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INTRODUCTION <br /> r <br /> At the request of ExxonMobil Refining and Supply Company (ExxonMobil) (formerly Exxon <br /> Company,U.S.A.), ETIC Engineering, Inc. (ETIC)has prepared this work plan to summarize the <br /> environmental status and planned environmental work at former Exxon Retail Site (RS) 7-3942, <br /> located at 4444 North Pershing Avenue in Stockton, California. <br /> ` This work plan proposes the installation of eight soil borings for the collection of soil and soil <br /> gas samples to be used in a risk assessment. The analytical results for the soil and soil gas <br /> samples will be used in a risk analysis following the ASTM Risk Based Corrective Action <br /> ` (RBCA) methodology. The risk analysis will be performed to evaluate potential risks to <br /> residents of apartments northeast of the site, and to assess potential risks to commercial workers <br /> following the development of the property. <br /> r <br /> Other planned and ongoing environmental work for the site includes the following: <br /> r <br /> • Evaluation of site conditions. <br /> • Application for low-risk soil and groundwater closure as a result of the risk assessment. <br /> • Continued groundwater monitoring and reporting on a quarterly basis. <br /> SITE BACKGROUND <br /> r Former Exxon RS 7-3942 is currently a vacant lot located on the southeast comer of the <br /> intersection of North Pershing Avenue and Rosemarie Lane (Figure 1). Used oil and three <br /> grades of gasoline were stored in four underground storage tanks, which were removed in <br /> July 1986. <br /> Land use in the vicinity of the site is primarily commercial and residential. A Shell service <br /> station and a 7-11 food and gasoline service store are located on the southwest and northwest <br /> corners, respectively, of the intersection of North Pershing Avenue and Rosemarie Lane. <br /> PREVIOUS ENVIRONMENTAL ACTIVITIES AT THE SITE <br /> From January 1987 to April 1988, 10 groundwater monitoring wells (MWl—MW10) were <br /> ` installed on and off the site; monitoring wells MW1—MW7 were installed on the site and wells <br /> MW8—MW10 were installed off the site. Groundwater recovery wells RW1—RW3 were installed <br /> on the site in May 1990. From January through April 1991, wells IW1, P1, P2, RW4, Vl—V4, <br /> MWl 1, and MW 12 were installed on and off the site. <br /> Liquid-phase hydrocarbons (LPH) have been found in wells MW3, MW6, RW3, V 1, V2, and <br /> ` V4, as documented in quarterly groundwater monitoring reports. In December 1992, passive <br /> skimmers were installed in wells RW3 and V1 to recover LPH. During past quarterly <br /> groundwater sampling events, petroleum hydrocarbons have been detected in groundwater <br /> ` samples collected from all wells except MWll, which is the most downgradient well and is <br /> located off the site. <br /> r <br /> F\PmjttbVl942WASTER\WP\"IMNtc.t. c 1 <br /> r <br />