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' Califorrua Department of Transportation July 7, 1934 <br /> Project No 102818A-01 <br /> ANALYTICAL TESTING <br /> Groundwater samples collected were analyzed for total petroleum hydrocarbons (TPH) as <br /> gasoline by EPPte <br /> od 8015-modified Department of Health Services (DHS), TPH as <br /> diesel by EPA t 15d DHS, and benzene, toluene, ethylbenzene, and <br /> xylenes (BTEXPA test 8 0 <br /> ANALYTICAL RESULTS <br /> i <br /> Elevated concentrations of TPH as gasoline were detected in groundwater samples collected <br /> from monitoring wells MW-A, MW-B, and MW-C TPH as gasoline was detected at <br /> concentrations of 1,500 micrograms per liter (ogle) in MW-A, 588 ug/e in MW-B, and 1,200 <br /> µg/e in MW-C TPH as diesel was not detected in concentrations greater than the detection <br /> limit in groundwater samples collected Elevated concentrations of BTEX were detected in <br /> groundwater samples collected from all three monitoring wells Concentrations of benzene <br /> ranged from 238 µg/e to 13,700 µglf, concentrations of toluene ranged from 151 µg/e to 418 <br /> ug/f, concentrations of ethylbenzene ranged from less than the detection limit to 14 5µg/f, <br /> and concentrations of xylenes ranged from 45 7 Ag/e to 295 µg/e A summary of the results <br /> i <br /> of the groundwater analysis is presented in Table 2 The laboratory analytical report, <br /> including quality control/quality assurance data and chain of custody documentation, is <br /> ' presented as Appendix B <br /> i <br /> l CONCLUSIONS <br /> AND RECOMMENDATIONS <br /> Based upon the results of this study, the following conclusions and recommiendahons are <br /> offered <br /> - Groundwater is present at the site at an approximate depth of 65 feet bgs The <br /> ' <br /> groundwater flow direction is estimated to be toward the north at an approximate <br /> gradient of 00013 feet per foot <br /> The results of the g dwater sampling and analysis program indicate concentrations <br /> of TPH as gasolitral rom 588 to 1,500 Agle Elevated concentrations of BTEX <br /> were also detecte r amples collected TPH as diesel was not detected <br /> in the concentrations a`bodt� e limit in any of the groundwater samples <br /> collected <br />