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Hokestra SWSP Page 4 of 11 <br />March 20, 2017 <br /> <br />Table 2: Glover parameters by cell <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />X – Distance from well to river, measured from the centroid of the exposed area <br />W – Distance from the aquifer boundary through the well to the river channel <br />T – Transmissivity of the alluvial aquifer between the well and the river (source: Tgrid0309 GIS <br />layer from SPDSS) <br />S.Y – Specific Yield <br />The total lagged stream depletions from the operation of the Hokestra Pit during this plan <br />period are 113.3 acre-feet (Table 6 attached) which also includes lagged depletions from previous <br />mining activities within the lined Cells 2-6 and lagged dewatering depletions. <br />Dewatering <br />According to the application, the applicant does not anticipate dewatering any of the cells <br />during this SWSP period. Cells 2 through 6 were lined in 2013 and received liner approvals from the <br />SEO on October 7, 2014. <br />This SWSP will also cover post-pumping depletions from previous dewatering operations that <br />have since ceased. Cells 2 through 4 were already empty in 2013 and so experienced maintenance <br />dewatering operations to allow for construction of liners. Cells 5 and 6 were both full in 2013; the <br />cells experienced both an initial dewatering and maintenance dewatering to allow for construction <br />of their liners. As a result of these dewatering activities, along with dewatering from previous <br />years, the river is expected to experience a post-pumping depletion in the amount of 13.5 acre-feet <br />during the period of this SWSP. Post-pumping depletions will continue to impact the river after this <br />approval period and must therefore continue to be included in future SWSPs. <br />Replacements <br /> The sources of replacement water are 3.75 shares in the Rural Ditch Company owned by the <br />County, storage of excess credits of these shares in Varra Companies’ 112 Reservoir and Hokestra <br />Pit, and free river water previously stored in lined cells of Hokestra Pit. Depletions occurring in <br />May through September will be covered by Rural Ditch water that is immediately returned to the <br />Location X (ft) W (ft) T (gpd/ft) S.Y. <br />Cell 1 2,083 9,403 14,483 0.2 <br />Cell 2 843 9,246 10,338 0.2 <br />Cell 3 2,320 10,427 14,483 0.2 <br />Cell 4 889 7,590 10,338 0.2 <br />Cell 5 2,725 8,954 15,414 0.2 <br />Cell 6 2,032 8,924 13,775 0.2 <br />Cell 7 1,032 8,902 12,264 0.2 <br />Cell 8 306 8,812 9,364 0.2 <br />Cell 9 495 8,772 8,444 0.2 <br />Cell 10 1,015 8,979 9,540 0.2 <br />Cell 11 390 8,181 8,042 0.2 <br />Cell 12 782 9,159 9,527 0.2 <br />SW Services Pump 2,083 9,403 14,483 0.2