Projects - Civil Engineering Services

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Highway 101 Improvements Project

SHN provided project management, design, survey, and construction inspection services the City of Eureka's Highway 101 Beautification project. The project included:

Developing a Master Plan to enhance U.S. Highway 101 as it transects the City of Eureka, and allow pedestrian usage and safety.

Creating a sense of arrival at both ends of the city - gateway treatments combine trees along the streets, planted medians, and entry kiosks for directional signage.

Designing focal point treatment and traffic calming devices, including a variety of randomly spaced street trees, curb "bulb outs" on the downstream side of the intersections, brick paving and accents, benches, historical light standards, and information kiosks.

The project was funded by an Interstate Transportation Enhancement Act (ISTEA) grant to the City of Eureka.

In partnership with another firm SHN prepared a series of three EIRs for a gravel extraction, readimix, and asphalt concrete processing facility located on the Lower Eel River in Humboldt County, California. SHN identified significant impacts related to noise, traffic, air and water quality, aesthetics, and recreational use of the river.

The air quality assessment involved describing the air quality environmental setting, performing an air quality impact assessment using systems approach, identifying potential air contaminants according to physical or chemical class, and developing cost effective mitigation measures for sources with air quality impacts.

Impact assessment also addressed sensitive plants and animal species identified in a biological inventory. Mitigation and monitoring programs were designed to reduce impacts and measure mitigation effectiveness, with consideration of the client's business plan and annual operating budget.

The project also involved conducting an Annexation and Prezone EIR. SHN completed a project description for petroleum hydrocarbon contaminated soil and secondary materials recycling operation; assessed water and air quality impacts from the project; identified regulatory agency jurisdiction regarding proposed operation interfacing with the California Department of Toxic Substances Control, Alternative Technologies Division, California Integrated Waste Management Board, and California Regional Water Quality Control Board; and prescribed mitigation measures for environmental impacts.

Inner Channel Dock and Boardwalk Revitalization Project Permitting

SHN is providing permitting services for its proposed Inner Channel Dock and Boardwalk Revitalization Project. The project entails replacement and improvement of over 3,000 lineal feet of boardwalk located within the State of California coastal zone on the Eureka waterfront.

SHN will complete an EIR and prepare a Mitigation Plan. Agencies involved in permitting the work include: National Marine Fisheries Services, United States Fish and Wildlife Service, California Department of Fish and Game, Humboldt Bay Harbor Recreation and Resource Conservation District, Army Corps of Engineers, California Coastal Commission, and California Regional Water Quality Control Board. Permit applications will be accompanied by documentation of compliance with CEQA and required State and Federal coastal dependent use and water dependent use analyses as well as alternative analyses.

Small Boat Basin

SHN provided surveying, engineering, geotechnical, and permitting assistance services for the City's Small Boat Basin/Marina Rehabilitation Project, located on Humboldt Bay, Eureka, California.

Project design components included dock layout; dock access; RSP revetment; wave, wind, and current protection; boat ramp; Wharfinger building; a tenant facility building; and a public launch ramp restroom facility. Site Civil and Geotechnical Engineering included site grading and flat work, utilities, drainage, and waste pretreatment systems.

SHN prepared permit applications for the City's use in obtaining Army Corps of Engineers Section 10 and 404 permits, Harbor District permit, State Coastal Development permits, and National Pollution Discharge Elimination System (NPDES) and State Waste Discharge Requirements (WDRs) permits.

SHN also worked with the City to obtain $5 million in EDA grant funding for this project.

Biological Investigation and Wetlands Assessment

SHN conducted a botanical inventory and wetlands delineation, and a historical assessment of dike retreat for a 0.5 mile section of dike located between Jacobs Avenue and the Eureka Slough in Eureka.

The investigation was conducted in support of a Coastal Development Permit, and in compliance with a mitigation plan required by the U.S. Army Corps of Engineers related to unauthorized placement of fill in 1990. The historical study involved inspection of aerial photographs dating back to 1935, in order to recreate the history of dike retreat in this section.

The study indicated that the 1990 placement of fill had not impacted wetland resources beyond those impacted by the original construction of the dike during the early part of the century. As a result, the property owners' association was relieved of any requirement to mitigate for temporary loss of mudflat habitat as a result of the proposed re-armoring and reconstruction of the dike.

SHN is a member of a collaborative team of private and public agencies working to restore Bear Creek Meadows in Fall Rivers Mills, California. The project team includes the Department of Fish and Game, the Department of Water Quality Control Board, and 1,000 Springs Ranch.

Bear Creek, a tributary of Fall River, has been designated for erosion control and grading plans of the rerouting of approximately two miles of Bear Creek, which slipped out of its natural channels several years ago. These actions will serve to restore the health and function of the sensitive Fall River Ecosystem.

Floodplain damage will be minimized by installing sod-mats, native grasses, mulch, and plant plugs. Wildlife ponds will be excavated along the existing channel that will provide wetlands habitat to the area. The excavated soil, approximately 180,000 cubic yards, will be used to fill the existing channel to preserve the native materials of Bear Creek Meadow.

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