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{ <br /> i <br /> FIELD REPORT <br /> GROUNDWATER SAMPLING <br /> EAST BAY MUNICIPAL UTILITY DISTRICT <br /> STOCKTONi CENTER, STOCKTON, CALIFORNIA <br /> E <br /> On July 2, 1992, Roy F. Weston; Inc. (WESTON) conducted a groundwater sampling program <br /> at the East Bay Municipal Utility District (EBMUD) Stockton Center facility in Stockton, <br /> California. The field work was conducted in an effort to characterize the presence of petroleum <br /> compounds in groundwater. <br /> Water samples were collected from five of the seven monitoring wells (MW-1, MW-2, MW-3, <br /> MW-4, MW-5, MW-6 and MW-7) located on the site. Two wells (MW-5 and MW-6) were not <br />{- sampled because of road tar found in and around the well casings which may affect the <br />{ representativeness of the groundwater samples. The facility storage yard had recently been <br /> I repaved and tar had seeped into the christy boxes of the two wells. <br /> r <br /> Water samples collected were identified with the number of the well from which they were <br /> collected. The sampling order was as follows: <br /> MW-1 } <br />' <br /> MW-8 (duplicate of MW-1) <br /> MW-9 (equipment decontamination blank) <br /> MW-7 <br /> MW-4 <br /> MW-3 <br /> MW-2 <br /> MW-5 (not sampled) <br /> MW-6 (not sampled) <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. C <br /> -A teflon hand bailer was used to purge each two inch well of at least three well volumes. <br /> Physical parameters of pH, electrical conductivity and temperature were collected from the purge <br /> water. The groundwater physical!;parameters are presented in Table A-1. A clear teflon bailer " <br /> was then used to collect the water. samples. <br /> I RPTVFBMk1DRPT.WP O&MI93 y <br />