Cagwin & Dorward - Recent Environmental Restoration & Erosion Control Projects

Sacramento River Bank Protection Project, Sacramento County
This riparian restoration project was installed and maintained by Cagwin & Dorward. Our key activities included:

Reintroducing and installing nearly 4,000 native plantings to protect the integrity of the Sacramento River and its tributaries
Conducting daily data collection, including surveys, photos and videos
Preparing annual reports summarizing all findings as well as success rates and mortality figures
Conducting physical and chemical soil tests and preparing documentation
Installing and maintaining container plants and pole cuttings in an area of high velocity water flows
Soil amending and weed control during the last five years to ensure survival of the native species

Wildhorse Ag Buffer/Greenbelt Project, Davis, Yolo County
This natural wildland area restoration project serves as a buffer zone and greenbelt for wildlife, as well as a recreational and educational resource for the city of Davis. The key to this project was the successful blend of a natural setting with a park-like atmosphere. Because the project was non-irrigated, it required careful planning and maintenance to achieve the desired results. Our key activities included:

Introducing various unique plant communities
Eradicating invasive and exotic plant species with minimal use of chemicals
Seeding and planting over 30 acres successfully; handling ongoing maintenance

Sycamore Crossing Mitigation/Revegetation Project, Hercules, CA
Cagwin and Dorward contracted with A.E. Schmidt Environmental, Inc. to perform the first phase of revegetation of over 14 acres of riparian and wetland as well as over five acres of riparian woodland. The permitting agencies were the U.S. Army Corps of Engineers and California Department of Fish and Game. The work was reviewed and approved by LSA Associates. Our key activities included:

On-site collection and installation of approximately 5,000 lineal feet of willow wattles
Planting over 1,100 plants, trees and grasses in augered holes
Installing 200 willow poles

Strawberry Creek Mitigation/Revegetation, Sacramento County
Cagwin & Dorward provided material and installation to LSA Associates for implementation of their plan. The scope of work included:

Layout and planting of almost 1,800 container-grown native trees and shrubs, including weed control mat and irrigation system
Installing a permanent automatic underground system, including utility connection and meter, some 16,000 feet of pipe, valves, controllers and approximately 3,500 emitters.

Grizzly Power Plant, Plumas County
Cagwin & Dorward subcontracted with Guy F. Atkinson Company for this revegetation project at the PG&E Hydro-Electric Power Plant. The permitting agency was the U.S. Forest Service, Quincy, California, and the grower was Cornflower Farms. The scope of work included:

Over 20,000 contract-grown, site controlled tubing containers (high altitude)
Restoration planting, seeding and mulching 45 acres of numerous scattered disturbed construction sites and rights of way. With a two growing season maintenance period, the final survival rate required was 70%
Locally collected and installed willow wattles, native straw/seed harvest and replanting, and sedge salvage and replant in permanent seep areas throughout the project

Hayward Marsh Revegetation
Cagwin & Dorward contracted with the Union Sanitary District, Hayward, California, to perform revegetation of emergent species, including California hardstem and alkali bulrush. The project's purpose was to provide biofiltration and habitat enhancement within reclaimed water effluent basins owned by the District and operated by the East Bay Regional Park District, Oakland, California. The scope of work included:

Planting corridors of 4,500 lineal feet measuring 20-feet wide, totaling just over two acres of marsh
Identifying, collecting, and transplanting 3,600 root masses (with dimensions from 12" to 48") by amphibious techniques from offsite sources
Installing over 9,000 feet of protective fence to enhance establishment
Biological inspection and reporting, heavy metals testing and aerial photography were provided by our sub-consultant, LSA Associates, Point Richmond, California. The owner's consultant for the project was Woodward Clyde Associates, Oakland, California.

State Route 152, Santa Clara County
As subcontractor to Granite Construction, Cagwin & Dorward performed revegetation and maintenance in floodway, riparian and upland areas for over 2 miles where freeway construction ran adjacent to Pacheco Creek. All Cagwin & Dorward activities were conducted in accordance with permits from the U.S. Army Corps of Engineers and California Department of Fish and Game, with a 100% survival requirement. Our key activities included:

Planting approximately 9,000 locally harvested willow cuttings and 1,200 container-grown natives propagated from jobsite sources
Installing irrigation systems utilizing over 60,000 feet of PVC pipe
Installing fabric weed mats, foliage protection screens and wood chip mulch.

Marine World/Mariner's Cove Mitigation, Vallejo
Cagwin & Dorward performed this freshwater habitat restoration as a subcontractor to Evans Brothers, San Ramon, California, who did the earthwork. The City of Vallejo's consultant was Demgen Aquatic Biology, Vallejo, California. The maintenance period was three years, and the survival rate was 100%. The permitting agencies were the U.S. Army Corps of Engineers and California Department of Fish and Game. Cornflower Farms and Tree of Life Nursery supplied the plants. The scope of work included:

Contract growing, planting in augured holes, mulching, and installing wire protection cages for over 1,800 riparian and upland native plants
Gypsum soil amendment for 12.5 acres with seasonal wetland seeding and mulching

Marin Lagoon, San Rafael
Cagwin & Dorward contracted with LSA Associates, Point Richmond, California, for this project, which included:

Layout and planting of over 2,000 1-gallon can size, owner-furnished native salt marsh species
Hydromulching 4.8 acres with locally collected species

State Highway Route 99, Chico
Cagwin & Dorward subcontracted with Baldwin Contracting Company, Marysville,
California, on this Caltrans freeway construction project, which included revegetation and restoration of vegetation. Work in and around Butte Creek was done under the authority of the California Department of Fish and Game and California Department of Water Resources Reclamation Board. Key activities included:

Soil preparation, seeding and mulching of 25.6 acres of California native wildflowers and upland grasses
Planting 1,600 state-furnished, container-grown native trees and shrubs
Site harvesting, preparation and planting of 1,600 native willow pole cuttings.

Squaw Valley Inn
California Regional Water Quality Control Board, Lahontan Region
Cagwin & Dorward constructed and monitored a series of artificial high-elevation wetlands as part of a major landscape project. All project runoff was directed through the wetlands to the satisfaction of the Lahontan Region of the California Regional Water Quality Control Board before discharge into Squaw Creek, a tributary of the Truckee River. Our key activities included:

Artificial wetland construction, including excavation and shaping, installation of gabion structures, PVC pond liner, wiers and structures for flow control, gravel, native boulders, bottom silt slurry, and wetland plants
A two-year operational guarantee, including monitoring biofiltration of snowmelt and all other site runoff. Biotechnical streambank stabilization was successfully established at the wetland outflow into Squaw Creek.

Laguna Creek Assessment District
As subcontractor to Granite Construction, Cagwin & Dorward installed irrigation and woodland revegetation planting on this City of Sacramento project. Woodland planting was maintained under the supervision of the City of Sacramento and its consultant, Zentner & Zentner, Sacramento. Our scope of work included:

Installing approximately 1,200 trees and 820 shrubs, mostly contract grown for Cagwin & Dorward, adjacent to vernal pools and the floodway; maintaining them for one year
Installing a completely automatic permanent irrigation system utilizing approximately 2,500 bubblers and over 50,000 feet of irrigation pipe.

State Route 132 - Tuolumne River Bridge
Cagwin & Dorward furnished and planted in the floodway and riverine portions of the highway right-of-way for this project. The grower was Leonard Coates Nursery, Watsonville, California. Our key activities included:

Harvesting, bundling, and planting local willow in "wattle" fashion
Planting and maintaining 1,000 custom-grown riparian native container plants to the satisfaction of the California Department of Fish and Game, #1601 permit.

Saratoga Creek
For this project, Cagwin & Dorward implemented revegetation and maintenance on a portion of Saratoga Creek in Santa Clara, California. Our client was the Santa Clara Valley Water District, Mr. Harvey Passanisi, (408) 265-2600 (contract #CO261). Inspection was performed by AKA Landscape Architects, Palo Alto, California. Our key activities included:

Furnishing and installing a permanent, fully automatic irrigation system
Installing 354 native trees and 970 native shrubs on approximately 5,600 lineal feet of creekbank, including layout, pit excavation, soil amendments, fertilizers, basin mulch, and initial weed eradication
Three years of maintenance, including irrigation control; weed, rodent, insect, and disease control; and replacement as required for 100% survival.

Forestville-Mirabel Revegetation (2 sites)
As prime contractor, Cagwin & Dorward furnished and installed native plants, which were contract-grown from site-harvested propagules by Circuit Riders Productions. This publicly bid project was subject to experience prerequisites, prevailing wages and contract bond requirements. Our key activities included:

Installing over 500 container plants with weed and browse control accessories and complete automatic drip irrigation systems
A three-year maintenance and monitoring obligation, including responsibility for compliance with CEQA documentation and protection of cultural resources.

Marin County Airport Gnoss Field
Cagwin & Dorward served as subcontractor to the airport improvement contractor on this federal aid project, which required full compliance with the Davis-Bacon Act plus all equal opportunity and minority business provisions of federal law. The owner's consultant, Prunuske Chatham, Inc., of Occidental, California, prepared the revegetation/mitigation plan and specifications. Our key activities included:

Delineation, soil protection, layout and planting of upland and wetland plants over the first phase of a one-acre transition zone between the airport and its adjacent environment
Installing weed mats and foliage protectors along with a temporary drip irrigation system utilized during the three-year maintenance and monitoring period. Success criteria included 75% survival rate after three years with 80% of the plant material showing vigorous health.

Police Facility Wetlands Mitigation Project, Redwood City
Cagwin & Dorward was prime contractor on this project, which included construction of approximately 10,000 square feet of bay (salt water) wetlands for Redwood City, California. EDAW, Inc. was the landscape architect and monitoring was conducted by Biosystems Analysis, Inc. The scope of work included:

Precision site grading.
Site-harvested transplanting of grindelia and salicornia
Installing 1,300 owner-furnished, container-grown natives
Seeding of both wet and dry herbaceous species
Providing temporary erosion control by installing 2,000 in. ft. of straw bale barriers
Installing a fully automatic irrigation system

R.A.S.S. #4, Concord Naval Weapons Station
Cagwin & Dorward served as subcontractor to Foster Wheeler Environmental Services on this project. Revegetation was performed following contaminated soils cleanup conducted by the general contractor for the U.S. Navy. P.R.C. Environmental Management, Inc., consultants to the Navy, performed inspection and monitoring duties along with H.T. Harvey & Associates. Our key activities included:

Restoration and revegetation of 9,100 square feet of saltwater/brackish wetlands and 116,000 square feet of upland, including supplying or transplanting saltgrass, tule, cattail and coyote bush
Drill seeding upland areas with native grass species, then applying straw mulch
Maintenance to establish coyote bush and other species, using hose application of water delivered by our tankers
Installing foliage protectors and weed control mats to ensure survival of coyote bush.

Los Gatos Creek at Route 85, Santa Clara County
Cagwin & Dorward created 8.8 acres of riparian habitat for this California Department of Transportation mitigation project, which was connected to adjacent freeway construction. The scope of work included:

Installing approximately 7,800 custom-grown containerized native plants with foliage protection and weed control mats
Harvesting and planting willow wattles and cuttings in some 1,700 locations
Installing a fully automatic bubbler irrigation system to deliver reclaimed water during the three-year establishment period
Trenching and burying about 66,000 feet of pipe, fed by a booster pump station and over 40 remote control valves with moisture sensors
Installing silt fences and sediment basins as temporary erosion control measures within the floodplain area of Los Gatos Creek to prevent sediment from entering the stream.

Hamilton Air Force Base, Landfill #26, Wetland Mitigation, Novato
Cagwin & Dorward served as subcontractor to Plant Reclamation, Inc. for this project. Contract-grown, containerized plants were supplied by Cornflower Farms and Circuit Rider Productions, including 32,000 tubelings of herbaceous species and 7,000 dee/tree pots of woody species. The site was enclosed by an 8-foot high animal exclusion fence. The required species survival rate was 80%. Cagwin & Dorward achieved a rate of over 90%. Our key activities included:

Revegetating and establishing 13 acres of seasonal and perennial wetland and scrub-shrub wetland
Creating and maintaining another 19 acres of upland shrub, tree, and grassland
Weed eradication with aerially applied aquatic herbicide, soil testing and preparation, layout, transport and installation of plants
Designing and installing a totally automatic overhead sprinkler irrigation system which operated throughout the two-growing-season establishment period
Seeding and mulching the entire upland area with native California grasses.

R.A.S.S. #1 and #2, U.S. Navy Concord Naval Weapons Station
Cagwin & Dorward served as subcontractor to Davy International, a division of Trafalgar House, Inc. for this project to revegetate two hazardous cleanup sites. Locally harvested cultivars were propogated and grown by our subcontractors, Circuit Rider Productions and LSA Nursery. Tidal and winter flood conditions required use of Cagwin & Dorward-owned marsh machinery. Strict military security measures governed the worksite. Success criteria required 70% or more survival of planted species. Our key activities included:

Wetlands revegetation of approximately 10 acres of saltwater marsh following excavation and backfill performed by the cleanup contractor.
Planting and establishing some 70,000 lower marsh, upper marsh and marsh plain containerized plants.

Environmental Restoration - Recent Projects