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`.e 6. SEPTAGE ENVIRONMENT AND PERCOLATION TESTS The history of development in the area consists of two phases roughly delineated in the late 1980's. Prior to this date the area was prodominantly agricultural. During this time the residence on proposed parcel 4 was constructed as well as the residence adjacent to the project area on the west. Examination of the files at San Joaquin County Environmental Health Dept. did not discover the permits for either system. Both were, ostensibly, installed in the 1960's or before. According to the residents the systems have operated well without undue maintenance. The system at the Palesch residence, according to the owner, has required pumping once during its use, since 1965. During the period since 1988 the development of homesites in Oakwood Estates, a subdivision adjacent the area north of Gawne Road has resulted in the installation of a large number of residential septic systems typified by the installation of pits as well as drain fields due to the soil characteristics of the area. Ideally the development in the area would support a small sewerage treatment facility of the "package plant" variety through the formation of a area of benefit. Politically this is probably infeasable. The septic percolation test was performed under permit # 011192 on June 2, 1997. Test holes of 42" depth were dug on parcels 1 and 8, 150 feet south of the Gawne Road right of Way and 150 feet east of the west line of each parcel. Observable soil type was adobe clay of the type mentioned in the soil classification section of this report. In both holes the initial percolation rate approached 2 inches per hour tapering off to an unmeasurable amount after a period of two hours. Subsequent to the discharge of the initial loading both holes percolated at one half inch per hour which is typical of the soil type. It is our recommendation that drain fields in both cases be terminated in pits.