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Poudre Pits Combined SWSP <br />Plan iDs 3218, 3589 Et 4585 <br />January 16, 2018 <br />Page 2 of 10 <br />The site permitted under DRMS permit no. M-1996-060 is comprised of three adjacent parcels <br />known as the Firestein, Tigges and Roberts parcels. Mining on the Roberts parcel was completed in <br />May of 2006. The Roberts pit has been reclaimed and a plan for augmentation approved in case no. <br />2002CW331. Depletions from current operations at the Roberts portion of the site will be covered <br />under the decreed plan for augmentation, while depletions from past dewatering at the Roberts <br />portion of the site and all depletions from the Firestein and Tigges parcels will be covered under this <br />SWSP. <br />The La Poudre site consists of three separate cells designated as the West Lake, Middle <br />Lake, and East Lake. Some additional aggregate has been discovered below the West Lake and is <br />proposed to be mined during this plan period. Mining in this area is anticipated to be completed by <br />mid -2017. An additional parcel in the northwest corner of Section 19, known as the Lee Parcel, has <br />been amended into the mining permit boundary and is anticipated to begin being mined in February <br />or March of 2018. The area is proposed to be wet mined and will have approximately 1 acre of <br />ground water exposed in dewatering trenching, which is included in the La Poudre site depletions. <br />Dewatering water will be delivered to recharge in the West Lake/Wildlife Lake located in the <br />western portion of the La Poudre site. It is assumed that 50% of the water pumped into the lake <br />wit[ recharge into the West Lake and 50% will be discharged from the lake directly to the river. No <br />mining is proposed to occur at the La Poudre North site during this plan period. <br />Depletions <br />Evaporation and Operational Losses <br />During this SWSP period, depletions will consist of evaporation losses and production <br />depletions at the Firestein/Tigges, La Poudre, and North La Poudre Pits. The depletions for each <br />site are shown in the following table: <br />Table B - 2018 Site Depletions (acre-feet)" <br />'Depletions shown do not include those from past or projected dewatering operations at the sites. <br />For the purposes of this SWSP, depletions are assumed to impact the Cache la Poudre River <br />perpendicular to the point of depletions, which is considered to be the centroid of the exposed <br />surface area at each site. Evaporative depletions for each site were calculated using a gross annual <br />evaporation of 38.5 inches, with a credit of 9.78 inches for effective precipitation (based on an <br />average annual precipitation of 13.97 inches for the Windsor weather station). <br />Operational losses at the Firestein/Tigges site will consist of 0.96 acre-feet of water for dust <br />control. Depletions from the Firestein/Tigges site will impact the Cache la Poudre River upstream <br />of the Greeley No. 3 Ditch (WDID 0300934). <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 />Evaporation <br />Water Lost <br />Water Consumed <br />oust <br />Total <br />Total Lagged <br />Site Name <br />Lasses <br />in Mined <br />in Concrete <br />Control <br />Depletions <br />Depletions <br />Product <br />Batching <br />Firestein/Tigges <br />100.00 <br />0 <br />0 <br />0.96 <br />100.96 <br />102.55 <br />La Poudre <br />42.75 <br />12.50 <br />13.08 <br />2.20 <br />98.67 <br />98.62 <br />North La Poudre <br />28.14 <br />Total <br />170.89 <br />12.50 <br />13.08 <br />3.16 <br />199.63 <br />201.17 <br />'Depletions shown do not include those from past or projected dewatering operations at the sites. <br />For the purposes of this SWSP, depletions are assumed to impact the Cache la Poudre River <br />perpendicular to the point of depletions, which is considered to be the centroid of the exposed <br />surface area at each site. Evaporative depletions for each site were calculated using a gross annual <br />evaporation of 38.5 inches, with a credit of 9.78 inches for effective precipitation (based on an <br />average annual precipitation of 13.97 inches for the Windsor weather station). <br />Operational losses at the Firestein/Tigges site will consist of 0.96 acre-feet of water for dust <br />control. Depletions from the Firestein/Tigges site will impact the Cache la Poudre River upstream <br />of the Greeley No. 3 Ditch (WDID 0300934). <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 />