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Y � TABLE 8 SOIL PROFILE CHARACTERISTICS AND ANALYTICAL TEST RESULTS FOR NITRATE-NITROGEN PARCEL/ SOIL DESCRIPTION SAND,SILT AND CLAY SUBSURFACE SOIL NITROGEN SAMPLE/ PERCENTAGES CONTENT LOCATION Home Ranch Sample No: Sandy Loam 61%,220/o, 1714, ??ppm NO,-N "FLF42" 42 Inch Depth Future Leachfield Home Ranch Sample No: Loam 49%,28%,23% N/A "MSP" +� Manure Storage Pad 2. PERCOLATION TESTING Percolation testing was performed in accordance with San Joaquin County Department of Environmental Health regulations. The location of the percolation tests are denoted on the FIELD PERCOLATION TESTING REPORT and also illustrates the perc test boring depths, diameters and results. Two test borings were drilled on January 20, one to 24 inches in depth representing percolation that may occur from a filter bed disposal arrangement and another test boring at 42 inches in depth, representing percolation from conventional leachlines. The test holes were drilled by hand with a four-inch auger, scored, and the cuttings removed, two inches of pea gravel added, perforated PVC pipe installed, and the borings pre-saturated. The percolation test results reveal equivalent perc rates of 31 minutes per inch (mpi) for both the 24-inch deep boring and the 42-inch deep boring. This can be considered a medium, or average perc rate and is indicative of a soil with an approximate 17% clay and a 22% silt content. 3. SEPTIC SYSTEM PARAMETERS The groundwater table is too shallow for seepage pits since there must be a 10-foot distance between the bottom of the seepage pit and the highest anticipated depth to groundwater. Since the mobile home directly west of the proposed location of the new milk barn will be removed, there should not be leachfield area constraints. However, if constraints arise, a filter bed arrangement may be considered since a filter bed already serves the de Snayer's residence. Calculations for a filter bed area, based on the San Joaquin County EHD Sewage Standards are as follows: Approximately 12 employees x 15 gpd= 150 gpd. 1200 BTC + 180 ADF= 1380 x 0.225 SF=311 lineal feet of Leachline x 4 for clayey soils= 1,242 sq. ft. Therefore, a filter bed 35 feet square may be used as a disposal field. There is currently a mobile home directly west of the proposed location of the new milk barn which has a septic tank and leachfield. It has been proposed by the Applicant's representative, Mr. Hank Wallenburg, to pipe the influent from the milk barn bathroom into this existing septic tank and leachfield system. -15- Che sney Consulting