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URS Ms Margaret Lagorio, Supervising REHS Page 4 of 7 . San Joaquin County Environmental Health Department February 16, 2005 conductivity of the development water was measured and recorded periodically during the development process Purge water generated during well development was pumped into a Blame Tech truck-mounted water tank The water was then transported to the Blaine Tech holding facility in Roseville, California Dillard Environmental Services then transported the water to the Altamont Landfill and Disposal Facility in Altamont, California, for disposal Well development and purge field sheets are included in Attachment ' C On December 13, 2004, groundwater samples were collected by Blaine Tech from wells MW-4 and MW-5 Groundwater samples were analyzed for GRO, BTEX, and fuel oxygenates by EPA Method 8260B On December 14, 2004,Morrow Surveying of West Sacramento, California, surveyed the monitoring well locations with respect to both latitude and longitude and northing and easting positions The top-of- casing elevations were surveyed with respect to mean sea level (msl) Well survey data are presented in Attachment D ' Soil and Groundwater Analytical Results Soil sample analytical results reported GRO, BTEX, and fuel oxygenates as below laboratory detection limits in all samples analyzed Soil analytical data are summarized in Tables 1 and 2 Laboratory analytical reports and chain-of-custody documentation are included in Attachment E Grab groundwater sample analytical results reported GRO, BTEX, and fuel oxygenates as below laboratory detection limits Grab groundwater analytical data are summarized on Figures 2 and 3, and in Tables 3 and 4 Laboratory analytical reports and chain-of-custody documentation are included in Attachment E Groundwater sample analytical results collected from deep well MW-5 reported toluene at a 1 concentration of 0 55 micrograms per liter(µg/L) and total xylenes at 0 84 µg/L GRO and all other fuel oxygenates (including 1,2-DCA) were reported as below laboratory detection limits Analytical results for monitoring well MW-4 reported GRO, BTEX, and all fuel oxygenates (including 1,2-DCA) as below laboratory detection limits Groundwater analytical data are summarized on Figures 2 and 3, and in Tables 5 and 6 Groundwater laboratory analytical reports are included in Attachment E ' Equipment Decontamination and Soil Cutting and Wastewater Disposal Soil cuttings and decontamination water generated during drilling activities were placed in 55-gallon Department of Transportation (DOT) approved steel drums and stored on site pending disposal A composite soil cutting sample was collected from the drums in a 6-inch long, 2-inch-diameter,brass liner with the ends sealed with Teflon°tape and plastic end caps, labeled, and placed in a cooler on ice for delivery to Sequoia in Morgan Hill, California, under chain of custody The sample was submitted and analyzed for GRO by EPA Method 8015B (preparation EPA Method 5030), BTEX by EPA Method K lwprocessV5 BP ARCO\0076012004 Assessment1760 additional assessment report 04 doo