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P~ABODY <br />,WESTERN, <br />III IIIIIIIIIIIII III <br />999 <br />Peabody Western Coal Company <br />,~~ <br />^n, <br />~/. <br />October 20, 1993 ~C Vii, <br />c,;,, T22199 <br />Ms. Susan Burgmaier - <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 ~, <br />Denver, CO 80203-2273 <br />RE: Seneca II-A Mine Permit C-82-057, NOV C-93-134 <br />Dear Ms. Burgmaier: <br />The attached information is submitted to comply with Step No. 1 <br />of NOV C-93-134 issued at Seneca II-W Mine on September 24, <br />1993. Abatement Step 1 required submittal of designs for the <br />sump, ditch, and berm used for sediment and runoff control at <br />Soil Stockpile QQ. <br />Enclosed please find the design information for the sediment <br />control structures at Topsoil Stockpile QQ. The catchment sump <br />(QQ-S1) has been designed to totally contain the runoff from a <br />10-year, 24-hour precipitation event. The calculations <br />demonstrate the disturbed area (1.4 acres) of Stockpile QQ will <br />meet the requirements of Rule 4.05.2(3)(a) for small area <br />exemption (SAE). The location of Sump QQ-S1 is depicted on <br />Figure 1 and a typical detail is shown on Figure 2. The sump <br />(QQ-S1) will be reconstructed larger than the design capacity of <br />0.01 acre-feet (450 ft') to allow for sediment storage. The <br />catchment ditch (QQ-D1) surrounding the stockpile has been <br />designed to contain the runoff from a 10-year, 24-hour storm. <br />The ditch is a v-ditch with lh:ly side slopes and a minimum <br />depth of 0.5 feet. <br />Per Abatement Step 2 of NOV C-93-134, the as-built certification <br />of Topsoil Stockpile QQ Sump QQ-S1 will be submitted to the <br />Division by October 31, 1993. Exhibit 13-2 and Attachment 13-8 <br />in Tab 13 will be revised to include the design information, as <br />well as the as-built certification of Sump QQ-S1. <br />I have also enclosed Tom Wainwright's revised October 13, 1993 <br />letter regarding abatement of Step 2 for NOV C-93-135. Tom's <br />original letter indicated the abatement applied to NOV C-93-134. <br />Peabody Western Cool Compony • 100 SwKh Yale Stroef • Flopsfo(f, Arizona 86001 • Tabiphene (604) 774.543 • Fax (604( 77~-43% <br />