2015-08-06_HYDROLOGY - M1996049 - Laserfiche WebLink

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Mr. Raul Passerini, P.E. June 24, 2015 Page 4 2016 the asphalt production is estimated at 117,749 tons which will result in a water consumption of 1.08 acre-feet (Table 6). Water Used for Dust Control (from well permit no. 51595-F) Based on water meter records for the period of 2009-2014 period it is estimated that the water used for dust control for 2015 and 2016 will total 3.1 acre-feet per year. Water used for dust control is considered 100 percent consumptive. Water Used for Drinking and Sanitary Facilities (from well permit nos. 51594-F and 51593-F) Based on water meter records for the period of 2009-2014 period it is estimated that the water used for indoor purposes for 2015 and 2016 will total 133,600 gallons. The consumptive use of water utilized for indoor purposes is estimated at 10 percent resulting in a total consumption of 0.04 acre-feet per year. Water Used for Landscape Irrigation (from well permit no. 51593-F) The consumptive use for landscape irrigation is estimated to be 1.64 acre-feet per year, which is based on the total water used (metered) for landscape irrigation. For purposes of this SWSP landscape irrigation is considered 100 percent consumptive. Landscape irrigation consists of 0.25 acres of lawn irrigated by sprinklers, and approximately 0.75 acres of trees watered by a drip irrigation system. The attached Table 7 displays the monthly distribution of dust control, vehicle washing, indoor uses and landscape irrigation. Lagged depletions to the Blue River were determined using the Glover technique based on the Analytical Stream Depletion Model (Schroeder, E.R. 1987, S.E.O. Ground Water Software Publication No. 1). The aquifer characteristics used in the model are based upon data in the USGS Circular No. 11 and they are: transmissivity (T) = 180,000 gallons per day per foot, specific yield (SY) = 0. 18, the distance from the point of depletion to the stream (area - weighted average of the distances from the centroid of each pond) to the stream = 1,482 feet, and the location of the parallel impermeable boundary was estimated to be 2,000 feet from the stream. The attached Tables B-1 and B-2 provide a summary of monthly consumptive uses, for 2015 and 2016 respectively. No phreatophyte credit has been applied to this plan. Replacement Water Replacement water to offset depletions is to be provided by consumptive use credits from the dry -up of 138 acres historically irrigated fields by four ditches within the subject property that have been removed from irrigation as a consequence of the gravel mining operations, and releases from storage from Green Mountain Reservoir and Dillon Reservoir. The four ditches used to provide dry -up credits include the Famine Creek Ditch, the Old Whetstone Sheep Creek Ditch, the South Rock Creek Ditch, and the McKay Ditch. In total, 138 acres of historically irrigated fields have been removed from irrigation as a consequence of the gravel mining operation at the Maryland Creek Ranch. An inspection of the dried-up lands was performed on August 20, 2014 by the District 36 Water Commissioner and Ms. M. Joanna Hopkins of Everist Materials, LLC. An affidavit (copy attached) submitted with the SWSP request, indicates that 100 percent of the 138 acres were dried-up and such lands will remain dried-up. A map of the dried-up lands associated with this SWSP is shown in the attached Figure A-5. The water rights associated with the four ditches are summarized in the table below: