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Ms Lori Duncan Project No 880-039 IA January 30, 2004 Page 3 indicate that TPHg were present in wells MW-4R-S, MW4R-D and VW-2, at concentrations ranging from 81 to 52,000 micrograms per liter (pg/L) Benzene was reported in wells MW-3R, MW-4R-S, MW-4R-D, VW-2 and VW-3 at concentrations ranging from 7 5 to 7,000 ug(L MTBE was not detected by USEPA Method 8260B in any of the seven wells sampled Copies of the chain-of-custody records and laboratory analytical report are presented in Appendix C The groundwater gradient was approximately 0 008 with groundwater flow to the north-east (Figure 2) Groundwater analytical data are summarized on Table 1 TPHg and benzene } concentrations are shown on Figure 3 E REMEDIATION SYSTEM STATUS: FOURTH QUARTER 2003 The remediation system consists of four shallow zone and three deep zone soil vapor extraction (SVE) wells, from which soil vapors are extracted using a Stealth Bobcat Catalytic Oxidizer rated at 100 cubic feet per minute (cfm) Startup of the remediation system occurred on February 3, 2000, under the supervision of regulatory personnel Subsequently, Shaw staff perform weekly system O&M, collect influent and effluent air samples monthly in accordance with air board permit requirements, and report quarterly to the air board Sampling Results On October 13, November 3, and December 8, 2003, vapor samples were collected from treatment system's influent and effluent Samples were submitted to Sierra Analytical (FLAP j #2320) for analysis of TPHg and BTEX using USEPA Methods 8015 and 8020/8021 TPHg and BTEX concentrations were below the detectable limits during each sampling event Laboratory analytical reports and chain-of-custody documentation are presented in Appendix D System Performance Status In the 91 days between September 30, 2003, and December 29, 2003, the treatment system ran approximately 80 days (88 percent operational), removing approximately 5 pounds of TPHg, as shown on Table 2 The system's TPHg emissions were maintained below 0 06 pounds per day, below the allowable TPHg emission rate of 6 1 pounds per day TPHg and benzene destruction efficiencies were maintained at approximately 97 percent The burn chamber temperature ranged from 750°F to 778°F, well above the minimum required burn temperature of 600°F N Isac)P120041PgW80W800391A 4aa doc Shaw Environmental,Inc