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<br />area runoff from the limited portion of the loadout area (approximately <br />0.6 acres) south of the.pertmeter ditch from leaving the permit area. <br />The railway containment berm was previously designed and :sized in <br />conjunction with design of other required sedimentation control structures <br />for the loadout area. Relevant design information is presented on pages <br />185=186 of Exhibit 19. Drainage and Sediment Control Plan. <br />Wh11e containment berm designs were reviewed and approved as a component <br />of the EFCI Permit Application document, the associated drainage area was <br />not specifically addressed as a Small Area Exemption. Given that the <br />existing berm provides an effective alternative to full scale drainage and <br />• sediment control. the contributing drainage area is small. and there is no <br />underground mine discharge 1n the area. the subject Brea appears to be <br />compatible with regulatory provisions for designation as a Small Area <br />Exemption. EFCI, therefore. respectfully requests CMLRD approval of a <br />Small Area Exemption for the railway containment berm. <br />f'0 EXPLOSIVES BUNKER <br />The Explosives Bunker is located approximately 1,100 feet southwest of the <br />mine portals on the northwest facing slope of a small ridge. The adjacent <br />area to the southwest 15 the former Newlin Creek Mine, which has been <br />sealed and recently reclaimed. The nearest surface drainage is Magpie <br />Creek. approximately 300 feet to the northwest. The Explosives Bunker <br />consists of a graveled pad approximately 50 x 50 feet. two standard skid- <br />mounted explosive magazines. and a 200 foot graveled access road. <br />The disturbance area associated with the Explosives Bunker .is small <br />(approximately 0.20 acres) and does not directly affect arty drainages. A <br />diversion berm will be constructed on the south end of the disturbed area <br />for the explosives bunker. This diversion berm 1s designed to intercept <br />and convey peak discharge from a 10-year. 24-hour storm event for the <br />upslope drainage area around the explosives area. A runoff collection <br />ditch, on the north side of the disturbed area. and sediment fence, both <br />designed for the 10-year, 24-hour storm event, will be used to prevent <br />potential degradation of downstream waterways. <br />HEVTN16.RfiV <br />,+n siaa ,,.~. 206R Revised - November 1993 <br />