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<br />If <br /> <br />DEPARQTOF <br />HAlURAl. RESOURCES <br /> <br />Minnesota Department of Natural Resources <br />500 Lafayette Road · St. Poul, MN · 55155-4037 <br /> <br />March 31, 2008 <br /> <br />Art Persons, Planning Supervisor <br />Source Water Protection Unit <br />Minnesota Department of HeaIth <br />18 Woodlake Drive Southeast <br />Rochester, MN 55904 <br /> <br />SCANNED <br />JUN - 4 2008 <br /> <br />1 <br /> <br />Dear Mr. Persons: <br /> <br />J <br /> <br />WELLHEAD PROTECTION PLAN, CITY OF CENTERVILLE <br /> <br />J <br /> <br />The Department of Natural Resources (DNR) has completed its review of the draft City of Centerville Wellhead <br />Protection Plan, Part 2 that was received March 18,2008. The plan was well written. However DNR Waters <br />would like the following,comments concerning the City ofCenterville Wellhead Protection Plan to be offered to <br />the wellhead protection manager: <br /> <br />1. DNR Waters believes that collecting data is important and recommends that the levels of public water supply <br />, wells be measured at least once a: mOl1.th. This infotination should be submitted to the DNR with the annual <br />Water Use Report and with DNRAppropriation Permit and Water Supply Plan amendments. The water level <br />information should be stored ina spreadsheet for an indefmite amount of time for easy accessibility. ' <br /> <br />2. The City of Centerville is required to update its Water Supply Plan (formerly called an Emergency and <br />Conservation Plan) and submit it to DNR Waters by October 15,2008. The new plan is changed substantially <br />from the old plan. Information on the plan may be found on the DNR Website at http://MNDNR.GOV/Waters. <br /> <br />3. Please note that besides Clearwater Creek, DNR Public Water 02~0252W is also located within the drinking <br />water supply management area (page 2). It appears that well #2 may be located within the floodplain of <br />Clearwater creek. Should the top of the casing be lower than the regulatory flood protection elevation, then well <br />#2 should be flood proofed to protect the aquifer from contamination by floodwaters. <br /> <br />4. The sealing of unused wells is important for protecting aquifers (page 6). Centerville should consider using <br />historic aerial photos to locate places where structures have been removed. Unsealed abandoned wells are often <br />located at sites where structures were removed decades ago. <br /> <br />5. Centerville mentioned the possibility of storm water polluting the aquifer (Page 7). Centerville should avoid <br />constructing sediment basins within the inner wellhead management zone. When possible, ditches should be <br />used to convey storm water instead of storm sewers, so that the water will continue to be cleansed by vegetation <br />and filtration. The use of low impact development principles as a means of reducing storm water impacts to the <br />aquifer is also a good idea. . <br /> <br />i I <br />; I <br /> <br />www.dnr.state.mn.llS <br />AN EQUAL OPPORTUNITY EMPLOYER <br />() PRINTED ON RECYCLED PAPER CONTAINING A MINIMUM OF 10% POST-CONSUMER WASTE <br />