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I. INTRODUCTION Chesney Consulting has been retained by Mr. and Mrs. Peter and Rena deVisser of deVisser Dairy to complete the septic system requirements of the San Joaquin County Environmental Health Department (EHD) for their new dairy barn. The subject property is located at 21268 East Avena Road near Escalon and deVisser's are currently in the process of building a new milk barn since the existing barn has outlived its useful life. Plans for this new milk barn are being designed and drawn by Jason Toste, PE of Provost& Pritchard Consulting Group. These Plans reference this report. The milk bam will have one restroom near the northeast corner of the building. Only one toilet and one sink are proposed. The EHD typically requires that a Soil Suitability Study (SSS), which includes applicable percolation testing, be conducted for new projects or parcel subdivisions. Although this report is not classified as a Soil Suitability Study, it does contain disposal area soil descriptions, percolation testing and design parameters of the disposal structures (septic tank, leachline, and seepage pit). The decentralized wastewater management(septic) system designed for this project is primarily predicated upon the fact that wastewater flow volumes from the restroom serving the new milk barn will be extremely small. Typically, there are only two milkers in the barn at any time the cows are being milked and the cows are not milked continuously. II. SEPTIC SYSTEM DESIGN AND OPERATIONAL CRITERIA A. Soil Percolation Testing and Septic System Operational Overview Soil Percolation Test Results Pursuant to the requirements of the EHD, soil percolation testing was conducted 30 ft west of the proposed location of the future leachline. Testing could not be conducted in the exact location of the proposed leachline since cows were in corrals in this area. As discussed and agreed upon with EHD, a single, shallow perc test was conducted at a depth of 36 inches. This test depth reveals data and information on the leachline structure that will initially and primarily manage septic system effluent. The soil characteristics at the 36-inch depth are a reddish brown, silty, medium sand that was near saturation due to recent heavy rains. After perc tem, the boring was extended to 5.5 ft where a hardpan stratum was encountered. This stratum most likely prompted the near soil saturation as percolating rainwater congregated above this slower permeable hardpan. Twenty-four hrs after pre-saturation, 3.6 inches if water remained in the boring, so the test boring accepted 2.4 inches of water over the 24-hr time period. At the start of testing,the boring was refilled to six inches. As noted on the attached Percolation Test Form, the test boring never exceeded a perc rate of 250 minutes/in during the four-hour test. Page -2-