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1 <br /> <br /> <br />MEMORANDUM <br /> <br /> <br /> <br /> To: Mr. Roger Peitso, Building Official City of Orono, MN <br /> From: Paul Brandt PSS Soil Investigation & Design, Inc. <br /> Date: October 8, 2018 <br /> Subject: 2300 Fox Street, Orono, MN <br /> <br />We have reviewed the information you provided today. We understand that this is a <br />unique location with significant limitations. We reviewed the revised design under the <br />following assumptions: <br />1. The area must be of adequate size to absorb the design flow from the site’s residence <br />which is 750 gallons per day. <br />2. The average contour loading rate must not exceed 12 gallons per day. <br />3. The dispersal area must meet code requirements for orifice size and spacing. <br />4. The dispersal lines must be installed to allow the operator to service the lines and adjust <br />the flow to each line. <br />We have reviewed the submitted revisions; we have found that: <br />1. The area of the dispersal bed is 1,268 square feet which exceeds the minimum bed size of 1,250 <br />square feet. The bed size is adequate. <br />2. The average contour loading rate must not exceed 12 gallons per day. The average <br />contour loading rate calculates to less than 12 gallons per day. The contour loading rate <br />is adequate. <br />3. The dispersal area must meet code requirements for orifice size and spacing. According <br />to the Septic Resources work sheet if the orifice is 7/32 inch with spacing of 3 feet then <br />the distribution is adequate. (Note: other combinations may work but they must be <br />specified.) <br />4. The dispersal lines must be installed to allow the operator to service the lines and adjust <br />the flow to each line. It is unclear if the distribution is center feed or end feed. The <br />distribution appears to be center feed which is acceptable. Due to the layout (uneven <br />lateral length) end feed will not meet code. Further, also unclear the (but because of the <br />unequal number of lateral) a squirt test must be completed. Therefore, each lateral must <br />have valves installed to regulate the flow and pressure in each lateral. <br />With these provisions this design is approvable by the City of Orono and the permit can <br />therefore be issued by the City of Orono. Thank you for your time. <br /> <br />I hereby certify that I am an advanced designer and am qualified to design/review this <br />work in accordance with all applicable ordinances, rules and laws. <br />Paul Brandt, Lic. # 5182; Soil Investigation & Design, Inc. Lic. #3263 <br /> <br />