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r *ft/ 1"0 1. INTRODUCTION At the request of ExxonMobil Oil Corporation (ExxonMobil), ETIC Engineering, Inc. (ETIC) has prepared this Work Plan for the Installation of Injection Point Pairs and Exploratory Boring for former Exxon Retail Site (RS) 7-3942, located at 4444 North Pershing Avenue, Stockton, California (Figure 1). Data collected during this investigation will be used to assess the vertical extent of hydrocarbon-impacted soil and groundwater. In addition, soil samples will be analyzed for a general mineral suite as part of a bench scale study which may be performed to evaluate the effects of injecting ozone and hydrogen peroxide into the subsurface. The proposed injection point pairs will be used to perform air sparging tests, which will provide additional information needed to assess if insitu chemical oxidation using a combination of ozone and hydrogen peroxide is a viable option as a remedial technology. Former Exxon RS 7-3942 is currently a vacant lot located on the southeast comer of the r intersection of North Pershing Avenue and Rosemarie Lane (Figure 1). Used oil and three grades of gasoline were stored in four underground storage tanks, which were removed from the site in July 1986. Land use in the vicinity of the site is primarily commercial and residential. A Shell service station and a 7-Eleven food and gasoline service store are located on the southwest and r northwest corners, respectively, of the intersection of North Pershing Avenue and Rosemarie Lane. The Chateau Hospital convalescent home is located approximately 200 feet northeast of the site across Rosemarie Lane. There is an apartment complex to the east of the site and a r commercial building to the south. Stagg High School is located approximately 1,500 feet southwest of the site. 2. PROPOSED SCOPE OF WORK ETIC proposes the installation of three injection point pairs (IP1-IP3) and the installation of one exploratory boring(EB 1). ETIC proposes to conduct the following activities: • Prior to field work, a permit for the installation of three injection point pairs, which will be used during subsequent air sparging tests, and one exploratory boring will be acquired from the San Joaquin County Environmental Health Department (SJCEHD). • ETIC personnel will mark the three proposed injection point pair locations and one exploratory boring location as indicated on Figure 1, and Underground Service Alert (USA) will be contacted at least 72 hours prior to drilling. The locations may be moved slightly based on surface and subsurface conditions (surrounding features, subsurface r obstructions, etc.). A licensed utility line locator will be subcontracted by ETIC to clear the marked drilling locations. If a marked location is over or adjacent to a utility line, ` ETIC personnel will mark another location, which will be screened by the utility line locator to clear the location for drilling. G:\Pmj"\)3942 A SM\K WP0901\WTex dm I