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II Additional Soil and Groundwater Investigation Report Canepa's Car Wash(Pacific Avenue) January 21,2002 Page 6 emptied into a closeable plastic bag for headspace screening of volatile organic compounds (VOCs), and lithologic Iogging. The brass ring from the bottom of the sampler was removed, the ends covered with a clean Teflon sheet, and closed with plastic end caps. The sample ring was labeled and placed in a cooler chilled with blue ice. The soil from the upper brass ring was extruded and the intact portion was used for lithologic logging. 3.8 LABORATORY ANALYSES The soil and groundwater samples collected from the soil borings and monitor wells were analyzed for benzene, toluene, ethyl benzene, total xylenes (BTEX), and methyl tert-butyl ether (MTBE) by EPA Method 8020, and for total petroleum hydrocarbons quantified as gasoline (TPH-G) by EPA Method 8015 M. The groundwater samples collected from the hydropunch borings were analyzed for BTEX by EPA Method 8020, TPH-G by EPA Method 8015, and gasoline oxygenates, including MTBE, by EPA Method 8260. The composite soil sample was analyzed for lead by EPA Method 601013. The analytical parameters and detection limits are presented in Table 3 and Table 4 of Sections 4,2 and 4.3, respectively. Analytical laboratory certificates of analysis are included in Appendix E. 4.0 INVESTIGATION RESULTS 4.1 FIELD OBSERVATIONS Field observations made during the installation of the soil borings consisting of visual observations pertaining to site geology and photoionization detector (PID) screening data are included on the geological boring logs for the soil borings and monitor wells (Appendix Q. The soil encountered during drilling of the soil borings and monitor wells consisted of clayey silt, silty clay, clay, sand and sandy silt. The static depth to groundwater measured prior to well development was approximately 34.75, 33.96, 34.55, and 31.27 feet below ground surface in monitor wells MW-9 through MW-12d, respectively. 4.2 SOIL SAMPLING RESULTS Soil borings SB-3, S13-4, and the monitor well boring for MW-I I were installed to evaluate the extent of vadose zone soil contamination in the vicinity of the former underground storage tank (UST) location. Three samples from each boring were selected for laboratory analysis based on field observations. The soil sample laboratory analytical results are shown in Table 3 on the next page. Analytical results indicate that BTEX constituents and TPH-G were not detected at or above the laboratory reporting limit. in any of the i 1 soil samples. MTBE was detected at a concentration of 0.28 mg/kg, 0.005 mg/kg, and 0.009 mg/kg in soil samples S134-40, MW11-35, and MW11-40, respectively (Table 3). A soil sample composited from soil samples MW9-35, MW10-40, S133-35, S134-30, and MW11-35 was analyzed for total lead(3.7 mg/kg)to characterize the soil for potential future disposal. i `� CONDOR