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To:Michael P. Gaffron, Asst Planning & Zoning Administrator <br />Proa:Stephen Weckman, On-Site Systems Manager <br />Date:October 15, 1992 <br />Subject: Subdivision #1762, Paul Boyke - Septic Review <br />I have reviewed the proposed septic system testing and <br />design for this property and would make the following comments. <br />LOT 1, BLOCK 1 - EAST ONE-HALF <br />This lot has an existing residence with an on-site sewage <br />treatment system. The system is a conforming system according to <br />MPCA Rules Chapter 7080 and City of Orono Code. The system <br />includes two 1,000 gallon pre-cast concrete septic tanks and <br />approximately 1,000 s.f. of shallow drainfield trenches. The <br />septic system was installed in 1987 at which time soil testing <br />indicated a three foot separation between the trench bottom and <br />the seasonally high water table as indicated by mottling and is <br />presumed to be installed as designed. <br />The existing drainfield is approximately ten feet from the <br />proposed driveway for the west lot. Due to the elevation of the <br />existing driveway, the proposed driveway for the west lot would <br />likely require fill to be constructed wh.ch would Impede the <br />natural drainage and could adversely effect the function of the <br />drainfield. Driveway specifications should be provided <br />including a topographic map detail so the impact ({f any) may be <br />noted. <br />Soil testing has been provided indicating an alternate <br />drainfield site for a 4-bedroom home to the east and north of the <br />existing drainfield. This area would also be suitable for a <br />shallow trench system. Drainage from the existing driveway would <br />flow directly across the alternate drainfield site, therefore a <br />drain tile or other method for redirecting the drainage must be <br />incorporated at the time the future site is to be ';sed. Specific <br />alternate site details are included below: <br />Depth of seasonal saturation (mottling) is 4* to 4*2", <br />requiring shallow trenches. <br />Slope is 4%. <br />The percolation rate averages 7.9 minutes per inch at <br />12 inches. <br />Drainage must be directed away from drainfield site. <br />as ■ ^ V ha II *