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TKDA TOLTZ, KIND, DUVALL, ANDERSON AND ASSOCIATES, INCORPORATED ENGINEERS ARCHITECTS PLANNERS 2500AMERICAN NATIONAL BANK BUILDING SAINT PAUL, MINNESOTA 55101.1003 512/292-4 O February 28, 1992 FAX 512/2920053 Honorable Mayor and City Council Lake Elmo, Minnesota Re: Old Village Septic System Problems Lake Elmo, Minnesota Cotmnission No. 9150-002 Dear Mayor and Council We have been looking at ways to help residents and businesses in the Downtown Old Village Area improve their on -site sewage treatment systems. Currently many of these properties still have a wetwell-drywell system. As you know, systems of this type do not treat sewage, Only dispose of it. These systems do cause ground water pollution, and are a health concern to the public. Because many of these properties do not have enough area to allow construction of a drainfield that meets City code, they have not upgraded their systems. At this time I call think of three possible solutions to this problem Construct a collection system and a new community drainfield to serve these properties. 2. Have these buildings placed on holding tanks. These tanks would be pumped each tine they fill up. Allow some of the properties with insufficient ]arid area a variance from the drainfield sizing mid setback codes. A new community drainfield will still be necessary for those properties with insufficient room for a variance. New Community Drannfield Option 1. Preliminary Design We have identified 16 buildings in the study area which would be connected to a City - owned drainfield. The combined estimated sewage flow from these buildings is 6,750 GPD. In order to treat this amount of effluent, a 1-1/2 acre drainfield site either east or west of the Old Village would be necessary. City -owned sewer pipes won](] be constructed is necessary to collect septic tank effluent from each connection and carry it to the drainfield site.