Total Maximum Daily Load (TMDL) is used to determine the maximum amount of a pollutant that a water body may receive and still maintain water quality standards. The mainstem of Silver Creek from a point immediately below the Town of Ricos water supply diversion to the confluence with the Dolores River is included in the 2006 303(d) list for exceeding the Aquatic Life use standards for zinc and cadmium.
This report serves as an interim deliverable to the Interbasin Compact Process Basin Roundtables for both the Metro Roundtable and the South Platte Basin Roundtable. This report currently relies on the data developed as part of the Statewide Water Supply Initiative (SWSI).
This Air Quality Action Plan is the first step in implementing the CDOT Air Quality Policy Directive 1901. CDOT's air quality policy promotes a forward looking vision of sustainable fleet management to effectively control internal transportation emissions and guides public outreach and education to further the understanding of greenhouse gas (GHG) emissions and mobile source air toxics (MSATs). This Air Quality Action Plan outlines proactive strategies designed to reduce transportation related GHG, air toxics and other related pollutant emissions statewide, thereby reducing the need to negotiate such measures in an ad hoc manner. The Air Quality Action Plan targets program development encompassing transit and sustainable community development, multi-modal freight movement and efficiency, operational highway management, congestion and idling reduction, innovations in fueling, engine maintenance and monitoring, retrofits, and alternative vehicle technologies.
The purpose of this Public Participation Plan is twofold: (1) to establish ways for sharing knowledge about the chemical weapons disposal mission at Pueblo Chemical Depot; and (2) to allow members of the community surrounding the U.S. Army Pueblo Chemical Depot to communicate openly with the Department of Defense, Program Manager Assembled Chemical Weapons Alternatives the Army, Colorado Department of Public Health and Environment and the systems contractor, Bechtel National, Inc. about chemical weapons stockpile disposal. This document outlines specific public participation strategies for addressing these goals and for maintaining the Public Participation Plan as a flexible, "living" document that can adapt to evolving community needs and concerns.
This document enables counties and municipalities to prepare for and mitigate multiple hazards by integrating resilience and hazard mitigation principles into plans, codes, and standards related to land use and the built environment. This guide provides detailed, Colorado-specific information about how to assess a communitys risk level to hazards and how to implement numerous land use planning tools and strategies for reducing a communitys risk. This guide provides detailed descriptions of a range of land use planning mechanisms that can be used to reduce risk to hazards.
The Arkansas River drainage basin lies south and west of the town of Leadville. The listed segments on this 303(d) listed portion of the upper Arkansas account for 163 miles of the 1,450 mile length of river. Many tributaries flow into the Arkansas River including Lake Creek, Chalk Creek, and Evans Gulch, which are also listed on the 1998 303(d) list for elevated metal concentrations.
The Colorado Department of Public Health and the Environment (CDPHE) has identified Sanchez Reservoir in Costilla County as not supporting its designated uses due to the presence of elevated fish tissue concentrations of mercury that have resulted in Fish Consumption Advisories. Mercury concentrations at the levels observed present a significant health risk to persons who consume listed fish from the reservoir. Because Sanchez Reservoir does not support its designated uses, a Total Maximum Daily Load (TMDL) is required for mercury loading to the lake.
Storm water runoff is water from rain or snowmelt that does not immediately infiltrate into the ground, and instead flows through natural or man-made conveyance or storage systems. Stormwater runoff volume is greater in areas with high proportions of impervious surfaces (e.g., paved roads, buildings, parking lots, etc.). Runoff from areas where industrial activities are conducted can contain pollutants when facility practices allow exposure of industrial materials or activities to stormwater. To regulate the amount of pollutants entering Colorado Waters, the Colorado Water Quality Control Act mandates that certain types of industrial activities that discharge stormwater to state waters must obtain coverage under a Colorado Discharge Permit System (CDPS) permit issued by the Colorado Water Quality Control Division.
This report presents the information contained in the SWSI Report that is specific to the Yampa/White/Green Basin as a starting point for the Colorado Basin Roundtable to develop the needs assessment required by the Interbasin Compact Process.
The Colorado Department of Health and Environment (CDPHE) Water Quality Control Division is developing an approach to manage nutrients in Colorado waters. The primary driver for this effort has been an Environmental Protection Agency (EPA) directive to reduce nutrients in waters under jurisdiction of the federal Clean Water Act (CWA). The Division's proposal to control the discharge of nutrients relies largely on a technology-based control regulation that would establish effluent limits for both total phosphorus (TP) and total inorganic nitrogen (TIN) for many domestic and some nondomestic wastewater treatment facilities that become subject to the control regulation will have to invest in capital improvements and ongoing operation and maintenance (O&M) costs.
The Colorado Department of Public Health and the Environment (CDPHE) has identified McPhee & Narraguinnep Reservoirs as not supporting their designated uses due to the presence of elevated fish tissue concentrations of mercury that have resulted in Fish Consumption Advisories. Mercury concentrations at the levels observed present a significant health risk to persons who consume listed fish from the reservoirs. Because McPhee & Narraguinnep Reservoirs do not support their designated uses, a Total Maximum Daily Load (TMDL) is required for mercury loading to the reservoirs. The purpose of this TMDL is to provide an estimate of pollutant loading reductions needed to restore the classified uses of McPhee and Narraguinnep reservoirs. The U.S. Environmental Protection Agency (EPA), Region 8, is supporting CDPHE in the development of this TMDL.
