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i �vv CLEARWATER G R O U P, I N C Envo ronmen tat Seruces µg/L) was detected in MW-5B MTBE was not detected by EPA method 8260 in any of the groundwater samples analyzed A dual-phase test well and air sparge point was installed at the site in February 2002 Remedial feasibility testing at the site was conducted during the week of March 10, 2002 The Well Installation and Feasibility Testing Report was submitted on May 9, 2002 From data collected during these activities, Clearwater developed and submitted a Corrective Action Plan dated November 20, 2002 to the SJC/EHD Beginning in June, 2000 groundwater in all monitoring wells has been sampled on a calendar quarterly basis These sampling events took place on June 6, 2000, August 28, 2000, November 14, 2000, February 13, 2001, May 30, 2001, August 22, 2001, October 11, 2001, February 14, 2002, May 10, 2002, September 30, 2002, December 4, 2002, March 5, 2003, and June 5, 2003 Reports documenting these activities have been previously transmitted to the SJC/EHD by Clearwater OBJECTIVES In continuance of quarterly groundwater monitoring activities, the objectives of this current project were to determine the concentration and distribution of hydrocarbon contamination in groundwater at the site GROUNDWATER MONITORING AND SAMPLING ACTIVITIES Groundwater monitoring and sampling activities were conducted on March 16, 2004 Groundwater elevation data were obtained from each of the monitoring wells utilizing an electronic water level indicator The water level indicator was thoroughly washed in an Alconox® soap bath and double rinsed with clean tap water prior to placement in each well to prevent possible water quality influence from exterior sources, and to prevent cross contamination Groundwater elevations were derived and are tied to previously established well surface elevation data (Tables 1 and IA) ZB178C/1stQtr2004 Monitoring Rpt 4 April 15,2004