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i <br /> f <br /> benzene, 2.3 ppb toluene, 2.5 ppb ethyl benzene, and 4.8 ppb total <br /> xylenes. No oxygenates were detected in this groundwater sample. No <br /> other permeable layers were identified below 37-feet to the total depth <br /> { explored of 70-feet bgs. Based on this information, ASE does n o t r <br /> anticipate any significant vertical impact below 20-feet bgs, and does n o t <br /># recommend any further vertical investigation unless drinking water wells <br /> 1 are identified in the site vicinity with deeper screens that could b e <br /> impacted. <br /> 13 . 0 RECOMMENDATIONS F <br /> f <br /> r <br /> ASE recommends the following: <br /> Monitor the site wells on a quarterly schedule. The next sampling will b e <br /> r in January 2001. <br /> Perform an area well and sensitive receptors survey to locate wells and <br /> water bodies within a 2,000-foot radius of the site. <br /> ASE believes that the extent of hydrocarbons to the west and northeast is <br /> not defined. ASE anticipates that San Joaquin County PHS-EHD will require <br /> further assessment to define the horizontal extent of contamination. It <br /> should be noted that monitoring wells already exist to the west and <br /> northeast for other properties, but it is unlikely that ASE will be granted <br /> access to the wells. <br /> ASE also recommends that further vertical definition of contamination <br /> be <br /> conducted if any nearby wells, screened in deeper zones, are located <br /> which could be impacted from site contamination. <br /> k <br /> 14 . 0 REPORT LIMITATIONS <br /> The results of this assessment represent conditions at the time of the soil <br /> and groundwater sampling, at the specific locations where the samples <br /> were collected, and for the specific parameters analyzed by t h e <br /> laboratory. <br /> It does not fully characterize the site for contamination resulting from <br /> unknown sources, or for parameters not analyzed by the laboratory. All <br /> of the laboratory work cited in this report was prepared under the <br /> direction of an independent CALrEPA certified laboratory. The <br /> independent laboratory is solely responsible for the contents and <br /> conclusions of the chemical analysis data. <br /> f <br /> P <br /> 574 West Grant Line Road Report — October 2000 <br /> - i t- <br />