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SP TESTING INC. <br /> Steven B.Schirmers -951 Katydid Lane NE-St. Michael, MN 55376 <br /> Cert. No 627 -- State License#394 - Phone 763-497-3566 - Fax 763-497-5011 <br /> www.sptesting.wastewater@comcast.net- schirmerswastewater.com <br /> September 17, 2019 <br /> Don Adams <br /> 200 Truffala Trail <br /> Orono, MN <br /> A Compliance inspection was completed for the existing on-site sewage treatment <br /> system located on this property for the sale of the home. The system consists of 2- <br /> 1250 gallon septic tanks, 1-1250 gallon pump tank & a pressurized mound system <br /> with a 10' x 51' rock bed, built later than 1996 for a 4 bedroom home. <br /> Soil boring #1 found mottled soil (redox features) at 2.5' into the original soil & the <br /> original soil at elev. 103.2 & the bottom of the rock bed at elev. 104.7 leaving 1.5' of <br /> sand below the rock bed & a 4' separation from the bottom of the rock & redox <br /> features. Soil boring #2 found mottled soil at 2.3' into the original soil & the original <br /> soil at elev.103.6 & the bottom of the rock bed at elev. 104.7 leaving 1.1' of sand & a <br /> 3.4' separation. This system meets the required 3' separation from the bottom of the <br /> rock bed. <br /> Soil probing into the downslope toe of the mound found the sand to be hydraulically <br /> overloaded & very near surface discharging. This system has the potential to be an <br /> imminent threat to public health & safety & must be repaired or disconnected within <br /> 10 months or as the City of Orono determines. <br /> The sand is ponding in the mound due to an iron filter installed in the home in early <br /> spring. Iron filters are known throughout the Industry to cause problems in septic <br /> systems & should never be discharged into them. Also drainage was diverted <br /> towards the upslope toe of the mound not allowing the water to drain away, so <br /> ponding of rain water is occurring also causing the sand to be wet. <br /> The proposal is to install a catch basin & drain tile to divert the run-off. It should be <br /> diverted towards the east. The iron filter must be removed from the system & <br /> diverted elsewhere or removed all together. <br />