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• Well Development and Sampling Stratus developed wells MW-10, MW-12, 1\4W-13, and MW-15 on June 16, 2004 Prior to development, a hand held interface probe was used to measure depth to groundwater in each well and check for the presence of free product Free product was not observed in any of the newly installed wells The wells were developed by surging and bailing, each of the monitoring wells bailed dry during well development Approximately 10 gallons (well MW-10), 25 gallons (well MW-12), and 2 gallons (wells MW-13 and MW-15) were removed during well development activities Stratus returned to the site on June 21 and 22, 2004, to purge and sample the newly installed wells Due to relatively slow recharge rates, the wells were purged on June 21, 2004, and sampled on June 22, 2004 The second quarter 2004 groundwater monitoring event was also completed at this time 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 field activities were placed in a roll-off steel bin and stored on-site pending disposal A sample of the drill cuttings was submitted for chemical analysis to determine the appropriate disposal facility for the material After receiving the analytical results, Dillard Trucking Company of Byron, California, transported the material stored in each bin to Republic Services Landfill in Livermore, California, for disposal Surveying Morrow Surveying, Inc of West Sacramento, California, surveyed the locations and elevations of wells MW-10 and MW-12 through MW-15 on June 8, 2004 The locations of soil borings B-39 through B-43 and MW-11 were also surveyed at this time Well elevations were established to the nearest 0 01 vertical feet and tied to the previous survey completed at the site Well elevations, latitudes, and longitudes were established using the Global Positioning System (GPS), and are included on the surveyor's report 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 (FLAP #1210 [Morgan Hill] and #2374 [Petaluma]), for chemical analysis under strict chain-of-custody procedures Soil and groundwater samples were analyzed for GRO using USEPA Method 8015B, and for benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl tertiary butyl ether (MTBE), ethyl tertiary butyl ether (ETBE), di-isopropyl ether (RIPE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), ethanol, 1,2-dichloroethane (1,2-DCA), and dibrornoethane (EDB) using USEPA Method 8260B Soil analytical results are presented in Table 1 and groundwater analytical results are presented in Table 2 Certified Analytical Reports with chain-of-custody records are presented in Appendix F Historical • groundwater analytical data is provided in Appendix G P 5Bp-Afro for UR5161OMeports\arW6100 assessment s rrL_up&le doe Page 6 5 rRA rV5