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M Remedial Action Plan Canepa's Car wash, 6230 Pacific Avenue, Stockton, California N _ Much 35 2003 Page 5 1 expected to provide an effective capture radius of 140 feet, sufficient to capture the entire identified plume. However, pumping will be kept close to 10 gpm to maximize drawdown, and consequently the effectiveness of the vapor extraction system. it Monitoring of the system will include sampling the air stripper water influent and effluent, the thermal oxidizer influent (both air stripper and vapor extraction streams separately), and the thermal oxidizer effluent. Air stripper water influent and effluent sampling will be conducted by sampling for laboratory a analysis on a frequency as required by the discharge permit. Air sampling will include laboratory analysis quarterly and PID analysis weekly. t 3.4 SCHEDULE Following approval of this RAP, applications will be submitted for revision of the air discharge permit and for the sanitary sewer discharge permit. Application will also be made to the UST Cleanup Fund for pre-approval . Upon fund approval and permit acquisition, application will be made for any necessary building department permits and the equipment will be ordered . It is anticipated that the equipment will have a delivery date approximately four weeks after ordering, 4.0 COMMUNITY HEALTH AND SAFETY PLAN No health and safety issues are expected from operation of this system. Treated water discharge will meet standards for discharge to the sanitary sewer, and the thermal oxidizer will meet the air permit - requirements. The noise level is expected to be less than the current treatment system, and the vapor extraction blower incorporates the latest noise reduction technology (liquid ring). Additionally, there will be a chain- link fence around the entire treatment pad and noise-reduction slats will be installed. 5.0 AGENCY INTERACTIONS The lead agency is the San Joaquin County Environmental Health Department (EHD). The EHD will r review this RAP. RAP approval by the EHD will be necessary for UST Cleanup Fund pre-approval. The ' revised air permit will be issued by the San Joaquin Valley Air Pollution Control District, The sanitary sewer discharge permit will be issued by the City of Stockton Municipal Utilities Department. Any necessary building permits will be issued by the City of Stockton Permit Center. The site is in the jurisdiction of the Central Valley Regional Water Quality Control Board. 6.0 VERIFICATION SAMPLING I{ The clean-up levels for benzene and MTBE in groundwater were proposed in the Corrective Action Plan at 73 .9 micrograms per liter (pg/I) and 13 ltg/l, respectively. Attainment of the clean-up levels for pis groundwater will be determined by the highest concentration of benzene and MTBE in extracted s{ groundwater (if a pump and treat system is installed) or in any of the monitoring wells. Once the clean-up levels are achieved, the remediation system will be monitored for four quarters to verify that the clean-up goals have been achieved. Site closure is warranted when it can be demonstrated that water quality goals have been achieved. 7.0 SUMMARY AND CONCLUSIONS Y The site contains significant subsurface contamination from hydrocarbon fuels that could create health hazards from toxic vapors in the on-site structure, or by migration off site. The most cost-effective remediation strategy involves groundwater pumping for treatment, and vapor extraction. Following approval of this RAP, all agency notifications will be made and permits will be obtained. Upon successful � i«1 CO 1