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HV)lO <br />AuGust 20, 1982 <br />Doug ojootrg <br />Pane 2 <br />Critical sizes of the various elements of the system are indicated below. <br />MINIMUM SEPTIC TA' K CAPACITY <br />DRAIN FIELD PIPE DIAMETER <br />SOIL TREATMENT AREA: <br />6“ of rock under drain pipe <br />12" of rock under drain pipe <br />18" of rock under drain pipe <br />DEPTH OF TRENCH BELOIV EXISTING GP-\DE: <br />6" of rock under drain pipe <br />12" of rock under drain pipe <br />of rock under drain pipe <br />1000 Gallons <br />1; inches <br />750 SF <br />6(.<0 SF <br />h95 S? <br />22 inches <br />28 inches <br />32 inches <br />The above date Is based on minimum cover over the drain field. It is <br />recommended that the minimum cover be used in order to allow for maximum <br />benefit through evapo*transplratlon. <br />Given the nature and dimensions of the site, we recommend the drain field <br />be constructed with four each 50 foot drain lines, connected by drop <br />boxes arranged down the slope where the tests were run. The trench width <br />should be 3o Inches and there shoi>ld be 12 Inches of rock under the drain <br />field. Other arrangements meeting the above design criteria of critical <br />sizes can be used. <br />REMARKS <br />The tests and recommendations presented herein were in accordance with <br />proceedures outlined in the Onsite Sewage Treatment Manual, published <br />by the University of Minnesoia Agricultural Extension Service and the <br />Minnesota Pollution Control Agency, 1982 edition. Construction of tlie <br />system should be in accordance with this manual. <br />Veiy Truly Yours <br />TOM SMITH ASSOCIATES INC <br />I hereby cen«ty ihot f!iis plun« speciHcacion, or <br />report was prepared by me or under my direct <br />supervision and Ihof I am o duly ReQllIorod <br />Prolessionol Engineer under the Laws of fte <br />Slate of Minnesota <br />TiiCKiAS K 5^aTH, PE <br />TKS/oas <br />incl <br />THOmVAS Ki SMITH <br />Datt Raq- ^ 9044 <br />/ i <br />TOM SMITH ASSOCIATES Ir / <br />/ 1: