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Adequate recovery was observf d 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 for the organic chemical analysis and to Severn Trent Laboratories in Pleasanton, California for the Inorganic chemical analysis tA total of six inches of free-floating product was observed in monitoring well MW-3 Due to the presence of free product no groundwater sample was collected from MW-3 The water samples were analyzed for TPHg following EPA Method 8015 and for BTEX and FOCs t following EPA Method 8260 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 ' 33 Remediation System Operation and Maintenance and Performance Summar V q ' 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 October 15, 2003 and January 9, 2004 is presented below 3 3 1 SVE System ' The SVE system is comprised of a skid-inounted 300-cfin 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 October 15, 2003 through January 9, 2004, the SVE system was approximately 87% ' operational The system was down for seven days between October 28 and November 4, 2003 while waiting for carbon change out, down for two days between December 2 and December 4, 2003 while ' waiting for carbon change out, and down for two days between January 7 and January 9, 2004 as the transition period between the 300-cfm blower and the 300-cfm electric catalytic oxidizer (300- ECAT) The 300-ECAT system was non-operational during this reporting period ' The averse vacuum for the SVE system was 73 inches of water, and the average flow rate was 265 g Y g ' cfin The average SVE system influent TPHg concentration during the reporting period was 277 parts per million volume (ppmv) ' The SVE system removed approximately 111 pounds of TPHg, 1 4 pounds of benzene, and 0 pounds of MTBE during the ieporting period The SVE system operational and analytical data including ' hours of operation, applied vacuum, flow rate, field PID data, influent TPHg and benzene concentrations, and mass removal data are presented in Table 3 ' Project No 58643-06-01 -5- February 18,2004