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Williams and Weiss Consulting, LLC <br />5255 Ronald Reagan Boulevard, Ste. 220 <br />Johnstown, CO 80534 <br />September 25, 2015 <br />Ioana Comaniciu <br />State Engineer's Office <br />1313 Sherman Street, Room 818 <br />Denver, CO 80203 <br />RE: Amendment to 2015 Substitute Water Supply Plan for the J-2 Contracting Company's Journey <br />Ventures Gravel Pit, M-2008-080 <br />Dear Ms. Comaniciu, <br />Williams and Weiss Consulting, LLC is submitting an amendment to the Journey Ventures Pit, Substitute <br />Water Supply Plan (WDID 0102541) and would like to apply an existing credit of $257 (receipt no. 3669004) <br />toward the cost of filing this amendment. Journey Ventures intends to begin dewatering operations in <br />October, 2015 to facilitate the construction of a slurry wall around the mining operation. The dewatering <br />water will be pumped into a silt pond and recharge pond located on the south-east corner of the property. As <br />part of this operation, the amount of exposed surface water will increase from approximately 0.12 acre-feet to <br />0.36 acre-feet. The amount of mined product is not expected to increase beyond the original estimate of <br />250,000 tons. <br />This amendment serves two purposes; <br />• Update the existing SWSP's projected depletions to the South Platte River as a result of the increased <br />exposed surface area <br />• Provide a description of the dewatering activities and the plan for meeting the resulting lagged <br />depletions <br />In addition to this SWSP amendment, J-2 Contracting Company is in the process of securing a bond in the <br />amount $349,524 as required by the Division of Reclamation, Mining and Safety. It is expected to be in place <br />by October 1, 2015. <br />Water Usage and Updated Consumptive Use: <br />The consumptive use at Journey Ventures is comprised of losses from evaporation, water retained in sand and <br />gravel removed from the site, water used for dust control, and water pumped to the batch plant. Due to the <br />expected increase in exposed surface water, the Evaporative Losses portion of the original plan has been <br />updated as follows. <br />Evaporative Losses_ <br />The total proposed exposed groundwater surface within the Journey Ventures Pit will increase from the <br />original 0.12 acres to 0.36 acres to account for dewatering operations. Table 1 calculates the evaporative <br />losses from the Journey Ventures Pit projected for the period of April 2015 through March 2016, showing the <br />increase in surface area beginning in October 2015. Table 2 identifies the expected operational losses through <br />March 2016, and the combined water usage for the above demands is given in Table 3. <br />Lagged Depletions: <br />For the original SWSP, the IDS AWAS Model (version 1.5.84) was used to calculate lagged depletions <br />to the South Platte River. The model was executed in Effective SDF mode, using a stream depletion <br />factor of 120 as obtained from plate -6 of Hydrogeologic characteristics of the valley -fill aquifer in the <br />Greeley reach of the South Platte River valley, Colorado (Hurr and Schneider, 1973, USGS Open -File <br />1 <br />