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GeologicaC 7-ech4 cs Inc. 1 101 Th Street Modesto,Califomia 95354 (209)522-4119/Fax(209)522-4227 t Work Plan for In-Situ Remediation Pilot Test ' J.M. Equipment Company ' 1245 West Charter Way Stockton, California ' Project No 507 3 June 10, 2003 1.0 INTRODUCTION A gasoline release from former underground storage tanks has been documented at the J M Equipment Company at 1245 West Charter Way, Stockton, CA (see Figures 1 & 2) Geological Technics Inc (GTI) has completed site investigation work that included the installation of soil borings and groundwater monitoring wells The data gleaned from these efforts indicates that a significant gasoline plume is present in groundwater at the site ' GTI submitted our September 20, 2002 "In-Situ Remediation" Feasibility Study to the San Joaquin County Public Health Department/Environmental Health Division (SJC PHS/EHD) for approval GTI proposed the preparation of a work plan for a small scale in-situ oxidation pilot test The pilot test would include injecting hydrogen peroxide and ozone ' into the subsurface utilizing two to three small diameter injection wells located within five to ten feet of an existing monitoring well The peroxide and ozone would combine to form the hydroxyl radical, which would then break down the BETX and TPH in the groundwater tand capillary zone at the site On September 30, 2002, SJC PHS/EHD staff called GTI regarding the feasibility study plan ' They requested that we provide case history data to show that in-situ injection of hydrogen peroxide has worked on other similar sites Our January 15, 2003 "Addendum — In-Situ Remediation Feasibility Study" included the requested information and the SJC PHS/EHD ' approved the study in their March 20, 2003 letter correspondence The following work plan has been developed to complete an in-situ oxidation pilot test to remediate the residual contaminants at the site