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GUIDE TO SPECIFICATION PREPARATION FOR <br />SLURRY WALLS AND CLAY LINERS AS A COMPONENT OF <br />A COLORADO MINED LAND RECLAMATION PERMIT <br />September 2000 <br />Colorado Depamnent of Natural Resources <br />Division of Minerals and Geology <br />Michael B. Long, Director <br />H. Bruce Humphries, Minerals Program Supervisor <br />Allen Sorenson, Contact Person for this Guide <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />303/866-3567 <br />htto://mining. state.co.us/ <br />INTRODUCTION <br />It has become a common practice to reclaim gravel pits to a developed water resource Land use through <br />the installation of clay pit liners or slurry walls. The purpose of these installations is to isolate the <br />constructed water storage reservoir from the surrounding ground water system. The State Engineer's <br />Office has established design and performance standards for pit liners and slurry walls (see sections on <br />Post Construction Testing below}. It is the responsibility of the Mined Land Reclamation Board to hold <br />sufficient bond to assure that the State Engineer's performance standard can be met if the Operator of a <br />pit were to default and the state of Colorado were to reclaim the site with the forfeit bond. Under the <br />Division of Minerals and Geology policy on lined pits dated Mazch 29, 2000, Operators may choose the <br />option to bond for 100 percent installation or replacement cost of a slurry wall or pit liner or may select <br />a regulated construction option and become eligible fora 20 percent installation or replacement bond. <br />Operators are free to design and install the liner or slurry wall with relatively minimal design <br />information, specifications and quality assurance detail in the permit application under the 100 percent <br />bonding option. The assurance that the pit will be reclaimed to developed water resources is primarily <br />managed through the amount of bond held by the Board. For an Operator to be eligible for the 20 <br />percent bonding option, the Division must have a high degree of assurance that the liner or slurry wall <br />installed by the Operator will meet the State Engineer's performance standrsd. This assurance is <br />provided through inclusion of design documents, plans and specifications, and a quality assurance <br />program as enforceable components of the reclamation permit. <br />This memorandum provides an outline that is intended to guide reclamation permit Applicants that are <br />pursuing the 20 percent bonding option. Applicants that intend to bond for 100 percent of the <br />installation or replacement cost of a slurry wall or clay liner do not have to provide the information <br />