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' SEMI-ANNUAL GROUND WATER MONITORING REPORTan S Joaquin County Public Health Services ' JANUARY THROUGH JUNE 2000 Montgomery Ward Auto Service Center Site Code 2163 5400 Pacific Avenue,Stockton,CA EAI Project No 1232 ' 10 INTRODUCTION ' This document constitutes the semi-annual (January through June) 2000 ground water monitoring report for the Montgomery Ward Auto Service Center property located at 5400 Pacific Avenue, Stockton, California (Montgomery Ward site) (see Figure 1) Environmental ' Audit, Inc (EAI) was retained to complete the monitoring The semi-annual ground water monitoring and sampling is being conducted in accordance with a request from the San Joaquin County Public Health Services Department (County) The County Identifies the Site by Site Code 2163 As requested by the County, the gauging and sampling activities at the Montgomery Ward site were coordinated to occur at the same time as the gauging and sampling at the former Unocal ' service station located at 5606 Pacific Avenue, Stockton, California (Unocal site) (see Figure 1) Gauging and sampling at the former Unocal site was conducted by Gettler-Ryan Inc Historical high ground water levels at the Site have the current depth of first ground water over ' well screened intervals in all seven ground water monitoring wells at the Montgomery Ward site The vapor extraction wells (VEW-IA, VEW-1B, VEW-2, VEW-213, and VEW-3 through VEW- 5) were neither gauged nor sampled during this quarter since these wells have been connected to the vapor extraction system and are currently inaccessible 20 FIELD INVESTIGATION 2.1 Ground Water Elevation Survey On June 15, 2000, prior to purging or sampling activities, depth measurements to fluid levels ' were obtained by EAI from all monitoring wells (MW-1 through MW-7) associated with the Montgomery Ward site The depth measurements were obtained using an Interface probe accurate to 0 01 foot (see Figure 2 and Table 1) Table 1 also contains well gauging information from wells (wells MW-10 through MW-22D) associated with the Unocal site provided to EAI by Unocal's consultant Gettler-Ryan, Inc (see Figure 2) No free-product was detected in any of the wells The water level measurement for ' each well was converted to mean sea level (MSL) datum by subtracting the measured water level for each well from its respective "top of well casing elevation" datum (see Table 1) 22 Ground Water Sampling On June 15, 2000, ground water samples were collected by EAI from all ground water monitoring wells associated with the Montgomery Ward site Prior to sampling, the wells were purged using a Grundfos MP-i submersible pump Temperature, conductivity, pH, and turbidity were recorded to evaluate the effectiveness of ' purging activities (see Appendix A) The wells were sampled in the order that purging activities were completed Water samples were collected from each well from dust below the water surface using Voss Technologies disposable bottom bailers equipped with volatile organic compound sampling tips The use of these bailers precludes the potential for cross-contamination BHM 1232R0061 1 ENVIRONMENTAL AUDIT, INC i