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Mr John Benedict Project 880039 1A February 22, 2002 Page 3 a concentration of 100 gg/L MTBE was below laboratory reporting limits in MW-1R and VW-2 Results of laboratory analyses are summarized in the Table 1 The results of the point monitoring on August 16, 2001 were used to evaluate the groundwater gradient The gradient was approximately 0 002 foot per foot to the southeast (Figure 2) Groundwater analytical data for the subject site and for the former ARCO facility 2168 on August 16, 2001 are also summarized on Figure 2 REMEDIATION SYSTEM STATUS: FOURTH QUARTER 2001 The remediation system consists of four shallow zone and three deep zone 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, TT staff perform weekly system O&M, collects influent and effluent air samples monthly in accordance with air board permit requirements, and reports quarterly to the air board Sampling Results On October 15 November 11 and December 10, 2001, vapor samples were collected from treatment system influent and effluent Samples were submitted to Sequoia Analytical in Sacramento, California, a state-certified laboratory, for analysis of TPH-g and BTEX using USEPA Methods 8015 and 8020, respectively TPH-g was detected in the October, November and December 2001 influent samples at 4,000, 1,200, and 1,400 milligrams per cubic meter (mg/m3), respectively Benzene was detected in the October and November 2001 influent samples at 15 and 3 2 mg/m3, respectively Benzene was non-detectable in December 2001 influent sample TPH-g was detected in the October and December 2001 effluent samples at 10 and 12 mg/ m3, respectively TPH-g was non-detectable in the November 2001 effluent sample Benzene was non-detectable in all effluent samples Laboratory analytical reports and chain-of-custody documentation are presented in Appendix D System Performance Status The treatment system operated 59 days (66 percent operational) dunng the Fourth quarter 2001, removing 505 pounds of TPH-g System TPH-g emissions were maintained below 0 06 pounds per day, which rs well below the allowable TPH-g emission rate of 6 1 pounds per day TPH-g destruction efficiency was maintained above 99 percent, and benzene destruction efficiency was IT CORPORATION SAC 1USACRFPIICOMMOMsacbP120021PRAPJ8188018800391A 2aa doe-001st 1 (01010000)