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City of Orono <br />Crystal Bay, Mn. 55323 <br />Re: File No. 139 <br />January 23, 1978 <br />Two - 1000 gallon septic tanks in series <br />One - 250 gallon dosing tank <br />Percolation rate - 25.2 mpi primary and 17.1 mpi secondary <br />Drainfield area 1500 sq.ft. (1500) <br />Trench Bottom 3 ft. (3 ft.) <br />Length of Drainfield 500 ft. (500) <br />Number of laterals 5 (5) each 100 ft. long (100) <br />Minimum spacing of laterals 7� feet (7h) <br />The contGur map accompanying the design indicates up to 12% slope. Therefore, <br />drop box structures will be required and extreme care will be necessary to layout <br />the lateral lines parallel with the slope. The drainfield must be located in <br />order to miss an existing foundation shown on the site plan. We suggest careful <br />inspection of this facility during installation because of the maximum 12% slope <br />involved. <br />If we may be of further assistance in this matter, please contact us at your con- <br />venience. <br />Yours very truly, <br />VNESTA00, ROSE)M, ERLIK 6 ASSOCIATES, INC. <br />James C. Olson <br />IJCO: 1 i <br />Page 2. <br />C <br />