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Holcim South Platte Combined SWSP April 14, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, Ft 6243 Page 19 of 37 <br /> Ditch headgate. The Applicant must notify the Water Commissioner at least 48 hours prior to <br /> making replacement deliveries at a location other than the Hite Treatment Facility. <br /> Thornton Lease <br /> Holcim has a perpetual lease of 10.53 acre-feet of fully consumable effluent from the City of <br /> Thornton, which will be released from the Metro Wastewater Treatment Plant at a rate of <br /> 0.035 cfs daily from November 1st through March 31st <br /> Fulton Ditch <br /> Holcim owns a total of 96 shares in the Fulton Ditch Company, consisting of 62 shares <br /> obtained from Cooley Gravel, 22 shares from CAMAS, 6 shares from C&tM Aggregates, and 6 <br /> shares from Hill &t Peterson. For 2024, Holcim intends to utilize their 62 Cooley Gravel and <br /> 22 CAMAS shares for replacement under this SWSP. (The 6 C&tM Aggregates shares and 6 Hill <br /> &t Peterson shares will be leased to others for irrigation purposes.) <br /> Prior to 1977, the 62 Cooley Gravel shares were used in two blocks: 30 of the shares were <br /> owned by the Montandon Trust and used for the irrigation of 48.7 acres, and 32 shares were <br /> owned by the Palombos and used for the irrigation of 31.1 acres. The shares were purchased <br /> by Walt Flanagan &t Company in 1977 and little is known about the use of the shares after <br /> that time. The historical consumptive use analysis utilized a parcel-specific analysis for the <br /> period of 1919 to 1977. A total of 40 shares were used on the Montandon parcel prior to <br /> 1964, with 10 shares being sold off in 1964. The historical consumptive use analysis assumed <br /> that the subject 30 shares irrigated 75% of the Montandon parcel (36.5 acres) prior to 1964 <br /> and 100% of the parcel (48.7 acres) from 1964 to 1977. The crop mix for the Montandon and <br /> Palombo parcels was assumed to reflect the mix of crops for the Fulton Ditch as a whole as <br /> identified in the 1956 CDSS irrigated lands GIS layer, consisting of 44% alfalfa, 26% corn, 15% <br /> dry beans, 13% pasture grass, 1% small grains, and 1% sugar beets. The Applicant previously <br /> utilized an assumed ditch loss of 20% and an irrigation efficiency of 65%. For the purposes of <br /> this SWSP, the Applicant has provided a revised analysis utilizing an assumed irrigation <br /> efficiency of 50%. Based on the above, the historical consumptive use of the 62 Cooley <br /> Gravel shares is estimated as 1 .5 acre-feet per share. Return flow obligations were allocated <br /> as 50% surface return flows and 50% subsurface return flows. <br /> Holcim has provided a memorandum dated December 29, 2022 with a historical consumptive <br /> use analysis of the 22 CAMAS shares. The historical consumptive use analysis utilized a <br /> parcel-specific analysis for the period of 1919 to 1971. The shares were purchased by Adams <br /> Aggregate in 1971 and little is known about the use of the shares after that time. A total of <br /> 45 shares were used on the CAMAS parcel during the study period to irrigate an average of <br /> 81.9 acres of alfalfa and pasture grass. The parcel contained primarily loam soils and an <br /> average water holding capacity of 1.5 inches per food was assumed. For the purposes of this <br />