My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2012-07-03_HYDROLOGY - M1977023
DRMS
>
Day Forward
>
Hydrology
>
Minerals
>
M1977023
>
2012-07-03_HYDROLOGY - M1977023
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 5:02:33 PM
Creation date
7/17/2012 3:32:59 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977023
IBM Index Class Name
HYDROLOGY
Doc Date
7/3/2012
Doc Name
SUBSTITUTE WATER SUPPLY PLAN
From
DWR
To
DRMS
Email Name
GRM
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
13
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Mr. Peter Foster, P.E. Page 2 <br />June 28, 2012 <br />Figure 4. The credits for the pre -1981 area are tied to the location identified on Figure 4 <br />and may not be re- allocated to other areas of ground water exposure within the gravel pit <br />permit boundary. <br />In accordance with the letter dated April 30, 2010 (copy attached) from the <br />Colorado Division of Reclamation, Mining, and Safety ( "DRMS "), all sand and gravel <br />mining operators must comply with the requirements of the Colorado Reclamation Act <br />and the Mineral Rules and Regulations for the protection of water resources. The April <br />30, 2010 letter from DRMS requires that you provide information to DRMS to demonstrate <br />you can replace long term injurious stream depletions that result from mining related <br />exposure of ground water. <br />In accordance with approach nos. 1 and 3, you have indicated that a bond has <br />been obtained for $155,814 through the Division of Reclamation, Mining, and Safety <br />( "DRMS "). This bond is for reclamation requirements under the current mining permit but <br />may not be sufficient for lining or backfilling the pit to ensure that depletions from <br />groundwater evaporation do not occur in the unforeseen event, or events, that would lead <br />to the abandonment of the Pit. Future SWSPs for this site will not authorize any <br />expansion of the area of exposed ground water until the Applicant provides <br />documentation that a bond sufficient to cover lining or backfilling of the pit has been <br />obtained. <br />Depletions <br />You have provided a monthly breakdown of the annual depletions totaling 10.37 acre - <br />feet of evaporative Toss from 17.2 acres of exposed surface area, 0.7 acre -feet of water lost with <br />mined product associated with 24,000 tons of aggregate, and 1.30 acre -feet of water used for <br />dust control. Consumptive use at the pit totals 12.37 acre -feet per year. <br />Computation of evaporation under this plan was reduced during the ice covered period. <br />You have assumed the ice covered period to occur during the months of November, December, <br />January, February and March based on the average monthly temperatures of 27.9 °F for <br />November, 13.45 °F for December, 9.15 °F for January, 14.6 °F for February and 26.6 °F for <br />March. Temperature data were obtained from the Gunnison SW weather station. The ice <br />covered periods may be used to reduce the amount of evaporative losses that need to be <br />replaced; however, for the purpose of this SWSP, the Applicant shall replace the net evaporation <br />depletions from the exposed ground water surface area that may occur during the assumed ice <br />covered period (November, December, January, February and March) for any time that the pit is <br />not completely covered by ice. <br />Computation of evaporation under this plan was also reduced by the dry-up credits from <br />the existing pits (17.2 acres post -1981) formerly irrigated by the Seventy -Five Ditch. The dry-up <br />calculation for the inundated areas is shown in Table 2A (attached). Using the State <br />Consumptive Use model with the Upper Gunnison High Elevation Calibration Coefficient with no <br />effective precipitation, the Unit Potential Consumptive Use was determined to be 2.21 acre -feet <br />per acre. Thus the dry-up credits for the irrigated area under the pits equal 38.08 acre -feet <br />(17.2x2.21). <br />
The URL can be used to link to this page
Your browser does not support the video tag.