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(31 PROPOSED DEVELOPMENT OF THE SUBJECT SITE It is proposed to subdivide 10.7 acres to create four rural residential lots on the north side of Linne Road, each parcel consisting of between two and three acres. A tentative map is attached and illustrates the subdivision and the acreage for each parcel. Each parcel will have a residential dwelling, one domestic well and an individual septic system. There is a hole approximately two feet in diameter at the north end of the subject property of unknown origin. The hole's depth was indeterminable and it is presently covered with boards. 141 SOIL PROFILE AND PERCOLATION TESTING An exploratory boring performed in the center of the subject property indicates a slightly varied soil structure throughout the soil profile. The predominate soil type from grade to 10 ft is a silty, very fine sand. The silt content of the soil increases slightly with depth, to a medium sandy silt at boring termination. A hardpan layer was not encountered but may exist in the regional location of the subject property at variable depths. A gravel pocket was also encountered in one of the borings at a depth of approximately three feet in which there was auger refusal. Subsurface gravel and cobble are prevalent in the southern locations of the Tracy area and is mined in this locale. During the drilling process for the shallow (48") percolation test holes, the soil structure was carefully analyzed. This depth represents the maximum depth of a leachline trench where effluent percolation or "wetting front" will occur in native soil. Therefore, perc tests were performed at this approximate depth. Our percolation tests were conducted according to San Joaquin County Department of Environmental Health regulations. The Field Test Data Sheets with the percolation test results can be found in the Appendix. As referenced, the 36 to 50 inch soil profile for all four parcels consists of a very fine sandy silt, silty sand soil structure. Due to these favorable perc rates at the shallow depth, deep perc tests were not performed. A discussion of these rates, and septic system design recommendations will follow in the Conclusions section of this report. �� Quality (9ontr01 Imptdio"