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l Ms Lori Duncan Project No 8 80-03 9 1 01010000 August 3, 2004 Page 3 The groundwater samples were analyzed by Severn Trent Laboratory (NELAP #01119CA) in West Sacramento, California, for TPHg using U S Environmental Protection Agency (EPA) Method 8015M, and for BTEX and MTBE using EPA Method 8021B The results of laboratory analyses indicate that TPHg were present in wells MW-1R, MW-4R-S, MW-4R-D, VW-ID, VW-2, VW-3, and VW-4, at concentrations ranging from 100 to 73,000 micrograms per liter (pg/L) Benzene was reported in wells MW-1R, MW-4R-S, MW-4R-D, VW-1D, VW-2, VW-3 and VW-4 at concentrations ranging from 10 to 15,000 pg/L MtBE was not detected during this event Copies of the chain-of-custody records and laboratory analytical report are included in Appendix C On May 10, 2004, the shallow water table beneath the site appeared to form a trough trending northeast across the site (Figure 2) Groundwater flow north of the site was to the southeast at a gradient of 0 017, and beneath the southeast portion of the site, groundwater flow was to the northwest at a gradient of 0 06 Groundwater analytical data are summarized on Table 1 TPHg and benzene concentrations are shown on Figure 3 REMEDIATION SYSTEM STATUS' SECOND QUARTER 2004 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) Start up of the remediation ' system occurred on February 3, 2000, under the supervision of regulatory personnel Subsequently, Shaw staff perform weekly periodic O&M, collect influent and effluent air samples monthly in accordance with air board permit requirements, and report quarterly to the air board N 1sacDP120041Pri18801880039I A 4ac doc SHAW ENVIRONMENTAL,INC