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~~ <br />February 1999 Yoart lbfine * 13-12 Drainage and Sediment Control Plan •6 <br />3.5 PRACTICE FACTOR, P <br />The practice factor is used to account for conservation practices for the watershed. The values utilized are <br />shown in Table 13-12.4, Practice Factor and were adapted from Renard et al. (1997) as presented in <br />Warner et al. (1998). These values were agreed upon during discussions between SCC and Division <br />representatives as part of the south mine area expansion in 1999. <br />TABLE :13-12.4 <br />PRACTICE FACTOR <br />Surface Surface Type Practice Practice Factor <br />Undisturbed Varies None 1.0 <br />Disturbed Topsoil Stripped/Spoil Rough and Irregular 1.0/0.8 <br />3.6 SEDIMENT PARTICLE DISTRIBUTION <br />A sediment particle size distribution was input into the SEDCAD4 computer model. The distribution was <br />obtained from previous analyses presented in the Seneca II mine permit and is presented in the SEDCAD4 <br />printouts. <br /> <br />Montgomery Watson Mining Group * 165 S. Union Boulevard, Suite 460 * Lakeu~aoa; Colorado 80228 * (303) 763-5140 <br />x_37 Revised 08/08 <br />