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5� <br /> CLEA"R' W_ xATER <br /> C R o u r <br /> Enveronmenfa! Services <br /> at 25 feet and 35 feet bgs MTBE was not detected by EPA method 8260 in any of the soil <br /> samples analyzed Groundwater concentrations of TPHg and BTEX were detected in borings <br /> SB-9, MW-5B, MW-7 and MW-8 The highest groundwater concentration of TPHg (9,700 <br /> µg/L) was detected in MW-5B MTBE was not detected by EPA method 8260 in any of the <br /> groundwater samples analyzed <br /> A dual-phase test well and air sparge point was installed at the site in February 2002 Remedial <br /> feasibility testing at the site was conducted during the week of March 10, 2002 The Well <br /> Installation and Feasibility Testing Report was submitted on May 9, 2002 From data collected <br /> during these activities, Clearwater developed and submitted a Corrective Action Plan dated <br /> November 20, 2002 to the SJC/EHD <br /> Beginning in June, 2000 groundwater in all monitoring wells has been sampled on a calendar <br /> quarterly basis These sampling events took place on June 6, 2000, August 28, 2000, November <br /> 14, 2000, February 13, 2001, May 30, 2001, August 22, 2001, October 11, 2001, February 14, <br /> 2002, May 10, 2002, September 30, 2002, December 4, 2002, March 5, 2003, and June 5, 2003 <br /> Reports documenting these activities have been previously transmitted to the SJC/EHD by <br /> Clearwater <br /> OBJECTIVES <br /> In continuance of quarterly groundwater monitoring activities, the objectives of this current <br /> project were to gather groundwater samples from all monitoring wells at the site and to analyze <br /> the groundwater samples for hydrocarbon contamination In addition, an MNA study was <br /> continued this quarter, and chemical parameters and groundwater samples were collected These <br /> data will serve for preliminary assessment of site suitability (discussed below) and as baseline <br /> GROUNDWATER MONITORING AND SAMPLING ACTIVITIES <br /> Groundwater monitoring and sampling activities were conducted on December 16, 2003 <br /> . Groundwater elevation data were obtained from each of the monitoring wells utilizing an <br /> electronic water level indicator The water level indicator was thoroughly washed in an <br /> ZB178C/4Q03 Monitoring Rpt 4 January 29,2004 <br />