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Mr Ronald Rowe Project 22640-100 001 • May 21, 1999 Page 3 Borings were converted to 2-inch diameter monitoring wells constructed using schedule 40 polyvinyl chloride casing Screen intervals were selected based on PID/FID readings and lithology The wells were installed to depths of 105 (MW-9) and 106 (MW-8) feet bgs Monitoring wells were developed and sampled on April 9, 1999, consistent with methods presented in Appendix C Well development and sampling field sheets are presented in Appendix D Groundwater samples were submitted to a state certified analytical laboratory using appropriate chain of custody documentation Soil and groundwater (HydroPunch and monitoring well) samples were analyzed for total petroleum hydrocarbons as gasoline (TPHG) lasing CA/LUFT, benzene, toluene, ethylbenzene, total xylenes (BTEX) using USEPA Method 8020, and fuel oxygenates (tert- butyl alcohol [TBA], methyl tent-butyl ether [MTBE], di-isopropyl ether [DIPS], ethyl tert- butyl ether [ETBE], and tert-amyl methyl ether [TAME], using USEPA Method 8260 One soil sample from each boring was analyzed for Soluble Threshold Limit Concentrations (STLC) for BTEX and fuel oxygenates ANALYTICAL RESULTS Soil samples from boring B-1 contained detectable concentrations of TPHG ranging from 13 to 1000 milligrams per kilogram (mg/kg) BTEX constituents were detected in soil samples from B-1 in the following ranges benzene 0 79 to 10 mg/kg, toluene 3 7 to 68 mg/kg, ethylbenzene 0 36 to 22 mg/kg, and total xylenes 2 3 to 120 mg/kg TPHG was not detected in any soil samples from boring B-2 BTEX constituents were detected in one sample (B-2 102 ft bgs) as follows benzene 0 049 mg/kg, toluene 0 025 mg/kg, ethylbenzene 0 016 mg/kg, total xylenes 0 019 mg/kg Benzene was detected in sample B-2 82 ft bgs at a concentration of 0 006 mg/kg No other BTEX constituents were detected Neither MTBE nor other fuel oxygenates were detected in any soil samples HydroPunch groundwater samples contained detectable concentrations of TPHG, BTEX, and fuel oxygenates MTBE and Tert-Butyl Alcohol TPHG concentrations in HydroPunch samples from B-1 were 120,000 micrograms per liter (ugh) at 70 It bgs and 21,000 ug/1 at 100 ft bgs Benzene concentrations were 15,000 ug/1 and 2,100 ugh at 70 ft and 100 ft, respectively • ME IAPACii1;1REP0RTSWACP102 DOC-98Usg 1 Emcon