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Environmental Permits <br /> All construction sites require stormwater control <br /> measures. Construction sites that disturb 1 or <br /> more acres,with limited exceptions, require <br /> permit coverage under the Colorado Discharge <br /> Permit System/Stormwater Construction Permit. <br /> Construction sites that include dewatering may <br /> require a Dewatering Permit (refer to Colorado <br /> Department of Public Health and Environment's <br /> [CDPHE] Low Risk Discharge Guidance Document <br /> of Uncontaminated Groundwater to Land). <br /> These permits are administered by CDPHE.To <br /> download CDPHE's forms to obtain coverage <br /> under these permits visit: <br /> https://www.colorado.gov/pacific/cdphe/wq- <br /> construction-general-permits <br /> A SWMP is a requirement for all CDOT <br /> construction sites.The SWMP includes control <br /> measures to prevent pollution that results from <br /> construction and activities such as vehicle <br /> maintenance, hazardous waste storage, sanitary <br /> waste facilities, and fueling operations. <br /> Why Do We Need to Control Erosion and <br /> Sediment Losses from Construction <br /> Activities? <br /> Erosion control is desirable not only for <br /> environmental reasons but also for highway <br /> safety purposes. Uncontrolled erosion during <br /> highway construction, and subsequent <br /> sedimentation, could potentially cause adverse <br /> impacts on streams, damage to drainage vi <br />