SITE INFORMATION AND CORRESPONDENCE_FILE 2

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r A Complaint No. 11917 - 4 - 8 November 2013 Valero/Jamar Service Station Stockton, San Joaquin County their laboratory equipment. Bromodichlorormethane, and chloroform did not exceed their drinking water levels (MCLs) and are considered by-products of the chlorination process of drinking water. . The constituents found in MW-12A are the "lighter" and most mobile components of gasoline. These were not found in your water samples. The heavier components found in your water are relatively immobile in the soil and groundwater. They are not found in MW-12A. Motor oil is not found in the Jamar plume, nor do the data show that a substantial amount of motor oil was released to the soil when the waste oil UST was removed. Your water is provided by California Water Service from supply wells that are not within the path of the Jamar Service groundwater plume. There is no other pathway for the Jamar Service groundwater plume to get into your public water supply. For concerns about the water supply, please contact California Water Service, the San Joaquin County Environmental Health Department at (209) 468-3420, or the California Department of Public Health (CDPH) at (209) 948-7696. 2. Soot coming out of the remediation system exhaust We were unable to verify soot coming out of the treatment system exhaust at the Jamar Service Station. On the day we conducted our site inspection (21 August 2013) the system was operating properly and no smoke was observed coming from the exhaust stack. The Jamar Service Station is utilizing a soil vapor extraction system to clean up the petroleum released to the subsurface. The system operates by pulling a vacuum on wells constructed through the soil column and drawing volatile compounds into a catalytic converter to destroy the compounds before the air is released to the atmosphere. The trailer at the Jamar Service Station has a 20' tall chimney and houses the soil vapor extraction system (SVE). The emissions from the SVE system are regulated by the San Joaquin Valley Air Pollution Control District in the air quality permit. According to reports submitted by the consultants for the Jamar site the SVE system is operating in compliance with the air discharge permit. In addition to vapor extraction the Site is also operating an ozone injection system. The ozone generator is used to inject ozone gas into the groundwater from 71.5' to 105.2' below the ground surface to destroy petroleum hydrocarbons. During our site inspection, you stated that previously you had observed smoke coming out of the SVE chimney. I explained that if there was smoke coming out of the chimney, there is a phone number to call on the sign on the fence around the SVE system, that the consultant would send a technician to repair the malfunctioning SVE system. You may also contact the lead regulatory agency, SJCEHD if you observe soot or smoke coming from the SVE chimney. 3. No notification of pollutant release or operation of cleanup system at neighboring gas station. Cleanup and investigation at the Jamar Service Station is being conducted under the oversight of the San Joaquin County Environmental Health Department (SJCEHD). SJCEHD implements the Underground Storage Tank (UST) Program under contract from the State Water Resources Control Board. SJCEHD did not notify adjacent property owners prior to conducting the interim remediation for the petroleum release because public participation was not required in its contract with the State Water Resources Control Board. SCJEHD stated that prior to conducting all types of remediation, contacting adjacent property owners, tenants and interested parties was added to the 2013-14 contract with the State. You have been added as an interested party to correspondence regarding the Jamar Service USTs case.