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~J <br />• <br />i• <br />TABLE 2.05-3 <br />SEDIMENT POND CHARACTERISTICS <br />Identification Outfall Location Drainage Runoff Sediment Storage <br /> No. Area Volume Volume CapacityZ <br /> acres acre-feet ~ acre-feet ~ acre-feet <br />001 001 Ex losives stora a area 3.87 0.0 0.0 0.20/0.20 <br />002 002 Landfill area 7.25 0.0 0.0 0.41/0.41 <br />003` 003 Sho /office area 25.16 0.01 0.0 1.73/1.73 <br />HG-8' 004 Mine area 320 2.26 0.013 22.1/>17 <br />1. Volumes from 8/20/91 SEDCAD modeling except HG-8, which are from 4/5/96 SEDCAD <br />modeling; all volumes except HG-8, 24-hour storm event (2.3 inches) <br />2. First number =design capacity (water + sediment); second number =available capacity on <br />7/1/961/5/94 <br />3. Volume from 10-year, 24-hour storm event (1.8 inches) <br />'Ponds approved as permanent impoundments <br />Design standards and performance specifications for the permanent impoundments and drainage ditches <br />aze discussed in Section 4.05 of this document. <br />Overburden <br />During reclamation, a total of 983,000 cubic yazds of overburden were backfilled from two overburden <br />stockp$es into the pit. Approximately 638,000 yazds of this material came from the "permanent" <br />overburden dump and 345,000 yazds from a "temporary" stockpile. Table 2.05-4 summarizes volumes of <br />overburden moved during final mine closure and reclamation operations. Equipment used for mine <br />backfilling were TS 24 scrapers and D-9 dozers. As previously noted, approximately 7,500,000 yazds of <br />excess overburden was placed in a permanent spoil pile located north of the pit azea. <br />TABLE 2.05-4 <br />OVERBURDEN BALANCE SHEET 1985-1986 <br />Volume Removed Ic From Volume Backfilled To <br />868,000 cut 12 868,000 cut 11 <br />1,258,000 cut 13 261,000 cut 11 <br /> 997,000 cut 12 <br />1,504,000 cut 14 345,000 'temp "stockpile <br /> 197,000 cut 12 <br /> 786,000 cut 13 <br /> 176,000 cut 14 <br />842,000 cut 15 713,000 cut 14 <br /> 129,000 cut 15 <br />239,000 cut 16 239,000 cut 15 <br />345,000 'Temporary' 138,000 cut 15 <br /> stock ile 207,000 cut 16 <br />5,056,000 5,056,000 <br />2.05-5 Revised -11/28/95 <br />