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ca � 1tt <br /> PACIFIC r 'I Hi_ ,I_TN <br /> ENVIRONMENTAL <br /> GROUP INC <br /> 9t, OCT I I PH 1 : 41 <br /> October 4, 1994 <br /> Project 310-040 02 <br /> Mr Bob Boust <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> Re Groundwater Morutoring Well Installations, <br /> Former Unocal Service Station 2859 <br /> 1665 Pacific Avenue at Walnut Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This letter presents the results of the additional soil and groundwater investiga- <br /> tions conducted by Pacific Environmental Group, Inc (PACIFIC), for Union Oil <br /> Company of California (dba Unocal) at the site referenced above (Figure 1) The <br /> purposes of this investigation were to further assess the hydrogeologic conditions <br /> and to identify the extent of petroleum hydrocarbons in soil and groundwater south <br /> of the site <br /> The work was performed as described in a PACIFIC Work Plan, dated August 6, <br /> 1993, and included the installation of two groundwater monitoring wells South and <br /> southwest of the site Soil and groundwater samples were collected for chemical <br /> analysis and groundwater monitoring This letter includes discussions of site <br /> description and background, a description of the scope of work performed, the i <br /> findings of this investigation, and conclusions and recommendations <br /> BACKGROUND <br /> Previous Investigations <br /> The site is located in Stockton, California Land use in the vicinity of the site <br /> includes retail stores, an elementary school, and private residences The closest <br /> water-supply well was documented by Applied Geosystems (Applied) to be <br /> 800 feet northeast of the site (December 1990) <br /> 2025 Gateway Place, Suite 440, San lose, California 95110 (408) 441-7500 FAX (408)441-7539 <br />