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Julian Munoz February 11, 1987 3 1USSASSOCLATES TASK 2 - SOIL BORING AND SAMPLING OUTSIDE THE TANK CLUSTER AN ANALYSIS OF THE SAMPLES D CHEMICAL To meet local regulatory agency requirements, it is necessary to determine the vertical apd horizontal extent of fuel hydrocarbons outside the tank cluster. To do this we will drill two soil borings on each side of the rectangular excavation for a maximum of eight borings. We anticipate shallow borings since ground water should be encountered within 20 feet of the ground surface. During the drilling of each borehole, samples will be collected every five feet to determine the characteristics of subsurface materials. # These unsaturated soils will also be tested with a portable organic vapor analyzer (OVA) . If high concentrations of volatiles are found in these samples , they will be submitted to the analytic laboratory quantification. Once ground water is encountered, one saturated soil sample will be collected and submitted to the laboratory for chemical analysis. . All laboratory analyses will be by GC/FID for THC and BTX. The cost for rush turnaround chemical analysis, which can be performed if necessary, is itemized in our budget breakdown. TASK 3 - REPORT PREPARATION 5 Once analytic results have been reported to WA, a letter report will be prepared documenting our field activities and findings. It will summarize the results of the subsurface investigation and will address options for, further work if necessary. This report p it will include. i . O Description- of tasks performed; p o Lithologic logs of tangy: excavation and soil borings; a � O A cross-section of site geology; '' o A table summarizing soil sample analytic results; and O A map of the estimated distribution of fuel hydrocarbons . The vertical and horizontal extent of fuel hydrocarbons will wbe estimated from the soil boring and sampling data. A draft report will be furnished for your 1