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• the integrity of well MW-20 does not appear to have been compromised by allowing the string of augers to remain in the borehole Well Development and Sampling Stratus retained Woodward Drilling Company to complete well development activities Wells MW-16 through MW-18 were developed on April 25, 2006 The wells were developed by surging and bailing Approximately 32 gallons (MW-16), 12 gallons (MW-17), and 14 gallons (MW-18) of groundwater were removed during well development activities Woodward attempted to utilize pumping during well development, however insufficient water in the wells and very low recharge rates made pumping impractical Insufficient groundwater was present in the well MW-19 and MW-20 casing to enable development Stratus returned to the site on May 10, 2006, to purge and sample the newly installed wells Field data sheets generated by Stratus during the well development and groundwater sampling events are presented in Appendix D Waste Management Drill cuttings, drilling mud, and wastewater generated during the drilling activities were placed in a roll-off steel bin and stored on-site pending disposal Wastewater generated during well development activities was containerized in 55-gallon steel drums and stored at the site pending disposal A sample of the soil cuttings was submitted for chemical analysis to determine the appropriate disposal facility for the material Dillard Trucking Company (Dillard) of Byron, California, transported the material stored in each bin to Republic Services Landfill in Livermore, California, for disposal Dillard transported the drummed wastewater to Instrat, Inc in Rio Vista, California, for disposal Surveying Morrow Surveying, Inc of West Sacramento, California, surveyed the elevations and locations of each newly completed monitoring well, and the location of soil borings B-44 through B-48, in February 2006 Monitoring well elevations were established to the nearest 0 01 vertical feet, and tied to the previous survey completed at the site Latitudes and longitudes of all wells were established using the Global Positioning System (GPS) California State Plane Coordinates, latitudes and longitudes of the wells, and well elevations are included on the surveyor's map presented in Appendix E Well survey data was forwarded to the California State Water Resources Control Board for inclusion in the Geotracker database Analytical Methods Soil and groundwater samples were forwarded to Sequoia Analytical, Inc , a California state- certified laboratory (ELAP #1210) for chemical analysis under strict chain-of-custody procedures Soil and groundwater samples were analyzed for GRO, benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary butyl ether (MTBE), ethyl tertiary butyl ether (ETBE), di-isopropyl ether (DIPS), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), ethanol, 1,2-dichloroethane (1,2-DCA), and dibromoethane (EDB) using USEPA Method 8260B Soil analytical results are presented in Table 3 and groundwater analytical K 1Bp Arco for UK54610p1Repottsl6 LOG assessment rpt do scm update doc Page 6J'TKAW5