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6.4.7 EXHIBIT G — Water Information <br />17.) Page 5 of attachment G -1, the Groundwater Monitoring and Mitigation Plan states <br />once mining begins, monitoring will be conducted on a monthly to bi- monthly basis until <br />a quasi steady -state condition is reached. Please commit to monitoring the wells on a <br />monthly basis. <br />18.) In order to reduce the frequency of groundwater monitoring, Lafarge will need to <br />submit a Technical Revision to request this change with evidence to substantiate this <br />quasi steady—state condition is reached. <br />19.) Please commit to obtaining an approved Substitute Water Supply Plan and a Well <br />Permit from the Office of the State Engineer prior to exposing groundwater at the site. <br />20.) Please commit to submitting a copy of the Jones Ditch agreement prior to mining <br />and dewatering south of the Cache la Poudre River. Or if such an agreement cannot be <br />reached, Lafarge must submit and receive approval of a Technical Revision proving that <br />the mining /dewatering operation south of the Cache la Poudre River will not impact the <br />Jones Ditch. <br />21.) On page 8 of the Groundwater Modeling and Mitigation Plan (Attachment G -1), it <br />states "Lafarge has no responsibility to provide mitigation for wells that are constructed <br />after the permit is approved." This is not correct, in accordance with Rule 3.1.6 (1) the <br />operator is required to minimize disturbances to the prevailing hydrologic balance of the <br />affected land and of the surrounding area and to the quantity or quality of water in <br />surface and groundwater systems both during and after mining operations and during <br />reclamation. Given this, if the mining and reclamation operation impacts the ability of <br />surrounding land owners to legally use groundwater, Lafarge will be responsible for <br />mitigating these disturbances. Please remove this statement from the Groundwater <br />Modeling and Mitigation Plan (Attachment G -1) and submit a new copy. <br />22.) It states on page 10 of the "Groundwater Modeling Evaluation — Potential Effects <br />Due to Mining" document that "...water levels outside the Parsons Mine area within <br />approximately 700 feet of the north permit boundary may increase 1 to 2 feet due to <br />post- mining reclamation activities. Simulated heads generally increased by 4 to 5 feet <br />within areas where mine excavation are to be filled with overburden spoils." An <br />increase in ground water level such as this may negatively impact the surrounding land. <br />Please explain how Lafarge will maintain the prevailing hydrologic balance for the areas <br />surrounding the permit boundary after the site has been reclaimed. <br />