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2008-05-14_HYDROLOGY - M1980149
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2008-05-14_HYDROLOGY - M1980149
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Last modified
8/24/2016 3:31:33 PM
Creation date
5/15/2008 2:40:09 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1980149
IBM Index Class Name
HYDROLOGY
Doc Date
5/14/2008
Doc Name
Substitute water supply plan
From
DWR
To
Clear Water Solutions
Email Name
CBM
Media Type
D
Archive
No
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Steve Nguyen <br />May 14, 2008 <br />lining is complete. The total exposed water surface associated with this cell is 0.37 acres in the <br />dewatering trench. <br />Currently 70.86 acres of surface acreage is exposed at the Hokestra site, including 70.1 <br />acres outside of the currently mined area and approximately 0.76 acres exposed in the dewatering <br />trenches. Of the 70.86 acres of exposed surface, 56.76 acres were exposed after December 31, <br />1980 and 14.1 acres were exposed prior to January 1, 1981. <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-Griddle 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 operation of this site consists of 4.4 acre-feet of water lost in <br />product (4% moisture of 150,000 tons of raw material), 1.2 acre-feet for on-site dust control and <br />145.76 acre-feet of evaporation from 56.76 acres of lake surface exposed after December 31, <br />1980. The total consumption at this site from mining operations and irrigation is 161 acre-feet. <br />The depletions from evaporation and operational losses were lagged to the stream using a Glover <br />analysis and assuming a distance to the stream of 250 feet, distance to the impermeable boundary of <br />6,600 feet, transmissivity of 50,000 gal/day/ft and specific yield of 0.2. The depletions from irrigation <br />were also lagged to the stream using a Glover analysis and assuming a distance to the stream of 800 <br />feet, distance to the impermeable boundary of 6,600 feet, transmissivity of 50,000 gpd/ft and specific <br />yield of 0.2. The attached Table 5 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 162.43 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 and fully consumable water leased from SVLH. Weld <br />County has obtained a lease from SVLH for 22.0 acre-feet and a copy of the lease is attached to <br />this letter. The amount leased from the SVLH includes a transit loss of 0.25% per mile for the 12 <br />miles between the pit location and the discharge point for the SVLH water. <br />This plan proposes to store excess river credits attributable to the 3.75 shares of Rural <br />Ditch. The excess river credits which accrue to the stream system in June, July and August will be <br />stored in the Varra Pit No. 112, which lies directly to the south of the Hokestra Property and across <br />the Rural Ditch. It is estimated that 81.9 acre-feet of excess credits will be available for storage <br />during this plan period. According to the reservoir operations model for the 112 Pit, the water <br />placed in the 112 pit will incur an evaporative loss of 5% or 3.9 acre-feet. The 112 Pit has access <br />to a ditch headgate, which will be used to deliver the excess river credits to the lined reservoir for <br />storage. The stored water will be released from the pit to cover depletions from the site as shown <br />in attached Table No. 5. <br /> <br />
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