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if1: t`rL1 <br /> August 31, 2018 <br /> Ioana Comaniciu (via email — ioana.comaniciu@state.co.us) <br /> Division of Water Resources <br /> 1313 Sherman Street, Room 818 <br /> Denver, CO 80203 <br /> Re: Frei Hatchery Pit Gravel Mining Operations SWSP Amendment Request <br /> Dear Ioana: <br /> The Frei Hatchery Pit (WDID 0202887; DMG Permit No. 2014-043) is operating under an SWSP <br /> approved by the Division of Water Resources (DWR) on December 11, 2017. <br /> The sand and gravel at the site is being excavated in two phases. The mining in the Phase I area is <br /> nearly complete. The aquifer profile in the Phase 2 area includes about 15 feet of saturated thickness <br /> above bedrock that is overlain with dry material to the ground surface. Albert Frei and Sons (AFS) <br /> plans to dewater approximately 20 acres within Phase 2 in order to install a compacted liner to <br /> facilitate dry-mining in that area. The 15-foot saturated thickness in the Phase 2 area over 20 acres <br /> with a typical porosity of 15 percent translates into dewatering about 45 acre-feet of water, in total <br /> (15 * 20 * 0.15). Dewatering is expected to take place over the next approximately 12 months. The <br /> water budget included as Table 2 in the original SWSP request has been revised to include the <br /> projected dewatering. The lagged effects from dewatering has been estimated using the Glover <br /> analysis approved for the SWSP. <br /> As illustrated in the revised Table 2 (attached) the dewatering will increase the gross depletions <br /> (Col 7 and Col 8) for the remainder of the SWSP period, through September 2019. The immediate <br /> credits (Col 6a) provided by the dewatering along with the replacement water previously leased <br /> from Aurora will result in net accretions to the river system (Col 14) through September 2019. <br /> Therefore, no additional river depletions are forecast during the SWSP period from incorporation of <br /> the dewatering. <br /> By this letter, we request an amendment to the SWSP for the December 2017 through September <br /> 2019 period to include dewatering within the permit area. AFS will send you a hard copy of this <br /> letter along with the statutory $257 application fee for the amendment. <br /> Please call if you have any questions or would like to further discuss this SWSP amendment <br /> request. <br /> Sincerely, <br /> r <br /> Rick Parsons, P.E. <br /> cc: Ben Frei, Albert Frei and Sons, Inc. (bfrei@albertfreiandsons.com) <br /> Jorge Vidal, District 2 commissioner 0orge.vidal@state.co.us) <br /> ParsonsWater Consulting, LLC 1619 Minear Road,Medford,OR 97501 303.667.5067 Page 1 <br />