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February 1998 H-C Coal 1997Annual Reclamation Report • Tables <br />• <br />• <br />J <br />TABLE 1 <br />1997 SEDIMENT VOLUMES <br /> Sediment Storage Total Sediment % Sediment Storage <br /> Ca aci (Acre Feet) (Acre Feetl Occu ied <br />Sho IO/iice Pond (Pond 003) <br />Desi n' 0.25 0 0 <br />1997 1 .1 0 0 <br />Mine Area Pond (Pond HG-BI <br />Desi n= 5.95 0 0 <br />1997 6.50 0 0 <br />"' Design based on 1992 as-built survey submitted to DMG as part of TR-60. No appreciable <br />erosion has occurred in the interim therefore available storage capacity is considered to have <br />remained constant at 0.25 acre feet. <br />"' Pond HG8 design sediment storage capacity was recalculated in 1996 based on a new principal <br />spillway decant elevation. The principal spillway was modified in 1996, as approved by DMG <br />under TR-66. The spillway modifications included a trickle tube decant which resulted in an <br />increase in the amount of available sediment storage capacity. <br />Montgomery Watson Americas, Inc. (dba TenaMatnzJ <br />PO. Sax 774018 Steamboat Springs, CO 80477' (970J 8796260 <br />}/I: /YAp <br />