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A submersible pump was lodged in the casing of groundwater monitoring well MW-5D during the Third Quarter 2003 sample event disabling sample collection The submersible pump was recovered Ion July 29, 2003 enabling sample collection in well MW-5D for the Fourth Quarter sampling event Adequate recovery was observed in the purged wells prior to sampling A disposable bailer was used ' to collect the groundwater samples All samples were decanted from the bailer into the appropriate containers, preserved with ice, and transported under chain-of-custody protocol to Advanced ' Technology Laboratory(ATL) in Signal Hill, California The water samples were analyzed for TPHg and BTEX following EPA 8015 Modified and EPA ' 8020, respectively Per the RWQCB written request, the water samples collected from wells MW-5, MW-5D, MW-6, and MW-9 were analyzed for dissolved metals following EPA Method 200 8 and for mercury following EPA Method 245 1 33 Remediation System Operation and Maintenance and Performance Sumimarj ' Operation and maintenance (O&M) of the remediation system is performed monthly (or as needed) Photo ionization detector (PID) readings from the SVE effluent and influent is performed weekly as ' required by the San Joaquin Unified Air Pollution Control District A brief description and performance evaluation of the remedial system between July 16, 2003 and October 15, 2003 is presented below 3 3 1 SVE System ' The SVE system is comprised of a skid-mounted 300-scfm blower with knockout pot manifolded to ten SVE wells (V-1 through V-10) with GAC used as the abatement device During the reporting ' period of July 16, 2003 through October 15, 2003, the SVE system was approximately 78% opei ational The system was down for several hours on July 23, 2003,down for twelve days between August 6 and August 19, 2003 while waiting for carbon change out and repairs to the SVE blower, ' down for a partial day on September 16117, 2003 due to loss of electricity, and down for six days between September 26 and October 2, 2003 waiting for a carbon change out ' The average vacuum for the SVE system is 67 inches of water, and the average flow rate is 371 cfin The average SVE system influent TPHg concentration during the reporting period was 397 parts per million volume (ppmv) The SVE system removed approximately 294 pounds of TPHg, 3 8 pounds of benzene, and 0 pounds of MTBE during the reporting period The SVE system operational and analytical data Including houis of operation, applied vacuum, flow rate, field PID data, influent TPHg and benzene ' concentrations, and mass removal data are presented in Table 3 Prolt,Lt No 58643-06-01 -5- November 3,2003