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Percolation tests are no longer required by the city of Orono Soils verification required at bottom of exavation MEMORANDUM September 24, 2018 ftu'6 Investigation & Design - To: Mr. Roger Peitso, Building Official City of Orono, MN From: Paul Brandt PSS Soil Investigation & Design, Inc. Date: September 12, 2018 Subject: 1795 Fox Street, Orono, MN As we discussed, this design is being considered a type 3/4 by the City of Orono and was reviewed under those regulations. The system has three distinct components. They are the tanking, piping to the drainfield and the drainfield design. The tanking and treatment component design appears to be within prescriptive design. This portion of the design meets or exceeds the requirement of the City of Orono Ordinance and the Minnesota Rule 7080 to 7083. The piping component design appears to be within prescriptive design. This portion of the design meets or exceeds the requirement of the City of Orono Ordinance and the Minnesota Rule 7080 to 7083. The drainfield component design as the City of Orono has indicated is considered to be a type (3) three system. As a type 3 system, it is proposed to remove soil and replace it with washed sand. This solution to the problems indicated in the design appear to be workable under the following conditions. First, no equipment can be driven on the surface of the excavation for the drainfield nor can any smearing, compaction or other activities that could seal the bottom or sidewalls of the drainfield excavation occur. Second, the designer or installer must complete two (2) percolation tests within the excavation to determine the appropriate sizing. This is indicated in both the City Ordinance and in Minnesota Rule. Since this is part of the "advanced design", we must be notified to inspect the soils and the percolation testing in the drainfield. With respect to the management plan as stated, it has several gaps in information. This should be completed and submitted by the designer and/or the installer before completion of the installation. With the provision of completion of two pert test and the management plan, this design is approvable by the City of Orono and the permit can therefore be issued by the City of Orono. Thank you for your time. I hereby certify that I am an advanced designer and am qualified to design/review this work in accordance with all applicable ordinances, rules and laws. Paul Brandt, Lic. # 5182; Soil Investigation & Design, Inc. Lic. #3253 II-I"W-1155