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underlie the area and unknown well construction details for some of the <br /> wells, it is not possible to conclude that no dissolved gasoline <br /> constituents could migrate into adjacent water supply wells. <br /> Four of the nine wells in the site vicinity are used for drinking <br /> water. The nearest well is a City of Stockton municipal water supply <br /> well (20M2) located approximately 530 feet north of the site, near the ; <br /> "W northeast corner of Benjamin Holt Drive and Plymouth Road. This well is <br /> drawing from an aquifer 295 to 353 feet below the ground and has a <br /> sanitary surface seal to 55 feet below the surface in a clay interval <br /> that continues to a depth of 72 feet. The clay serves as additional <br /> protection from contamination in the shallow ground water under the <br /> site. Another City of Stockton municipal well (20F1) is located in <br /> Swenson Park Golf Course, about i/2-mile northeast of the site. This <br /> well is drawing from aquifers at 85 to 403 feet below the ground <br /> level. information on the sanitary seal of this well was unavailable. <br /> A San Joaquin County Flood Control well. (201.1) is located 1/2-mile east <br /> of the site on Belmont Place, This well is drawing water from an <br /> aquifer 272 to 328 feet below the ground and has a sanitary seal to <br /> � . <br /> 35. feet below the surface. The fourth drinking water well (20J1), also <br /> run by the San Joaquin County Flood Control District, is located approx- <br /> imately 1-mile west from the site. No drilling information was <br /> available on this well. <br /> Both Flood Control wells (20L1 and 20J1) have been sampled between <br /> November 28, 1984 and January 16, 1985 and analyzed for dissolved hydro <br /> a✓ carbons according to EPA Methods 601 and 602. No evidence of hydro- <br /> carbon constituents (benzene, toluene, or xylene) was detected. It is <br /> w. EMCON's understanding that the two C`.ty of Stockton wells (20M2 and <br /> 20F1) have never been analyzed for dissolved gasoline constituents. - <br /> However, general ground-water quality parameters were available for <br /> these wells. (All available sampling reports are included in <br /> Appendix B.) <br /> 'JD 438-22.04 4 ' <br /> tes <br /> Ef11COfl Rssocio <br />