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3.5 GROUNDWATER SAMPLING Groundwater samples were collected from injection points IP 1 A, IP 1 B, IP2A, IP2B, and IP3B on 28 September 2004 using a peristaltic pump The deeper points were gauged for depth to water with a water level meter The wells were then purged of at least 3 casing volumes of water and groundwater samples were collected Groundwater pH, temperature, and electrical conductivity were monitored during purging The samples were submitted to a state-certified laboratory for analysis The groundwater monitoring and sampling procedures are described in Appendix D Field data recorded during sampling are presented in Appendix F A groundwater sample was not collected from injection point IP3A on 28 September 2004 because the mjection point was dry IP3A was subsequently sampled on 3 December 2004 as part of the fourth quarter monitoring event for the site (ETIC 2005) 3.6 SURVEYING OF INJECTION POINTS The top-of-casing elevations of newly installed injection points IP1A, IP1B, IP2A, IP2B, IP3A, and IP3B were surveyed on 1 March 2005 by Morrow Surveying of West Sacramento, California, a licensed land surveyor The benchmark used was the City of Stockton benchmark ' No 265, a chiseled cross on the sidewalk on the east side of Pershing Avenue, south of March Lane on East Bay Municipal Utilities District easement The elevations of the injection points are listed in Table 1 A copy of the survey report is provided in Appendix G �r 3,7 WASTE CONTAINMENT AND DISPOSAL ' The soil generated during drilling activities was collected in eleven 55-gallon drums and temporarily stored on the site Soil samples were collected from the drums, submitted to TestAmenca Incorporated (TestAmenca), a California state-certified laboratory in Nashville, Tennessee, composrted by the laboratory, and analyzed for TPH-g, BTEX, and total lead to characterize the soil for proper disposal The laboratory analytical report and chain-of-custody documentation are included in Appendix H The soil was removed from the site on 27 October ' 2004 and transported to an ExxonMobil-approved facility Equipment rinsate water was collected in three 55-gallon drums and temporarily stored on the site The equipment nnsate water was removed from the site on 19 January 2005 and transported to an ExxonMobil-approved facility • 0 1Pmjects1739421MASTER\WPUPR1204UPRtM doe 8