Restoration of damaged riparian or aquatic habitats should be done after bridge construction, maintenance, and demolition see Management Measure 6B for restoration and mitigation of wetlands and riparian areas.
Metropolitan Washington Council of Governments. Richman, T. Lichten, J. Worth, and B. EPA B Water is a precious resource in California, and maintaining its quality is of utmost importance to safeguard the health of the public and the environment.
Management Practices Limiting Disturbance The type and location of permanent storm water management practices should be considered when planning new development including highways, roads, and bridges, such that rights-of-way are sized to accommodate structural controls.
Highways and roads should be planned to minimize mileage through areas that might adversely affect sensitive areas, such as wetlands or estuaries. Wetlands that are within the right-of-way and cannot be avoided should be protected with the use of mitigation measures. Highway and road construction should be limited in sensitive areas, and highways should be sited so there is a sufficient setback distance between the highway right-of-way and any wetland or riparian areas.
Another consideration is tidal flows to wetlands; highways and rights-of-way should not restrict this flow. Mitigation will be required if wetlands, riparian areas, or estuaries are affected see Management Measure 6B for restoration and mitigation of wetlands and riparian areas. Site fingerprinting is a technique that can be used to protect vegetation and reduce erosion This practice limits clearing to areas that will be used for buildings, roads, and other infrastructure, leaving undisturbed areas that will be vegetated open space in the final plan.
Areas that will remain undisturbed need to be marked off and construction equipment and stockpiles must be excluded to protect the existing vegetation and prevent compaction or erosion. The advantages of site fingerprinting are that natural areas are protected and fewer costs for landscaping are incurred. A disadvantage is that equipment will need to be maneuvered around these protected areas, possibly leading to increased labor hours.
Bridges Bridges should be planned to minimize mileage and protect sensitive areas such as wetlands or estuaries. Setbacks should be used for river crossings during construction to minimize disturbance to the riparian area. Bridge construction can adversely impact water circulation in wetland areas, so allowances should be made for these impacts when designing bridges. Areas requiring excessive cut and fill and those that may be subject to subsidence, sink holes, landsides, rock outcropping, and highly erodible soils should be avoided when sitting bridge locations.
Runoff should be directed away from bridge decks and watercourses by diverting it toward land for treatment. This can be accomplished using drains that pipe water along the bridge edge to either side of the shore.
Recommended practices for treating bridge deck runoff include ponds, wetlands, infiltration basins and trenches, media filters, bioretention areas, vegetated swales, filter strips, and hydrodynamic devices. The use of scupper drains should be restricted on bridges less than feet long and on bridges crossing sensitive areas. Highways and Roads Disconnect impervious surfaces by eliminated curbs when local development codes permit to allow highway and road runoff to be filtered through vegetated shoulders and medians.
Eliminating curbs also increases infiltration to ground water. If eliminating curbs is not possible, curbs can be designed with breaks to direct runoff to vegetated surfaces. Care must be taken to ensure that the curb breaks do not receive so much runoff that vegetated infiltration areas are eroded. Storm water control structures should be designed so that the storm water does not run directly to receiving waters.
This chapter identifies Caltrans' cultural resources policies and directs all units of the Department to follow these policies. Chapter 1 also describes the organization, roles and responsibilities, and staffing requirements that Caltrans uses to manage cultural resources.
This agreement is included as Exhibit 1. Chapter 2 contains instructions for processing cultural resources documents in compliance with federal and state laws. Parallel segments for federal projects and for state-only projects describe pertinent legislation and compliance procedures, including identification, evaluation, and mitigation. The chapter discusses the types of reports required to document that cultural resources have been considered in Caltrans project planning.
Chapter 4 discusses the process and procedures for identifying cultural resources within the project area. The chapter describes the types of cultural resources that Caltrans is expected to identify and the appropriate sequence of steps to follow for determining whether recordation and evaluation would be necessary.
It covers such topics as defining an Area of Potential Effects, background or pre-field research, initial archaeological and reconnaissance surveys. The final section in the chapter offers guidance for requesting the appropriate specialists to evaluate cultural resources that were identified in the initial steps as warranting evaluation.
There are sections that summarize Caltrans archaeological policies and describe Caltrans procedures to define and evaluate archaeological sites, conduct data recovery, and prepare the pertinent technical reports.
The chapter provides information on construction monitoring, environmentally sensitive areas, archaeological permits, and archaeological procedures to follow in the event of post-review discoveries or for activities not related to projects.
Chapter 7 outlines Caltrans' methods and procedures for recording, evaluating, and treating buildings, bridges, structures, objects, non-archaeological sites, and districts composed of such structural features. There are sections that summarize Caltrans history and architectural history policies and that describe Caltrans procedures to evaluate built cultural resources, the relationship between research and evaluation, and step-by-step procedures for processing HRERs.
Chapter 7 offers mitigation options to be considered when historic properties may be affected by proposed transportation projects.
Lastly, the chapter also explains Caltrans' legal responsibility for maintaining its historic buildings and structures. Exhibit 2. Overview The consideration of cultural resources is a critical part of all phases of project development, construction, permitting, right of way, and maintenance activities. Statewide Campaigns caloes.
0コメント