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DDJC-Tracy EW005 Abandonment Work Plan 1.3.2 Additional information on the well,the and comparison with extraction well pump, and its components were gathered to construction diagram details, the well will be determine the best possible approach to abandon abandoned using pressure-grouting techniques. the well. In Section 2.0 of this work plan, the Well abandonment by pressure grouting will approach to abandoning EW005AU is discussed include the following: in detail. Also,removal of the pump and components still present in the well is included • Coordination with SJCEHD to obtain well in the abandonment procedures. destruction permit approval, and notification by SCJEHD of the abandonment schedule; 2.0 PLANNED FIELD WORK SUMMARY • Pressure grouting the well from the bottom of the well to the ground surface using a 2.1 Pump and Sediment Removal tremiepipe; the well sealant material will consist of a cement/bentonite grout mixture 2.1.1 Prior to initiation of any EW005AU in accordance with California Well abandonment activities, an attempt will be made Standards -Bulletin 74-90(California to remove the pump and its components from Department of Water Resources, 1991); and the extraction well. The pump removal activities will include the following: • Removal of surface protective casing to a depth of 5 feet bgs and restoration to • Review of well construction and pump surrounding conditions. records; 2.2.2 Field activities will be performed using • Coordination with San Joaquin County procedures described in the Comprehensive Environmental Health Division (SJCEHD) Field Work Plan.Examples of activities include on date of attempted pump removal; (with Comprehensive Field Work Plan section numbers): • Attempts to remove pump by pulling drop pipe and wiring from the well with various • Regulatory Issues and Permits (8.1); downhole retrieval tools, as needed; and • Initial Abandonment Activities, Grout • If pump is removed, sounding the extraction Composition/Placement(8.3/8.4/8.5); and well to verify there are no other obstructions above the bottom of the casing. • Decontamination(9.3). 2.1.2 If more than 5 feet of silt remains in the 2.3 Well Abandonment by bottom of the well after pump removal, the well Overdri Iling will be surged and bailed in an attempt to remove sediments in the well. If surging the well 2.3.1 If EW005AU pump removal efforts are to remove sediment is unsuccessful, the well unsuccessful, or the well screen is damaged, the will then be abandoned by overdrilling the entire well will be abandoned by overdrilling in well casing,as described in Section 2.3. compliance with requirements established by the California Well Standards -Bulletin 74-90 and 2.2 Well Abandonment by abandonment procedures described in the Pressure Grouting Comprehensive Field Work Plan. 2.2.1 If the pump removal effort is successful, 2.3.2 Well abandonment activities by and the total depth of the extraction well is overdrilling will include the following: verified through sounding of the well bottom ABNDNMNT.DOC 3 February 2000