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' 1. INTRODUCTION <br />' At the request of ExxonMobil Oil Corporation (ExxonMobil), ETIC Engineering, Inc (ETIC) <br /> has prepared this Work Plan for Chemical Oxidation Pilot Study for former Exxon Retail Site <br /> (RS) 7-3942, located at 4444 North Pershing Avenue, Stockton, California (Figure 1) This work <br />' plan was prepared in response to a letter from the San Joaquin County Environmental Health <br /> Department (SJCEHD) to ExxonMobil dated 3 September 2003 (Appendix A), in which the <br /> SJCEHD recommended conducting a pilot study to evaluate low flow rate ozone spargmg <br /> In a work plan dated December 2004 ETIC proposed a laboratory oxidant injection benchscale <br />' study, and, pending results of the laboratory benchscale study as well as regulatory approval, an <br /> oxidant injection field pilot test Both the benchscale study and field pilot test are needed to <br /> gather additional information needed to assess the feasibility of injecting ozone and hydrogen <br />' peroxide as an in situ technology for site remediation The oxidant injection benchscale study <br /> was conducted by PRIMA Environmental (PRIMA) and included an assessment of the ozone <br /> demand of soil, the effect of ozone/hydrogen peroxide sparging on the concentrations of <br /> constituents of concern, and the fate of any metals present in the soil as it relates to degrading <br /> water quality The benchscale study indicated that oxidant injection may be an appropriate <br /> remedial technology that will not degrade water quality at the site <br />' A Report of Findings Evaluation of Peroxone for the In Situ Chemical Oxidation of Petroleum <br /> Hydrocarbons (PRIMA 2005), which presented the results of the benchscale study, was <br /> submitted in June 2005 along with a letter prepared by ETIC that summarized these results and <br /> proposed that a limited field pilot study be conducted at the subject site This Work Plan for <br /> Chemical Oxidation Pilot Study presents an overview of the technology, the scope of work for <br /> this proposed pilot test for the injection of hydrogen peroxide and ozone, and sampling and <br /> analysis plans to assess impact to groundwater quality <br /> 1.1 SITE DESCRIPTION AND LAND USE <br /> Former Exxon RS 7-3942 is currently a vacant lot located on the southeast corner 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 (USTs), which were removed <br /> from the site in July 1986 <br /> Land use in the vicinity of the site is primarily commercial and residential A Shell-branded <br /> service station and a 7-Eleven gasoline and convenience store are located on the southwest and <br /> northwest corners, respectively, of the intersection of North Pershing Avenue and Rosemarie <br /> ` Lane The Chateau Hospital convalescent home is located approximately 200 feet northeast of <br /> the site across Rosemarie Lane There is an apartment complex to the east of the site and a <br /> commercial building to the south Stagg High School is located approximately 1,500 feet <br /> ' southwest of the site <br /> GTrojects1739425MASTERNWP1WP07051Ozonc Injcction Pilot Test Work Plan doc <br /> 1 <br />