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�t Ms. Lori Duncan Page 4 San Joaquin County Environmental Health Department January 28, 2005 On December 9, 2004, Blaine Tech Services, Inc. (Blaine Tech) developed groundwater monitoring k wells MW-7 and MW-8 by rigorously surging over the length of the screened intervals and by pumping approximately 13 gallons of water from MW-7 and 100 gallons of water from MW-8. The pH, temperature, turbidity and conductivity of the development water was measured and recorded i periodically during the development process. Well development and purge sheets are included in Attachment D. V Purge water generated during well development was pumped into a Blaine 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. I On December 16, 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 E. Groundwater Sampling and Analysis Groundwater samples were collected from wells MW-7 and MW-8 by Blaine Tech on December 13, 2004. Groundwater samples were analyzed for GRO, BTEX, and fuel oxygenates by EPA Method 8260B. Groundwater sampling field sheets are included in Attachment D. Groundwater Analytical Results Analytical results for groundwater samples collected from wells MW-7 and MW-8 reported GRO at concentrations were of 51 and 2,400 micrograms per liter (µg/L), respectively; in addition,.MtBE and 1,2-DCA reported at concentrations of 41 pg/L and 24 pg/L, respectively, in MW-7. Well MW-8 reported benzene, toluene, ethylbenzene, and xylenes (total) at concentrations of 12 µg/L, 47 pg/L, 51 µg/L,, and 260 Ag/L,respectively. All other analytical results were below laboratory detection limits. Groundwater.analytical data are presented in Tables 3 and 4. Groundwater laboratory analytical reports are included in Attachment C. 1 l Waste Storage and Disposal Soil cuttings and rinsate water generated during the drilling activities were placed in U.S. Department of Transportation (DOT) approved drums on site, pending disposal. A composite soil sample was collected from the drums and analyzed for GRO and BTEX by Methods 801518021, and total lead by EPA600017000Series Methods. Analytical results from this sample are included in Table 1. On December 16, 2004, Dillard Environmental Services transported the drums to the Republic Services Vasco Road disposal facility in Livermore, California, where they were disposed of as nonhazardous waste. Water and soil disposal documentation is included as Attachment F. 4 K:%WprocessV5 BP ARCO\0054812004 well install\Add Site Assess Rpt 04Aoc