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' I <br /> Appendix A <br /> perforated interval. After setting the filter pack a one to two foot thick bentonite plug is set <br /> above the filter pack to prevent,grout from infiltrating into the filter pack. A regulatory <br /> approved annular filling material is used to fill the annulus from the bentonite plug to <br /> within 10 feet the surface (if the well depth and screen interval allow). The remaining nine <br /> feet of annulus is filled with either neat cement, cement with five percent (by volume) <br /> bentonite or sand-cement grout. The annular filling material is placed by a method <br /> approved by the regulatory agency overseeing the site. The remaining foot of the well is <br /> completed using a traffic-rated vault is installed around each wellhead for wells located in <br /> parking lots or driveways, while'�steel (or other material) "stovepipes" are usually set over <br /> wellheads in landscaped areas. A traffic-rated vault it is typically set 112-inch above grade <br /> to minimize surface water from entering the vault. In areas that may be plowed for snow <br /> removal the vault is set flush with the surface to prevent damage to the vault by a snow <br /> plow. <br /> In some cases multiple strings of casing will be run in the boring. This is known as a k <br /> nested, dual, or multiple completion. These types of completions are performed similar <br /> to the single completions with the exception that bentonite is placed between the screened <br /> intervals which isolates the intervals. <br /> I <br /> t <br /> k <br />