1996-008313 - new septic system - Laserfiche WebLink

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F S-P TESTING, INC. Steven B. Schirmers — MPCA Cert. No. 627 951 Katydid Lane NE • St. Michael, MN 55376 • (612) 497-3566 June 30 , 1994 Kelley-Kelley Nursery 2325 Watertown Rd . Orono, Henn. Co. , MN This On-Site Sewage Treatment System is Designed for a Retail Garden Nursery with 100 customers/day at 2. 5 gal/day = 250 gallons & 10 employees at 15 gal/day = 150 gal/day & 50 gallons wash water/ day. Total water use = 450 gal/day. Designed in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinance. Recommend to install low water use, 1 . 6 gallon flush toilet to assure lower water use. This site has an existing failing system due to clay soils with a high seasonally high water table. The existing tanks are located northeast of the building and are deep and could not be found. To locate the tanks , the supply line at the old system will need to be found & followed back to the tank with a backhoe. The existing tanks will need to be abandoned, pumped & filled with soil . The soils on this site are SCS soils mapped - HbC - Hayden loam. A seasonally high water table was located at 36" & 42" , (mottled soil ) . The bottom of the system must be located at least 3 ' above the seasonally high water table. A Pressurized At Grade System may be installed. The soils at a depth of 12" have a percolation rate averaging 10. 3 min/inch. A pumping chamber will need to be installed to lift the effluent to the treatment area. The power supply and switches must be located outside the manhole and pumping chamber in a weather proof enclosure. A warning device must be installed with a light and sound device, this is in case of a pump failure . (mercury floats are a good method) . All neighboring wells are located greater than 100 ' away from the proposed treatment area. CONT' D