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To: Ric Pocius, Brian Peters From: Lane Wyatt Date: July 12, 1996 RE: Maryland Creek Ranch Conditional Ilse I'e~mit Per your request 1 have reviewed the Maryland ('reek donditional Usc Permit Application for general comments and conformity to the ,lreawide Water c )uality Alanagement Plan (208 Plan). The proposed gravel mining operation :rt Maryland t'reek Ranch is an approved use within the A-1 zoning district, it is the concrete plant, asphalt plant and processing plant which require the Conditional Use Permit. The application goes into some detail on the mining operation, however, provides very little informatics on the actual uses requiring this application. Therefore the following comments are general in nature. 1. The application indicates that there will be no new inq~acts, in general, because the operation is essentially being moved across the hi ~Itway. "Phis seems to imply that the existing sire will be fully reclaimed prior to commencing operation at the new site. 2. The existing agricultural ditches that are purposed to remain on site aRcr conversion to a mining operation should be protected rc~ith hernrs or other techniques to insure that they do not become conduits to carry sediment and other pollutants ofl'sire. Runoff drainage systems should he designed to contain the runoff on sits and utilize infiltration to prevent off site sedimentation problems. (see Policy 3, 208 Plan) 3, This facility, and the conditional uses contemplated, appear to require a CPDES stormwater permit for industrial activities. This permit should address many of the potential issues of concern such as protection from spillage of petrochemicals stored on site, dlisposal of wash water, operation and maintenance of any rnnotTtreatment systems, etc. If the facility is required by Colorado Department of Health to have this permit it should be a condition for approval. (see Policy 4, 208 Plan)