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Stantec ""eve No Further Action Request Report Chevron and ARCO Commingled Plume No. CP0034 April 10, 2012 located approximately one mile south of the site is used for lawn irrigation (EMCON, 1986). EMCON's historical well survey data is included as Appendix F. In October 2011, Stantec received confirmation from the City of Stockton that municipal well #10, located on the northeast corner of Benjamin Hold Drive and Plymouth Road, was destroyed in July 2012. The city additionally confirmed that there are no plans to replace that well. Stantec conducted an updated well search survey in February 2012. Stantec reviewed well completion reports provided by the California Department of Water Resources (DWR). Well completion reports indicate that two municipal wells are located within a half mile of the site. According to the well completion reports provided by DWR, no domestic or irrigation wells are located within a half mile of the site. The municipal wells are located approximately 2,300 ft east (cross-gradient) and 2,600 ft northeast (down-gradient) of the site. These wells were previously identified by EMCOM in the 1986 well search. The approximate locations of the wells are shown on Figure 26. Table 7 provides details associated with all the wells identified. A survey of nearby areas located three sensitive receptors within 2,000 ft of the site. Creative Child Care Inc. is located approximately 800 ft southwest (up-gradient) across Interstate 5, and Knolls Elementary School is located approximately 1,600 ft southeast (cross-gradient) of the site. Additionally, Fourteen Mile Slough is located approximately 2,000 ft south of the site. /3.1.2. Risks to Public Health and the Environment The risk to public health and safety and ecological receptors has been reduced to comparatively insignificant levels. The Site is currently an active gasoline dispensing facility. The primary source of exposure appears to be gasoline and gasoline vapors at the active gasoline dispensing pump islands. Potential secondary sources for exposure appear to include residual hydrocarbons in subsurface soils, dissolved hydrocarbons in the groundwater, and volatilization of hydrocarbon compounds. Exposure to petroleum hydrocarbon contamination via direct contact/ingestion of soil and direct contact with groundwater is not likely since the Site is capped with asphalt and concrete. Exposure to petroleum hydrocarbon contamination via ingestion of groundwater is not likely since the dissolved petroleum hydrocarbon plume beneath the site is confined to site boundaries, is stable, and decreasing in concentration. The nearest municipal well is located approximately a half-mile from the site, and given the depths that the municipal wells are v 94275 NFAR 2012.doc 13