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ENFORCE34885
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Last modified
8/24/2016 7:44:39 PM
Creation date
11/21/2007 2:23:22 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Enforcement
Doc Date
8/12/1993
Doc Name
HYDROLOGICAL MODELLING CHRONOLOGY
Violation No.
CV1993077
Media Type
D
Archive
No
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April 14, 1992 - Colowyo submits supplemental information to MLRD regazding PR-1. <br />Included was a detailed curve number justification and agreement to <br />change from a "slow" to "medium" hydrograph response. <br />April 22, 1992 - Colowyo created and submitted supplemental Map 12A -Hydrology of <br />Gossard and Mine Maintenance Areas, and submitted to MLRD. <br />April 28, 1992 - Colowyo submits a request for a Technical Revision ('I'R) to allow the <br />building of the Prospect Pond. Timing has become critical for the <br />building of the pond and diversion ditch so that topsoil can be stripped and <br />mining of Section 16 can commence without any further delay. This TR <br />request was necessary because approval of Colowyo's Permit Application <br />• was still pending with MLRD. <br />May 10, 1992 - One yeaz anniversary of Colowyo's submittal to MLRD of the Permit <br /> Renewal/Permit Revision Application. Approval by MLRD still pending. <br />-~, <br />May 19, 1992 - Colowyo receives an adequacy review letter from MLRD regazding the ,~ <br /> Prospect watershed modelling. The Division has concerns regarding "the ~w3w3~ ~( <br />`~'~ appropriateness of the modelling assumptions used" and that "a cleaz 60 ~a 4~ <br />~' <br />~` <br />~ resolution of the questions regarding modelling assumptions needs to be <br />" 4', <br />S 9'9' <br />~ ~ <br />~ <br />a <br />~\b uk . Enclosed was an erroneous SEDCAD run for the Prospect <br />reached ... /.~ <br />"`' <br />~ <br />~ "`O watershed performed by Kent Gorham, MLRD. This modelling showed ^ <br />s <br />~ <br />~~~^~' a total runoff volume ime greater than the design submitted by ~~'~~ <br />N~ <br />0.se~r4H•.,~ - Colowyo May 10, 1991. Errors in MLRD's model can be readily pointed q~ .o <br /> out. Additionally it was stated "Use of the above model would also ~ <br />Krn~ o~~ ~ ~vo\vo,~.,,,l~-t- possibly affect the sizing and channel protection needs of the diversion <br />" ~,o~;~ <br />``/ <br />~ ~ '~ p R This diversion is the South <br />routing runoff to the Prospect Pond. .4 <br />a <br />~` q <br />°~ <br /> Collection Ditch. 0 <br />4,• <br /> 4. ~~ <br />May 22, 1992 - Colowyo meets with MLRD in Denver to discuss outstanding bonding and <br />hydrological concerns. From this meeting, the agreement is reached to <br />approve the Technical revision allowing the prospect Pond to be built with <br />the understanding that Colowyo and MLRD would jointly model and come <br />to agreement on the hydrological modelling of the Prospect watershed. <br />Steve Wathen, DMG, would be assigned to model the watershed with J. <br />Gazcia of Colowyo. <br />May 26, 1992 - MLRD formally approves Prospect Pond TR. ~ ,5a,~, cetla~H~~ a~+~-- <br />i <br />}'p p•~e-w.i~' ~ur'{'1..~ A.~.~ 0~ pi'~ 3agclopma•n'~' <br />May 28, 1992 - Colowyo submits letter to MLRD~ormally explaining the agreement <br />reached to build the Prospect Pond and to come to a consensus on the <br />hydrological modelling. MLRD (Steve Wathen) ignores this letter <br />completely by providing no response or feedback. <br />
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