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FINAL • DDRN*arpe Well Installation Work Plan 9.2 The ten injection wells installed to 9.4 Using Figure 9-2 as a point of departure, accept flow from the Central Area Groundwater the contractor shall investigate the apparent Treatment Plant will not accept the total volume injection well problems, evaluate solutions and of effluent water(Figure 9-1). The five A Zone their relative merits, and prepare a plan injection wells are not currently in operation describing the corrective actions to be taken at because Nalco 8357 chemical (an aqueous each well. The plan shall also include an solution of polyacrylate) has been added to the estimate of implementation costs and A Zone treatment system to inhibit scaling on recommended timeline. the plant piping. Because the chemical is being added to the wastewater, the effluent does not 10.0 INVESTIGATION DERIVED meet the minimum water quality standards WASTE required for injection. All effluent from the A side of the treatment plant is currently being 10.1 Handling and Storage. Investigation- discharged to the percolation ponds located near derived waste(IDW) will be handled and the western boundary of DDRW-Sharpe. managed in accordance with the procedures Alternatives to the current chemical treatment outlined in the Comprehensive Field Work Plan. should be explored and the use of the A Zone All drill cuttings will be placed in well-marked injection wells should be re-evaluated. 55-gallon drums or other designated bins or tanks. 9.3 Five B/C Zone injection wells are currently in operation,but do not have the 10.2 Development and purge water and capacity to accept the entire volume of the B/C decontamination fluids will be stored in separate Zone effluent water.Treated water that cannot polyethylene`Baker" tanks or DOT-approved be injected is released to the percolation ponds. 55-gallon drums. Water percolating from the ponds is creating a groundwater mound in the A and B zones. The 10.3 Used personal protective equipment groundwater mound may be affecting the (PPE) will be rinsed with potable water,double capture zones of wells in the Central and North bagged, and placed in on-site dumpsters. Balloon Areas, and is one possible cause for the 10.4 Container labels will be permanent, non- reduced capacity of the B Zone injection wells. fading, and weatherproof, and will include the This lack of performance is due to one or more following information: other conditions,including scaling,low hydraulic conductivity, and mechanical • Project file; problems. Scaling, if present,may be caused,or increased,by A Zone water that is being • Well or boring identification; injected into B/C Zone injection wells. a Facility; Available design drawings indicated that effluent from extraction well CAB-1 is being • Date; discharged to the B/C Zone injection wells. . Contents (soil or liquid); During this field effort,all available data sources will be reviewed to determine why the Depth where soil was obtained (if B/C wells are not performing and recommend applicable); and corrective actions to improve management of all treated effluent produced by the Central Area Whether or not the soil was saturated or Treatment Plant- Figure 9-2 presents the unsaturated(if applicable). decision process that will be used to recommend appropriate corrective actions. 10.5 All solid or liquid containers will be temporarily stored in the designated holding S-SSWP.DOC 13 September 1996