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1 P, Mr John Benedict Project 880-039 IA ' October 22, 2001 • Page 3 BTEX and MTBE using USEPA Method 8020 Copies of the chain-of-custody records and laboratory analysis reports are presented in Appendix C The results of laboratory analyses indicated that dissolved hydrocarbons were present in all three wells TPH-g was detected in MW-1R, VW-2, and VW-3 at a concentrations of 390, 41,000, and 14,000 micrograms per liter (gg/L), respectively Benzene was reported in MW-R1, VW-2, and VW-3 at 13, 5,600, and 3,400 µg/L, respectively MTBE was reported in MW-R1 and VW-2 at concentrations of 46 and 280 µg/L, respectively MTBE was below laboratory reporting limits in VW-3 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 0 002 foot per foot to the southeast (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: THIRD QUARTER 2001 The remediation system consists of four shallow zone and three deep zone soil vapor extraction lie (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 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 A 9 During the third quarter 2001, the treatment system was shut down on July 24, 2001 pending contract negotiations Soil vapor samples were collected from influent and effluent sample ports on July 16, 2001 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 July 16, 2001 was reported to be 40 milligrams per cubic meter (mg/m3) The corresponding effluent TPH-g concentrations was <2 0 mg/m3 Benzene was not detected, above the laboratory reporting limit, in the influent and effluent samples collected on July 16, 2001 Laboratory analytical reports and chain-of-custody documentation are presented in Appendix D IT CORPORATION SAC Vhf>„cecDPt20031PRJ1PJ818800391 A lab doc 00'ut 1 (01010000)