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FIELD REPORT <br />1993 FOURTH QUARTER WATER SAMPLING <br />FORMER MAJOR MART FACILITY <br />STOCKTON, CALIFORNIA <br />Introduction <br />On December 16 and 17, 1993, ROY F WESTON, INC (WESTON(&) performed groundwater <br />sampling of six monitor wells at the former Mayor Mart site located at 1235 East Alpine Avenue <br />in Stockton, California The field work was part of a quarterly program conducted to monitor <br />groundwater quality in the vicinity of former underground storage tanks <br />Water Level Measurement and Monitor Well Purge <br />Upon arrival at the site, measurements of standing water levels and total well depth were taken <br />in all wells using an electronic well sounding device Calculations to determine the groundwater <br />levels relative to Mean Sea Level (MSL) were made and the results are presented in Table A-1 <br />TABLE A-1 <br />Water Level Elevations <br />December 17, 1993 <br />Well Location <br />Depth to Water (feet) <br />Top of Casing (feet), <br />Water Elevation (feet)' <br />MW -1 <br />74 15 <br />2093 <br />-53 22 <br />MW -2 <br />74 16 <br />2095 <br />-5321 <br />MW -3 <br />73 77 <br />2049 <br />-53 28 <br />MW -4 <br />7259 <br />1946 <br />-53 13 <br />MW -5 <br />7252 <br />19 43 <br />-5309 <br />MW -6 <br />71 41 <br />18 22 <br />-53 19 <br />I Top of Casing Elevations were establvhed by the July 2, 1993 resurvey of the well heads and are relative to <br />' MSL <br />2 Water elevations are relative to MSL <br />The water level and total depth measurements were used to calculate the required purge volumes <br />for the monitor wells Additionally, prior to purging and sampling, a clear teflon bailer was <br />lowered dust to the top of the water column in each of the wells and retneved for visual <br />' inspection to evaluate the presence of floating product on groundwater There was no indication <br />of floating product in any of the wells The clear teflon bailer was then used to purge the well <br />of approximately three casing volumes Monitor well purge data is summarized in Table A-2 <br />Srk1RPr51ARE64QTR WP A - 1 01(27!94 <br />