1997-009566 - tanks only - Laserfiche WebLink

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� - ,,,�7�P �EST�NGs �NC. Steven B. Schirmers • MPCA Cert.No. 627 951 Katydid Lane NE • St. Michael, MN 55376 • (612) 497-3566 FAX (612) 497-5011 State License #394 September 26, 1997 Pam Sagan 1300 French Creek Drive Orono, Henn. Co., MN This site has an existing on-site sewage treatment system consisting of 2-1000 gallon holding tanks & 1-1000 gallon pumping chamber. The drainfield is 900sq.ft. with 300 lin.ft. of trench. Approximately 20 lin.ft. of the trench is below the driveway. The original design required 280 lin.ft. At present the system is hydraulically overloaded and is surface discharging which is an imminent health hazard and must be repaired or disconnected within 10 months. The home has an iron filter which discharges approxirriately 600 gallons every 2 days which will be diverted out of the system. A water meter was installed which does not include the iron filter or water softner. Readings from 9-13-97 to 9-20-97 show water use from 210 to 490 gal/day. An event counter was also installed at the lift station. The pump is pumping approximately 225 gal/cycle, a check valve was installed to prevent drainback, this will need to be removed before the winter months to prevent freezing. On 9-15-97 & 9-16-97 the discharge to the system was 900 & 1125 gallons plus with the remainder of the week at 225 to 450 gal/day. On 9-15-97 & 9-16-97, approximately 1" to 3" of rain had fallen. This indicates ground water is entering the system through the tanks or possible drain tile from the house foundation. The tanks will need to be inspected for leaking & repaired and the drain tile checked. Once this is completed with the water use reduced in the home, low flush toilets, shower heads, etc. the system may recover. If the system does not recover and surface discharge reoccurs, the system will need to be added to by using 10" diameter gravelless trench befinreen the existing trenches & downslope of the existing trenches using a sizing factor of 1.27sq.ft./gallon, the new system would support 750 gal/day (960sq.ft.) The soils on this site are SCS soils mapped -AnB - Anoka loamy fine sand. No seasonally saturated soils were present. The bottom of the treatment area must be located at least 3' above the seasonally saturated soils. The soils at a depth of 30" & 36" have a percolation rate averaging 27.3 mpi. 1