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Ms Lori Duncan October 28, 2004 Page 3 Project No 880-039 lA 01010000 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 8021 B The results of laboratory analyses indicate that TPHg were present in wells MW -1R, MW -4R -S, MW -4R -D, and VW -1D through VW -4, at concentrations ranging from 70 to 61,000 micrograms per liter (µg/L) Benzene was reported in wells MW -4R -S, MW -4R -D, and VW -113 through VW -4 at concentrations ranging from 4 7 to 7,200 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 August 9, 2004, groundwater flow beneath the site was to the northeast at a gradient of 0 008 Groundwater analytical data are summarized on Table 1 TPHg and benzene concentrations are shown on Figure 3 REMEDIATION SYSTEM STATUS- THIRD 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 periodic 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 July 19, August 9, and September 28, 2004, vapor samples were collected from treatment system's influent and effluent Samples were submitted to Severn Trent Laboratories for analysis of TPHg and BTEX using Method EPA -19 TO -3 A summary of TPHg and benzene results are summarized in Tables 2 and 3 Laboratory analytical reports and chain -of -custody documentation are included in Appendix D System Performance Status In the 99 days between June 22, 2004 and September 28, 2004, the treatment system ran approximately 92 days (93 percent operational), removing approximately six pounds of . TPHg as shown on Table 2 The system's TPHg emissions were approximately 0 10 pounds per day, below the allowable TPHg emission rate of 6 1 pounds per day sib N lsacbP120041Prj188018800391 A 4ad doe SHAW ENVIRONMENTAL, INC