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• • • • • • • I• I• I• I• The lake resulting from the mining operations will be left in its natural state during and after the mining. Evaporation from the lake is expected to average approximately 30 inches per year. With the gravel mining operation there will be no irrigation of the 42.75 acres. Assuming a consumptive use of 15 inches per year. for irrigated drops, consumptive use under irrigated conditions J U D I T H L .. H A M I L T O N Consulting Geologist and Engineer GROUND - W A T E R A N D E N G I N E E R I N G G E O L O G Y 2951 Curtis Street • Denver, Colorado • 80205 • (303) 534-9007 July 16, 1981 Mr; Robert Fleming Quest Consulting sox 159 Commerce City, Colorado 80037 Dear Mr. Fleming: As you requested, I studied ground-water conditions relative to the proposed gravel mining o erations for the 42.75-acre site in the NW~SW~ Section 25 and NE~SE~ Section 26, T1S, R67W, Adams County, Colorado. No dewatering is proposed during the gravel mining operations. Approximately 1000 gallons per day, 6 days a week, will be util- ized for crushing, dust suppression, and other operations. This water use will require less than 1 acre-foot of water per year. The effect on nearby wells of use of this amount of water will be negligible. 4Yater for this use will be supplied from the lake resulting from the mining operations or from an existing well located 1350 north and 100 east of the SW corner of Section 25• The lake will be utilized as an alternate point of diversion for the well. The well is adjudicated for 2.888 cfs, equivalent to approximately 1300 gallons per minute. It is presently used to irrigate 40 acres in the E}NE~SE~ and E}SE~NE~ of Section 26. An agreement has been made with the well owner to supply up to 100 acre-feet per year from the well for water use on the subject pro- party. An application is in process for a change of use for the well from the present irrigation use to irrigation and commercial use. Make- up water for consumptive use for the crushing and dust suppression will be supplied through GASP or a similar program. All present a~equirements for supplying consumptive use will be met through this program.