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Aggregate Industries - WCR, Inc. <br />Amendment No.l - Jerotumus Property <br />Permit # M-99-034 <br />Upon the recommendation of the Water Quality Control Division, I request that the Division of <br />Minerals and Geology request asite-specific review of the applicant's dischazge permit from the <br />Water Quality Control Division for consideration of past, current, and potential future ground- <br />water contamination from organic chemicals attributed to historical waste disposal practices at <br />the Rocky Mountain Arsenal. According to the Tri-County Health Department, the majority of <br />offpost contamination is found in the shallow, unconfined aquifer into which the applicant will <br />be mining. The Henderson area, among others, was identified as containing high levels of <br />diisopropyhnethylphosphonate (DIMP), a chemical unique to the Army's manufacture of GB <br />nerve gas, or Sarin. This class ofsemi-volatile organic compounds, though somewhat soluble, <br />tends to adsorb on soil particles. Given the known contaminant plume in this area, excavation <br />activities associated with removal of aggregate materials within the zone of water table <br />fluctuation will remobilize contaminants that had adsorbed on the subsurface alluvial materials. <br />_ This remobilization can produce an immediate threat to human health by ingestion of _ _ _ __ __ <br />contaminated drinking water supplies. The potential health impacts associated with <br />remobilization of known contaminants in this azea has not been reviewed by the Water Quality <br />Control Division. I request that the Division of Minerals and Geology request such a review <br />from the Water Quality Control Division prior to making a recommendation on this mining <br />application. <br />Sincerely, <br />~~~ <br />Karen Topper <br />Cc: Diana Glaser, WQCD <br />