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s <br /> r` <br /> Field Report <br /> ry Groundwater Sampling <br /> East Bay Municipal Utility District <br /> Stockton Center, Stockton, California <br /> On March 5, 1991, 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. The field work was conducted In an effort to characterize the <br /> presence of petroleum compounds in groundwater. <br /> Wafer samples were taken from the seven monitoring wells located on the site. The wells <br /> are identified as MWA, MW-2,and MW-3(previously existing)and MW-4, MW-5, MW-6, <br /> and MW-7 (installed by WESTON in February 1991). <br /> Water samples collected were identified with the number of the wells from which they <br /> were taken. A sampling order was created prior to purging and sampling the wells based <br /> upon prior sampling of MW-1, MW-2 and MW-3. The sampling order is as follows: <br /> 1) MW-2 4) MW-5 7) MWA <br /> 2 MW-3 5) MW-6 8) MW-8 (duplicate of MW-1) <br /> 3) MWA 6) MW-7 9) MW-9 (equipment decontamination blank) <br /> Prior to purging each well, measurements of total well depth and depth to water were <br /> takers. From these measurements, the standing water volume within the well casing was <br /> calculated. A teflon hand bailer was used to purge each two inch well of at least three <br /> well volumes. Physical parameters of pH, electrical conductivity and temperature were <br /> collected from the purge water. This information is presented in Table A-3. A clear teflon <br /> bailer was then used to collect the water samples. <br /> Field Water Quality Measurements <br /> End of Purge Values <br /> Temperature Conductivity <br /> Welll5ample p ('F) (umhos) <br /> MW- 7.1 59.2 1311 <br /> 1 <br /> MW-2 7.4 65.7 1220 <br /> 7.4 60.0 1064 <br /> MW-3 <br /> MW-4 7.6 63.2 1549 <br /> 7.5 59.9 1273 <br /> MW-5 <br /> MW-6 7.6 59.6 1356 <br /> 7.5 60.0 1298 <br /> A -7 <br />