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SyS <br /> i <br /> In the site area, groundwater is shown on county flood <br /> control maps to exist at a depth of about 70 to 60 feet, which <br /> is an elevation of about 45 to 55 feet below sea level. Local <br /> pumping of the shallow water bearing zones is believed to be <br /> responsible for this deeper - below sea level - groundwater <br /> condition. <br /> several water wells exist in the site area as shown on <br /> Plate 3. Names and addresses of the well owners are not <br /> available at thinâ–ş time. The construction details of each well <br /> are similarly not available. Based on our brief observations of <br /> the size and structure of the pumping systems, the wells appear <br /> to be deriving water fron relatively shallow depths. One well <br /> located 1/4 mile south of the site, however, was apparently <br /> pumping large quantities of water from presumably much deeper <br /> water bearing zones. <br /> Y. RZVIZW OF LWWRATORT UMLYSIB Or BOIL SAMPLES <br /> Two sets of chemical test data were available for the tank <br /> removal and soil excavation efforts. One was from the original, <br /> tank removal effort in 1989, and the other was for additional <br /> soil excavations in 1490. The 1989 tests were performed by <br /> California Water Labs of Modesto, California and the 1990 series <br /> by Geoanalytical Labs, also of Modesto. Both sets of samples <br /> were collected and transported by sEMCO of Modesto, California. <br /> sample locations and results for the 1989, original tank <br /> removal effort are difficult to Interpret. On Plate 4A, the <br /> approximate, and to some extent prwsumed position of the samples <br /> collected and tested are shown. These results generally show <br /> Total Petroleum Hydrocarbons as gas and diesel in the tank <br /> excavation, oil and diesel in the approximate area of the fuel <br /> islands, and diesel in the initial stockpiled soils. Plate 4A <br /> shows the test result rext to the location. Copies of available <br /> test results performed by California Water Labs are presented in <br /> Appendix A. <br /> A total of 19 soil samples were tested by GeoAnalytical <br /> Labs for Total Extractable Petroleum Hydrocarbons, Benzene- <br /> Toluene-Xylene-Ethylbenzene. The results of these tests are <br /> shown below: <br /> 0 4 <br />