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To:Jeanne A. Mabusth, Building & Zoning Administrator <br />Fr<»ii:Stephen Weckman/ On-Site Systems Manager <br />Date:October 13, 1992 <br />Subject: Subdivision #1771, Jim and Sarah Markoe - <br />Septic Review <br />I have reviewed the proposed soil testing and septic system <br />design for this property and would make the following comments. <br />LOT 1 <br />Soil testing and system design has been submitted for a 4- <br />bedroom home including primary and alternate drainfield sites. <br />Both sites meet MPCA rules Chapter 7080 requirements, however <br />both sites have slopes greater than 6% as required by Orono City <br />Code. The primary septic site has slopes between 6% and 8% while <br />the alternate site averages 8% slope throughout. Both sites also <br />encroach within the required 20* lot line setback, requiring a <br />10' variance. <br />This lot du«^s not have sufficient area available for a 5- <br />bedroom home, therefore a 4-bedroom home will be the maximum home <br />size possible. The lot is limited due to excessive slopes and <br />extra caution must be exercised to assure that these sites may be <br />allowed to function adequately. For this reason, staff <br />recommends that a buffer strip 20' wide be set aside along the <br />north property line adjacent to the alternate drainfield site <br />which must not be disturbed or manipulated in any way in order to <br />avoid any problems resulting from land alterations. Also, no <br />hardcover should be allowed within 40* of the primary drainfield <br />site for Lot A for the same reason. As this lot has been <br />manipulated by dredging and filling, the proposed primary and <br />alternate drainfield sites are the only available areas suitable <br />for sewage treatment and extra care must be taken to ensure the <br />integrity of these sites. <br />Specific septic system details are included below: <br />Designed for a 4-bedroom house <br />Depth of seasonal saturation (mottling) is 2' to 3-1/2' <br />for both primary and alternate drainfield sites. <br />Slope at the primary and alternate drainfield sites is <br />6% to 8% and 8% respectively. <br />Percolation rates average 10 minutes per inch at 18 <br />inches. <br />Topographic location and site drainage is adequate. <br />Variances will be required for slope (up to 8%) and for <br />lot line setback (10* variance).