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08/05/09 TUE 16:18 FAb 970 356 1111 LL~O f~i013 <br />i. The applicant has agreed to provide an equalizing pipeline or similar means to eliminate <br />the predicated decline north and east of the slurry wall. The applicant should provide <br />danon9trative pmof that this pipeline will mitigate the groundwater decline. <br />ii. The applicant has indicated that additional water could be used to increase groundwater <br />levels north and east of the scurry. The applicant should provide demonstrative proof of <br />what water rights and how this will be accomplished. <br />iii. The applicant should consider reconfiguration ofthe slurry wall to mitigate the decline of <br />water levels m the north and east of dre slurry wall. <br />iv. Finally, the applicant has indicated that it is willing to relocate the AWC nursery stock or <br />conduct excavation to enable the continued sub-irrigation. <br />c. Al! of these mitigation alternatives are valid, however, the applicant and AWC need to agree on <br />specific mitigation treasures prior to the issuance of the final DMG permit. I believe that these <br />mitigation treasures should be indeprndent of the proposed triggers proposed by W WE. <br />d. The applicant should agree to a period of 24 months to establish a "pre-mining" baseline local <br />aquifer conditions that include the determination of the groundwater gradient in the vicinity of the <br />modeling area, the saturated thickness and the fluctuation of groundwater Levels In the vicinity of <br />the gravel mine. This pre-mining" aquiferbaseline should be used to refute WWE's water Icvel <br />decline trigger of 2 feet, W W E and CC should use the "pre-mining" data to re-calibrate the model <br />and aquifer predictions. <br />5. The proposed trigger mechanism is acceptable for all remaitting wells in the vicinity of the gravel mine. <br />However, the "pre-minces' data collection should be used to re-establish the trigger criteria. <br />Sincerely, <br />Forrest Leaf, <br />cc: Laura Coyle <br />Brad WindeU <br />Water tights • Hydrology • Hydraulics • Water Quality <br />L:LLealtCoyleVones Heit Pit Aquifer Letrcrl.doc <br />. 2 <br />