1983-04-12 Memo, Septic System Design Notes

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`PHIS MEMO AMENDS THE 'SEPTIC SYSTEM INFOE Mll`%TION' 1•10RKSHEET F OI1 LOT 24, FARM AT LONG LAKE TO: Jeanne A. Mabusth, Zoning Administrator FROM: Michael P. Gaffron, Septic System Inspector DATE: April 12, 1983 SUBJECT: 900 North Brown Road, Lot 24, Farm at Long Lake We have recently received numerous queries regarding this lot and it's buildability. For the record, I have made various sketches and computations (attached) of the building envolope and septic envelope based on xisting zoning code- requirements. oderequirements. These include: zoning - 50' front setback 30' side setback 26' drainageway (creek) setback no -build on drainaae easement On -Site sewage 10' property line setback treatment 75' creek setback system Based on these requirements, I v►ish to make the following comments: 1) Building envelope contains approximately 20,215 square feet or + 0.46 acre. 2) On-site envelope partially overlaps building envelope and contains approximately 16,000 square feet. 3) No other areas on the property meet the requirements for a building or on-site system location. 4) 3 percolation tests and 1 soil boring were performed by Mark Gronberg on the .lot in November 198.'. I note that onl;• one of the pere tests was within the acceptable on-site envelope. The boring, which was outside the envelope, .indicated acceptable soils for a standard trench system. Percolation rates for the three test holes were 30 MPI, 40 MPI, and 80 MPI. In my opinion; based on the information presented above, this lot is potentizlly buildable without variances, but is severely limited by the creek to a finite variety of site plans, and is further restricted by the need to provide primary an,J alternate drainfield sites. It appears that a full site evaluation (6 peres, 3 borings) within the acceptable on-site envelope, should be required prior to issuance of any building permits.