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ENGINEERS ARCHITECTS PLANNERS January 31, 1990 Honorable Mayor and City Council Lake Elmo, Mimnesota Re: Proposed Revision to "One Acre" Rule Lake Elmo, Minnesota Corrunission No. 9150-000 Dear Mayor and Council: TOLTZ. KING, DUVALL. ANDERSON AND ASSOCIATES, INCORPORATED 2500 AMERICAN NATIONAL BANK BUILDING SAINT PAUL. MINNESOTA 55101 6IM92-WO FAX OIZ292-0063 At the January 2, 1990 Council Meeting, the staff was directed to submit suggested wording to clarify the "one acre of land suitable for drainfield purposes" rule. The present wording does not conform to the wording in the proposed Comprehensive Plan and needs clarification because it requires two standards. The following are our recornmendations. For A, RR, R-1, R-2, RE (2-1/2) and RE (5) Zoning District, the requirement for one acre will always be larger than the requirement for two sites, therefore the following wording is suggested: "All newly subdivided lots shall have at least one„won i�gtrutmacre of land dedicated for septic system use. This area shall not contain permanent buildings or structures, wells, paved surfaces, drainage easements, or the setback distances from any of the above or from property lines. The suitability of this area for septic system use shall be determined by comparison to the Washington County Soil Survey. If the area is classified as having only "slight" or "moderate' limitations for drainfields, the area shall be deemed as meeting these requirements. If any portion of the proposed area is classified as having "severe" limitations, that area shall be evaluated by soil borings and percolation tests to verify the accuracy of the Soil Survey's "severe' classification. All lots existing prior to the adoption of this ordinance shall have area sufficient for two (2) separate and distinct drainfield sites, as verified by soil borings and percolation tests. Placement of the second required drainfield between the trenches of the first drainfield is prohibited."