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i IQuarterly Report - First Quarter 2005 • Former MEL BOKIDES PETROLEUM - Linden 8203 East Highway 26, Stockton, California I1.0. INTRODUCTION At the request of Mr Nick Bokides of Mel Bokides Petroleum(MBP),Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 8203 East Highway 26, Stockton, California(site) The scope of work included operation,maintenance and sampling of a soil-vapor extraction system, quarterly ground water monitoring and preparation of this report The report was prepared in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB)for subsurface investigations of former underground storage tank (UST) systems The site location and site plan are illustrated on Figures 1 and 2,respectively, site background information is summarized in Appendix A Four soil-vapor extraction wells (V W 1 A, V W 1 B, V W2 and V W3) have been installed at the site, one well(VW 1 B)screened in petroleum hydrocarbon-impacted soil and the others screened in clean soil, however, based on individual SVE well feasibility testing, AGE determined that well VW1B should adequately capture soil-vapor to mitigate the adsorbed hydrocarbons at the site,while use of the remaining wells have demonstrated counter-productive results • 2.0 PROCEDURES All field work procedures and reporting requirements are in accordance with guidelines issued by the Central Valley Region of the Regional Water Quality Control Board (CVRWQCB) for subsurface investigation of underground storage tank(UST)system sites and the San Joaquin County Environmental Health Department (EHD) for sampling of ground water monitoring wells The operation and monitoring of the soil-vapor extraction system was in accordance with the AGE- prepared Soil Remediation - System Design, dated 01 September 2004 and approved by the EHD ' 21 SOIL-VAPOR EXTRACTION SYSTEM Well VW 1 B had been piped directly to the soil-vapor extraction unit(VES)located within a fenced ' enclosure on the north side of the site(Figure 2)using 2-inch diameter Schedule 40 PVC piping In- line,the VES consists of a 55-gallon moisture knockout vessel for moisture separation and to prevent water collection within the treatment media, three 300-pound (lb) carbon canisters, then a Fuji, 5- horsepower, regenerative vacuum blower capable of drawing a maximum 110 standard cubic feet per minute(scfm)of vapor,and finally two 1,500-pound carbon vessels to adsorb hydrocarbon vapor from the subsurface (Figure 2) The SVE unit is operated in accordance with San Joaquin Unified ' Air Pollution Control District (APCD) permit 5984-1 • IAdvanced GeoEnvironmental,Inc I