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SOP-010 Standard Operating Procedure Well Construction Page 3 of 11 Revision No. 0 March 2020 Sharpe Army Depot Annular Space The space between any of the following: • Concentric drill pipes • An inner drill pipe and outer drive casing • Drill pipe or drive casing and the borehole wall • Well screen or casing and the borehole wall Filter Pack Granular filter material (sand, gravel, etc.) placed in the annular space between the well screen and the borehole to increase the effective diameter of the well and prevent fine-grained material from entering the well. Well Screen A perforated, wire-wound, continuous wrap, or slotted casing segment used in a well to maximize the entry of water from the producing zone and to minimize the entrance of sand. Tremie A tubular device or pipe used to place grout, bentonite, or filter pack in the annular space. 4.0 Procedures This section contains procedures for installing monitoring or extraction wells using mud rotary, air rotary, air rotary casing hammer, dual tube percussion, or hollow-stem auger drilling techniques. 4.1 Planning Site-specific factors must be considered in the selection of well construction and completion materials, specification of well designs, and well-drilling methods. These factors will be incorporated into project planning activities and the compilation of specific project work plans: • Objectives of the monitoring well or extraction well • Specific location of the well to be installed • Zone or depth well is to be installed • Drilling method(s) to be used • Well construction materials to be used • Specification of well design(s) including Well Construction Diagrams (See Work Plan) • Additional procedures or requirements beyond this SOP 4.2 Preparation 4.2.1 Ensure Clearance Before mobilization of a rig to the well site, ensure that the monitoring well location has been appropriately cleared of all underground utilities, buried objects, and drill permits have been issued per