01-12-1987 Council Packet - Laserfiche WebLink

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To: 'zoning File #1093 From: Mic.ha,:? P. Gaf f ron, Asst Planning & Zoning Ail -in- .rator Date: November .3, 1986 Subject: Septic Systems Review Proposed Lot 1 A. Existing System (existing house) was last inspected in August 1986; system appeared 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", 27", 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%, rottling 36", 44", 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 perculat::on 49.3 MPI, average slope 12-20%, mottling at 48", 40", 30" - site is very questionable 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, a erage slope 10-12%, mottling at 48", 48" - site is suitable for a st•.allow 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" - thin :_t_e is suitable fo,, a mound system. Proposed Lot 4 A. imary Site tested on northeast facing slope near "s e" of lot - unclear between topography and site evaluators no., as to exact location - average perculation 38.3 MPI, average slope 15 -20% apparently, mottling at 48", 47" - site is suitable for shallow trench system if cur' 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 41", 42" - sito is suitable for a mound oystem.