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W.,II~TE DISPOSAL SYSTEMS M/ RION COUN 'Y <br />1242 31~ Ct, N.W, BUiLD~NG <br /> ~7470 April ZT, 1992 <br /> <br />Lee Grimes <br />Marion County 9uildinc Dept. <br />220 High St. <br />Salem~ Or. 97301 <br /> <br />[e: Drainfield layout and design. <br /> <br />WilZiam Tucker application <br />lots 17 & 18 Block 9 <br />.Halamond Addition to Detroit. <br /> <br />Attached you will find a drainfield layout plan for Mr. Tuckers <br />proposed site in Detroit. This lot is proposed to be used <br />primarily for recreational purposes, This lot was created prior <br />to January 1, 1974 an& Mr. Tucker can provide a copy of the deed <br />to verify this. <br /> I have contacted Kevin Hill and he should have test holes on <br />the site dug hy now but this will be confirmed. <br /> The drainfield lines have been staked out on the property as <br />shown in the plot plan and the elevations relate to the water <br />valve box by the N.W. property corner. <br /> ! have calculated that the dralnfield requirement for the <br />initial system should be approximately 134' These calculations <br />are as follows: <br /> Lencth = 4 X standard trench/3 + rock depth under pipe <br /> Estimate soil in group ~ with depth of 36" to 46" which <br /> would require 100~ per bedroom. <br /> 4 X 100'/3 + 1.5 (2)=400/6.00 = 66.7' per 150 cal. <br /> flow. This should be approximately 134' required for the <br /> primary system. <br /> A sand filter/seepage trench repair system is proposed an~ <br />us/nC the above formula ~ith 45* used for the standard drainfield <br />portion of the equation~ this should calculate to approximately <br />30' of trench required per 150 callons or room for a total of 60 <br />lineal feet of replacement area. <br /> Please review these calculations and the on$ite stakeout and <br />let me kno~ if you need anythin~ else. The above is based on <br />soil conditions that have been found on other lots in the area <br />and I hope they prove to be accurate. <br /> <br /> <br />