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SENT BY:9163622318-Sacra. , CA ; 4-17- 0 ; 1:32PM ;RADIAN INTERNATIONAL 2094683433;# 2/ 9 DDJC-Tracy EW005 Abandonment Work Plan 1.0 INTRODUCTION feet.There is a 5-foot collar with blank casing 40 to 45 feet from the base of the vault.The The purpose of this work plan is to surnmarize total depth of the borehole drilled for the well the activities necessary to perform the gs. Attachment 1 to this work plan abandonment of extraction well(EW)005AU, truction log for EW005AU. located along the northern boundary of the - Defense Distribution San Joaquin(DDJC)Tracy 1.2 1999 EW005 Inspection Site(Figure 1-1;Note:The location of EW005AUA is shown on the figure;this well 1.2.1 On 12 October 1999,representatives replaced EW005AU,and was installed from Radian and Gregg Drilling visited the site approximately 10 feet from the original well). to determine the best approach to abandon the The work performed will be conducted in well. During this visit,the well was sounded accordance with the general procedures, with a weighted tape to determine the actual specifications,and requirements set forth in the depth of the well.The attempt to reach the Comprehensive Field Work Plan—Volume I of bottom of the well was unsuccessful, with the 2-SharpelTracy Sites, California(Radian treasuring tape stopping at a depth of International, 1998a).Also included in this approximately 37 feet bgs, EW003AU 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 EWOO5AU.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 be necessary to place steel plating over the canal Attempt to allow drill rig access.The well cannot be accessed for overdrilling unless the security 1.1.1 Abandonment of EW005AU was . fence along the north boundary of the depot attempted by Radian International (Radian)and property is temporarily removed during the Gregg Drilling in April of 1998,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 EW00SAIJ documented in a Radian memorandum dated 1 was attempted on 18 November 1999 to 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 4- camera would not fit in the well with the pump foot by 4-fool vault,constructed below ground and drop pipe.A camera of smaller diameter surface. Well construction consisted of a 6-inch that could be inserted into the well for the video diameter PVC-cased well to a depth of 20 feet survey was not available.Therefore,no video below ground surface(bgs).A 6-inch diameter survey was completed. stainless steel screen is in place from 20 to 40 131W005_AbMdWmmt l December 1999