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i Corrective Action Work Plan Chevron Service Station 9-4275 Stockton, California This corrective action work plan("Work Plan")details the steps that Chevron U.S.A. Inc. ("Chevron")proposes to evaluate and correct the items identified by the San Joaquin County Environmental Health Department("EHD")at the March 18,2009 meeting between Chevron and EHD. Chevron's objective in submitting the Work Plan is to establish the proper and consistent functioning,in compliance with all laws and regulations,of the primary and secondary containment systems at the service station located at 2905 W. Benjamin Holt Dr in Stockton,California. Chevron proposes—and requests EHD's comments and endorsement of-the following procedures to identify and repair leaks,and potential system upgrades. I. Leak Identification A. Inspection and Documentation (see Table 1) The interior of all sumps and their visible components will be inspected and the following items will be documented for each sump: • Identify all the systems components: Sump manufacturer,pipe manufacturer,penetration fitting types and current condition. • Identify if there is a bottom drain on the sump. • Identify if the penetration fittings are filled. • Identify if the sump is Gel Coated. (Gel Coating increases the difficulty to identify the location of potential sump wall deficiencies.) • Identify if there is brine in the sump bottom. (The presence of brine on the sump bottom indicates a brine system release.) • Identify if the reservoirs have a brine level demarcation line. If not,one is to be installed. • Identify if the brine level below the demarcation line. If so,document the number of inches it is low to the 1/4 inch. • If the brine level was restored to the demarcation line, document the restoration volume to the nearest ounce. • Determine if any components are showing evidence of causing a brine release. i.e. entry boot clamps, entry boots,brine reservoirs,tubing,tubing fittings, sump test ports, sump walls. If, so list the components. ■ Document any component(s)repaired at the time of inspection and the repair method. • Document if the repair(s)proved to be effective and list the verification method(s). 1