Laserfiche WebLink
STANDARD FIELD PROCEDURES FOR ABANDONING MONITORING <br /> WELLS <br /> This document presents standard field methods for abandoning ground water monitoring wells The <br /> objective of well abandonment is to destroy wells in a manner that is protective of potential water <br /> resources The two procedures most commonly used are pressure grouting and drilling out the well <br /> These procedures are designed to comply with Federal, State and local regulatory guidelines <br /> Specific field procedures are summarized below <br /> Pressure Grouting <br /> Pressure grouting consists of injecting neat Portland cement through a tremae 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 of <br /> Portland PH 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 the <br /> grout to be forced into the sand pack After grouting the sand pack and casing, the well vault is <br /> removed and the area resurfaced or backfilled as required <br /> Well Drill Out <br /> When well drill out is required, a hollow-stem auger drilling rig is used to drill out the well casing <br /> rind p ick materials First, drill rods are dropped down the well and used to guide the augers as they <br /> drill out the well Once the well is drilled out, the boring is filled with Portland cement injected <br /> through the augers or a tremae pipe under pressure to the bottom of the boring The well vault is <br /> removed and the area resurfaced or backfilled as required <br /> i <br /> Page L of 1 <br />