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SAND AND GRAVEL PRODUCTION OPERATIONS ' (INCLUDING ROCK AND STONE USED AS AGGREGATE) GENERAL PERMIT IN COLORADO RATIONALE COLORADO DISCRARCE PERMIT NUI~ER: COfi-500000 Sand and gravel production Is the Largest nonfuel mineral industry in the Onited States and 1s closely associated with the construcClon industry, which consumes over 90z of the sand and gravel output. Sand and gravel production operations are subject to the requirements of 25-8-101 et. seq., 1973 as amended. Regulations for the Colorado Discharge PermiC System, 5 CCR 1092-2 and Title 40-Part 436 of the Code of Federal Regulations (40 CFR 436) specify the wastewater discharge requirements for this Industry. Section 6.10.2 of the Colorado Discharge Permit System regulations provides far the issuance of General Permits where covered facilities: 1, are within prescribed geographic boundaries; 2, involve substantially the same type of operating conditions; 3. discharge the same type of waste; 4, require the same effluent limitations or operating conditions; 5. require similar monitoring; and, 6, are more appropriately controlled under a General Permit than individual permits. The issuance of a General Permit for sand and gravel production operations is iacended to simplify the regulatory program to make it mare manageable and effective and to promote a consistent permitting and enforcement posture with respect co these operations. Ravever, is is also for applicability for the normal facility and is not iacended to apply co an abnormal operation which will require an Individual permit. INDUSTRY DESCRIPTION Typically, the extraction of the raw material, sand and gravel, is via front-end loader, power shovel, or scraper. The extraction process may involve removal of the overburden and/or pit dewaceriag operations. KSne water pumpout may occur during periods of rainfall or when the groundwater Level teaches a predetermined height In a pit or Low-area.