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,F) td Mr Kenneth Earnest December 5, 1994 Page 2 Contacts between the soil types varied between gradational and sharp The boring was terminated at 50 feet below grade Soil borings SB-5 and SB-6 were also terminated at 50 feet below grade, and soil borings SB-1, SB-2, and SB-3 were terminated at approximately 60 feet below grade Ground water was not encountered in soil borings SBA through SB-6 Soil borings SBA and SB-2 were advanced within 16-inch-diameter polyvinyl chloride (PVC) casings, which were installed during the underground storage tank replacement in November 1993 Soil boring SB-3 was advanced at an angle of 30 degrees toward the northeast from vertical beneath the pump island area (Figure 3) Soil boring logs containing descriptions of soil conditions encountered in each boring are included in Enclosure B Soil Sample Analytical Results A portion of each soil sample collected from the soil borings was sealed in a plastic bag, placed out of direct sunlight, and allowed to reach ambient air temperature The headspace of the bag was then screened in the field with a photoionization detector (PID) Soil samples were selected for chemical analysis on the basis of PID screening results and the location of the soil samples in relation to the most likely source of petroleum constituents Four to six soil samples collected from each boring were submitted for analysis of concentrations of BTEX, TPHd, and TPHg Analytical results of soil samples submitted by AMV are summarized in Table 1 Copies of certified analytical reports for soil samples submitted for laboratory analysis during this phase of work are contained in Enclosure C Only two soil samples submitted for analysis contained concentrations of BTEX and TPHg above the laboratory detection limit Soil samples S132-7 and S132-8, collected trom soil boring SB-2 at 35 and 40 feet below grade contained TPHg concentrations of 210 and 630 milligrams per kilogram (mg/kg), respectively Concentrations of benzene in these two soil samples were reported at less than 0 050 mg/kg Concentrations of TPHd in soil samples collected trom soil borings S13-3 through SB-6 were reported to be less than the reporting limits for all soil samples submitted for analysis Soil samples collected from soil borings SBA and S13-2 contained concentrations of TPHd ranging from les: than 1 0 to 6,600 mg/kg in soil sample SB2-8, collected at 40 feet below grade (Table 1) One soil sample collected trom soil boring SB-2 at 40 feet below grade was submitted for laboratory analysis to determine the mobility of petroleum constituents in the soil beneath the site The test was performed for BTEX, TPHg, and TPHd Both tests involved placing sample material (soil) in a container and adding a measured quantity of liquid, in this case deionized water The sample is then agitated for a specified time period and the liquid is filtered and extracted The "extract" was analyzed for the previously mentioned parameters Results of the "Wet DV and "TCLP Extract" tests are presented in Table 2 ACTON • IrpM7 gss MICKELSON van DAM, INC Consulting Scientists Engineers,and Geologists