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FIELD REPORT <br /> �j 1992 FOURTH QUARTER WATER SAMPLING <br />' FORMER MAJOR MART FACILITY <br /> STOCKTON, CALIFORNIA <br />' Introduction <br /> On October 15 and 19, 1992, ROY F WESTON, INC (WESTON) conducted a groundwater <br />' sampling program of six monitor wells located at the former Mayor Mart site located at 1235 <br /> East Alpine Avenue in Stockton, California The field work was conducted as a part of a <br />' quarterly program to monitor groundwater quality in the vicinity of former underground storage <br /> tanks <br />' Water Level Measurement and Monitor Well Purae <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 /> October 15, 1992 <br />' Well Location Depth to Water (feet) Top of Casing Elevation' Water Elevation' <br /> MW-1 8540 2093 -6447 <br /> IMW-2 8540 2090 -6450 <br /> MW-3 8505 2052 -6453 <br />' MW-4 83 95 1942 -6453 <br /> MW-5 9395 19 38 -6457 <br />' MW-6 8270 1815 -6455 <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 /> I volumes for the monitor wells Prior to purging and sampling, a clear teflon bailer was lowered <br /> dust 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 2-inch wells of <br /> at least three well volumes Monitor well purge data 1s summarized in Table A-2. <br />�, nXCIRFMAREG3QM WP A <br />