The federal Clean Water Act requires that stormwater discharges from certain types of facilities be authorized under stormwater discharge permits. The goal of the stormwater permits program is to reduce the amount of pollutants entering streams, lakes and rivers as a result of runoff from residential, commercial and industrial areas. The original 1990 regulation covered municipal (i.e., publicly-owned) storm sewer systems for municipalities over 100,000 population. The regulation was expanded in 1999 to include smaller municipalities as well. This expansion of the program is referred to as Phase II.
The purpose of this document two fold. First, it is to provide a comprehensive background summary of the Eagle Mine Superfund Site, the remedial activities that have taken place to date and to show the commensurate improvement in water quality and load reduction that have occurred as a result of the remedial actions. Secondly, the purpose of this document is to analyze the available metals loading data to determine if newly proposed water quality standards based on EPAs Recalculation Guidance for zinc, copper and cadmium are attainable.
Study to determine how a wildfire could affect the water supply for the Golden Water Treatment Plant, located in Golden, Colorado, and developing treatment strategies that address wildfire-inflicted water quality changes.
This Environmental Assessment (EA) has been prepared for the Federal Boulevard Improvements Project. The stretch of Federal Boulevard in the Project Area is lined by commercial development with residential development behind the businesses. Federal Boulevard serves as a high travel-demand traffic corridor. This is a local-agency project sponsored by the City and County of Denver (CCD) in conjunction with CDOT and the Federal Highway Administration (FHWA) serving as joint lead agencies.
This update to the 2000 Nonpoint Management Program is intended to provide the near-term framework for program actions over the next five years. The actions identified in this document will lay the foundation to accomplish the long-term goals of the program.
The Colorado Department of Transportation (CDOT) initiated this US 24 PEL Study to examine existing transportation conditions and anticipated problem areas along the US 24 corridor in El Paso County between Powers Boulevard and the Town of Ramah. The study identified and screened a reasonable range of potential transportation improvements to develop an implementation plan for projects to meet the operational, safety, and capacity needs along the corridor. The study was conducted following Federal Highway Administration (FHWA) PEL guidance regarding the integration of transportation planning and the National Environmental Policy Act (NEPA) process, which encourages the use of planning studies to provide information for incorporation into future NEPA documents.
A terraced 1:240 scale model of the China Lake Naval Weapons Center was constructed to a resolution of one foot vertical increments and placed in the wind tunnel to determine the distances of lower flammability limit (LFL) for 1980, 40 cubic meter spills of Liquefied Natural Gas (LNG) under 4 wind speeds, 5 wind directions, and neutral flow conditions. Measurements of mean velocities, turbulence intensities, velocity spectra and correlations were performed over the model in the wind tunnel capable of simulating atmospheric phenomena. Data analysis has produced peak concentrations, contours of LFL, and time progressions of the plume ground level LFL.
The recent attention to ecology has led to many changes in road construction. One change has been in the emphasis on roadside planting or erosion control and highway beautification. In Colorado, many roads are being constructed with steep side slopes in both cuts and fills. These slopes are prone to both water and wind erosion, so it is important that vegetation be planted quickly to hold the topsoil in place. This not only makes the highway seem less of an incursion on the scenery, but also aids in the maintenance of roads, preventing culverts from being stopped up and aiding the drainage systems in working properly to prevent hazardous conditions to the people using the highway.
