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Soil Suitability&Nitrate Loading Evaluation CTE Job#25-1084G <br /> New Septic Leech Lines <br /> 21850 East Liberty Rd <br /> Clements, California <br /> January 30, 2021 (Revised 1/17/2022) Page 4 of 9 <br /> 7.0 SOIL PROFILE <br /> Published (USDA, Soil Survey of San Joaquin County, California, dated October 1992) mapping <br /> indicates soils at the site consists of "Pentz Sandy Loam" described as sandy loam underlain by <br /> bedrock in the Northwest area of the site, "Kaseberg Fine Sandy Loam" in the Southwest area of <br /> the site and is described as a fine sandy loam underlain by weathered bedrock, and "Pardee Cobbly <br /> Loam" in the East side of the site which is described as a cobbly loam underlain by weathered <br /> bedrock. The septic tank absorption field rating for the above soils is indicated to be "very <br /> limited" due to the soils generally have a very slow infiltration rate. Based on published geologic <br /> mapping --"Geologic Map of the Sacramento Quadrangle" (CDMG Map Sheet IA, 1981) the site <br /> is indicated to be underlain by the Mehrten Formation (Tm). Such deposits are considered to be <br /> consistent with the USDA soils on site and Hydrologic Class "D"—having very low infiltration <br /> rates. <br /> The percolation test holes (P-1 through P-3) encountered soil profiles consisting of sandy low <br /> plastic clays with gravel (CL) to the maximum explored depth of 36 inches below existing ground <br /> surface (begs). Soils encountered in the borings are considered consistent with published mapping <br /> described above. The soil material type presented on the percolation test data sheets represents the <br /> soil material type present at the depth in which the percolation testing was conducted. Percolation <br /> data sheets are contained in Appendix-A. All test holes were backfilled and surface restored to <br /> original condition upon completion of testing. <br /> 8.0 PERCOLATION TESTING <br /> Our subsurface investigation included conducting leach field soil suitability evaluations via <br /> percolation testing. The evaluation included the drilling and testing of three percolation test holes <br /> performed at a depth of 36-inches, one at the proposed (P-1) back up leach field location, one at <br /> the proposed (P-2) leach field location, and one at the proposed storm drain retention basin. The <br /> field testing for the leach fields were performed under San Joaquin County EHD "Onsite <br /> % M <br /> 7CAALI .INC <br />