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Comment 5. The Operator has reported monitoring location CEM -005 has been abandoned due <br />to the collapse of the well. Monitoring location CEM -005 was the former <br />compliance point for the water monitoring program. Rule 3.1.7(6)(a) requires the <br />Operator to establish one or more points of compliance in order to evaluate the <br />protection afforded groundwater quality, comply with groundwater standards, or <br />to demonstrate compliance with permit conditions established by the Division to <br />protect groundwater quality. Please identify one or more compliance points to be <br />used in the groundwater monitoring plan. <br />Response: CEMEX will commit to reestablishing well CEM -005 as the point of compliance <br />for groundwater quality and this will replace CEM -001. The replacement well <br />will be in close proximity to the original CEM -005 location. Per communication <br />with DRMS CEMEX understands that this is an acceptable location for the <br />compliance well and meets all DRMS compliance well requirements. <br />If there are any questions regarding the above information Please contact Denise Arthur at <br />(303)517 -3043. <br />Best Regards, <br />Denise T Arthur, Ph.D. <br />Environmental Manager <br />Regarding the frequency of sampling, after numeric standards have been <br />established CEMEX proposes to sample for four quarters, and if the numeric <br />standard have not been exceeded, then the sampling frequency could be reduced <br />to semi - annually. <br />Page 6 of 6 <br />