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DDJC-Tracy EW005 Abandonment Work Plan 1.0 INTRODUCTION 1 to this work plan is a well construction log for EW005AU. The purpose of this work plan is to summarize the activities necessary to perform the 1.2 1999 EW005 Inspection abandonment of extraction well (EW)005AU, located along the northern boundary of the 1.2.1 On 12 October 1999,representatives Defense Distribution San Joaquin(DDJC)- from Radian and Gregg Drilling visited the site Tracy Site(Figure 1-1). The work performed to determine the best approach to abandon the will be conducted in accordance with the well. During this visit,the well was sounded general procedures, specifications, and with a weighted tape to determine the actual requirements set forth in the DDJC- depth of the well. The attempt to reach the Sharpe/Tracy Comprehensive Field Work Plan bottom of the well was unsuccessful, with the — Volume 1 of 2, Version 2.0(Radian measuring tape stopping at a depth of International, 1998a). Also included in this approximately 37 feet bgs. EW005AU abandonment work plan is a summary of a previous abandonment attempt, a 1.2.2 During the 12 October visit to the site, recent inspection, and an attempted video survey several items that raise logistical concerns were of EW005AU. Currently planned abandonment noted. Overhead utilities are located directly activities are discussed in Section 2.0. These above the former extraction well. The well is include pump removal and well abandonment by also located adjacent to the concrete drainage pressure grouting;if pump removal is not canal that runs along the northern boundary of possible, abandonment will be accomplished by the DDJC-Tracy facility. The canal wall is overdrilling and grouting. Both of these approximately 4 inches away from the well abandonment options are described below. casing,making it difficult to overdrill the well without causing damage to the concrete. It will 1.1 1998 EW005 Abandonment also be necessary to place steel plating over the Attempt canal to allow drill rig access. The well cannot be accessed for pump removal and overdrilling 1.1.1 Abandonment of EW005AU was unless the security fence along the north attempted by Radian International(Radian) and boundary of the depot property is temporarily Gregg Drilling in April of 1998. During the removed during the abandonment effort. abandonment effort, an unsuccessful attempt was made to remove the pump from the well. It 1.3 1999 EW005 Video Survey was concluded that there may have been well- Attempt casing collapse because the pump could not be retrieved. A summary of these activities is 1.3.1 A downhole video survey of EW005AU documented in a Radian memorandum dated was attempted on 18 November 1999 to 1 May 1998 (Radian International, 1998b). determine the position of the pump in the well and the condition of the well casing. The video 1.1.2 Review of well construction records for survey,however, was unsuccessful because the EW005 indicated the well was located in a camera would not fit in the well with the pump 4-foot by 4-foot vault, constructed below ground and drop pipe. A smaller camera was not surface(bgs). Well construction consisted of a available to insert into the well for the video 6-inch diameter PVC-cased well to a depth of 20 survey; therefore, no video survey was feet bgs. A 6-inch diameter stainless steel screen completed. is in place from 20 to 40 feet. There is a 5-foot collar with blank casing 40 to 45 feet from the base of the vault. The total depth of the borehole drilled for the well was 51 feet bgs. Attachment ABNDNMNT.DOC I February 2000