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g A "review of Application Permits on file with the San JoaquWto'unty Environmental;Health N Department indicates there have been f ve Applications for Repairs/Additions to septic systems on V Banta Road, within the one-half mile radius study area.-These applications for repairs to existing systems were for additional leachline drainage. However,two of these permits were for the All Pure Clemical Company where there have been a number of septic system failures. According to records h at PHS-EHD these failures have been primarily due to excessive use of an undersized septic system bya large number of employees. Five septic system repairs/additions along this comparatively short distance of Banta Road can be.considered a medium number when the All Pure Chemical facility is considered. It is evident;according to the perc test results as illustrated below, that the shallow soil is conducive for acceptable, long-term sewage effluent management. _ a v [3] .SOIL PROFILE AND PERCOLATION_ TESTING y` The United States Department of Agriculture (USDA) Natural Resources Conservation Service indicates the underlying; on-site soils consist of a Capay clay,-wet,0 to 2:percent slopes (4121). Although we observed sticky surface soils which are characteristic of a'clay :type soil, slow ,percolation normally,associated with clay soils was not observed. An El Solyo clay loam(#156)is z= the soil type found to the north of the property and a Capay.clay 0 to 2 percent slopes(#18 8)is found I to y,the south. - A.-Well Driiler's' Log closest to the .subjectproperty that was on file at: the Environmental Health Department shows underlying strata to be predominately clay down to 25 ft, as classified by the well driller. The subsurface soils encountered in the percolation test.borings are composed of a fine sandy silt/silty sand. These soils-did not exhibit granularity such as one would`find with a sand, but obviously from the perc test results, the soil contains substantial porosity. = _ Percolation tests were conducted on the subject Parcel in the existing leachfield area. A Log of .uBoring for No. 4 percolation test'hole:accompanies the-FIELD PERCOLATION TESTING s -REPORT and illustrates-the subsurface soil characteristics to the-test depth of 40 inches. Percolation °testing was conducted in accordance with'San Joaquin County Environmental Health Department ' Rules and Regulations and the EPA Design Manual for On-site Wastewater Treatment and Disposal S, stems_. Two test borings were drilled by hand at the north(Pert Test No. 1)and at the south(Pere LL a Test No. 2) ends of the existing'leachfield.- The perc tests were conducted at approximately 40 inches below grade;which is near the maximum Ieachline depth :Testing commenced on November _ 30�after overnight soaking'. The FIELD PERCOLATION TESTING REPORT illustrates the perc readings were conducted over a four-hour period, with the perc rates calculated from the last 30 _ minute readings..Final perc rates were 6.3 and 7.1 minutes/inch(min/in)for Test No. 1 and Test No. 2,respectively, indicating soil homogeneity. PaRe--2' �: - va-ffey.Ag Research