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Mr. Larry Oehler TETRA TECH RMC Adequacy Response M-2004-044 November 22, 2004 Page 18 of 20 Aggregate Industries will begin to implement one or more mitigation measures if mining and reclamation activity is determined to be a significant contributing factor to groundwater changes requiring mitigation. If, however, a subject well has not been put to beneficial use prior to mining, then Aggregate Industries would have no responsibility to provide mitigation. Mitigation measures may include, but are not limited to: - Cleaning a well to improve efficiency. - Providing an altemative source of water or purchasing additional water to support historic well use in terms of water quantity and quality. If needed, water quality parameters will be checked in affected wells to ensure alternative sources support the historic use. - Modifying a well to operate under lower groundwater conditions. This could include deepening existing wells or lowering the pumps. All work would be done at Aggregate Industries' expense with the exception of replacing equipment that was non-functional prior to mining. - If existing wells cannot be retrofitted or repaired: replacing the impacted well with a new replacement well. - Providing flood irrigation to address concerns over impacts to sub- irrigated lands adjacent to the site. • If a groundwater mitigation action is required, Aggregate Industries will notify the DMG of the condition, action taken and result. 4. Aggregate Industries must agree to include in its application, for a substitute water supply plan, all probable mounding of water predicted in the groundwater model. It is our understanding that this is not a requirement of the Temporary Substitute Water Supply Plan Application. Aggregate Industries will work with the State Engineer's Office (SEO) on all issues governed by that Agency. A temporary substitute water supply plan (TSSP) has been submitted to the SEO. 5. Aggregate Industries must add to Exhibit G Tetra Tech's recommendation that water Levels in the monitoring wells be measured monthly until extraction begins and quarterly until reclamation is complete and the DMG releases the financial warranty or until the Mined Land Reclamation Board releases A. I. from further monitoring responsibility. Aggregate Industries must agree to provide the results of the monitoring annually with the permit annual report. Aggregate agrees to provide the water level data collected from monitoring well sampling to the DMG with the annual report for the site. H:U919_019_01\MLRB\DMG Response\Is[ Adequacy Response to DMG I 1-5-04.doc