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Mr John Benedict Project 880039 IA Apn1 19, 2001 Page 3 23 8 gg/L, 5 64 µg/L, 12 3 µg/L, and 7 26 µg/L, respectively MTBE was below laboratory reporting limits Results of laboratory analyses are summarized in the Table 1 The results of the point monitoring were used to evaluate the groundwater gradient The gradient is approximately 0 003 foot per foot to the east-northeast (Figure 2) Groundwater analytical data for the subject site and for the former ARCO facility 2168 are also summarized on Figure 2 ' REMEDIATION SYSTEM STATUS: FIRST 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, IT staff perform weekly system operation and maintenance, collects influent and effluent air samples monthly in accordance with air board permit requirements, and reports quarterly to the air board Sampling Results During the first quarter 2001, soil vapor samples were collected from influent and effluent sample ports on January 4, February 5, and March 5, 2001 Vapor samples collected on January 4, 2001 were reported in the fourth quarter 2000 report The 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 Influent TPH-g concentrations on February 5, 2001 and March 5, 2001 were reported to be 473 and 228 milligrams per cubic meter (mg/m'), respectively The corresponding effluent TPH-g concentrations were 50 4 and 18 4 mg/m3, respectively ' Benzene was not detected above the laboratory reporting lima, in the influent samples collected on February 5 and March 5, 2001, and in the effluent sample collected on February 5, 2001 Benzene was detected In the effluent sample collected on March 5, 2001 at a concentration of 0 0808 mg/m3 Laboratory analytical reports and chain-of-custody documentation are presented ' In Appendix D Operational Status The treatment system operational uptime was 87 percent during the first quarter 2001 Down ' time resulted from possible power interruptions on two occasions and high water levels in the treatment system moisture knockout pot To improve system destruction efficiency, on January 4, 2001, the catalyst was serviced and on February 5, 2001, the burn chamber temperature set- IT CORPORA TION SAC IN\rancfpllProjectsTrojects188010391iA\Quarterlysl1g01 doc-Mit 1 (01010000)