Agenda Packets - 1985/02/11 - Laserfiche WebLink

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MEMO TOi Clerk -Administrator and City Council FROM: Director of Public Works/Community Development DATE: February 14, 1985 SUBJECT: WELL N0. 4 MAINTENANCE AND REPAIR I. BACKGROUND The 1985 budget includes inspection and repair of the subject well, pump and motor.. Well #4 has not been used since 1979 because of high sand content and odor problems. The odors are probably caused by dying iron and/or sulfer bacteria. This bacteria releases a gas when killed by the injection of chlorine at the well house. The gas remains in the water until released at a water tower or house water faucet. Electrical, control, chlorine and fluoride equipment have been salvaged for use at other wells. Replacement equipment must be installed for the well to operate. In 1979, the water had an iron content of 0.49 milligrams per liter (mg/L) and a manganese content of 0.03 mg/L. The Minnesota Department of Health's recommended limits are 0.3 mg/L and 0.05 mg/L, respectively. (Attachment #1 is the 1979 water quality report.) The well should be bailed to reduce the sand content of the well water. The hailing procedure removes excess sand from the bottom of the well. In the past, The City has not restricted summer lawn sprinkling because water supply has always exceeded water demand. During the dry summer of 1976, the City almost had to restrict lawn sprinkling. Since then, summer water demand has been low due to sufficient rainfall. If a future summer is very dry, the City may need to pump all the wells in order to meet the water demand. Therefore, solving the problems at Well #4 will reduce the probability of water shortages. II. ALTERNATIVES The following alternatives are possible solutions to water supply problems in Mounds view: 1. Do nothing and hope the water supply is adequate in future summers. 2. Correct the problems at Well #4 and if the problems cannot be corrected, construct a water treatment plant at Well #4.