04-03-90 CCM - Laserfiche WebLink

Home Browse Search

MAR 30 190 14:36 T K D A & ASSOC., INC. .., .i.. KD- TOLTZ, KING, DUVALL, ANDERSON _ AND ASSOOIATES, INOORPORATED ENGINEERS ARCHITECTS PLANNERS 2500 AMERIOAN NATIONAL DANK BUILDING SAINT PAUL. MINNESOTA s5101 .. 01 Y12YY-N00 March 22, 1990 PAX 61 =2Q w Honorable Mayor and City Council, - 3800 Laverne Avenue Lake Elmo, Minnesota 55042 Re: Preliminary Review SW-1 Public Water Supply Lake Elmo, Minnesota Commission No. 9150-000 Dear Mayor and Council: We have performed a preliminary review of the Conceptual Design Public Water Supply for SW- 1 dated February,1990. We have also reviewed the issues which were raised in 1985 to see if i they were still relevant today. The following are our conunents: Service Area: The service area chosen: anticipates that the Well Advisory .Area will be expanded southward to T.H. 5, if it hasn't been revised already. The City Council should decide if this is the appropriate service area. General Water System Design: We generally concur in the water system design as presented. Our major concern in 1985 was that, without an elevated tank, the well pump alone must be able to meet the instantaneous peak demand. The present system now includes an elevated tank. Water stored in the tank can be used to meet peak hour demands. a. Water TankSize: The conceptual design proposes a tank size equal to 30170 of the average daily demand. The Ten State Standards, which the State Health Department uses to review the adequacy of water systems, recommends 100% of average daily demand. In this case that would be 60,000 gallons. b. Well Location: The conceptual design proposes to place the new well in the no1111west Conner of the Shafer Gravel Pit. The report states that the well will draw most of its water from the northwest. The groundwater flow toward the well should also be analyzed for the condition when the gradient control wells are eventually turned off. Would the well's cone of influence extend into the landfill area if then pumped at 200 gpm?