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FPD r'J JJ t t : JUP Val J nC nrrorarr,n ��'� r "r r' / <br /> t� <br /> 1 <br /> t VJ4V <br /> San Joaquin County Environmental I lealth Department S� G�\c • � i� <br /> February 19, 1999 1 ' b lel <br /> rage z MLI �IeP <br /> A filter bed is proposed due to area constraints. From the west end of lie building,to the <br /> detention basin is 67 ft. Incorporating a 10 ft setback from the building,the arca of the <br /> filter bed will he 45 R by l00P. As with all three proposed projects(Valley Intermodal, <br /> Lawson Trucking and Devine Trucking),a rest period of the specified portion of each <br /> lenchfield is imperative. By using two filter beds 17 ft by 30 ft(510 sq ft)and by <br /> automatically rotating between each filter bed every six months, a sufficient nest period <br /> cart be achieved_ A 100%expansion area wil I be reserved directly north of these two 510 <br /> sq It filter beds. The filter bed area must be cordoned off so that it cannot be parked on <br /> or driven over. <br /> Two — 1600 gallon tanks are to be used in series for this facility. The specified effluent <br /> pump in the last chamber of the second tank will pressurize the effluent which is to be <br /> dosed equally throughout each filter bed for the specified time period of six months <br /> active and sic months resting, Additional design information will lel a forthcoming. m <br /> Hardpan be encountered ppy <br /> araxrmate six feet below grade. This must be <br /> brea— ced to allow adequate eMuent percolation_ <br /> Filter socks should not be used around the Icachline pipes since the exiting effluent Crum <br /> the orifices will be under pressure. However,a filter cloth over the filter beds must be <br /> used to prevent infiltration of fines. Compactionof�subgrade underlying the drain <br /> rock must be avoided. No equipment may be used within the filter bed drainfield. <br /> If there should be any questions or need for additional information,please contact the <br /> undersigned, <br /> Respectfully submitted, <br /> VALLEY AG RESEARCH <br /> Dun Chcsi ey,R-r.A. <br /> -- 2'a y-�g Qfsearc& <br />