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2015-03-31_HYDROLOGY - M1999050
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2015-03-31_HYDROLOGY - M1999050
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Last modified
4/10/2017 1:48:06 PM
Creation date
4/1/2015 9:15:32 AM
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Template:
DRMS Permit Index
Permit No
M1999050
IBM Index Class Name
HYDROLOGY
Doc Date
3/31/2015
Doc Name Note
April 1, 2015 through March 31, 2016
Doc Name
Substitute Water Supply Plan April 1, 2015 through March 31, 2016
From
DNR Water Resources
To
DRMS
Email Name
MAC
Media Type
D
Archive
No
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Mr. Todd Williams, P.E. Page 2 of 6 <br />March 24, 20115 <br />positive accretion or depletion from the pond and is thus not included in the total net depletions <br />covered in this SWSP. <br />It is anticipated that 0.8 acre -feet of water will be used for on -site dust control during this <br />plan period, based on an estimate of 5 truckloads of 4,000 gallons of water per month. Water used <br />for dust conirol purposes is assumed to be 100% consumed. <br />The Timnath- Connell Pit will not be mined for sand and gravel during this approval period, <br />therefore there will be no water lost in mined product. <br />The total annual- consumptive use from evaporation (excluding the recharge pond) and <br />operational uses at the site is 15.33 acre -feet (see attached Table 4). The Alluvial Water Accounting <br />System (AW�S) stream depletion model developed by the Integrated Decision Support Group was <br />used to determine the lagged depletions from the Timnath- Connell Pit to the Cache La Poudre River <br />from past and projected evaporation and operational losses at the site. The following parameters <br />were used in the model: <br />• Distance from the centroid of the 6.03 acres to the river (X) = 2,218 ft <br />• Alluvial aquifer width,(W) = 5,300 ft <br />• Specific yield (S) = 0.2 <br />• Transmissivity (T) = 50,000 (gpd /ft) <br />Lagged stream depletions are estimated to total 15.75 acre -feet during this plan period, as shown on <br />the attached Table 4. <br />1 <br />The Applicant has continuously dewatered the Timnath- Connell Pit since 1999. Water <br />pumped for�dewatering is discharged into the adjacent recharge pond. This diversion into the pond <br />is not a part of the metered Box Elder Ditch Shares that are also discharged into the recharge pond. <br />The dewatenng depletions are lagged to the river using the same parameters as the other lagged <br />depletions from the Timnath- Connell Pit as described above. The dewatenng accretions are lagged <br />to the river !using the same parameters as the site depletions with the exception of using a distance <br />()) from the centroid of the recharge pond to the river of 3,500 ft. This dewatenng operation <br />creates lagged accretions that mimic the lagged depletions. Thus at the cessation of dewatenng the <br />only depletion that would impact the river is that which is attributable to the "first fill" of the pit. <br />The Applicant intends to line the pit when mining activity is complete thereby eliminating the <br />depletion caused by the "first fill ". Should dewatenng operations cease prior to the pit obtaining a <br />Liner approval from the Division Engineer, the Applicant must address the lagged depletions due to <br />the "first fill." <br />Replacements <br />Connell Resources, Inc. owns a total of 4.0 Box Elder Ditch Company ( "BEDC ") (WDID 0300926) <br />shares that were part of 64 shares historically used to irrigate the property known as the John Weitzel <br />Farm, which is the site of the Timnath- Connell Pit. The primary source of replacement water for this <br />SWSP will be from recharge of 2.5 of these BEDC shares. The shares will be diverted into a recharge pit <br />(WDID 0302059) located on the Timnath- Connell site. The recharge pit was constructed in an area of the <br />mining site that was previously excavated for sand and gravel mining. The remaining 1.5 BEDC shares <br />not used for recharge will continue to be used to irrigate the portion of the John-Weitzel Farm still in <br />agricultura(i production. <br />The i,diversions available at the farm headgate for the 4.0 BEDC shares used on the John <br />Weitzel property were estimated to total 364.19 acre -feet per year, and the historical consumptive <br />use of the 4.0 BEDC shares was estimated to be 168.91 acre -feet. This quantification is based on the <br />average headgate diversions for the Box Elder Ditch for the years 1950 to 2013, assuming 10% ditch <br />loss and 55% field efficiency for flood irrigation. Historic consumptive use was determined as the <br />i <br />
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