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benzene, 2 3 b toluene, 2 5 ppb ethyl benzene, and 4 8 b total <br /> • PP Pp <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 <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 /> are identified in the site vicinity with deeper screens that could b e <br /> impacted <br /> 13 . 0 RECOMMENDATIONS <br /> ASE recommends the following <br /> Monitor the site wells on a quarterly schedule The next sampling will b e <br /> in January 2001 <br /> Perform an area well and sensitive receptors survey to locate wells a n d <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 be <br /> conducted if any nearby wells, screened in deeper zones, are located <br /> which could be impacted from site contamination <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 the <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 CAL-EPA certified laboratory The <br /> independent laboratory is solely responsible for the contents and <br /> conclusions of the chemical analysis data <br /> 574 West Grant Line Road Report — October 2000 <br /> - lt - <br />