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TOS Rod Backerud <br />Frais Michael P. 6a££ron» Asst Planning 6 Zoning Administrator <br />Date:November 23, 1987 <br />Subject: Proposed Gradln^^t 350 North Arm Lane <br />Based on the Hennepin County Soil Survey Maps, the soils at the site <br />o£ your proposed grading project are* generally only suitable £or mound-type <br />drain£ields when undisturbed. There is an extremely high likelyhood o£ <br />compaction and smearing o£ clay soils on the site with a project o£ this <br />magnitude, as well as disruption or destruction o£ the natural root and <br />worm channels and the natural internal fracture system in the topsoil. The <br />resultant hydraulic capabilities in relation to suitability for septic <br />systems will likely be much poorer, and less predictable. For these <br />reasons, septic systems are generally not allowed on disturbed soils. This <br />is common knowledge throughout the on-site sewage treatment industry and <br />was not an issue in your current dredging/spoil disposal application until <br />a potential buyer of the property requested subdivision Information., I