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� TO: Jeanne A. Mabusth, Zoning Administrator FROM: Michael P. Gaffron, Septic System Inspector DATE: April 12, 1983 SUBJECT: Donald C. Mogen, 1170 Lyman Avenue Subdivision, Septic System and Site Evaluation Review I have reviewed the Mogen proposal for subdivision of the 4 plus acre property to create a second building site, and wish to make the following comments : Lot A (Existing House) Existing system for 1170 Lyman Avenue consists of 2 septic tanks and 2 separate drainfield systems. A new drainfield was added in 1981, keeping the old field as an overflow. The old drainfield was located by probing and the end marked with a stake. This drainfield extends about 30 ' into the proposed new lot, which is unacceptable. I have sketched (attached) a recommended lot line rearrangement which will include the existing house and drainfield on one lot while keeping an approximate 2 . 0 acre lot size for both lots . No alternate site was tested to show that suitable soils and area exist for future drainfield for the existing house. This testing should be submitted and approved as part of rhe subdivision process . Lot B (New Lot) A site evaluation of this property was performed by Gerald M. Sunde in 1978. I believe I have properly transcribed his test locations onto the sketch attached, although no actual test holes could be located. The proposed primary and alternate drainfield sites lie on a terrace area just down from a steeper bank, above which is the assumed proposed .house location. With an average perc rate of 48 MPI, and mottlir�g not observed in the borings , the proposed standard trench system is acceptable. The site is more than 75 ' from the wetland and approximately 8 ' higher in elevation. Because of the odd-shaped lot configuration and location of septic systems on both lots , possible sites for a well to serve the new lot are somewhat limited but not unworkable. I note that Coffin ' s survey dated 11-17-76 shows a house located approximately on top of the tested drainfield site. This house location is, of course, not acceptable.