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1 Free product has been observed in well MW-3 intermittently since Fourth Quarter 2003 Approximately one-half inch of free product was observed in well MW-3 at the time of the Fourth IQuarter 2004 sample event No free product was observed during the First and Second Quarters 2005 sample event, however, a product sheen was observed on the purge water and the water in the sample Icontainers during both of these sampling events 33 Remediation System Operation and Maintenance and Performance Summary ' 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 monthly as ' required by the San Joaquin Unified Air Pollution Control District (SJUAPCD) As required by SJUAPCD, a chart recorder provides a continuous chart of the catalytic oxidizer temperature The chart paper is changed out on a weekly basis A brief description and performance evaluation of the ' remedial system for the reporting period is presented below ' 3 3 1 SVE System The SVE system is comprised of a skid-mounted 250-cfm blower and catalytic oxidizer (SCAT-250) ' with knockout pot manifolded to ten SVE wells (V-1 through V-10) During the reporting period, the SVE system was approximately 100% operational On February 3, 11, 18, and 25, March 4, 14, 21, and 28, and April 4, 11, and 19, the chart paper was changed out On March 7, Geocon mobilized to the site to collect the SVE influent and effluent samples for laboratory analysis and to adjust flows and vacuums on various wells to maximize contaminant ' removal The contaminant concentration, flow, and vacuum were monitored in extraction wells V2, V3, and V6 Based on vacuum readings, flows, and PID readings no adjustments were necessary On April 6, Geocon mobilized to the site to collect the SVE influent and effluent samples for laboratory analysis and to adjust flows and vacuums on operating wells to maximize contaminant ' removal The contaminant concentration, flow, and vacuum were monitored in extraction wells V2, V3, and VE-6 Vacuum pressures were adjusted by changing valve openings on VE-2 and VE-3 IThe approximate vacuum for the SVE system during the reporting period was 97 5 inches of water, and the approximate flow rate was 201 cfm The average SVE system influent TPHg concentration 1 during the reporting period was 90 5 parts per million volume (ppmv) ' Project No 58643-06-01 -6- May 5 2005 1