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Identified Contamination Source Evaluation <br /> 4. A total of 19 listed hazardous The Site appears to be in a <br /> materials facilities were identified relatively high-risk area for a <br /> within one-quarter mile of the Site, residential property based on the <br /> including 5 leaking underground number of listed facilities nearby. <br /> storage tank cases and two active The most significant of the LUST <br /> gasoline stations. Three cases was at Jamar Service, <br /> monitoring wells related to the located approximately 230 feet <br /> Jamar Service case are located on south-southwest of the Site. A soil <br /> or adjacent to the northeast corner and ground water investigation was <br /> of the subject Site. (Current and conducted for this facility from 1999 <br /> past off-site) through 2020, including monitoring <br /> wells, soil vapor extraction wells, a <br /> ground-water extraction well, <br /> injection wells, and soil gas probes. <br /> Impacted soil was determined to <br /> extend north for 75 feet, and an <br /> impacted ground-water plume was <br /> identified extending east from the <br /> facility past Adelbert Avenue. In <br /> 2021, the California Environmental <br /> Protection Agency stated that "the <br /> results of the investigation have <br /> concluded that the remaining <br /> hydrocarbon impact to soil and <br /> groundwater does not appear to <br /> pose any significant threat to human <br /> health, the environment, or future <br /> site activities." The Central Valley <br /> Regional Water Quality Control <br /> Board ordered in a November 2022 <br /> letter that the three monitoring wells <br /> near the Site (in which no <br /> constituents of concern were <br /> detected) be destroyed by February <br /> 2023. Because of the extensive <br /> investigation conducted, it is likely <br /> that impacts from several other <br /> facilities in the area, if present, <br /> would have been detected as part of <br /> the Jamar investigation. No <br /> evidence was encountered to <br /> suggest that these facilities have <br /> impacted the subject Site. <br /> LOGE 2251 14 <br />