ARCHIVED REPORTS_XR0008815 - Laserfiche WebLink

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The groundwater was sampled with a Teflon' point source bailer The samples were placed into the appropriate sample container with preservatives added and labeled The samples were stored ' in an cooler with ice and shipped to the BSK State-certified Analytical Laboratories in Fresno for chemical testing The chemical analyses performed on the samples included Total Petroleum Hydrocarbons as ' Diesel (TPH-D) by Method DHS GC/FID and Benzene, Toluene, Xylene, Ethylbenzene (BTXE) by EPA Method 5030 and 602M 1 7.0 ANALYTICAL RESULTS ' The results of the analysis of the groundwater samples are presented in Table 2 The laboratory data sheets and chain-of-custody documents are presented in Appendix A ' TABLE 2 ANALYTICAL RESULTS GROUNDWATER SAMPLES ' (Results in micrograms per liter ug/L) Sample TPH- Benzene Toluene Ethyl Total ' I D Diesel Benzene Xylenes MW-4 ND ND ND ND ND MW-5 ND ND ND ND ND MW-6 ND ND ND ND ND ' Detection 50 0 3 0 3 0 3 0 3 Limit ' N D = None Detected ' 8.0 FINDINGS 8 1 Subsurface Conditions ' The subsoils as encountered during the drilling of MW-5 and MW-6 generally consist of very stiff to hard silt with sand and silty clay to a depth of approximately 45 to 50 feet At a depth ' of 50 feet, a zone of very dense sand was encountered Below the sand zone, hard silt with sand and silty clay was encountered to depths of approximately 75 to 80 feet At a depth of 80 feet in well MW-5, silty sand was encountered to the total depth of 90 feet At a depth of 75 to 80 ' feet in well MW-6, sand was encountered to an approximate depth of 87 feet, where silty clay was encountered Refer to Figures 4 through 9 for additional description of subsurface conditions I 4 rAssociates