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23 Samph During drilling all soil samples and drill cuttings were logged by a geologist using the Unified Soil Classification System In addition, all soil samples and drill cuttings were field screened for volatile organic compounds using a photoionization detector (PID) equipped Wath a 10 6 eV lamp calibrated to an isobutlyene standard These readings and any subjective evidence of petroleum hydrocarbons were recorded on the boring logs Soil samples were collected every 5 feet or at obvious changes in lithology using a split spoon sampler Soil samples were collected from the sampler in brass tubes and sealed with Teflon'tape and plastic end-caps The soil samples were labeled with the appropriate borehole location, time and date of collection,and placed in ice-cooled storage for subsequent transport and analysis at Quanterra Environmental Services Laboratory located in Santa Ana, California Chain-of-custody procedures were followed at all times Selected soil samples were analyzed using EPA Method 8015 Modified (CADHS)for TPHg,and EPA Method CADHS for benzene, toluene, ethylbenzene, and total xylene isomers (BTEX), and methyl-tert-butylether (MTBE) After sampling, each boring was backfilled to the surface with neat cement and restored to match existing conditions 24 Waste Handling During drilling operations, all augers, sampling tools, and down hole equipment was steam cleaned prior to use. All soil cuttings and rinsate water generated during drilling operations is currently stored on-site in 55-gallon drums pending evaluation options for proper disposal A composite sample was . collected from the soil generated for waste profiling and analyzed for TPHg, BTEX, and MTBE Analytical results are presented m Appendix B 3.0 RESULTS 31 L1_t_b_Qloiz Soil samples collected from the borings during this investigation, consisted predominantly of sands clays, and salts In general,a sandy clay exists from near ground surface to approximately 9 feet bgs. A clayey to sandy salt exists from 9 feet bgs to approximately 30 feet bgs A sandy clay exists from 30 feet bgs to approximately 37 feet bgs Beneath the sandy clay, a sand exists from 37 feet bgs to approximately 42 feet bgs Under the sand, a gravelly sand exists from 42 feet bgs to approximately 51 feet bgs Beneath the sand, a sandy clay to clayey sand exists from 61 feet bgs to approximately 67 feet bgs From 67 feet bgs to approximately 70 feet bgs(the total sampled depth of soil boring CB-1),a sand was encountered Soil boring logs containing detailed descriptions of soil conditions encountered in each boring are included in Appendix C 32 1d Soil samples were selected on the basis of field observations and PID screening results A total of ten soil samples were analyzed for TPHg, BTEX, and MTBE. The distribution of soil sample analytical results for petroleum hydrocarbon constituents is illustrated on Figure 3 and summarized 43251NV RPT SECOR !0700-019-02 2 March 17 1997