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• Identified Contamination Source Evaluation <br /> 17. The Galli pad area, adjacent to the It is unclear whether the mercury- <br /> north and west of the Site, is listed contaminated soil was ever <br /> as a closed cleanup site by removed from this facility. If not, the i <br /> GeoTracker. Mercury was found to potential exits for the soil to blow or <br /> be present in the soil, including free wash onto the subject Site. <br /> elemental mercury at one location; <br /> however, the mercury was not <br /> found to extend more than 0.5 feet <br /> below the ground surface. Mercury <br /> was only detected in one <br /> groundwater sample; the level <br /> detected was below the MCL. In a <br /> 1996 letter, Unocal indicated its <br /> intention to remove the mercury- <br /> contaminated soil. The case was <br /> closed by the California Regional <br /> Water Quality Control Board <br /> (Regional Board) in 2012. The <br /> closure letter implies that the <br /> Regional Board has no evidence <br /> • that the soil removal ever took <br /> place; however, based on the <br /> limited extent of contamination, <br /> Regional Board "staff do not <br /> consider the Site a cleanup site." <br /> (Current or past off-site) <br /> 18. Six gas wells were identified within The Department of Oil, Gas, and <br /> one-quarter mile of the subject Site. Geothermal Resources provides <br /> Many of these are also listed as regulatory oversight for gas wells. <br /> hazardous materials handlers and The San Joaquin County <br /> fuel tank facilities. (Current off-site) Environmental Health Department <br /> provides regulatory oversight for <br /> hazardous materials and fuel tanks. <br /> 19. A natural gas transmission pipeline The Office of Pipeline Safety, within <br /> was identified running from the gas the U.S. Department of <br /> wells north of the Site along Transportation, Pipeline and <br /> Howard Road to the west. The Hazardous Materials Safety <br /> pipeline is operated by California Administration, has regulatory <br /> Resources Central Valley. responsibility for gas pipelines under <br /> its jurisdiction. <br /> • <br /> LOGE 1522 16 <br />