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Aggregate Industries South Platte Combined SWSP January 30, 2019  <br />Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 12 of 21  <br /> <br />The historical return flows associated with the 1.038 shares that are the subject of this SWSP  <br />must be maintained in accordance with the return flow factors identified in paragraph 35.F of the  <br />decree entered in case no. 2016CW3186. The return flow obligations will accounted for and replaced  <br />under this SWSP.  <br />The total consumptive use credit in 2019 is projected to equal 209.96 acre-feet, which is  <br />greater than the dry-year yield because of the reduced subsurface return flow obligation  <br />requirement resulting from low deliveries in 2018. Aggregate anticipates utilizing the augmentation  <br />structures on the Brighton Ditch operated by the City of Aurora for the delivery of these shares.  <br />  <br />Replacement Summary <br />The proposed depletions and replacements are shown in the attached “South Platte Combined  <br />Substitute Supply Plan Accounting 2019”. The transit loss for each stream was estimated as 0.5% per  <br />mile for the South Platte River and 0.25% per mile for the Poudre River. The stream miles for each  <br />source is found on the Transit Loss spreadsheet submitted as part of the Applicant’s accounting.  <br /> <br />Additional Water Supplies – Not Currently Authorized for Use in this SWSP <br />The Applicant owns or has/may obtain the right to use the following additional water  <br />supplies, which are not currently included as authorized replacement sources in this SWSP. The  <br />details of each source are provided herein solely for informational purposes.  <br />Source Comments <br />Bergen Reservoirs 4, 5, & 6​a 191 shares total <br />Boyd & Freeman Ditch​b 240 shares, owned by City of Greeley <br />Centennial​a Perpetual lease, 30 acre-feet  <br />City of Greeley​b Lease  <br />City of Longmont​b Lease <br />Godding, Dailey & Plumb Ditch​a 3 shares total <br />Huett Seepage Ditch​a 100% ownership <br />L.G. Everist​b Lease  <br />Last Chance Ditch Co. No. 2​a 0.3154 shares total <br />Left Hand Ditch Company​a 4 shares total <br />Leggett-Owens Reservoir​a 19.6 shares total <br />Lupton Bottom Seep Ditches No. 1 & No. 2​a 100% ownership <br />Platte River Power Authority Lease​b Lease <br />Silver Heights​b Lease <br />Smith & Emmons Ditch​a 1.5 shares total <br />a​The use of these sources for replacement purposes will only be allowed pursuant to a request for a new SWSP that provides  <br />the necessary additional information detailed for each source in our letter of December 8, 2014, and summarized below. <br />b​The Applicant must provide a copy of a lease/purchase agreement to the State Engineer’s Office and the division engineer  <br />for use of such additional replacement water prior to its use as a replacement source under this SWSP. In addition, this  <br />source of replacement water may only be used in this SWSP if the Applicant complies with the attached Division One  <br />Administration Protocol “Use of Replacement Sources Not Specifically Identified in an SWSP or Augmentation Plan”.  <br />Boyd & Freeman Ditch  <br />In the past, Aggregate has utilized 240 shares in the Boyd & Freeman Ditch Company currently  <br />owned by the City of Greeley. Aggregate is currently in discussions with Greeley on the continued  <br />use of these shares in this SWSP. Until approval for their use is given by Greeley, no credit from the  <br />Boyd & Freeman Ditch shares will be claimed in this SWSP.