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REV92756
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REV92756
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Entry Properties
Last modified
8/25/2016 3:14:08 AM
Creation date
11/21/2007 11:24:16 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1985029
IBM Index Class Name
Revision
Doc Date
6/8/1990
Doc Name
RESPONSE TO ADEQUACY LETTERS ALMA PLACER AMENDMENT NO 1 FN M-85-029 PURSUANT TO THE MLRB PRE HEARING
From
LAW OFFICES OF J KEMPER WILL
To
MLRD
Type & Sequence
AM3
Media Type
D
Archive
No
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<br />year flood peak was found to be 570 cfs, but was rounded to 600 ci <br />of use. The 25-year flood is unlikely to have any major impacts i <br />site. The Middle Fork of the South Platte River has a well-definc <br />valley, and as can be seen on Plate No. lA, the river comes very c <br />recirculating pond embankment in one location, but elsewhere is lc <br />distance from the pond embankment and other mine activities. The <br />crest is approximately 22 feet above the river at the point where <br />nears the embankment. It is unlikely that river flooding upstreao <br />embankments could result in overbook flow that could Find its way <br />ponds. In addition, a Eield survey Eound the toe of the north enc <br />embankment to be 8 foot above the river. Cross section AA in Plat <br />taken at the critical area of the South Platte. Riprap was placec <br />of three Eeet per the Corps of Engineers, then a five Foot walkway <br />with two feet of riprap at the toe of the embankment. <br />Accordingly, the river "threatens" the pond embankment only at th <br />the river and the toe of the embankment are immediately adjacent <br />other. Since our earlier report indicated a flood level of appro <br />feet will occur, the toe of the embankment has been riprapped to <br />of five to six feet above the normal river water elevation to pro <br />embankment in the event of the 25-year Elood. A bench, or flat a <br />included in response to a request from the Corps of Engineers to <br />vegetation and access route alongside the river. This is seen in <br />on Plate No. lA. <br />iJATEB SUPPLY DITCH <br />The MLRD requested additional information regarding the conveyanc <br />Erom the source ditch to the sluice box and pond operations. An <br />corrugated metal pipe serves as the offtake from the source ditch <br />existing pipe delivers water to the top of what is known as the C <br />Springs Cut in the vicinity of the old wash pond. The Colorado S <br />an approximate 100 Eoot wide "valley". The bottom of this "vane <br />dirt road as well as a small meandering waterway. This waterway <br />approximately' slope and is the means by which water leaves the <br />pipe and is conveyed to the point at which it is pumped under hig <br />the Ross box. The area traversed by this waterway is a previousl <br />and is primarily gravel and cobbles not subject to erosion. Shou <br />sediment be picked up by this waterway, its ultimate destination <br />recirculating pond where the sediments will settle out. <br />This supply ditch has been used historically as an effective and <br />means of supply. Due to its location, any potential failure of i <br />ditch would be captured in the recirculating pond should such an <br />event occur. <br />for ease <br />>on the mine <br />i river <br />Lose to the <br />sated some <br />:mbankment <br />the river <br />of the pond <br />to the <br />of the <br />: No. lA was <br />at a height <br />followed <br />point where <br />each <br />mately four <br />elevation <br />ct the <br />a, has been <br />ovide a <br />action AA <br />of water <br />isting <br />This <br />orado <br />ings Cut is <br />contains a <br />ows at <br />xi sting <br />pressure to <br />mined area <br />any <br />the <br />fficient <br />e supply <br />nlikely <br />4 <br />
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