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Working to Restore Nature <br /> the western property boundary No septic tanks or leachfields are located near the site <br /> There are no municipal, domestic, or irrigation water wells within 500 feet of the site Data <br /> obtained from the California Department of Water Resources indicate water-supply wells <br /> are within 1/2 mile of the site. The wells are listed in Table 1 and depicted on Plate 1 <br /> Some of the wells are probably inactive, and other wells may exist near the site but do not <br /> appear in the records <br /> 3.0 LOCAL GEOLOGY AND HYDROGEOLOGY <br /> The site is underlain by the Modesto Formation, which is composed of alluvial sediments <br /> that ranging from silt to gravel (Marchand and Allwardt, 1977) The Modesto Formation <br /> dips gently to the west (Wagner, et al , 1981) <br /> The site is in the Eastern San Joaquin County Ground-Water Basin (California Department <br /> of Water Resources, 1988) According to personnel of the San Joaquin Public Health <br /> Services, the direction of regional groundwater flow is to the southwest and the depth to <br /> groundwater ranges from 45 to 50 feet below surface grade (bsg) The groundwater basin <br /> has been developed for intensive irrigation, domestic, industrial, municipal, and stock use <br /> 4.0 SCOPE OF INVESTIGATION <br /> Work was conducted at the site according to Work Plan 30003-1W (Applied GeoSystems, <br /> Inc , May 17, 1991), Addendum Work Plan 30003-4W (RESNA, November 18, 1991), <br /> Addendum Work Plan 30003-7W(RESNA,June 1, 1992) and Addendum Work Plan 30003- <br /> 1OW (RESNA, October 20, 1993) The field methods for work performed by RESNA are <br /> described in Appendix A. <br /> -AOW3-7 3 <br />