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W t <br /> I^ <br /> March 30, 2005 <br /> NO Project Number: EO5041 A <br /> Page 2 <br /> for a period of one hour. This test was a non-conforming percolation test according to EHD <br /> standards. The test was non-conforming due to it's shallow depth due to the shallow depth of <br /> ground water. A permit for a percolation test was submitted to the San Joaquin County <br /> Environmental Health Department and an inspector witnessed the percolation rate during the test. <br /> Summary of Percolation Test <br /> Test No., Percolation Percolation Rate Test Comment <br /> Date Tested Test Depth(ft) (minutes/inch) Duration (see notes)#1 <br /> #1 Shallow,3-29-05 1.5 < 1.7 1-hr Rapid rate. <br /> Even though clayey soils were found to exist in the subsurface, the percolation rate was fairly <br /> rapid. We believe this may be due to the fine layers of organic material existing between the <br /> clayey layers.. <br /> Disposal Field Design <br /> The engineered septic system essentially followed the "mounded" septic system outlined in the <br /> San Joaquin County Environmental Health Department Sewage Standards. Sewage Standards in <br /> section 8.9.3 a., indicates a 4-bedroom house should contain a 5,000 square feet disposal field. <br /> As prescribed in the Sewage Standards, the EPA Design manual was consulted. Some of the <br /> relevant design elements were applicable for this site. The disposal area"footprint"of 5,000 SF is <br /> the sandy layer below the gravel filter rock. The attached design plans shows the location and <br /> details of the septic tank and disposal field. The aggregate specifications are noted on the plan. <br /> Septic Tank <br /> According to the requirements of the EHD, the septic tanks must be set above the flood plane. <br /> We recommend the minimum tank size for this project should be 2,000 gallons. if available, a <br /> monolithic tank should be used. This size should provide adequate retention time to settle out <br /> suspended matter. <br /> N <br /> Recommendations <br /> Please refer to the attached design plans for the design details. The proposed septic system <br /> should be permitted and installed according to the San Joaquin County Environmental Health <br /> Standards. We recommend the mounded disposal field be planted with grass or other soft rooted <br /> plants. Hard rooted.plans can damage the underground piping. Minimal irrigation should be <br /> used on the mound if necessary. <br /> `1 <br />