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2016-01-13_REVISION - C1981014
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2016-01-13_REVISION - C1981014
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Entry Properties
Last modified
8/24/2016 6:14:31 PM
Creation date
1/19/2016 10:27:49 AM
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Template:
DRMS Permit Index
Permit No
C1981014
IBM Index Class Name
Revision
Doc Date
1/13/2016
Doc Name
Adequacy Response
From
Kent Gorham
To
DRMS
Type & Sequence
SL3
Email Name
RDZ
JRS
Media Type
D
Archive
No
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Southfield Sediment Demonstration <br />in-depth review <br />Demo #1 Weighted LS - RDA pre -mine vs RDA post mine <br />Land type LS factor slope% m Length divide 72.6 L Degrees <br />pre RDA footprnt 2.10 6 0.5 700 9.64187328 3.1051366 3.43 <br />post flat 0.71 3.4 0.3 500 6.88705234 1.7840623 1.95 <br />post steep* 7.13 24.4 0.6 240 3.30578512 2.04910764 13.71 <br />post weight RDA 4.56 <br />*measured values taken from Phase I findings <br />Sediment Calcs A (tons/ac/yr) R K LS C P <br />Pre RDA footprnt 0.355 24.7 0.32 2.10 0.02136 1.00 pre <br />Reclaimed RDA 0.396 24.7 0.32 4.56 0.011 1.00 post <br />Demo #2 adjacent area vs post mine RDA topo with RDA cover values and weighted RDA topo <br />sin second A S LS factor <br />0.0598 0.6462 0.6762 2.0995 <br />0.0340 0.3675 0.3975 0.7092 <br />0.2370 3.9817 3.4817 7.1344 <br />Land type <br />LS factor <br />slope% m <br />Length <br />divide 72.6 <br />L <br />Degrees sin <br />second A S <br />LS factor <br />footprint <br />2.10 <br />6 <br />0.5 <br />700 9.64187328 <br />3.1051366 <br />3.43 <br />0.0598 <br />0.6462 <br />0.6762 <br />2.0995 <br />adjac. area <br />1.77 <br />6 <br />0.5 <br />500 6.88705234 <br />2.62431941 <br />3.43 <br />0.0598 <br />0.6462 <br />0.6762 <br />1.7744 <br />adjac. area <br />6.57 <br />25 <br />0.6 <br />200 2.75482094 <br />1.83677528 <br />14.04 <br />0.2426 <br />4.0757 <br />3.5757 <br />6.5677 <br />adjac. area <br />1.88 <br />8.3 <br />0.5 <br />300 4.1322314 <br />2.03278907 <br />4.74 <br />0.0826 <br />0.8925 <br />0.9225 <br />1.8751 <br />adi area ave * <br />4.37 <br />* from below <br />LS factor <br />0-3% 0.71 3 0.3 500 6.88705234 1.7840623 1.95 <br />0.0340 <br />0.3675 <br />0.3975 <br />0.7092 <br />4% 0.86 3.4 0.4 500 6.88705234 2.16378125 1.95 <br />adjac. ave <br />3.34 <br />0.3975 <br />0.8601 <br />5-9% 2.10 6 0.5 700 9.64187328 3.1051366 3.43 <br />0.0598 <br />0.6462 <br />0.6762 <br />2.0995 <br />Greater than 9% 4.64 13 0.6 400 5.50964187 2.78403072 7.41 <br />0.1290 <br />post flat <br />0.71 <br />3.4 <br />0.3 <br />500 6.88705234 <br />1.7840623 <br />1.95 <br />0.0340 <br />0.3675 <br />0.3975 <br />0.7092 <br />post steep* <br />7.13 <br />24.4 <br />0.6 <br />240 3.30578512 <br />2.04910764 <br />13.71 <br />0.2370 <br />3.9817 <br />3.4817 <br />7.1344 <br />post weight RDA <br />4.56 <br />0.0598 <br />0.6462 <br />0.6762 <br />2.0995 <br />Surround RDA 2.52 8 0.5 580 7.98898072 2.8264785 4.57 <br />0.0797 <br />0.8605 <br />0.8905 <br />2.5170 <br />Sediment Calcs A(tons/ac/yr) R K LS C P <br />Adjac. Non -mined 0.564 24.7 0.32 3.34 0.02136 1.00 pre <br />Reclaimed RDA 0.396 24.7 0.32 4.56 0.011 1.00 post <br />C Factors for RDA only (from 2013/2014 veg data) <br />RDA/ref. cover table value RDA ref. table value reclaim RDA table value <br />tall weeds/brush 60% 72.80% 80% 81.14% 95% <br />25% canopy 0.038 0.02136 0.012 0.011 0.003 <br />grass <br />Land type LS factor slope% m Length divide 72.6 L Degrees sin <br />second A S <br />LS factor <br />mwh test 0.53 3 0.3 270 3.71900826 1.48295558 1.72 <br />0.0300 <br />0.3242 <br />0.3542 <br />0.5252 <br />bookconfirm 4.33 15 0.73 210 2.89256198 2.17138259 8.53 <br />0.1483 <br />2.4919 <br />1.9919 <br />4.3252 <br />booksays 4.32 <br />the book confirm example matches exactly with the result in the book <br />Calculators <br />LS factor slope % m length divide 72.6 L Degrees Sin <br />second A S <br />LS factor <br />0-3% 0.71 3 0.3 500 6.88705234 1.7840623 1.95 <br />0.0340 <br />0.3675 <br />0.3975 <br />0.7092 <br />4% 0.86 3.4 0.4 500 6.88705234 2.16378125 1.95 <br />0.0340 <br />0.3675 <br />0.3975 <br />0.8601 <br />5-9% 2.10 6 0.5 700 9.64187328 3.1051366 3.43 <br />0.0598 <br />0.6462 <br />0.6762 <br />2.0995 <br />Greater than 9% 4.64 13 0.6 400 5.50964187 2.78403072 7.41 <br />0.1290 <br />2.1667 <br />1.6667 <br />4.6401 <br />Reasonable values <br />Land type LS factor slope% m Length divide 72.6 L Degrees Sin <br />second A S <br />LS factor <br />Surround RDA 2.90 10.4 0.6 300 4.1322314 2.34266819 5.94 <br />0.1035 <br />1.7386 <br />1.2386 <br />2.9016 <br />Surround RDA 9.95 25 0.6 400 5.50964187 2.78403072 14.04 <br />0.2426 <br />4.0757 <br />3.5757 <br />9.9548 <br />Surround RDA 2.10 6 0.5 700 9.64187328 3.1051366 3.43 <br />0.0598 <br />0.6462 <br />0.6762 <br />2.0995 <br />Surround RDA 2.52 8 0.5 580 7.98898072 2.8264785 4.57 <br />0.0797 <br />0.8605 <br />0.8905 <br />2.5170 <br />4.37 adjac. Ave <br />reclaimed RDA 7.40 28 0.6 200 2.75482094 1.83677528 15.64 <br />0.2696 <br />4.5291 <br />4.0291 <br />7.4006 <br />reclaimed portal 3.26 10 0.6 400 5.50964187 2.78403072 5.71 <br />0.0995 <br />1.6715 <br />1.1715 <br />3.2615 <br />reclaimed portal 0.50 2.5 0.3 400 5.50964187 1.66854149 1.43 <br />0.0250 <br />0.2695 <br />0.2995 <br />0.4998 <br />reclaimed portal 1.39 7.5 0.5 200 2.75482094 1.65976533 4.29 <br />0.0748 <br />0.8079 <br />0.8379 <br />1.3907 <br />3.14 Reclaim ave <br />Adjac. Non -mined Reclaimed RDA <br />Demo #1 0.355 0.396 Only RDA cover and premine RDA topo <br />Demo #2 0.564 0.396 only RDA cover and surrounding LS <br />Original demo 0.353 0.275 Site wide cover values <br />- 0.356 <br />The results indicate that the reclaimed area produces less sediment than a similar, adjacent non -mined area <br />when the site is looked at as the total 92 acre mine site/RDA disturbance. <br />82.6 acres reclaimed 38 (46%) are the RDA <br />Additionally, sediment ponds remain, vegetation will likely continue to improve, observations show no <br />sign of erosion beyond what is occuring in adjacent areas, in fact show less erosion in many places, RDA has documented <br />eveience of self -healing <br />
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