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<br />1 <br /> -s- <br />1 <br /> channel to the east of the operating area. The upper ~~80 feet <br />t consists of 66 inch conduit; the size then increases to 72 <br /> inches for the next 830 feet, and terminates in 350 feet of <br /> 66 inch conduit near the mouth. Figure 1 shows the general <br /> plan of this facility. The size of the conduit is adequate <br />' to convey the 100-year flood discharge. A depth of water at <br />h <br />f <br />f <br />f <br />li <br />i <br />• <br />i <br />i <br />i <br /> t <br />nlet o <br />ne or <br />nvert <br />s <br />e <br />8 <br />eet over the p <br />pe <br />low <br /> required to get the floodwaters into the pipe, assuming no <br /> blockage by rocks or debris. If the pipe entrance is 508 <br /> blocked, a depth of 15 feet over the invert is required. <br />' f th <br />i <br />fi <br />d <br />h <br />h <br />id <br /> Quarry operat <br />e o <br />e <br />ons are con <br />ne <br />to t <br />e nort <br />s <br /> gulch. An access road is scheduled to be constructed across <br />' Strain Gulch to the south quarry area. The inlet of the <br /> drainage conduit will be located to the west or upstream of the <br />t access road embankment with the road forming a sedimentation <br /> and detention area. Until the road is completed some storm <br />' runoff will pass through the operating area. Runoff from the <br /> quarry itself follows a course down an interior access road <br />' and goes through the operating area discharging over the end <br />f th <br />fill <br /> o <br />e <br />. <br /> North Quarry Exterior Access Road <br /> A road has been constructed to the top of the north quarry <br />' area along the east slope of the quarry site area. This road <br /> is visible from the main highway and is an object of environ- <br />' mental concern. The Thorne report of 1972 discusses the need <br />f <br />ti <br />i <br />h <br />i <br /> or vegeta <br />ve cover to protect t <br />e cut slopes aga <br />nst eros <br />on <br /> and recommends outsloping the road to prevent runoff water £rom <br />' becoming concentrated. This outsloping presents a safety hazard, <br /> however, and the road has been constructed with an inward slope <br />' and berm along the outer edge in accordance with Bureau of <br /> Mine s'recommendations. The Bureau of Mines makes an annual <br />' inspection of the mining operation under provisions of IiB 1529. <br />1 <br />' ~\ Leonartl Rice Consult!ng Wafer Ecg veers Inc ~_ -_ <br />