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DDJC-Trac EW005 Abandonment Work Plan • Coordination with SJCEHD to obtain a as described in the Comprehensive Field Work permit for well abandonment; Plan; examples of activities include (with Comprehensive Field Work Plan section • Clearance of overhead utility hazards at the numbers): work area by DDJC-Tracy facilities staff; • Hollow-Stem Auger Drilling(4.2); • Saw-cutting of the concrete drainage canal adjacent to the well, if the drilling • Initial Abandonment Activities, Grout subcontractor deems necessary; Composition/Placement (8.3/8.4/8.5); and • Placement of steel plates over the drainage • Decontamination (9.3). canal for rig access to the well; 2.4 Investigation-Derived Waste • Temporary removal of security fence to Management allow rig access; 2.4.1 Investigation-derived waste(IDW) • Overdrilling to remove the casing, well generated during the abandonment efforts will construction materials, and well pump and be managed as follows: piping; hollow-stem augers will be used to drill out the existing 6-inch diameter well • Containerizing the solid IDW,including casing and screen. The size of the augers cuttings generated through overdrilling will be at least 2 inches larger in diameter activities,into 55-gallon drums; than the inside diameter of the well casing. The entire depth of the initial well borehole • Placement of groundwater removed during (i.e.,prior to well construction) will be grouting of the well into 55-gallon drums drilled out; (for later disposal at the on-depot groundwater treatment plant); • Removal of the well casing from the inside of the augers and placement on plastic • Sampling and analysis of solid IDW; sheeting in a designated area for later inspection and disposal; • Preparation and submittal of an IDW report with disposal recommendations; and • Rotating the augers at the bottom of the borehole to remove all well construction • Transportation and disposal of IDW. debris and assure a satisfactory seal between the new grout and the borehole wall; 2.4.2 Field activities related to IDW management will be performed using procedures • Grouting of the borehole from the bottom described in Section 10.0 of the Comprehensive upward through the augers via tremie pipe; Field Work Plan. IDW will also be managed in the tremie pipe will be raised slowly as accordance with procedures described in the grout is placed inside the auger flights. The DDRW-Sharpe/Tracy Waste Management Plan auger flights will be raised from the (Radian International, 1998c). borehole as the grout is placed; and 3.0 REFERENCES • Replacement and repair of concrete in the drainage canal and restoration to California Department of Water Resources, surrounding conditions. 1991. California Water Well Standards. Bulletin 74-90. 2.3.3 Well abandonment activities by overdrilling will be performed using procedures ABNDNMNT.DOC 4 February 2000