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• DDJOacy Well Installation Work Plan 2.2 Drilling Methods 2.3.2 Filter pack material,bentonite seal support sand,bentonite seal, and annular space 2.2.1 The proposed monitoring well will be grout seal will be placed in accordance with drilled and installed into the Above Upper guidelines set forth in the Comprehensive Field Horizon, which is estimated to be from 25 to 50 Work Plan. feet below ground surface in the northern portion of the DDJC-Tracy facility. 2.3.3 Precise well screen placement will be determined based on observed lithology from 2.2.2 Hollow Stem Auger. One 8-to 9-inch soil cores and depth at which groundwater is diameter boring for the monitoring well will encountered. The well will be screened in the initially be drilled with 4-1/4-inch internal Above Upper Horizon aquifer, which is diameter hollow stem augers to obtain a estimated to be at a depth of approximately 20 continuous core for lithologic logging. Drilling to 30 feet below ground surface. All well and sampling will occur according to the construction details will be documented procedures outlined in the Comprehensive Field accordingly. Work Plan. Prior to monitoring well construction, the boring will be reamed with 2.4 Well Development larger diameter augers to provide sufficient annular space for construction. The monitoring well will be developed after well casing installation.Well development 2.2.3 Lithologic logging of the soils obtained procedures will follow those outlined in the from the borehole will be documented in Comprehensive Field Work Plan. accordance with the procedures outlined in the Comprehensive Field Work Plan. 2.5 Location Surveying 2.3 Monitoring Well Construction Coordinates and elevation surveying of the newly installed monitoring well will be 2.3.1 Monitoring well construction procedures performed in accordance with the will be performed in accordance with those Comprehensive Field Work Plan. outlined in the Comprehensive Field Work Plan. The proposed monitoring well location is shown in Figure 2-1. A schematic diagram of a typical 2.6 Investigation Derived Wastes monitoring well design is included as Attachment 1 to this work plan. Monitoring well Investigation derived wastes (IDW), consisting construction details for proposed well of soil cuttings and groundwater purged during LM174AU are presented below. well development, will be managed in accordance with procedures described in the • Well casing will be 6-inch nominal diameter DDRW-Sharpe/Fracy Waste Management Plan Schedule 40 blank PVC casing from 0 to 20 (August 1996). feet(6-inch diameter casing and screen will be installed for possible future conversion to 2.7 Groundwater Sampling and a groundwater extraction well, if needed). AnalVsis • The well screen will be 6-inch nominal Groundwater samples will be collected diameter stainless steel slot screen, 0.020 following installation of LM174AU as part of inch slot size from approximately 20 feet to the Well Monitoring Program. Samples will be 40 feet bgs. analyzed for volatile organic compounds and • The wellhead will be constructed with a pesticides by U.S. EPA Methods SW8260 and flush-mounted, traffic rated, utility box. SW8081, respectively. Groundwater sampling and analysis activities will be performed using RFWI.DOC 3 December 1999