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Because the Victor Formation is limited in thickness, most wells draw their water from the <br /> ' underlying Laguna Formation Regional depth to first groundwater is estimated to be <br /> approximately 45 feet below grade based on San Joaquin County's Flood Control and Water <br /> ' Conservation District, Spring 1991 data Regional groundwater flow is to the northeast toward <br /> a groundwater depression located east of Stockton <br /> An Environmental Record SearchERS <br /> ( ) was preformed on April Ib, 1992 to investigate <br /> environmental concerns within one mile of the site The ERS included Federal, California State, <br /> and Regional regulatory databases which listed environmental concerns and operating permits <br /> ' required for the handling, moving, storage, and disposing of hazardous materials The ERS <br /> identified numerous environmental concerns and operating permits within one mile and a one- <br /> half mile of the site (Figure 3) suggesting that shallow groundwater in the region is generally <br /> of poor quality The ERS is included in Appendix III <br /> 2.7 Proximity of Private, Municipal and Irrigation Wells: <br /> Well location data within a one-half mile radius of the site was reviewed at the Department of <br /> Water Resources, San Joaquin District (DWR) Well location survey information is summarized <br /> ' on Table 2 Listed in the DWR records are seven domestic wells, four monitoring wells and <br /> two wells of unknown use The listed wells nearest the subject site are the four monitoring <br /> ' wells which are located approximately 1300 feet to the north <br /> ' 3.0 FIELD INVESTIGATION <br /> 3.1 Phase I Activities <br /> ' On March 25, and 26, 1992, RESNA personnel advanced three soil borings (MW1, MW2, and <br /> MW3) to depths ranging from 50 to 60 feet below grade at the protect site to accomplish the <br /> following 1) attempt to define the lateral and vertical extent of petroleum hydrocarbon soil <br /> ' contamination, 2) determine soil stratigraphy, and 3) install groundwater monitoring wells within <br /> the uppermost aquifer in order to assess groundwater quality The boring/well locations are <br /> plotted on Figure 2 <br />' IPAR0492 TIL 3 <br />