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Mitigation: The following practices will help minimize potential for noxious weed <br />infestations and improve long -term reclamation efforts after pit operations are complete: <br />❑ Implement a comprehensive weed management program to prevent the infestation <br />and spread of noxious weeds to surrounding areas. A written plan complete with <br />photographic references of potential species and adequate control methodologies <br />should be kept on site and implemented by the pit manager. <br />❑ Reseed soil stockpiles and interim reclamation areas with a drought - tolerant seed <br />mixture to provide a competitive vegetation base to prevent weed establishment. <br />❑ Provide a truck washout area to eliminate and contain non - native seeds <br />inadvertently brought into the site in the course of daily operations. <br />3.5 HAZARDOUS MATERIALS <br />Affected Environment: The gravel pit operations are subject to hazardous materials regulations <br />as part of water quality laws enforced by the CDPHE, and as such the property will be under <br />Stormwater Management Permit coverage, a segment of which deals specifically with hazardous <br />materials storage and handling. Hazardous materials include things such as wastewater, diesel <br />fuel, oil, grease, antifreeze, paint and paint thinners, herbicides, pesticides and chemical cleaning <br />compounds. A comprehensive Spill Prevention, Control and Countermeasure Plan (SPCC) will <br />be written as part of the SWMP permit process discussed in Section 3.2, which includes <br />installation of structural and non - structural Best Management Practices (BMPs) to minimize <br />potential for spillage from leaving the work site and entering watersheds. Inspection records and <br />corrective actions taken to BMPs must be kept onsite with the SWMP document and made <br />readily available during any State compliance inspection. <br />Environmental Consequences of Proposed Action: Gravel pit operations will require the storage <br />of a limited amount of hazardous materials including diesel fuel, motor oil, mechanical <br />lubricants and antifreeze to handle minor maintenance for equipment and vehicles used on the <br />site. However, regularly scheduled overhauls and significant mechanical repairs to trucks and <br />equipment will be conducted off -site in a professional mechanical shop, so potential for leaks <br />and spillage of these materials to occur on the site will be minimal. To prevent accidental <br />spillage, all hazardous agents such as oils, paints, greases, etc. will be stored inside a secondary <br />containment facility, which is anticipated to be a large metal container (mobile Conex Box). <br />Fuel will be stored in a 10,000 gallon tank with a lined secondary containment capable of <br />containing 110% of the tank capacity. Other large, stationary equipment on the site will include <br />a screening /washing plant, rock crusher, asphalt plant and concrete plant, all of which will have <br />secondary containment for potential fuel spills that will also contain 110% their respective tank <br />capacities. The SPCC document will contain detailed instructions for site personnel regarding <br />spill prevention, containment and reporting requirements as set forth by CDPHE regulations. <br />Given the SPCC permitting requirements imposed by the State to regulate such potential <br />occurrences, secondary containment systems that will be in place and the Proponent's plans to <br />Environmental Solutions, Inc. Page 20 of 30 March 09 <br />