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AVCOLORADO <br /> Division of Water Resources <br /> Department of Natural:Resources <br /> Water Division 2-Main Office <br /> 310 E.Abriendo Ave, Suite B <br /> Pueblo,CO 81004 <br /> January 31,2018 <br /> J.C.York, P.E., Principal <br /> J&T Consulting, Inc <br /> 305 Denver Avenue, Suite D <br /> Fort Lupton, CO 80621 <br /> Re West Farm Gravel Pit Slurry Wall, Phase 2 <br /> Slurry Wall 90-Day Performance Test Final Report <br /> Sections 33&28,T22S, R46W,6th PM <br /> M-08-078 <br /> Water Division 2,Water District 67 <br /> Dear Mr.York- <br /> The purpose of this letter is to approve the lining of the above referenced site based on your January 12,2018 submittal of <br /> the Performance Test report and documentation. The measured outflow due to pumping indicate that this site has been <br /> lined to the design standard referenced in the August, 1999 State Engineer Guidelines for Lining Criteria for Gravel Pits. <br /> Meeting the design standard requires that all water inflows and outflows for this site must be accounted for on at <br /> least a monthly basis. <br /> The following are terms and conditions associated with this approval. Not all of these requirements may be <br /> within your control so please ensure that your client is fully aware of each requirement. <br /> 1. This gravel mining operation is not currently operating under an approved plan for augmentation or <br /> substitute supply plan. GP Aggregates, LLC must take one of the following actions by March 1,2018 <br /> to remedy this situation: <br /> a. Provide written notification to Melissa van der Poel, Team 237 Team Lead, at the State <br /> Engineer's Office regarding whether approval for depletion replacement should be authorized <br /> pursuant to the SWSP request previously submitted by Michelle Hatcher, Clear Water <br /> Solutions, Inc. on behalf of GP Aggregates, LLC; or <br /> b. Provide written notification to Melissa van der Poel that the gravel pit(WDID 6706650, Permit <br /> 75864-F), which is currently not covered by any plan, will be added to LAWMA's plan for <br /> augmentation (similar in manner to inclusion of WDID 6705373 in Case No. 12CW037) so <br /> that the entire mining operation is officially covered by LAWMA's plan for augmentation. Note <br /> that LAWMA is currently replacing depletions caused by the entire mining operation, despite <br /> the fact that the gravel mine has not been added to the LAWMA augmentation plan and is not <br /> covered by an SWSP associated with LAWMA. <br /> 2. By February 12, 2018, confirm that the accounting for operation of the West Farm Pit (including <br /> ongoing metering of dewatering pumping associated with any ground water leakage into the mine)will <br /> be provided as follows: <br /> a. Sarah Morrissey,Accounting Manager,C&A Holding Company,will email the GP Aggregates <br /> accounting spreadsheet to: <br /> i. Randy Hendrix(randy _hendrix-wai.corn <br /> ii. Rebecca Nichols,WD 67 Water Commissioner(rebecca.nicholsa-state.co.us) <br /> iii. Division 2(dnr div2ground.watera-state.co.us) <br /> iv. Bill Tyner(bill.tynerastate.co.us) <br /> b. Randy Hendrix will include the reported depletions and associated replacement in the LAWMA <br /> monthly accounting provided to Division 2. <br /> 310 E. Abriendo Avenue, Suite B, Pueblo,CO 81002 P 719.542.3368 F 719 544.0800 www.water.state.co.us �'^'_��0 <br /> ra76 <br />