Our leadership in environmental planning is demonstrated in our emphasis on solutions to critical multiple disciplinary challenges, meeting our clients goals and responsibilities, and our ability to coordinate projects that obtain the necessary environmental permits.
CSW|ST2 completes the applications plus coordinates the preparation of all of the documents necessary to meet the requirements of the U.S. Army Corps of Engineers, U.S. Fish and Wildlife Service, National Marine Fisheries Service, U.S. Coast Guard, California Department of Fish and Game, State Historic Preservation Office, State Lands Commission, California Coastal Commission, Bay Conservation, and Development commission, as well as the local municipality. CSW|ST2 has the professional expertise to manage and coordinate the activities required to successfully obtain permits for both public and private projects.
Coordination with Regulatory Agencies
CSW|ST2 works with all agencies simultaneously since their requirements are different — and sometimes conflicting. We meet with environmental agencies and local jurisdictions to discuss design plans and environmental requirements, coordinate all of the activities performed by project environmental consultants, maintain contact with each environmental regulatory agency to insure that all requirements are being met, and prepare the design plans for habitat restoration, mitigation, bank stabilization, bulkheads, floodwalls, floating docks, piers, bridges, and other improvements for residential, commercial, industrial, and open space/park projects.
Native Habitat Creation and Restoration
CSW|ST2 prepares plans for the creation, restoration, and enhancement of native habitats along creeks, creek by-pass channels, rivers, and other water bodies. We prepare plans for sediment extraction, excavation of channels and alcoves, and placement of large woody debris in estuaries to increases the area and complexity of habitat for salmonids and other estuary dependent species. CSW|ST2 prepares native habitat restoration plans for projects when the natural resources have been degraded by previous industrial or agricultural activities. Restoration plans are also prepared when environmental permitting is required for development and redevelopment projects.
CSW|ST2 prepares design plans for stabilizing creek and river banks. Bank treatments include bank shaping and vegetative planting, brush mattresses, live crib walls, live stakes, revetments composed of logs, root wads and boulders, and vegetated geogrids. When long-term durability is needed for high flow velocities, width of the creek/river channel is restricted and there is threat to life or high value property, joint plantings in rip-rap may be used. We prepare hydrology and hydraulic studies to assist us in the determination of the appropriate bank stabilizing solution and the design of stream diversion facilities installed during the construction phase of a project.
CSW|ST2 designs bio engineering systems to stabilize stream banks. Bio engineering is a system of living plant material used as structural components to provide soil protection and reinforcement. CSW|ST2 designs plans for bank shaping and vegetative planting, brush mattresses, live crib walls, live stakes, revetments composed of logs, root wads and boulders, vegetated geogrids and other bio engineered systems. The woody vegetation derived from our bio engineering systems provides riparian habitats with greater functions and values, shade, cover for fish, an aesthetically-pleasing natural environment, and improved water quality.
Sometimes when large box culverts are installed under roadways for streams, the gradient may be too steep for migrating fish. In these situations, CSW|ST2 works with the California Department of Fish and Game, the local municipality and other environmental regulatory agencies to design fish ladders within the culvert. A series of little pools are created at incremental elevations to allow fish to pass through the culvert and continue their migration along a stream. The fish ladders are made of concrete, the same material as the culvert. CSW|ST2 also designs fish ladders within the natural stream bed using natural materials.
Creek Bypass Channels
To prevent flooding along a creek and protect adjacent properties, CSW|ST2 designs bypass channels. During major rain events, high creek flows are diverted into a side channel that slows the flow, allows water in the main creek channel to recede so that the diverted flows can be returned to the primary channel without overtopping the banks. A natural channel is created with armor, e.g., rip-rap, at strategic points to prevent streambed erosion. Our design also includes weirs to provide scour pools in which water plants can take root and grow. Our bypass channels provide flood control and create a natural wetland environment.
CSW|ST2 works with Water Districts, Flood Control Districts, the National Parks Service and other agencies to control fine sediments at the source before the sediments enter threatened anadromous fisheries habitat along creeks and their tributaries. Design plans are prepared that specify erosion reduction measures to be implemented at targeted sources. Targeted erosive sources are selected to achieve the largest reduction for long-term yield of undesirable fine sediments entering a creek. Bio-engineered solutions are utilized to trap fine sediments on portions of roads, over-grazed pastures, and reforested areas.
CSW|ST2 prepares initial studies pursuant to the California Environmental Quality Act (Public Resources Code, Section 21000 et seq) and the CEQA Guidelines. An environmental checklist is completed that evaluates whether a project will have a potentially significant impact, less than significant impact with mitigation incorporated, less than significant impact, or no impact on various environmental factors. A determination is made whether a Negative Declaration or a Mitigated Negative Declaration will be prepared or whether an Environmental Impact Report (EIR) is required.