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C O L O R A D O John W. Hickentooper <br /> Governor <br /> Division of Water Resources <br /> Robert Randalt <br /> Executive Director <br /> Kevin G. Rein, P.E. <br /> Director/State Engineer <br /> August 6, 2018 <br /> Gary Linden, P.G. <br /> Civil Resources, LLC <br /> 323 Fifth Street <br /> P.O. Box 680 <br /> Frederick, CO 80530 <br /> Transmission via email: gary@civilresources.com <br /> RE: SLURRY WALL LINER APPROVAL <br /> BERNHARDT PIT(POND 4) (WDID 0403395) <br /> BERNHARDT PIT, DRMS M-2002-120 (WDID 0403007) <br /> SECTION 1, T4N, R67W <br /> WATER DIVISION 1,WATER DISTRICT 4, WELD COUNTY <br /> Dear Mr. Linden: <br /> The purpose of this letter is to provisionally approve the lining of the Bernhardt Pit (Pond 4). Pond 4 is primarily <br /> located in the SE1/4 of the SE1/4 and the SW1/4 of the SE1/4 of Section 1, Township 4 North, Range 67 West of the 6t' <br /> P.M., and is part of the Bernhardt Pit gravel pit (DRMS M-2002-120). Pond 4 was lined with a soil bentonite slurry wall. <br /> Mining has not commenced within the liner boundary. The slurry wall liner leak test commenced on March 12, 2018 and <br /> concluded on June 12, 2018. A site inspection was performed by our office on March 13, 2018 to review site conditions <br /> and the leak test plan. <br /> Your report dated July 6, 2018 provides the liner summary and leak test results. The test data provided indicates that <br /> liner meets the design standard referenced in the August 1999 State Engineer Guidelines for Lining Criteria for Gravel <br /> Pits (1999 SEO Guidelines). Meeting the design standard requires that during reservoir (pond) operations all water <br /> inflows and outflows for the liner perimeter enclosed area be accounted for on a monthly basis. <br /> This liner approval is applicable only during mining operations at the site and does not classify the structure as a <br /> reservoir capable of water storage. However, for the remainder of mining operations, water within the liner boundary <br /> is now classified as trapped native ground water. The trapped native ground water may be removed from within the <br /> lined area and returned to the stream system through surface flow or ground water recharge without the need for <br /> replacement so long as the operator does not put the water to beneficial use. All native trapped ground water <br /> remaining that is put to beneficial use (except for the water removed in product) must be replaced by the operator. <br /> All inflow of water into the liner boundary from any source, including precipitation and ground water inflows shall be <br /> removed by the pit operator so as not to cause out-of-priority storage. In order for the liner to be approved for <br /> water storage the operator must perform a final leak test once mining is complete and the site is at final grade. <br /> The final leak test will be allowed to have a modified duration of 30-days as long as the liner continues to satisfactorily <br /> operate during mining operations. <br /> Please contact me at 303-866-3581 x8246 if you have any questions. <br /> Sincerely, <br /> loana Comaniciu, P.E. <br /> Water Resource Engineer <br /> Ec: Jean Lever, District 4 Water Commissioner (Jean.Lever@state.co.us) <br /> Louis Flink, Diversion Records Coordinator(Louis.Flink@state.co.us) <br /> WDID File (0403395 8 0403007) <br /> Office of the State Engineer =' <br /> 1313 Sherman Street, Room 821, Denver, CO 80203 P 303,866.3581 <br /> www.water,state.co.us <br /> :4.c � <br />