Eco Remediation Services

Eco remediation is excavation and site restoration work performed in or adjacent to ecologically sensitive environments — wetlands, riparian corridors, waterways, and coastal areas. The key difference from standard excavation is the regulatory framework and the ecological goals. Regular excavation is about moving material to prepare a site for construction. Eco remediation is about restoring natural function: re-establishing hydrology, removing invasive species, stabilizing streambanks, or rehabilitating habitat that has been degraded. The work is typically conducted under permits from CDFW, the Army Corps of Engineers, and/or the Regional Water Quality Control Board, with specific conditions governing timing, methods, and post-construction monitoring.

Almost certainly yes. In California, any work that disturbs the bed, bank, or channel of a river, stream, or lake typically requires a Streambed Alteration Agreement (SAA) from the California Department of Fish and Wildlife under Fish and Game Code Section 1602. Work in waters of the U.S. — including most wetlands — may also require Army Corps of Engineers authorization under Section 404 of the Clean Water Act, and a Section 401 Water Quality Certification from the Regional Water Quality Control Board. The specific permits required depend on the scope of work, the waterway type, and the regulatory jurisdiction. DW Excavation works alongside environmental consultants and project biologists who navigate this process — we bring the field capability and can provide input to the permit application, but we strongly recommend engaging qualified environmental professionals early on any sensitive site.

A CDFW Streambed Alteration Agreement authorizes specific work activities within the defined channel and adjacent riparian areas of rivers, streams, and lakes. The agreement specifies what work is permitted, the timing of that work (often restricted to dry-season windows to protect fish and wildlife), the methods that must be used, erosion and sediment controls that must be in place, and any restoration or mitigation requirements afterward. Non-compliance with SAA conditions can result in stop-work orders, restoration requirements, and enforcement actions. DW Excavation has experience working within SAA conditions and can provide the contractor-side documentation and compliance that agencies and project owners expect.

Work windows for in-water and riparian work in California are typically restricted to protect fish and wildlife during sensitive life stages. For most Central Coast streams with salmonid populations, in-channel work is generally limited to the low-flow period from approximately June 1 through October 31, though the specific window depends on the watercourse, species present, and regulatory determinations. Projects with rare plant or wildlife concerns may have additional seasonal restrictions. DW Excavation plans project schedules around these windows and coordinates with project biologists to confirm the applicable timing conditions before work begins.

Our wetlands restoration work includes restoring degraded wetland hydrology through regrading and plug installation, removing fill material placed in jurisdictional wetlands, establishing native vegetation communities, removing invasive species, and constructing created or enhanced wetland features for mitigation purposes. We also perform related upland buffer work including grading for stormwater infiltration, installation of bioretention features, and riparian revegetation. For mitigation projects that require post-construction performance monitoring, we can support the maintenance and monitoring period through vegetation management and site maintenance activities.

Yes. Fish passage projects typically involve removing or modifying barriers — undersized culverts, perched culverts, low-head dams, or grade control structures — that prevent or impede fish movement through a stream system. This work often requires coordination with CDFW, National Marine Fisheries Service (for salmonids), and the Army Corps of Engineers, and must be designed by a qualified engineer or hydrologist. DW Excavation provides the construction capability: culvert removal and replacement, channel grading, bank stabilization, and riparian revegetation work that follows the engineered design. We work as part of a project team rather than as a standalone design-build contractor for these projects.

The process starts with a site consultation. We'll visit the property to understand existing conditions, the scope of work being considered, and any agency correspondence or permits already in place. If permits haven't been initiated, we can connect you with qualified environmental consultants who handle the biological assessment and permit application process. Once permits are in place and the project scope is defined, we provide a construction estimate and schedule the work around the applicable seasonal windows. For projects already in the permit process, we're happy to review draft permit conditions and provide contractor input on feasibility and construction methods.

Yes. Public agency and municipal projects are a significant part of our eco remediation work — drainage channel maintenance, creek bank stabilization, riparian corridor restoration, and flood recovery projects coordinated with Sonoma County, Monterey County, and various city and special district agencies across the California Central Coast. These projects often have additional documentation and compliance requirements compared to private projects, and we have experience meeting those standards. We're also familiar with state and federal grant-funded restoration projects that come with specific reporting and documentation obligations.

Restored wetlands and waterways provide a range of benefits that extend well beyond the project site. Healthy wetlands filter agricultural and urban runoff before it reaches coastal waters, store floodwater during storm events, recharge groundwater, and provide habitat for birds, fish, amphibians, and invertebrates. Restored riparian corridors moderate stream temperature through shading (critical for cold-water fish like steelhead), stabilize banks to reduce erosion, and create wildlife movement corridors between habitat patches. On the California Central Coast — where the Russian River, Salinas River, and coastal lagoon systems are under significant pressure — these ecological functions are directly connected to fisheries productivity, water supply reliability, and community resilience to floods and droughts.

Project timelines vary considerably depending on scope, permit complexity, and seasonal work windows. A straightforward bank stabilization or invasive species removal project with existing permits might be completed in a few days. A larger wetland restoration or stream channel rehabilitation project could take several weeks of active construction, with the permit process adding months before work can begin. Post-construction monitoring requirements — typically one to five years for mitigation projects — extend the overall project lifecycle further. We can give you a realistic timeline estimate once we understand the scope and current permit status. If you're starting from scratch without permits, plan for six to eighteen months between initial agency consultation and construction completion for most regulated waterway projects.

Eco remediation work is performed on private property all the time — landowners with creeks, wetlands, or drainage channels on their land often have ongoing maintenance obligations or restoration opportunities. In fact, many of California's regulatory programs provide incentives for private landowners to voluntarily restore wetland and riparian habitats, including cost-share programs through resource conservation districts and watershed partnerships. The regulatory requirements apply based on the ecological and jurisdictional status of the area — not on ownership. Private property does not exempt work in regulated waterways or wetlands from permit requirements. DW Excavation works on both private and public land, and helps landowners understand their options and obligations before any work begins.