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Ms. Carol Oz Project 791701.008 October 19, 1999 Page 3 zone at approximately 80 feet bgs. Shallow zone groundwater samples were not collected from CPT-1 and CPT-3. Pinnacle attempted to collect water samples at depth of 50 feet bgs; however, the silts present at this depth did not yield sufficient water for sample collection. After sampling, HydroPunch sampling equipment was disassembled and decontaminated using a steam cleaner. Boreholes were grouted upon completion as previously described. Groundwater samples collected during the investigation were submitted to a state-certified analytical laboratory (Sequoia Analytical) and analyzed for total petroleum hydrocarbons as gasoline (TPHG) and the gasoline constituents benzene, toluene, ethylbenzene and total xylenes (BTEX) using U.S. Environmental Protection Agency Methods 8015/8020 to provide information for additional lateral and vertical plume definition. Additionally, these samples were analyzed using Method 8260 for methyl tertiary butyl ether (MTBE) and other oxygenates. Pinnacle field procedures are presented in Appendix B. ANALYTICAL RESULTS Analytical results are presented in Tables 1 and 2. Copies of certified analytical reports (CARS) and chain of custody (COC) documentation are presented in Appendix C. Soil Samples Soil samples collected from borings CPT-1 through CPT-3 were analyzed for TPHG by USEPA Method 8015, BTEX and MTBE by USEPA Method 8020, and oxygenates by USEPA Method 8260. None of the soil samples contained detectable concentrations of TPHG and BTEX above their respective method reporting limits. MTBE was reported in samples collected from CPT-2 at 35 and 55 feet below ground surface (bgs). Tfie vertical extent of MTBE impacts was defined. No other oxygenates were reported. Soil analytical results are shown on Table 1. Copies of certified analytical reports and chain of custody documentation are presented in Appendix C. HydroPunch Samples HydroPunch groundwater samples were collected from CPT-1 and CPT-3 at 80 feet bgs and from CPT-2 at 55 feet bgs and 80 feet bgs. TPHG was not detected in the groundwater samples collected. Benzene was detected in CPT-2 at 55 feet at 0.641 micrograms per liter (ugh). The benzene concentration was below MCL of 1.0 ugh and vertical extent was defined. MTBE was detected in CPT-2 at 55 and 80 feet bgs at 412 and 27 ugh, respectively. Analytical results are presented in Table 2. Copies of certified analytical reports and chain of custody documentation are presented in Attachment C. CP'1C:1ArchiveWrco121861Reports\2186p106.doc