Agenda - Council - 08/08/2006 - Laserfiche WebLink

Home

Staff Recommendation: Reviewed by: City Administrator CC: 8/08/06 CASE # UPDATE TO THE RIVER BANK WATER SUPPLY COLLECTION SYSTEM PILOT STUDY Brian E. Olson, Director of Public Works / Principal City Engineer The River Bank Water Supply Collection System Pilot Study was approved in November of 2005 and resulted in an agreement from the Anoka County Parks Department to allow us to utilize the Mississippi West Regional Park for our analysis of the Mississippi River for water supply purposes. As you may recall the idea at the time was that the proposed water supply facility will draw water indirectly from the river using a riverbank infiltration system. This will require constructing a series of wells, horizontal collectors or infiltration galleries on the riverbank. Pumping water from these devices will lower the local water table under the river and water will flow from the river into the aquifer. Our initial investigations have indicated that there is not enough capacity in the test wells that we have constructed indicating that there must be a confining layer between the river bank and the river and that we are only drawing on ground water. A solution to this is pulling water directly from the surface water supply or the river, however, this will require us to use the pilot plant for a longer time (approximately 8 -9 months instead of 3 -4 months) It will be necessary to investigate further by exploring the geology of the area.. The costs for the additional soil borings for investigative purposes and additional pilot testing that the Minnesota Department of Health will require for pulling water directly from the river will be taken care of by Bolton and Menk. Bolton and Menk will be present to provide an update and answer any questions regarding the pilot plant study and will be requesting an additional $35,000 to provide 3 phase power to the temporary plants for the extended amount of time that we will be required to test the surface water. Staff recommends approval of the $35,000 amendment to the contract with Bolton & Menk, Inc for the installation of 3 -phase power to the Pilot Plant area. Council Action: Motion for approval of the $35,000 amendment to the contract with Bolton & Menk, Inc for the installation of 3 -phase power to the Pilot Plant area. -359-