Laserfiche WebLink
<br />from alluvial aquifer drawdown to produce an approximate constituent concentration <br />within the dewatering flows. These concentrations are presented in Attachment N with <br />Drinking Water Maximum Contaminant Levels (MCLs) and Colorado Standards and <br />Methodologies for Surface Water. Attachment N illustrates that the calculated <br />concentrations of constituents in dewatering flows do not exceed any applicable <br />standards. Therefore, it is not anticipated that constituents originating at the RMA will <br />impact the proposed wetland areas at the site or, by virtue of the proposed lined storage <br />structure, potential uses of the water stored in the lined reservoir. <br />Comment 24. Indicate the status of the NPDES permit required from Colorado Department of <br />Public Health and Environment (CDPHE). <br />• Dewatering flows will be routed to previously permitted lands west of Old Brighton Road <br />where they will be discharged under an existing CDPS permit. Part II-4-1 of the existing <br />CDPS permit will require that the Water Quality Control Division (WQCD) be notified <br />of the added flow. If the WQCD confirms a potential for DIMP in the discharge, the <br />permit certification will be amended to require monitoring for DIMP in the discharge. <br />Should the monitoring suggest to the WQCD that a permit limitation is required, the <br />CDPS permit will be amended. <br />Responses to Comments Received from Dr. Harry Posey, April 11, 2000 <br />Comment 1. Identify the current stratigraphic and aerial distribution of contaminants from the <br />RMA. <br />• Please see response to Tom Schreiner Comment 20. <br />Comment 2. Provide a list of local contaminants from the RMA along with their regulatory <br />limits for drinking water, agricultural, and surface water uses. <br />• Please see response to Tom Schreiner Comment 20 and Attachment L and Attachment M. <br />Comment 3. Provide a hydrostratigraphic report showing what effects that pumping from the pit <br />area will have on local ground water, and the likelihood there is of drawing contaminants into the <br />pit or into the discharge water. <br />• Please see response to Tom Schreiner Comment 23 and Attachment N. Additional <br />hydrostratigraphic information in response to this comment is also contained in <br />Attachment P. <br />Responses to Comments Received from Dr. Harry Posey, Apri121, 2000 <br />Recommendation 1. Determine current contaminant levels of DIMP and tetrachloroethene <br />(TCLEE) in and around (within''/e mile) T2S, R67W, Section 10. <br />• Please see response to Tom Schreiner Comment 20 and Attachment L. <br />Page 9 <br />