2004-08-02_REVISION - M2000158 (3)

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ENVIRONMENT. INC. AUBUST 2, 2004 PAGE B Proof are the 12 new well drilled on the mine site since the permit was issued on August 10, 2001. • Recharge structures and test wells are not needed to ". maintain the integrity of the amendment's proposed slurry walls . The slurry wall will block the aquifer preventing the ground water from entering the dewatering area. A recharge structures is intended to reduce the impact dewatering would have on the area surrounding an unlined area that is being dewatered. We anticipate as much as a 4 foot increase in the water table outside the line area. This will increase the amount of water in the groundwater table, not reduce it, and protect the surrounding wells. As noted in response #5, a ditch will be installed and maintained along the south side of the liner to regulate the ground water table and divert his- toric groundwater flow that backs up along the liner to the river. ----------------------------------------------------------------- Stanley Odenbaugh Mr. Odenbaugh home is approximately 3300 feet east southeast of the Sharkey's Lake liner. There is no requirement to install the recharge structure and monitoring wells until/unless dewatering is.taking place. No dewatering has taking place to date. Responses are number below to correspond to the order presented in the letter. 1. Platte Sand & Gravel LLC is contracting with a construction company to install the wall. 2. The engineers hired to do the job. Eventually the Office of the State Engineer will inspect the lined area to confirm the reservoir areas are sealed per state standards. 3. Yes. 4. The Office of the S what criteria needs The contractor will was build and meets post a 1008 project its job. Late Engineer has guidelines that stipulate to be met for the liner to be approved. be responsible for guaranteeing the liner this criteria. Our contract requires they cost bond to assure that the liner will do 5. I can not answer this. 6. If he means the one on protecting their wells it remains unchanged. ---------------------------------------------------------------- Kristi Plutte Ms. Plutte's home is approximately 6125 feet southeast of the closest slurry wall. Ms. Plutte may not be aware of it, but as can be seen in the questions regarding well protection in her neighbors letters, an agreement and protection plan is in place to protect the surrounding wells. Dewatering of the reservoir area will be north of her property and there will be little or no impact to her