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' Quarterly Monitoring Report - Fourth Quarter 2000 • Mel Bokides Petroleum, Inc. 501 W. Lodi Avenue, Lodi, California ' 1.0. INTRODUCTION ' At the request of Mr. Nicholas Bokides of Mel Bokides Petroleum, Inc., Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly monitoring report for 501 W. Lodi Avenue, Lodi, California (site). The site setting is illustrated on Figure 1. Site structures and ' monitoring well locations are depicted on Figure 2. The scope of work was to monitor and sample six ground water monitoring wells on the site, sample and monitor the soil vapor extraction system on the site. The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site and determine effectiveness of the soil vapor extraction unit ' on the site. A summary of previous investigations at the site was included in the Work Plan for Site Assessment, Mel Bokides Petroleum, 501 West Lodi Avenue, Lodi, California, dated 15 May 1998, prepared by AGE. lie 2.0. PROCEDURES ' Field work was conducted and this report prepared in accordance with guidelines established by the Central Valley Regional Water Quality Control Board (CVRWQCB) and directives issued by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) for ' subsurface investigations and sampling of ground water monitoring wells at sites with former underground storage tank(UST) systems. 2.1.. MONITORING WELL PURGE PROCEDURES ' On 06 October 2000 the depth to ground water in each monitoring well was measured to the nearest 0.01-foot utilizing a Solist water level meter. Ground water elevations from BMW-1 through BMW- ' : 5 (site wells) and MW-5 (off-site well) were then calculated by subtracting the measured depth to ground water from the surveyed casing elevations (Table 1). Ground water elevations were plotted and contoured on a scaled site map (Figure 3). After water levels were-'in-e-asured; approximately 40 gallons `(a nniriirrium of`three"casing-water volumes per well) of water were purged from wells BMW-1 and BMW-2 and approximately 9 to ' 12 gallons of water were purged from the remaining wells utilizing a two-stage submersible pump. An ICM Model 52200 water analyzer was utilized to monitor temperature, pH and conductivity of purged water at regular purge-volume intervals. Stabilization data and field logs are included in Appendix A. Purged ground water was containerized in 55-gallon drums and stored on-site. Advanced Geo Environ mental,Inc.