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Working To Restore Nature <br /> hardpan and yellowish brown loam In some areas the surface layer is silty clay or silty clay <br /> loam The permeability is low in the Jacktone soil <br /> Deeper lithology and site geology is related to the surface soils <br /> 1 <br /> The site is mapped by the U S Geological Survey as "basin deposits " Basin deposits have <br /> tlithologic profiles dominated by fine-textured materials However, intercalating layers of coarser <br /> textured materials are common and usually capable of freely releasing water Municipal water <br /> ' wells drilled in the general area penetrate through alternating clays and sands to a depth of 250 <br /> feet or more before intentionally extracting water Municipal wells are sealed off for the first <br /> ' 250 feet because the upper zones of saturation do not meet quality standards or do not provide <br /> ' sufficient quantity to be developed (Bulletin 146, California Department of Water Resources, <br /> 1967) Therefore, it is highly unlikely the fuel components at this site have affected or will <br /> affect drinking water supplies <br /> Two main waterways run within 1'/2 miles of the site, the San Joaquin River to the southeast and <br /> the Calaveras River to the north Both of these rivers are in hydrogeologic continuity with the <br /> ' local groundwater system <br /> ' There are three irrigation wells on the subject property One irrigation well is located 65 feet <br /> south of the former tank locations (IRR2), the other two are located 650 feet north (IRR3) and <br /> ' 550 feet south (IRR1) of the former tank locations All water for the site including sinks and <br /> restrooms in the office is supplied by the irrigation wells with the exception of drinking water, <br /> ' which is bottled Also, a septic tank/leach field system is located to the southwest of the tank <br /> area One irrigation well 1s shown on Figure 2 <br /> First groundwater is present between 60 and 70 feet below grade Natural Groundwater gradient <br /> direction would be expected to be north-northwesterly, towards the Calaveras River A long <br /> 150041WEPORTSVSR-0694 FNL 2 <br />