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SENT BY:9163622318-Sacra. , CA ; 4-17- 0 : 1:34PM RADIAN INTERNATIONAL- 2094683433:# 4/ 9 DDJC-Tracy 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 work area of overhead utility numbers): hazards through DDJC-Tracy facilities staff; • Hollow-Stem Auger Drilling(4.2); • Saw-cutting of concrete drainage canal adjacent to the well,if the drilling • Initial Abandonment Activities,Grout subcontractor deers 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(ID)of the well casing.The entire depth of the initial well • Placement of groundwater removed during borehole(i.e.,prior to well construction) grouting of the well into 55-gallon drums will be 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 • Rotate 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 trentie,pipe will be raised slowly as accordance with procedures described in the grout is placed inside the auger flights.The DDRW-Sharpe/Pracy 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 he performed using procedures F.W005_Abandunm t 3 December 1999