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Tri-County Gravel Pit, M77-205 Page 2 of 13 <br /> February 27, 2025 <br /> Safety under File No. M-77-205. The $257 fee has been accepted with receipt no. <br /> 10034480. <br /> SWSP Operations <br /> The Tri-County Gravel Pit is located in the NE'/a Section 29, Township 14 South, Range <br /> 92 West of the 6th P.M., and is currently operated pursuant to an underground water <br /> right and an augmentation plan that were decreed on August 29, 2000 in Case No. <br /> 99CW216, and DWR well permit no. 87771-F, issued January 12, 2023. The <br /> augmentation plan allows for a maximum surface area of the exposed ground water of <br /> 33.4 acres; well permit no. 87771-F identifies the eventual maximum surface area of <br /> exposed ground water as limited to 70.5 acres at the conclusion of all mining and <br /> reclamation activities. Pursuant to Case No. 99CW216, the use of the ground water at <br /> the site in addition to evaporation (90.13 acre-feet) is limited to water lost with the <br /> mined product for up to 105,120 tons of mined material per year (3.09 acre-feet). <br /> During the period of this SWSP, mining at the site will continue under dewatered <br /> conditions with production of material expected to expand to 160,000 tons annually, <br /> with the 54,880 tons of additional material depletions to be covered under this SWSP. <br /> Dewatering of the pits is accomplished by a system of pumps and dewatering <br /> trenches, with the water removed from the pits being routed through sediment <br /> retention ponds before release. <br /> For both Years 1 and 2 of this plan, mining operations will be conducted in the Phase <br /> A, B, and C areas of Pit #1, which together total 36 acres, under dewatered conditions <br /> (Figure 3). In November 2021, Applicant halted mining and began reclaiming a <br /> portion of the Pit #1 area, exposing 18.4 acres of groundwater that is now identified <br /> as Reclaimed Pond. An earthen berm will be constructed to separate the pond from <br /> the Phase A, B, and C areas to be mined during this plan period. The surface area of <br />