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r.r r..i <br /> A percolation rate (actually the inverse of a rate) "faster" than 5 min/in requires modification to the <br /> disposal effluent interface soils. These changes are also pursuant to EHD regulations and EPA J <br /> regulations found in the EPA Design Manual- Onsite Wastewater Treatment and Disposal Systems. <br /> A summary of the perc test result with corresponding application rate in gallons of effluent accepted-- <br /> per square foot of soil, per day are found in Table 2 for proposed disposal area: <br /> TABLE 2 <br /> PERCOLATION TEST RESULTS FOR THE DISPOSAL AREA <br /> WITH CORRESPONDING APPLICATION RATES IN <br /> GALLONS / FV/ DAY <br /> 40 INCH DEEP PERC TEST BORING: 3.2 n/inch / 1.2 gallons/ft2/day <br /> PERCOLATION RATE/APPLICATION RATE Note: The soil material to be imported to the <br /> floors of the leachline trenches should have an <br /> Application Rate of approximately 0.593 <br /> gallons/ft'/day based upon the Soil Particle <br /> Analysis test results for a Clay Loam. <br /> Application Rates adapted from: California State Water Resources Control Board Guidelines for the Design of Sewage Systems. <br /> TABLE 3 <br /> SOIL PHYSICAL CHARACTERISTICS-PARTICLE SIZE ANALYSIS <br /> ANALYTICAL TEST RESULTS OF IMPORT SOIL LINER <br /> SAMPLE LOCATION, SAND,SILT AND CLAY PERCENTAGES SOIL CLASSIFICATION <br /> SAMPLE DEPTH AND <br /> (SAMPLE NUMBER) <br /> STOCKPILE 29%,40%,31% Clay Loam <br /> (STCKP) <br /> D. GROUNDWATER INFORMATION <br /> NLS§ 2.1,=SSS§ 4.1. Groundwater depths and elevations throughout San Joaquin County are <br /> illustratds�on maps published by the County Flood Control and Water Conservation District. The <br /> most recent\Lines of Equal Depth map (1999) indicates the groundwater depth to be approximately <br /> 22 feet. TWs groundwater depth corresponds with the sounding of the on-site domestic well. The <br /> 2003 Lines of Equal Elevation Map illustrates the groundwater directional flow to be generally in a <br /> north-northwesterly direction. <br /> A well log for a domestic well near the subject property illustrates varied geological strata of clay, <br /> sand and some shale down to a depth of 180 feet. Standing well water levels measured in nearby <br /> wells in 1988 were found to be 20 ft; in 1986 - 16 ft, and in 1975 to be 18 ft. Groundwater research <br /> in the scientific literature suggests there may be significant denitrification potential within aquifers or <br /> saturated zones composed of a fine clay soil fraction. <br /> 5 <br /> Chesney Consulting <br />