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Limited Groundwater Investigation—Work Plan 3314 N.Delaware Ave Stockton,California Page 2 disposal characterization. All borings will be backfilled with neat cement grout pursuant to San Joaquin County Environmental Health Department(EHD)guidelines. 4.0 FIELD PROCEDURES 4.1 SITE PREPARATION Condor will obtain the necessary drilling permits from EHD prior to scheduling field activities with the sub-contractors and notifying Underground Services Alert(USA). The proposed boring locations will be marked with white paint and USA will be notified at least 48 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area. In addition, a private utility locator will be contracted to scan and identify potential subsurface piping and other anomalies, such as any remaining USTs. Prior to initiating fieldwork at the Site, all field personnel will familiarize themselves with the Site- Specific Health and Safety Plan (HASP) and a tailgate safety meeting will be held prior to commencement of fieldwork on location. The HASP pertains to field activities and includes information on potential hazards expected to be encountered at the Site,personal protective equipment, and directions to and telephone numbers for the nearest hospital. A copy of the HASP is included in Appendix B. 4.2 GROUNDWATER SAMPLING METHODOLOGY Condor proposes drilling and collecting groundwater samples from three (3) locations in and on around areas where potential contamination exists. Borings will be advanced using a Geoprobe direct push drilling company licensed by the State of California (C-57 license). Groundwater samples will obtained by advancing the direct push boring until groundwater is encountered in the subsurface. A temporary well will be set using PVC piping with a 5-foot screen set within the water column. A 1/8-inch tubing with a check value tip will be inserted into PVC pipe or tubing with peristaltic pump to obtain grab groundwater samples. Each groundwater sample retained for laboratory analyses will be labeled, placed in chilled coolers, and transported under chain-of-custody procedures to California State Certified Laboratory. 5.0 LABORATORY ANALYSES Groundwater samples will be analyzed for volatile organic compounds (VOCs), including PCE. Laboratory detection limits will be sufficient for comparison to regulatory thresholds. A 10-day laboratory turnaround time will be requested. 6.0 REPORTING Condor will evaluate the laboratory analytical results, qualify the data, and compare results to regulatory screening thresholds. Condor will prepare a report detailing the investigation including: detailed geologic logs, laboratory analytical results, and conclusions/recommendations. The deliverables will include one electronic copy of the report and up to three hard copies, if requested. Additional hard copies can be included for additional fees if requested. k44n� �1 CONDOR