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LnRliY RADER <br />HEVIDED SYiiTEM DESIGN <br />LOT in, BLOCK 1 <br />ABINGDON GLEN <br />l}-2-0l4. <br />1. Percolation Rato, Type of Syateni. <br />14.1 minutes per Inch for the new primary sitefholes 7“9). <br />Use shallow trench system with trenches no deeper than 2.0 <br />feet in the natural soil. Use the old primary site as the <br />new alternate site. <br />2. Proposed Flow Rate. <br />5 possible bedrooms 1^0 G.P.D. is 750 G.P.D. <br />3. Soil Treabiiient Area Required. <br />Use 1.67 percolation rate factor x 750 G.P.D. for 12^0 Sq. Pt. <br />)|.. Size and Number of T^^cnches. <br />)4- trenches 3 feet wide and IClj feet long is 1250 Sq. Pt. <br />These trenches would be spaced a minimum of 7*5 feet a|uirt <br />center to center. <br />5.Drainfield Rock Needed. <br />69.5 cubic yds. of rock is needed bo have 12 inches under and <br />2 inches over a 4 inch distribution .pipe. <br />6. Septic Tanks. <br />Two tankn each of 1000 gallons are recommended. It addition, <br />it will ‘be necosaary to have a pump in a third pumping tank <br />in order bo reach the higher drainfield area. An alarm device <br />should be used bo warn of j'ump failure. <br />Sincerely, <br />PERGOR, INC, <br />I'iarlt C. Gronberg, P.E.