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FIELD REPORT <br /> GROUND WATER SAMPLING <br /> ' EAST BAY MUNICIPAL UTILITY DISTRICT <br /> STOCKTON CENTER, STOCKTON, CALIFORNIA <br /> ' On October 2, 1992, ROY F WESTON, INC (WESTON) conducted a groundwater sampling <br /> program at the East Bay Municipal Utility District (EBMUD) Stockton Center facility in <br /> Stockton, California Water samples were collected from seven monitor wells (MW-1, MW-2, <br /> MW-3, MW-4, MW-5, MW-6 and MW-7) located on the site The field work was conducted <br /> in an effort to characterize the presence of petroleum compounds in groundwater <br /> ' Groundwater samples were identified with the number of the well from which they were <br /> collected The monitor well sampling order was based on the previous analytical results and was <br /> ' arranged from lowest to highest concentrations as follows <br /> MW-7 <br /> ' MW-6 <br /> MW-5 <br /> MW-4 <br /> ' MW-2 <br /> MW-3 <br /> MW-1 <br /> MW-8 (duplicate of MW-1) <br /> MW-9 (equipment decontamination blank) <br /> ' Prior to purging each well, measurements of total well depth and depth to water were taken <br /> From these measurements, the standing water volume within the well casing was calculated <br /> A teflon bailer was used to purge each 2-inch well of at least three well volumes Physical <br /> ' parameters of pH, electrical conductivity and temperature were collected from the purge water <br /> The groundwater physical parameters are presented in Table A-1 A clear teflon bailer was then <br /> used to collect the water samples <br /> TABLE A-1 <br /> Groundwater Physical Parameters <br /> ' End of Purge Values <br /> Well/Sample pH Temperature(F) Conductivity <br /> ' (umhos) <br /> MW-1 6 8 707 1197 <br /> MW-2 73 705 1200 <br /> MW-3 74 71 5 1497 <br /> MW-4 74 701 1341 <br /> ' MW-5 7 1 69 3 1550 <br /> MW-6 72 705 1518 <br /> MW-7 75 68 8 1417 <br /> tMCSRPTS%HMW3RD WP A 1 11*6/92 <br />