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4.3 GEOLOGY AND SOILS <br /> TABLE 4.3-1 <br /> PERCOLATION TEST RESULTS <br /> TEST TEST ADJUSTED <br /> HOLE HOLE DEPTH RATE (MINUTES SOIL <br /> NUMBER (INCHES) PER INCH) TYPE <br /> P-1 22" 23.4 San Joaquin <br /> P-2 24" 2.8 Kimball <br /> P-3 42" 2.9 Columbia Tax <br /> Adjunct <br /> P-4 24" 13.4 San Joaquin <br /> P-5 30" 3.0 Bruella <br /> P-6 42" 1 23.4 Typical Fluvaquent <br /> Average Percolation Rate 11.5 <br /> Source: Questa Engineering Corporation, November 1991. <br /> TABLE 4.3-2 <br /> SOIL SUITABILITY FOR ON-SITE SEPTIC SYSTEMS <br /> CLASS A Soils have favorable conditions or few limitations that would restrict their use for <br /> on-site septic systems; no limiting hardpan layer or groundwater within 5 to 10 <br /> feet at ground surface. <br /> CLASS B Soils have moderate limitations for use of on-site septic conditions due to slow <br /> permeability and moderate depths (3 1/2 to 5) to hardpans. <br /> CLASS C Soils have severe limitations for use of on-site septic systems due to shallow <br /> depth (less than 3 feet) to very slowly permeable hardpan or clay layer. <br /> CLASS D Soils have severe limitations for use on on-site septic systems due to high <br /> groundwater levels; within 2 to 3 of ground surface. <br /> 4.3-5 <br />