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Inc Mr. Kim Lawrence July 7, 1998 Page 5 Office stream depletion model was performed to determine the effect on the creek. A transmissivity of 50,000 gpd/foot and specific yield of 0.2 were used in the stream depletion analysis. Information from the Colorado Groundwater Circular No. 11 Aquifer Tests was used as the basis for the transmissivity and specific yield values. Shown below are the estimated stream depletions in St. Vrain Creek associated with Section 1 and Section 2 gravel mining operations: ESTIMATED STREAM DEPLETIONS (acre-feet) Mining an 1 Feb Mar A r p Ma Y un l lul Aug Sep Oct Nov Dec Total Section 1 1.61 1.60 1.59 1.58 1.59 1.55 1.54 1.56 1.59 1.59 1.60 1.61 19.00 1 and 2 1.27 1.27 1.28 1.29 1.30 1.30 1.27 1.24 1.24 1.25 1.25 1.25 15.21 Initially, Stromquist farms will release water to Boulder Creek below the Rural Ditch from Stromquist Pond Nos. 1 and 2 (see schematic of Stromquist Ponds in Appendix G) on behalf of Hall-Irwin according to the Section 1 mining depletion schedule. Boulder Creek flows into St. Vrain Creek approximately two miles west of I-2S just south of 119. Hall-Irwin will lease more water if actual mining depletions are larger than projected. A copy of a letter committing Stromquist Farms to providing replacement water to Hall-Irwin is included in Appendix H. Stromquist Ponds 1 through 5 were decreed for augmentation and replacement uses among other water uses in Case No. 88CW219. A copy of the decree is provided in Appendix I. Stromquist Ponds 1 and 2 have been lined and have met the lining specifications required in the decree as acknowledged by the State Engineer's Office (SEO) in.an October 4, 1995 letter from Jim Hall to Verna Sigg (Appendix J). Ponds 3 and 5 have also met the lining criteria of the SEO (see June 10, 1998 letter from Jim Hall to Verna Sigg, Appendix )). Stromquist Ponds 1 and 2 have been filled and currently have approximately 685 acre-feet in storage. Water will be pumped on a monthly basis or as requested by the Water Commissioner, measured and released to Boulder Creek in accordance with the Section 1 mining stream depletion schedule. 4. WELLS WITH/N 600 FEET Enclosed is the Colorado Division of Water Resources master well list (Appendix K) for wells located in the vicinity of the Hall-Irwin Shores gravel pit site. Three wells are located within 600 feet of the proposed mining limits (see Appendix L). Of the three wells located within 600 feet of the mining perimeter, two are owned by the Booth Land and Livestock Company and will not require a spacing consent statement. The remaining wel! is dry and Mr. Robert England has provided a "waiver of objection" letter (see Appendix M). 5. CONCLUS-ONS/RECOMMENDATIONS The consumptive use of water associated with Section 1 gravel mining during the first two years of mining is estimated to be 28.75 acre-feet per year. The consumptive use of water