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Aggregate Industries South Platte Combined SWSP April 13, 2018 <br />Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 8 of 20 <br /> <br />of the decree entered in case no. 2003CW348. Projected deliveries for Year One were calculated in <br />accordance with paragraph 20.3.3 of the decree entered in case no. 2003CW99, and are based on <br />2002-2006 recorded deliveries. As specified in case no. 1996CW658, all GIC direct flow deliveries <br />incur an immediate surface return flow obligation of 23.7%, and all Fossil Creek deliveries incur an <br />immediate surface return flow obligation of 20.1%. The estimated consumptive use credit is <br />therefore 15.50 acre-feet per share for GIC direct flow water, and 0.95 acre-feet per share for Fossil <br />Creek Reservoir water. According to a letter received in this office on behalf of The North Poudre <br />Irrigation Company, GIC’s 60 preferred rights in Fossil Creek Reservoir may not be available to GIC <br />during WY2018. Excluding the Fossil Creek Reservoir component of the GIC deliveries, the projected <br />yield of the three shares will equal 60.93 acre-feet per year (3 shares × 20.31 acre-feet/share), with <br />a return flow obligation of 15.69 acre-feet. <br />The GIC shares will be delivered back to the river through the 23rd Avenue and Fourth Street <br />Return Station. <br />St. Vrain River <br />Replacement Sources Projected <br />2018 Yield <br />(acre-feet) Comments <br />Martin Marietta lease 14.0 Annual lease <br />Martin Marietta Lease <br /> Aggregate has entered into a water lease agreement with Martin Marietta Materials, Inc. for <br />14.0 acre-feet of fully consumable water stored in Heaton Reservoir (WDID 0504089). A copy of the <br />lease agreement, dated March 12, 2018, is attached. Heaton Reservoir is part of the Hamm Pit (M- <br />1987-176), and is located in the N½ of the NE¼ of Section 9, Township 2 North, Range 68 West, 6th <br />P.M., adjacent to the confluence of Boulder Creek with St. Vrain Creek. There are no intervening <br />water rights between the Distel and Tull Pits (upstream points of depletion) and the Heaton <br />Reservoir (downstream point of release). The slurry wall liner for the Heaton Reservoir was <br />approved as having been lined to the design standard referenced in the August 1999 State Engineer <br />Guidelines for Lining Criteria for Gravel Pits in a letter dated April 7, 2003 and it is therefore <br />classified as a lined reservoir. Deliveries from Heaton Reservoir will made be to Boulder Creek <br />during the period of April through October 2018 pursuant to the attached delivery schedule. <br /> <br />South Platte Mainstem <br />Replacement Sources Projected <br />2018 Yield <br />(acre-feet) Comments <br />Centennial 30.00 Perpetual lease <br />Westminster 1998 265.24 Available throughout the year-perpetual lease; <br />265.24 acre-feet proposed to be used in 2018 <br />Westminster Annual Lease 152 Annual lease with Westminster <br />Thornton Effluent 10.53 November – March only <br />Fulton Ditch 120.44 96 shares total; 62 to be used in 2018 <br />Brighton Ditch 216.03 1.038 shares total <br />Note: Projected 2018 yields may vary from previous estimates of the net yield due to the computed return flow <br />obligations based on the previous year’s actual water deliveries. <br />Centennial Lease <br /> Aggregate conveyed water rights in exchange for a perpetual lease of augmentation water in <br />an agreement with Centennial Water and Sanitation District in 1996. The agreement requires <br />Centennial to provide Aggregate with 30 acre-feet of fully consumable water each year. The rate of