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IJ.ll MljMMIIWl <br />I both <br />5.8* - <br />s “ maximum <br />* - water <br />maximum trench <br />(primary <br />ing not en- <br />ard trenches <br />1 <br />- water <br />trench depth <br />I (primary <br />ntered - water <br />4.3', water <br />rench depth 16" <br />MPI both sites <br />5.9', water <br />ximum trench <br />, water table <br />lum trench <br />both sites <br />■ water table <br />- water table <br />^ - maximum <br />ow re modified <br />►I both sites <br />;.0' - water <br />■ '^^11 <br />• • <br />,5*1 <br />i{9r <br />.ft; <br />f <br />HkdM A <br />‘i'-M <br />r <br />Jeanne A. Mabusth <br />June 15, 1983 <br />page 3 <br />table at 4.5', 5.3' " shallow trenches - maximum trench <br />depth 18" into original soil ,.09. waterTV-14. ci-hp — slops 6% •“ inottlsd st 3*8 # wausr <br />' tabl^at 3.8' - modified shallow trenches" - maximum <br />trench depth 10" into original soil <br />Lot 4 Block 2 Percolation Rate Average 14 both sites <br />- Primary site - slope 7% - mottling at 4,4 , 5.5 <br />water table at 4.4', 5.6' - shallow trencher - maximum . <br />trench depth 17" into original soil _ <br />- Alternate site - slope 5% - mottling at 4.0 15" <br />table at 6.4’ - shallow trenches - maximum trench depth 1 <br />into original soil. <br />"Modified Shallow Trenches - whep water table or mottling <br />is between 3.0' and 4.0’ below the surface, a standard <br />12" rock depth (6" under pipe, 2" <br />conjunction with an appropriate depth of f^ materi <br />to retain a 3.0' separation between the bottom or trenc e <br />and the water table or mottling. Fill should consist of <br />material classified as loamy sand (USDA * <br />The original soil must be dryer than the plastic limit <br />before placing fill. The original Th“^ ^or disced to break up the surface vegetation mat. The <br />?Lm^ sand ?ill must be placed over the entire area so that <br />no trench will be located less than 10 from <br />the fill. The depth of fill requiied will depend on the <br />allowable depth of excavation into original soil based on <br />the water table or mottling. <br />I recommend that t" ; subdivision be approved as . <br />developer should be warned to keep all traffic, fill excavation, <br />etc awly from the tested drainfield sites. In some cases <br />where road construction will be near the tested sites, ex ra <br />caution must be taken. <br />MPG;j1