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February 27,2002 <br /> Job Number:LG02-048 <br /> Page 6 <br /> .. VI. GEOLOGY, SOILS, AND PERCOLATION TEST <br /> The surface geology at the site is shown on Pages's 5 map and is composed of Continental <br /> rocks and deposits,recent to Miocene age(Plate 5). These deposits are composed of a <br /> heterogeneous mix of generally poorly sorted clay, silty, sand, and gravel; some beds of <br /> claystone, siltstone, sandstone, and conglomerate. <br /> The majority of surface soils located at the site are reported to be the Tinnin loamy coarse <br /> sand(no. 255) (Plate 3)6. A minor amount of Delli sand (no. 141) is located along the northeast <br /> corner of the property. The San Joaquin Soil Survey describes the Tinnin loamy coarse sand as <br /> the following: "This very deep, well drained nearly level soil is on alluvial fans. It formed in <br /> alluvium derived from granitic rock source enneability is rapid in the Tinnin soil.+�Available <br /> water capacity is low. If this unit is used for homesite development, the main limitation is the <br /> rapid penneability, Community sewage systems may needed because seepage from onsite <br /> sewage disposal systems can result in the contamination of water supplies." <br /> The San Joaquin Soil Survey describes the Delli sand as the following: "This very deep, <br /> somewhat excessively drained, nearly level and gently sloping soil is on dunes. It formed in <br /> wind modified alluvium derived from granitic rock sources. In most areas, slopes were mostly 2 <br /> to 7 percent prior to excessive land leveling. Permeability is rapid in the Delhi soil. Available <br /> water capacity is low. If this unit is used for home site develonment,_the main limitation is the <br /> rgpid permeabili!y in the substratum. Community sewage systems may be needed because <br /> seepage from onsite sewage disposal systems can result in the contamination of water supplies." <br /> Table 3 presents some selected properties of the Tinnin loamy coarse sand and the Deli fin sand. <br /> 5 Page,R.W., 1986,Geology of the fresh ground-water basin of the Central Valley,California,with texture <br /> '— maps and sections:U.S.Geologic Survey Professional Paper 1401-C,Scale 1:500,000. <br /> 6 USDA Soil Conservation Service,Soil Survey of San Joaquin County,California, Sheet 31. <br /> ?OERSO <br /> � 1 <br /> > w <br /> Z � <br /> O � <br />