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REAM FINDINGS Water Supply Well Survey A water supply well survey was conducted through the California Department of Water Resources (DWR) to identify documented supply wells within a 1/2-mile radius of the fi site. Nine documented domestic and agricultural wells were identified within the area examined (Table 4, Figure 1). The closest well is approximately 400 feet southeast of the site and is used for domestic purposes. Three additional domestic wells were documented without precise Iocation by DWR;and it is not known whether any of these are within 1/2-mile of the site. f I3uring.ihe course of this tirvesti prion, an undocumented supply well was ideAtifiad an r site This yvellhas been designated WSW-1 by'PACIFIC. Site personnel identified the r t ; use of water from WSW-1 as being primarily for sanitation, and stated that`the water is riever used for human:.consumptron. Well construction details were not available for. G WSW-1. b Subsurface Conditions i The soils underlying the site are predominantly fine grained. These fines vary from silt } to clay and range in color from blue green to yellow brown. Sands were observed in each of the borings for Walls LT-1 through U-3. The sands occurred at depths ranging from approximately 17 to 25-1/2 feet below ground surface and the thicknesses of the ` sands ranged from 1-1/2 to 5 feet. Further details of the lithologies underlying the site may be found in the boring logs (Appendix A). A geologic cross section is presented as Figure 3. f Groundwater was first encountered at depths ranging from approximately 11-1/2 to 13 feet below surface during drilling, and stabilized at depths varying from 951 to , 9.84 feel during the November 11;:1990, groundwater sampling event (Table 1). The _—.direction_of_graundwater_flow was calculated to be north northwesterly at a gradient of approximately 0.006 . A groundwater contour map is presented as Figure 4. 3100101/REPORT 4 February 13,1991 ?