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CVATC A S S O C I A T E S I N C . ATC has conducted groundwater monitoring at the site beginning in June 1999 and continuing through March 2003. Laboratory analytical data indicates that TPHg and BTEX have been consistently detected at low levels in well MW-1; that 1,2-dichloroethane (1,2-DCA) has been detected in wells MW-1, MW-2, and MW-3 during the fourth quarter 2001 sampling event, and that 1,2-DCA was detected in wells MW-I and MW-3 during the first quarter 2003 sampling event. The EHD issued a letter to Ms. Lolly Bozzano on September 11, 2003 and concluded that due to the continuing presence of TPHg, and BTEX in groundwater samples collected from monitoring well MW-I and the presence of 1,2-DCA in groundwater samples collected from wells MW-1 and MW-3, further investigation of the site is warranted. Additionally, the EHD reviewed the Closure Report for the site prepared in 2001 by ATC and discussed the contents with the RWQCB. The RWQCB felt that the mass of contamination remaining in the soil was higher than the mass calculated in the report. They also thought that the feasibility of vapor extraction should be evaluated to remediate the contamination remaining in the soil that could continue to be a source of contaminant impact to groundwater. Based on their review, the EHD requested a work plan to investigate the lateral and vertical extent of the contamination at the site and to evaluate remedial alternatives for cleanup of the site. ATC's Workplan for Additional Subsurface Investigation at Three Palms Grocery located at 6732 East Highway 88, Stockton, California was approved by EHD on March 11, 2004. On March 24, 25, and 26, and May 20, 2004, three soil borings (GPI, GP2 and GP3) were advanced at the site in the vicinity of the former USTs to evaluate the lateral extent of petroleum affected soil and groundwater. On March 29 and April 2, 2004, two CPT borings (CPTI and CPT2) were advanced at the site in the vicinity of the former USTs to evaluate the vertical extent of petroleum affected soil and groundwater. The GP and CPT borings are discussed in ATC's Supplemental Subsurface Investigation at Three Palms Grocery, dated October 18, 2004. SCOPE OF WORK Planning and Permits ATC has prepared the drilling permit applications for the proposed subsurface investigation. The permits and associated fees are attached. ATC will also schedule field personnel and equipment, notify Underground Services Alert to locate underground utilities as required, and perform other necessary field preparation and job start-up activities. w:\14885\workplaat\wkpin2OO5.doc 3