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CORRECTIVE ACTION PLAN <br /> ARCO Mini Mart <br /> 4511 Pacific Avenue <br /> Stockton, CA <br /> 1.0 INTRODUCTION <br /> Assessment of gasoline-contaminated soil and groundwater at the intersection of Pacific Avenue <br /> and Rose Marie Lane in Stockton, California'(Figure 1) has been ongoing since February, 1991, <br /> when a broken pipe coupling in an unleaded gasoline product line resulted in the unauthorized <br /> release of an unknown volume of gasoline The piping was repaired by Falcon Energy <br /> Associates of Stockton, California, and assessment of soil and groundwater contamination was <br /> performed by WaterWork of Escalon, California and Geological Audit Services, Inc of <br /> Stockton Based on the data gathered during this assessment, subsequent groundwater <br /> monitoring, and removal and replacement of the fuel tanks and product lines in April, 1994, San <br /> Joaquin County Public Health Services,Environmental Health Division (EHD) has requested <br /> that the site owner, Mr Arthur Wyatt, submit a Corrective Action Plan for remediation of this <br /> ' site Mr Wyatt retained Upgradient Environmental Consultants of Sacramento, California to <br /> prepare this Corrective Action Plan for the remediation of contaminated soil at the site This <br /> corrective action plan addresses hydrocarbon contamination in the soil only Due to low and <br /> generally declining hydrocarbon concentrations in groundwater, groundwater remediation is not <br /> proposed at this time <br /> 2.0 BACKGROUND <br /> 1 , <br /> 2.1 Product Line Release <br /> ' Discovery of a broken pipe coupling in the unleaded product line leading to the northernmost of <br /> three dispenser islands (Figure 2) was made on February 19, 1991, when gasoline began to seep <br /> through cracks in the concrete pad near the island Operation of the site was halted and efforts <br /> ' were made to locate the source of the leak and repair it On February 20, Falcon Energy <br /> excavated two shallow trenches in the dispenser area and located the broken coupling near <br /> sample point A(Figure 2) Soil samples A and B were collected by WaterWork and analyzed for <br /> total petroleum hydrocarbons in the gasoline range and volatile aromatic hydrocarbons <br /> (BTE&X) The coupling was replaced, the trenches were covered with temporary steel plates, <br /> ' and the site was returned to operation <br /> Laboratory analysispf the soil samples indicated that gasoline concentrations of 100 and 13,000 <br /> mg/kg and benzene concentrations of 1 and 140 mg/kg were present between S and 23 feet <br /> 1 <br />