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CAMBRIA <br /> STANDARD WELL DESTRUCTION FIELD PROCEDURES <br /> This document presents standard field methods for destroying groundwater monitoring wells. <br /> The objective of well destruction is to destroy wells in a manner that is protective of potential <br /> water resources. The two procedures most commonly used are pressure grouting and drilling out <br /> the well. These procedures are designed to comply with Federal, State and local regulatory <br /> guidelines. Specific field procedures are summarized below. <br /> Pressure Grouting <br /> Pressure grouting consists of injecting neat Portland cement through a tremie pipe under pressure <br /> to the bottom of the well. The cement is composed of about five gallons of water to a 94 lb. sack <br /> of Portland I/H Cement. Once the well casing is full of grout, it remains pressurized by applying <br /> pressure with a grout pump. The well casing can also be pressurized by extending the well casing <br /> to the appropriate height and filling it with grout. In either case, the additional pressure allows <br /> the grout to be forced into the sand pack. After grouting the sand pack and casing,the well vault <br /> is removed and the area resurfaced or backfilled as required. <br /> Well Drill Out <br /> When well drill out is required, the well location is cleared for subsurface utilities and a hollow- <br /> stem auger drilling rig is used to drill out the well casing and filter pack materials. First, drill <br /> rods are dropped down the well and used to guide the augers as they drill out the well. Once the <br /> well is drilled out, the boring is filled with Portland cement injected through the augers or a <br /> tremie pipe under pressure to the bottom of the boring. The well vault is removed and the area <br /> resurfaced or backfilled as required. <br /> Well Destruction SOP <br />