6.2. ERMUSR 05-11-2004 - Laserfiche WebLink

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MAY.04 '2004 14 :35 651 644 9446 H R GREEN CO #6344 P.003/004 b. Analyze native groundwater and potable water recharge chemistry c. Determine 1 order estimate of quantity of water to be stored and recovered 2. Develop a testing plan to be used for Well#8. 3. Review testing plan with regulators (Minnesota Department of Health, Minnesota Department of Natural Resources, Minnesota Pollution Control Agency, United States Environmental Protection Agency), 4. Modify testing plan as appropriate, based on agency comments 5. Submit final testing plan to agencies for approval 6. Provide initial permitting support a. Provide 24 hours of effort towards gaining permit approval b. Target use of Well #8 as a pilot scale test of the ASR process The Intention of the Phase 1A work is to provide a preliminary assessment of the suitability of the ASR process and achieve agency approval to use Well#8 for pilot scale testing of the process. The effort described in the scope of services totals to $45,000 • Additional steps will be necessary in the future, as described below. Future Steps The Phase 1B work will provide additional analysis determining in more detail the suitability of the Mt. Simon aquifer for the ASR process. The proposed services for Phase 16 include the following: 1. Computer modeling of the aquifer's response to the ASR process 2. Additional geochemical analysis 3. Final permitting required for pilot scale testing 4. Pilot scale testing using Well #8 5. Cost analysis of ASR versus alternative methods of water supply Costs of the Phase 18 work are estimated to be $80,000 to $100,000, depending on whether or not the agencies require a monitoring/test well to be drilled. Phase 2 work will include final permitting work associated with the production ASR well and field testing of an existing well. The estimated engineering cost for this phase is $125,000, not Including design of the support systems that may be required (electrical, chemical feed, piping). Much of the support system work would not be required If an existing well was converted to ASR. The support system work required for a new ASR well is almost exactly the same as would be required for a new traditional production well. The Phase 2 work Is completed with one operational and permitted ASR production well. Benefits As we have previously discussed, the benefits of the ASR process are significant: 1. Ability to store filtered water underground to meet peak summer-time demands 2. Avoiding/delaying construction of additional treatment plants 3. Providing high quality water even during peak demands 4. Utilizing existing treatment plants more fully during fall, winter and spring seasons. 5. Providing additional system redundancy created by storing large quantities of treated water underground OMROJ1821480J ERMIJ No 8 1r c.Gre Q pany / •