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GROUND WATER MONITORING REPORT . FOURTH QUARTER 1994 I Montgomery W�'d Auto Service Center 5400�Pacific Avenue Stockton, California 1.0 INTRODUCTION This document constitutes the fourth quarter (October through December) 1994 ground I water monitoring report for the Montgomery Ward Auto Service Center property located at 5400 Pacific Avenue, Stockton, California (see Figure 1) 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 occurred on the same day that wells were gauged and sampled at the former Unocal branded service station located at 5606 Pacific Avenue, Stockton, California 2.0 FIELD INVESTIGATION I r 21 GROUND WATER ELEVATION SURVEY On December 6; 1994, 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 (see Figure 2 and Table 1) Table 1 also contains well gauging information from wells MW-10, MW-11, MW-12, MW-13, MW-14 ' and MW-15 located at the former Unocal site (see Figure 2) No free-product/vas detected in the two Montgomery Ward wells, and no free-product was reported in wells associated with the former Unocal site (see Table 1) 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) The data in Table 1 were used to construct a ground water elevation map (see Figure 2) ' 2 2 GROUND WATER SAMPLING On December 6, 1994, an Environmental Audit, Inc (EAI) geologist collected ground water samples for analytical testing from the two Montgomery Ward wells Prior to sampling, .v -- -"- -- --- - -�.a . ._� r_. .. ar lkXn i t_ - i.i _.. - We wells wore purged usin a G uirurUJ rvrl -r suUrllersiule yaillp 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 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 I ' Project No 1232 1 ENVIRONMENTAL AUDIT, INC