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< i <br />n <br />r <br />•f: <br />I <br />li <br />t; <br />1 <br />L <br />I. <br />1 <br />L <br />L <br />I <br />Page 8 - #120 86-74 <br />4S0 gallons, based on a three bedroom, Type I residence, the required total <br />treatment area Is about 570 square feet. <br />We suggest scarifying (tilling) the surface sod and then bringing in about 2’ <br />of sandy loam, loam or sand with about lOX fines. The fill material should <br />only rtfcelve light compaction, sufficient to achieve a density equivalent to <br />long-term settlement under its own weight. After the fill placement, trench#* <br />should be dug to a depth of about 2'-2J', and these should be about 3' In <br />width. About 9" of filter rock should be placed below the perforated lateral* <br />For 3' wide trenches, the total trench length should be about 190'. Four-4«' <br />long trenches spaced about 6* apart (7J‘ on center) would require filling in <br />area of about 70' x 50' for the primary system. About 26 cubic yards of <br />filter rock would be needed. Where any trench extends to within 8* of a tr#§ <br />or potentially large tree, additional filter rock should be placed. <br />Uf strongly discourage the use of a garbage disposal. Traffic of all types, <br />except for occasional mowing of the grass with light equipment, must be <br />restricted throughout tho year. The system should be monitored and the septic <br />lank should be pimiped, probably every two years or so, to promote longivity <br />of the soil treatment systai. The existing sprinkler system must be removed <br />from the new drainfield area. <br />FIELD EXPLORATIOW PROCEDURES <br />The borings were mad# on April 17, 1985. The borings were put down at the <br />locations suggested by you or discussed with you as shown on the attached <br />i