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California Department of Transportation Revised September 23, 1994 Project No 102818A-01 Quality Assurance Laboratory on June 6, 1994 for chemical analysis Ninyo & Moore attempted to locate a qualified analytical laboratory in the Stockton area, however, due to associated increased costs in analysis and Caltrans contract limitations on Minority Business Enterprise (MBE) participation, Ninyo & Moore used Quality Assurance Laboratories as specified in the Caltrans contract agreement The purge water stored in 55-gallon drums was collected by Ramos Environmental on August 15, 1994 and transported under non-hazardous manifest No 93465317 to the Ramos Environmental Services facility located in West Sacramento, California for disposal A copy ' of the manifest for the purge water transfer is presented in Appendix B ' ANALYTICAL TESTING Groundwater samples collected were analyzed for total petroleum hydrocarbons (TPH) as gasoline by EPA test method 8015-modified Department of Health Services (DHS), TPH as diesel by EPA test method 8015 modified DHS, and benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA test method 8020 ANALYTICAL RESUL'T'S Elevated concentrations of TPH as gasoline were detected in groundwater samples collected ' from monitoring wells MW-A, MW-B, and MW-C TPH as gasoline was detected at concentrations of 1,500 micrograms per liter (µg/f) in MW-A, 588 µg/t in MW-B, and 1,200 ' Agit in MW-C TPH as diesel was not detected in concentrations greater than the detection limit in groundwater samples collected Elevated concentrations of BTEX were detected in ' groundwater samples collected from all three moratonng wells Concentrations of benzene ranged from 238 ug/I to 13,700 µg/f, concentrations of toluene ranged from 151 µg/e to 418 ' µg/C, concentrations of ethylbenzene ranged from less than the detection limit to 14 5 µg/e, and concentrations of xylenes ranged from 45 7µg/f to 295 µg/f A summary of the results ' of the groundwater analysis is presented in Table 2 The laboratory analytical report, including quality control/quality assurance data and chain of custody documentation, is ' presented as Appendix C. 3 1