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' FOURTH QUARTER 1998 GROUND WATER MONITORING REPORT San Joaquin County Montgomery Ward Auto Service Center Publu,Health Services Department ' 5400 Pacific Avenue,Stockton,CA Site Code 2163 1.0 INTRODUCTION 1 This document constitutes the Fourth Quarter (October through December) 1998 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 quarterly 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) 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 Site Therefore, at the request of the County, EAI gauged all the vapor extraction wells (VEW-IA, VEW-1B, VEW-2, VEW-2B, and VEW-3 through VEW-5) and sampled four of the vapor extraction wells (Wells ' VEW-213, VFW-3, VEW-4 and VEW-5) at the Site since these wells were screened at the ground water level The vapor extraction wells were constructed as part of proposed remedial action for the Site to extract and treat hydrocarbons from hydrocarbon impacted soil The vapor extraction wells have not been used for this purpose 2.0 FIELD INVESTIGATION I 21 GROUND WATER ELEVATION SURVEY ' On December 22, 1998, prior to purging or sampling activities, depth measurements to fluid levels were obtained by EAI from all monitoring wells (wells MW-1 through MW-7) and vapor extraction wells dssociated 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-17) I 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) I Project No 1232 - 1 - ENVIRONMENTAL AUDIT, INC