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-I <br />sS- I <br />To: <br />From: <br />Date: <br />Subject: <br />Jeanne Mabusth, Building & Zoning Administrator <br />Michael P. Gaffron, Asst. Planning & Zoning Administrator <br />April 10. 1996 <br />Tested Drainfield Locations. Lot 2, West Branch Hill <br />I have reviewed subdivision file #556, which resulted in the creation of Lot 2, West Branch Hill in <br />1982-83. While an experimental shallow trench system was initially proposed for Lot 2, that plan <br />was later dropped. Additional testing was then presented indicating a site suitable for shallow <br />trenches at the south central portion of Lot 2. with an alternate site requiring a mound system at the <br />southwest comer of the property (See Bob Koch drawing, 1982). <br />This alternate site was only tested via one perc test and one boring, inadequate to meet current <br />standards. Further, the City has since adopted a 6% slope limitation for mounds, and no slope <br />information was presented. Finally, it appears this site may conflict with the 25' easement along the <br />west side of Lot 2. <br />Note also that staff has not confirmed whether the shallow trench system for Lot 2 is actually <br />feasible, since mottling interpretation has been tightened up considerably in the 14 years since this <br />testing was done. Given the soil type, it is possible that actual mottling is much shallower than the <br />4.2-4.6' reported by Koch in 1982. <br />For the above reasons, before any approval is considered for use of the 25* easement for access <br />to Lots 95-96, additional testing should be done on Lot 2, West Branch Hill, to confirm that <br />feasible primary and alternate drainfield sites are available that won't be impacted by use of <br />the easement <br />iI