Laserfiche WebLink
David Ryerse <br />System Design <br />1. Percolation Rate, Type of System. <br />10.7 minutes per inch. Shallow Trench System. <br />2. Proposed Flow Rate. <br />5 bedrooms ^ 150 OPD is ?50 GPD. <br />3. Soil Treatment Area required. <br />1.27 percolation factor x 750 GPD is 950 So., Ft. Minimum. <br />4. Size end Number of Trenches. <br />3 trenches 3 feet wide and I06 feet long is 950 Sq. Ft. <br />If it is determined that the present trenches are still <br />suitable but Just not enough sq. ft., then that area <br />could be subtracted. The new trenches would be spaced <br />a minimum of 7.5 feet apart center to center. <br />5. Drainfield Rock Required. <br />35 cubic yds. of rock is needed in order to have 6 inches <br />under and 2 inches over the 4 inch diameter distribution <br />pipe. Also* at least 6 inches of sandy loam or loamy sand <br />fill will be required to be placed before trench construe <br />tlcn. The original should be scarified before placing the <br />fill* and the fill should extend at least 10 feet outside <br />the edge of the trenches. <br />6. Septic Tanks. <br />The present tanks should be checked to see if they are <br />acceptable. If not, 2 tanks of at least 1000 gallons are <br />needed. Gravity flow should be possible to the site. <br />, >v'," ■ 3 <br />t-F-*