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NJ <br /> August 22, 2007 <br /> NOA Project Number: E07109A <br /> 1.2 Mass Transport Soil Properties and Additional Percolation Tests <br /> 4 4 Five shallow percolation tests and an 8.5-foot groundwater boring were performed on the site on <br />+ July 26, 2007. The soils from the surface of the ground to a depth of approximately 8.5 feet was a <br /> Idark grey clay with some silt. The percolation tests were conducted for the shallow borings on the <br /> F'1 site on July 27, 2007 in accordance with the requirements of the EHD. A percolation test with a <br /> duration of four hours was performed for each hole. Please see Gl on the Design and Layout of <br /> the septic system for more details regarding location of the percolation tests. The last half an hour <br /> swas observed by Mr. Nick Weisman, of the San Joaquin EHD. The results of the percolation tests <br />' are shown in the table below. <br /> Table 1. <br /> i <br /> Surnmary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> F Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) <br /> P-1 <br /> 7-27-07 3.8 125 4-hr Failing Perc Rate <br /> F P-2 6.76 4-hr Satisfactory Percolation Rate <br /> } 3262 7-27-07; <br /> 7-227-7-07 \1235 <br /> 2,75 8.62 4-hr Satisfactory Percolation Rate <br /> P-4 <br /> 7-27-07 3.2 8.06 4-hr Satisfactory Percolation Rate <br /> \J <br /> ! F <br /> 7-P-5 <br /> -27 07 2.12 11.9 4-hr Satisfactory Percolation Rate <br /> 1 r <br /> Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch <br /> 4 1.3 Discussion of Percolation Test Results <br /> The soil within the proposed sewage disposal area has demonstrated a satisfactory percolation rate in <br /> accordance with the requirements of the EHD for the use of a standard septic system utilizing a / <br /> filter bed. <br /> The percolation tests have revealed that the soils are moderately permeable. Layered soils and <br /> sediments, such as the some fine-grained soil layers found on the site, typically provide a degree of <br /> protection between percolating effluent at the surface and shallow ground water aquifers. Soils of <br /> this type do not typically present a high risk of excessive mass transport of nitrate or other <br /> constituents of concern. <br /> f <br /> Fi <br /> 4 <br /> P <br />