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■ perform four 3-foot-deep percolation tests within the proposed residential area to the following county standards: - a 3-foot-deep test percolate at a maximum rate of 60 minutes per inch to use standard leach lines and - if a 3-foot deep test fails, a soil strata with a maximum percolation rate of 30 minutes per inch to use a sump pit; ■ if any or all of the 3-foot deep tests fail, perform one or two deeper tests (about 8-15 feet deep), depending on the depth to groundwater and soils encountered; ■ if passing percolation tests to a depth of 15 feet are not obtained, document the need for additional percolation tests either below 15 feet deep, if groundwater allows, or at other locations on the site; ■ determine the depth to groundwater by researching existing county groundwater maps, measuring groundwater depth in existing wells on or adjacent to the site, or drilling test borings; and ■ review published maps and depths to groundwater in wells or test borings to determine an approximate groundwater gradient. The septic suitability analysis will include the following: ■ a brief discussion of the potential effects of septic systems on domestic water sources; ■ a plot plan and vicinity map showing the approximately locations of the site, residences and wells surveys, and test borings drilled; ■ copies of San Joaquin County regional groundwater maps, including approximate groundwater gradient; and ■ a discussion of the result of percolation tests and comments for use in standard septic system design. CHAPTER 10. WATER RESOURCES The proposed project involves excavation of two lakes, construction of berms and building pads, diversion and impoundment of storm runoff in Jahant Slough and possibly water from the Mokelumne River, and use of water for domestic purposes and irrigation. These changes could have potentially significant effects on flooding, water use, and water quality. III-11