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Slurry Wall Design Report <br /> Loloff Pit <br /> 5/24/2016 <br /> Page 7 of 16 <br /> 4 SEEPAGE ANALYSIS <br /> The purpose of this section is to document our findings with respect to estimated seepage rates <br /> resulting from various penetration depths of the proposed slurry wall into bedrock and to <br /> compare them to the allowable seepage rates as defined by the State of Colorado. <br /> Seepage rates from/into reservoirs are limited by the State of Colorado. Design and <br /> performance standards are calculated for each site based on the height of the slurry wall and <br /> the surface area of the bedrock enclosed in the reservoir. The design standard is 0.03 cubic feet <br /> per day per square foot of slurry wall area plus 0.0015 cubic feet per day per square foot of <br /> reservoir bottom area. <br /> Design Standard Performance Standard <br /> Reservoir Perimeter 10,243 ft3/da 53 m 30,728 ft3/da 160 m <br /> Reservoir Bottom 3,015 ft3/da 16 m 9,044 ft3/da 47 m <br /> Total 13,258 ft3/da 69 m 39,772 ft3/da 207 m <br /> The seepage analysis indicated that if a typical 4 ft competent bedrock key were used on this <br /> project, the resulting seepage is less than the State Engineer's design standard. This key is <br /> shown on the drawings. <br /> The State requires that the slurry wall design meet the design standard. The performance <br /> standard is three times the design standard and accounts for field conditions encountered <br /> during construction. The 90-day leak test, to be performed after construction, will compare <br /> actual inflow rates to the performance standard. If inflow is less than the performance standard <br /> then the State will consider the Loloff Pit to be a "sealed" reservoir. <br /> BRIERLEY <br /> ASSOCIATES <br /> Creating Space Underground <br />