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~" ~ " Aggregate Industries - WCR, Inc. <br />Amendment No.l - Jemnimus Property <br />Petmit # 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 ofpast, 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 Heahh Department, the majority of <br />offpost contamination is found in the shallow, unconfined aquifer into which the applicant will <br />be mining. The Henderson azea, among others, was identified as containing high levels of <br />diisopropylmethylphosphonate (DIMP), a chemical unique to the Army's manufacture of GB <br />nerve gas, or sazin. This class ofsemi-volatile orgaztic compounds, though somewhat soluble, <br />tends to adsorb on soil pazticles. Given the known contaminant plume in this azea, 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 heahh by ingestion of <br />contaminated drinking water supplies. The potential heahh impacts associated with <br />remobilization of known contaminants in this area 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, ~~p~t~ ~ <br />r \ ~h-~i ~~ - 0 ~ _ <br />Karen Topper <br />Cc: Diana Glaser, WQCD <br />