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' 3.0 SEQUENCE OF FIELD EVENTS 1 A chronological sequence of field events from the beginning of operations through completion of surface closure is presented in the following. 3.1 June 1 Activities - BSK personnel (two) with the drill rig and support vehicle were on site at 08:00. Halliburton personnel (five) along with the RCM® trailer and tractor, dry-grout mix truck, and support vehicles were on site at 08:00. The field supervisors from BSK and Halliburton met to discuss operational procedures and the site specific health and safety issues. The water truck on the RCM® (pump truck) was filled using the supply located on the west side of Building 5 (refer to Section 1.4). The BSK and Halliburton equipment (see photographs #2 through #5, Figure 3) were "rigged-up" over and adjacent to.MW-5. The jet sub and bit (see photograph #1, Figure 3) and drill stem were lowered to the bottom of MW-5. At approximately 09:30, the SJPHS inspector arrived on site. The first perforation was performed at approximately 64 feet as proposed in the Work Plan (Reference No. 3). ' Other perforation intervals were as proposed in the Work Plan for MW-5. The BSK project manager arrived on site after completion of the perforation at 28 feet. Due to the viscosity of the grout mix and return flow material, problems with the gravity transfer of grout from the riser casing to the containment pools were encountered. At 11:35, the perforation at the 3-foot interval was completed and the excess overflow was cleaned from the pavement surface ' and placed into the containment pools. Three containment pools were used for overflow spoil. Equipment was moved and "rigged-up" over MW-2. The jet bit and drill stem were rum inside the casing to a depth of 62 feet and the first perforation was completed at 12:00. T)n the second perforation attempt at 48 feet, the drill stem "bound-up" and the drill stem joint failed at 20 feet below the surface. Halliburton's field engineer located an overshot tool for the HP90 rod and had their machine shop in Woodland, California weld a sub to the overshot tool. The field engineer left the site and drove to Woodland to pick up the overshot tool. The well casing (MW-5) was purged of the grout with potable water from the RCM® (pump truck) to the top of the broken section of drill ' rod (approximately 20 feet below the top of the two-inch well casing). The equipment was moved to MW-1 at approximately 13:00. The jet bit and drill stem were positioned at 62 feet for the first perforation. The first perforation was completed at 62 feet with some "bind-up" of the drill stem possibly owing to the flowing sands. Some minor binding difficulties were experienced at the 54-foot interval (approximately 2 to 3 seconds). No "bind- up" difficulties were experienced from the 43-foot interval and up. Abandonment operations for MW-1 were completed at 15:20. Two small ' containment pools were used for overflow spoil. The SJPHS inspector who 4 &Associates