2009-00641 - new mound septic - Laserfiche WebLink

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a�'�/� �L��T11116�� I�14►. Steven B. Schirmers • MPCA Cert.No. 627 951 Katydid Lane NE • St. Michael, MN 55376 • (763) 497-3566 Fl�X (763)-497-5011 State License #394 � s~� - zYy - �,�,��f�� September 12, 2009 �1,�� — S'�� ? - 4' 4� 2,� � t l�' Dodd &Ann Cosgrove 2250 �rench Lake Rd. Orono, Henn. Co., MN A Compliance Inspection was completed for the existing on-site sewage treatment system located on this property. The system consists of 2-1000 gallon septic tanks & a trench system with 3-100' long trenches. Soil probings found the bottom of the trenches at approximately 30" to 36". Soil boring #4 found mottled soil (redox features) at 50" below the ground surface 8� boring #5 found motfiled soil at 26" below the surface. Thi� system does not meet a 3' separation from the bottom of the trenches & redox features & is cfassified as non-compliant, failing to protect the groundwater. The upgrade period will need to be determined by the City of Qrono. This on-site sewage treatment system is designed for a Type 1, four bedroom home, in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances. The sails on this site are clay loam . The periodically saturated soits were located at 20" to 28" (redox features). Due to the seasonally saturated soils, a Pressurized Mound System will need to be installed to treat septic effluent. The bottom of the rock must be iocated at least 3' above the saturated soils. The soils at a depth of 12" have a percolation rate of 26.7 mpi. 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. 1