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FIELD REPORT <br />1992 FOURTH QUARTER WATER SAMPLING <br />FORMER MAJOR MART FACILITY <br />STOCKTON, CALIFORNIA <br />Introduction <br />On December 30 and 31, 1992, ROY F. WESTON, INC (WESTON) conducted a groundwater <br />sampling program of six monitor wells at the former Major Mart site located at 1235 East <br />Alpine Avenue in Stockton, California. The field work was conducted as a part of a quarterly <br />program to monitor groundwater quality in the vicinity of former underground storage tanks <br />Water Level Measurement and Monitor Well Pur e <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 Table A-1 <br />TABLE A-1 <br />Water Level Elevations <br />Feet Above MSL <br />December 30, 1992 <br />Well Location <br />Depth to Water (feet) <br />Top of Casing Elevation` <br />Water Elevation` <br />MW -1 <br />8064 <br />2093 <br />-5971 <br />MW -2 <br />8065 <br />2090 <br />-5975 <br />MW -3 <br />8026 <br />2052 <br />-5974 <br />MW -4 <br />7914 <br />1942 <br />-5972 <br />MW -5 <br />79 17 <br />19 38 <br />-5979 <br />MW -6 <br />7786 <br />18 15 <br />-59 71 <br />1 Elevations are given in feet relative to Mean Sea Level (MSL) and are based upon measurements made from <br />top of PVC casing (TOC) <br />The water level and total depth measurements were also used to calculate the required purge <br />volumes for the monitor wells Prior to purging and sampling, a clear teflon bailer was lowered <br />just to the top of the water column in each of the wells and retrieved for visual inspection to <br />evaluate the presence of floating product on groundwater There was no indication of floating <br />product in any of the wells The clear teflon bailer was then used to purge the well of at least <br />three casing volumes Monitor well purge data is summarized in Table A-2 <br />Sl'KC1APTSAREG4QYit WP <br />A - 1 01r26193 <br />