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i <br /> FIELD REPORT <br /> 1993 SECOND QUARTER WATER SAMPLING <br /> FORMER MAJOR MART FACILITY <br />' STOCKTON, CALIFORNIA. <br />' Introduction <br /> On June 17 and 18, and July 2, 1993, ROY F WESTON, INC (WESTON) conducted a <br />' groundwater sampling program of six monitor wells at the former Mayor Mart site located at <br /> 1235 East Alpine Avenue in Stockton, California The field work was conducted as a part of <br /> a quarterly program to monitor groundwater quality in the vicinity of former underground <br />' storage tanks <br /> Water Level Measurement and Monitor Well Purge <br />' Upon arrival at the site, it was discovered that during the site restoration activities of the recent <br /> remedial excavation work, the well heads of monitor wells MW-1 and MW-3 had been covered <br /> over with fill material and that MW-2 was partially filled with gravel. MW-1 and MW-3 were <br />' located using a pipe and cable locator, uncovered and inspected Because the two wells were <br /> clean internally and did not appear to be damaged, sampling proceeded on June 17 and 18 for <br /> all wells except MW-2 Water levels were measured in the five wells at that time only for the <br /> purpose of determining purge volumes Various methods were then considered to renovate <br /> MW-2 The gravel was eventually removed using an air lift mechanism and the well was <br /> redeveloped Sampling of MW-2 took place on July 2, 1993 Also, because the casing of, <br /> MW-2 may have been disturbed, the vertical elevation of all wells onsite was re-surveyed to - <br /> establish a current baseline for water level measurements A set of water level measurements <br /> from all wells was taken at the time of sampling MW-2 (July 2) and that data was used to <br /> represent water levels for gradient and flow direction for the second quarter monitoring event <br />' Calculations to determine the groundwater levels relative to Mean Sea Level (MSL) were made <br /> and the results are presented Table A-1 <br />' TABLE A-1 <br /> Water Level Elevations <br /> Feet Above MSL <br />' July 2, 1993 <br />' Well Location Depth to Water (feet) Top of Casing MSL' Water Elevation <br /> MW-1 7456 2093 -53 63 <br />' MW-2 7458 2095 -53 63 <br /> MW-3 74 18 2049 -53 69 <br />' MW-4 7340 1946 -5394 <br /> MW-5 73 45 1943 -5402 <br /> MW-6 71 87 18 22 L -53 65 <br /> 1 Top of Casing Elevations at those established by the July 2, 1993 resurvey of the well heads <br /> M\RPTSWREC�QTR WP <br /> A <br />