1977-05-06 Septic System Design and Soil Testing

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Tom Jacobs City of Orono P.O. Box 66 Crystal Bay, Subject: Dear Tom: rCOMBS-KNUTSON ASSOCIATES, INC. CONSULTING ENGINEERS ■ LAND SURVEYORS ■ SITE PLANNERS NOW E December 19, 1977 DEC 20 13;1 VILLAGE 06 ORvHa Minnesota 55323 Septic System Review for Fred W. Brolinq Tract D, R.L.S. 1275, Plat 43152, Parcel 4000 As per your request of December 16, 1977, we have reviewed the subject septic system application. The applicant proposes to install a standard septic system consisting of two 1000 -gallon septic tanks, a 250-qallon dosing tank, 1463 S.F. of drainfield area (366 lineal feet x 4 ft. wide trench) and four drop boxes. Percolation rates averaqed 78 mpi at the primary site and over 120 mpi at the secondary site. The lot size is approximately two acres, which is the minimum lot size for an on-site disposal system. We recommend that the application not be approved for the following reasons: 1. The percolation rate of 78 mpi is slower than the minimum allowable rate of 60 mpi for a standard system. An alternate system or site must be selected. 2. The applicant proposes a trench bed with a four ft. width which is in excess of the 3 ft. maximum stated in Orono's code. 3. The alternate site ha.3 a percolation rate slower than 120 mpi. A mound system is proposed for this site, but the code requires that the substratum for a mound system shall have a percolation rate faster than 120 mpi. Therefore, the alternate site is unacceptable and a new alternate site must be selected. If the applicant should submit a new proposal, we request information on the number of bedrooms in the proposed house, the basement elevation of the proposed house, and the contours x IneA S - 7 O'e o 12805 OLSON MEMORIAL HIGHWAY, MINNEAPOLIS, MINNESOTA 55441 TELEPHONE (612) 559-3700 22 NORTH MAIN STREET, HUTCHINSON, MINNESOTA 55350 TELEPHONE (612) 879-8029 SOUTHWEST ENGINEERING DIVISION, MARSHALL, MINNESOTA 56258 TELEPHONE (507) 532.5820