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v S-P TESTING, INC. Steven B. Schirmers • MPCA Cert.No. 627 951 Katydid Lane NE • St. Michael, MN 55376 • (763) 497-3566 FAX (763)-497-5011 IS SYSTEM IS DESIGNED FOR State License #394 BEDROOMS. ANY INCREASE 1N NUMBER OF BEDROOMS INVAUDATES THIS DESIGN. CITY OF ORONO September 27, 2004 SEPTICSERMi PAN REVIEW INSPECTOR." " DATE lo-lc1-O`i PERMIT NO. _ APPROVED AS SUBMITTED APPROVED WITH CORRECTIONS AS NOTED John VanDyck NOT APPROVED-CORRECT&RESUBMIT 2550 Woodhaven Dr. These comments arc for your information. All work shall be dote in full compliance with alt applicable septic and zoning code. Orono, Henn. Co., MN Requirements including items not speciticully noted in thiarevaiw. KEEP TRIS PLAN SET ON SITE AT ALI.TIMES This site has an existing on-site sewage treatment system. The system is a pressurized mound with a 10' x 50' rockbed. A 2 bedroom addition is proposed for the home. An additional 10' x 32' rockbed will need to be added with 1' of sand below the rockbed using soil boring #1 with mottled soil (redox features) at 24" below grade. Soil borings completed found mottled soil at 20" & 24" below grade. Soil borings through the mound found the original soil at elev. 95.4 east & 95.9 west. With the bottom of the rock bed at elev.94.5 west & 93.7 east, this leaves 1.4' & 1.7' of sand below the rockbed. The system meets the required 3' separation from the bottom of the rock bed & the redox features. The existing toe of the mound was found at 13', 14', 19' & 24' from the edge of the rock bed which meets code with a slope of less than 1%. A quart jar test found 1/32" of sediment after 1 hour of settling time. This on-site sewage treatment system is designed for a Type 1, 6 bedroom home, in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances. The soils at a depth of 12" have a percolation rate of 6.7 mpi. The existing tanks are too small & less than 20' from the new addition. The existing tanks will be abandoned, pumped & filled with soil & add 2 new 1250 gallon tanks. The City requires an effluent filter be installed at the outlet of the 2nd tank. The existing pumping chamber may be used if water tight. If not replace with a 1250 gallon tank. The existing pump may be used if it meets 62 gal/min with 31' of head pressure. According to City records, the existing perforations are 1/4", 36" apart. 1