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QUARTERLY GROUND WATER MONITORING Site Code 2163 Montgomery Ward Auto Service Center 5406 Pacific Avenue Stockton CA ' 1.0 INTRODUCTION ' This document constitutes the first quarter (January through March) 1995 ground water monitoring report for the Montgomery Ward Auto Service Center property located at 5400 Pacific Avenue, Stockton, California (Site) (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) The first quarter 1995 ground water monitoring activities at the Site were conducted in February ' instead of March in order to coordinate the initial sampling of the wells MW-3 through MW-6 which were constructed in January 1995 with quarterly ground water monitoring activities (see EAI, 1995) This change in the first quarter 1995 monitoring schedule was verbally approved of ' by the County (Mr Michael Infurna) ' 2.0 FIELD INVESTIGATION 2 1 GROUND WATER ELEVATION SURVEY On February 8, 1995, prior to purging or sampling activities, depth measurements to fluid levels were obtained using an interface probe accurate to 0 01 foot from the six wells (MW-1 through MW-6) located on the Montgomery Ward site (see Figure 2 and Table 1) Table 1 also contains well gauging Information from wells MW-10 through MW-15 located at the former Unocal site (see Figure 2) No free-product was detected in the 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 wells on the Montgomery Ward site were regauged on February 27, 1995 to confirm the ground water elevations as obtained on February 8, 1995 (see Table 1) Ground water elevation maps were constructed from both the February 8 and 22 data(Figures 2 and 3) 2 2 GROUND WATER SAMPLING ' On February 8, 1995, an Environmental Audit, Inc (EAI) geologist collected ground water samples for analytical testing from the six Montgomery Ward wells Prior to sampling, the wells were purged by V & W Drilling Inc as part of well development activities using a Mobile B-61 ' HDX rig with an eight-foot long 3'/2-inch diameter stainless steel bailer Temperature, conductivity, pH, and turbidity were recorded to evaluate the effectiveness of nttrainn artiwitiac (aaa 1l"P 4,- Al 'M 11�. . ,d a tuhat ,__ .+..�a..'T `JVV 1 lrl�JV tl zA I►) iiiv rr'e iii v��.r i. $a1i1p1c.0 111 llle 1Jr der 111d1 �J Ui gitlg d[.C1 v1L1C5 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 Infuma of the County was on-site during the onset of purging and sampling activities Project No 1232 1 ENVIRONMENTAL AUDIT, INC