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[2] Cont. <br /> A review of Application Permits on file with the San Joaquin County Environmental Health <br /> Department indicates there have been seven Applications for Repairs/Additions in the one mile <br /> diameter study area. These applications for system modifications were primarily for additional <br /> drainage to existing systems. Also, two well logs were reviewed which illustrated the deep <br /> subsurface soil strata. <br /> °— [3] PROPOSED DEVELOPMENT OF THE SUBJECT SITE <br /> As referenced, it is proposed to divide an 80 acre parcel into two 40 acre parcels, Parcel No. 1 <br /> being ±40.0 acres and Parcel No. 2 consisting of±40.0 acres. It is our understanding there is to <br /> be no development or improvements made to either of these Parcels in the foreseeable future. <br /> However, if any structure is built on either Parcel, we recommend a perc test be performed in the <br /> proposed location of the septic system. All related septic system structures and the domestic well will <br /> have to comply with the published "distance" requirements. <br /> [4] SOIL PROFILE AND PERCOLATION TESTING <br /> The predominate soil type from grade to 10 ft is a silty, fine-to-medium sand. The sand content <br /> of the soil increases slightly with depth, to a medium silty-sand, sandy-silt at boring termination. <br /> A hardpan layer exists in the regional location of the subject property at variable depths. This <br /> hardpan layer was encountered in our percolation borings at approximately 4.0 to 4.5 feet. <br /> During the drilling for a shallow (42") percolation test hole, the soil structure was analyzed at this <br /> depth, which represents the maximum depth of a leachline trench where effluent percolation or <br /> "wetting front" will occur in native soil. It was determined that this 42 inch depth would not <br /> produce an acceptable percolation rate. Therefore, perc tests were not performed at this depth. <br /> Q.-lity ('ontrol Jnspection <br />