12-08-1986 Council Packet - Laserfiche WebLink

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To: Zoning File #1093 From: Michael P. Gaffron, Asst Planning & Zoning Administrator Date: November 13, 1986 Subject: Septic Systems Review Proposed Lot 1 A. Existing System (existing house) was last inspected in August 1986; system apI pared to be substandard in size but functional; the house may not have been occupied at the time. B. Alternate Site tested in area south of house - average perculation 107 MPI, average slope 6-8%, mottling at 18", 2711, 30" - site would be suitable for a mound system. Proposed Lot 2 A. Primary Site tested on southwest -facing slope - average perculation 47.4 MPI, average slope 9-18%, mottling 36", 4411, 40" - site is marginally suitable for a mound, is adjacent to drainage swale - needs additional review. B. Alternate Site tested on south -facing slope - average perculation 49.3 MPI, average slope 12-20%, mottling at 48", 40", 30" - site is very ques•,.ionable for a mound given the slopes and proximity to drainageway. Proposed Lot 3 A. Primary Site tested on southwest -facing slope - average perculation 38.9 MPI, average slope 10-12%, mottling at 48", 48" - site is suitable for a shallow trench system, needs curtain drain. B. Alternate Site tested just downhill from primary - average perculation 49 MPI, average slope 3-4%, mottling at 30", 29" - this site is suitable for a mound system. Proposed Lot 4 A. Primary Site tested on northeast facing slope near "saddle" of lot - unclear between topography and site evaluators notes as to exact location - average perculation 3F.3 MPI, average slope 15-20% apparently, mottling at 48", 47" - site is suitable for shallow trench system if curtain is installed and if site is actually on the slope and not in the saddle area. B. Alternate Site tested northwest of primary site - average perculation 46.9 MPI, average slope 7-10%, mottling at 4111, 42" - site is suitable for a mound system.