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I GROUND WATER MONITORING REPORT FOURTH QUARTER 1993 Montgomery Ward Auto Service Center 5400 Pacific Avenue Stockton, California ' 1.0 INTRODUCTION ' This document constitutes the fourth quarter 1993 ground water monitoring report for the Montgomery Ward Auto Service Center (Montgomery Ward) property located at 5400 Pacific Avenue, Stockton, California (see Figure 1) for the period October 1993 through December 1993 The quarterly ground water monitoring and sampling is being ' conducted in accordance with a request from the San Joaquin County Public Health Services Department (County) ' As requested by the County, the gauging and sampling activities at the Montgomery Ward site were scheduled to occur on the same day that wells were gauged and sampled at the former Unocal Corporation (Unocal) gasoline station located at 5606 Pacific Avenue, Stockton, California 2.0 FIELD INVESTIGATION 2 1 GROUND WATER ELEVATION SURVEY On December 21, 1993, prior to purging or sampling activities, depth measurements to fluid levels were obtained using an interface probe accurate to 0 01 foot from the two wells (MW-1 and MW-2) located on the Montgomery Ward site Although arrangements were made with Unocals consultant, MPDS Services, Inc (MSI) to gauge and sample the Unocal wells, on this same date, MSI staff did not arrive at the scheduled time, so gauging of Unocal wells was not possible No free-product was detected in any of the Montgomery Ward wells The water level measurements for each well were converted to mean sea level (MSL) datum by subtracting the measured water level for each well from the ground level datum (see Table 1) 22 GROUND WATER SAMPLING ' On December 21, 1993, ground water samples were collected from the Montgomery Ward wells for analytical testing Prior to sampling, the wells were purged using a Grundfos MP-1 submersible pump Temperature, conductivity, pH and turbidity were recorded to evaluate the effectiveness of purging activities (see Appendix A) The wells were sampled to 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 samplers The use of these bailers precludes the potential for cross-contamination Mr Michael Infurna of the County was on-site during purging and sampling activities Project No 1232 1 ENVIRONMENTAL AUDIT, INC