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' T ABLE 1 <br /> FF . UNDERGROUND STORAGE TANKS <br /> ' Hess-Dubois Cleaners <br /> 348 West Harding Way, Stockton, California <br /> Tank Identification Volume (Gallons) Product <br /> Tank #1 2000 Stoddard Solvent <br /> Tank #2 1800 Stoddard Solvent <br /> Tank #3 2000 Stoddard Solvent <br /> Tank #4 500 Stoddard Solvent <br /> Tank #5 1370 Stoddard Solvent <br /> ' Stoddard Solvent <br /> Tank #6 5000 <br /> Tank #7 500 Stoddard Solvent <br /> Tank #8 500 Stoddard Solvent <br /> 23 Monitoring Well Installation and Sampling <br /> Three groundwater monitoringwells were installed at the site on October 26, 1993. The <br /> wells were installed under the supervision of John P. Cummings &Associates (JPA). A total <br /> of 23 soil samples were analyzed by Sparger Technology, Inc. (STI) for TPH as stoddard <br /> solvent and BTE&X. <br /> No TPH or BTE&X were detected in samples from MW-1 or MW-2. However, TPH was <br /> detected in samples from MW-3 of concentrations up to 2,000 ppm (MW-3 16'); toluene, <br /> ethylbenzene and xylenes were detected in samples from MW-3 at concentrations up.to 51 <br /> ' ppm (xylenes, MW-3 16). The analytical results of the soil samples are summarized in Table <br /> 2. <br /> ' Groundwater samples were collected from each well on November 4, 1993 by representatives <br /> of JPA. The samples were analyzed for TPH as Stoddard solvent and BTE&X by STI. TPH <br /> and BTE&X were detected in each well. The analytical results of groundwater samples are <br /> ' included in Table 4. <br /> ' 2.4 Monthly Monitoring <br /> In a letter dated December 31, 1993, the San Joaquin County Public Health Services - <br /> Environmental Health Division(PHS/EHD)recommended that"monthly measurements and <br /> ' gradient calculations be initiated for the site to verify the groundwater direction." Monthly <br /> o.ab„ai A."U-in Im- 4 <br /> Sewaro Sana QR3N-946645 <br /> 1 <br />