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2010-05-04_HYDROLOGY - M1980149
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2010-05-04_HYDROLOGY - M1980149
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Last modified
8/24/2016 4:11:20 PM
Creation date
5/6/2010 9:09:31 AM
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Template:
DRMS Permit Index
Permit No
M1980149
IBM Index Class Name
HYDROLOGY
Doc Date
5/4/2010
Doc Name
Substitute Water Supply Plan
From
OSE
To
Clear Water Solutions
Permit Index Doc Type
Hydrology Report
Email Name
MAC
Media Type
D
Archive
No
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Michelle Hatcher <br />May 3, 2010 <br />According to the information provided by the applicant, the County will continue to dewater <br />the 9.9-acre cell during this plan period. The total exposed surface area for the 9.9-acre cell is one <br />acre in the dewatering trench. The county also intended to line the 30.5-acre cell in 2009, but lining <br />has been delayed. It is anticipated that lining will occur over the next two years. The 30.5-acre cell <br />will continue to be dewatered until lining is complete. The total exposed water surface associated <br />with this cell is 0.37 acres in the dewatering trench. <br />Currently 70.1 acres of surface acreage is exposed at the Hokestra Pit site, and approximately <br />1.37 acres are exposed in the dewatering trenches. Of the 71.47 acres of exposed surface, 67.9 <br />acres were exposed after December 31, 1980 and 3.6 acres were exposed prior to January 1, 1981 <br />(Figure 1). Based on the Division 1 Water Court decision in case no. 2009CW49, the replacement of <br />evaporative depletions is not required for ground water exposed to the atmosphere prior to January 1, 1981 <br />through open mining of sand and gravel, regardless of whether open mining operations continued or were <br />reactivated on or after that date. The Water Court effectively held that Senate Bill 120 of 1989, as amended <br />in Senate Bill 93-260, exempted all pre-1981 exposed ground water regardless of whether open mining <br />operations continued or were reactivated on or after January 1, 1981. Accordingly, for the 71.47 acres (3.6 <br />acres exposed prior to January 1, 1981 and 67.9 exposed after December 31, 1980) of ground water <br />currently exposed at the Hokestra Pit, replacement of evaporative depletions is only required from the 67.9 <br />acres exposed after December 31, 1980. <br />Weld County will irrigate approximately 0.15 acres of blue grass and 5.5 acres of native <br />grass around the reclaimed pond at the Weld County Service Center, which is a reduction from the <br />.irrigated acres at this site from previous plans. Weld County conducted a field survey on February <br />7, 2008 and reported 0.15 acres of blue grass and 5.5 acres of native grass. This area will be <br />irrigated using water pumped from the lake during the growing season. According to a Modified <br />Blaney-Criddle analysis the potential crop consumptive use for the 0.15 acres of blue grass is 0.30 <br />acre-feet and the potential crop consumptive use for the 5.5 acres of native grass is 9.35 acre-feet. <br />Since the irrigation occurs directly around the reclaimed pond, the plan assumes that the return <br />flows will return to the river in the same timing as the depletions. <br />Consumptive use from the evaporation of this site during this plan period is 173.3 acre-feet <br />from 67.9 acres of exposed surface area. The total consumption at this site from evaporation and <br />irrigation is 182.9 acre-feet. <br />The depletions from evaporation losses were lagged to the stream using a Glover analysis <br />and assuming a distance to the stream of 250 feet, distance to the impermeable boundary of 6,600 <br />feet, transmissivity of 50,000 gal/day/ft and specific yield of 0.2. The depletions from irrigation were <br />also lagged to the stream using a Glover analysis and assuming a distance to the stream of 800 feet, <br />distance to the impermeable boundary of 6,600 feet, transmissivity of 50,000 gpd/ft and specific yield <br />of 0.2. The attached Table 4 provides a monthly schedule of lagged actual depletions to the river <br />system, together with a schedule of replacement requirements. This SWSP accounts for actual <br />depletions determined to accrue to the stream system during this plan period. The total lagged <br />stream depletions from mining operations and irrigation is 183.2 acre-feet. <br />REPLACEMENTS <br />The sources of replacement water are 3.75 Rural Ditch shares owned by Weld County, <br />storage of excess credits in Varra's 112 Pit, fully consumable water leased from SVLH, and fully <br />consumable water leased from Greeley.
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