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R_ In the First Quarter 2004, up to six inches of free product was observed in groundwater monitoring well MW-3 and only a sheen of free product was observed in Second and Third Quarter 2004. Approximately one-half inch of free product was measured in well MW-3 during'the Fourth Quarter 2004 monitoring event. 3,3 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-efm blower and catalytic oxidizer(SCAT-250) with knockout pot manifoided to ten SVE wells (V-1.through V-10). During the reporting period,the y -SVE system was approximately 89% operational. On April 13 and 20,the chart paper was changed out. On May 3, 10, 17, 26, and 31, the chart paper was changed out and contaminant concentrations, . flow, and vacuum were monitored in extraction wells V2,-V3, V5, and V6,the only wells open to the . SVE skid. On May 3, vapor influent and effluent samples were 'collected and transported to Kiff F.+ Analytical for analysis. On May 26,the flow and vacuum were adjusted to direct vacuum and flow to those wells with the highest PID readings. On June 7, 14, 21, and 27,the chart paper was changed out.'On June 8,monitoring was conducted on wells V2, V3, V5, and V6. Vapor influent and effluent samples were collected and transported to Kiff Analytical for-analysis. Adjustments were made to direct more vacuum and flow to those wells with the highest FID readings. On July 6, 13, 20, and 27,the chart paper was changed out. On July 6, monitoring was conducted on wells V2, V3, V5, and V6. Vapor influent and effluent samples were collected and transported to Kiff Analytical for analysis. Adjustments were made to direct more vacuum and flow to those wells with the highest PID readings. On August 10, 17, 23, and 31, the chart paper was changed out. On August 3, monitoring was . t conducted on wells V2, V3, V5, and V6. Vapor influent and effluent samples were collected and transported to Kiff Analytical for analysis. The PID reading for the effluent was at 53 ppm and was assumed that.this PID reading was indicative of an effluent discharge concentration that would Project No.S8643.06-01 -6- December 30,2004