by AET. They have completed the most recent environmental work on the site and we would recommend the Council authorize the RI work to be completed by AET. If anyone has any questions or concerns regarding these proposed actions, please call me at (763) 780-0450. 10062 Flanders Court NE — Blaine, MN 55449 — Ph: (763) 780-0450 Fax (763) 780-0452 Memo -080814 -CC (RI Award)