WATER

34th Through 37th Streets Storm Drainage
Location: Santa Cruz, California

Preparation of plans for storm drainage improvements for 34th through 37th Streets near East Cliff Drive. Design work included field surveys, coordinating with existing private improvements and working with the Santa Cruz County Public Works staff. The drainage improvements include surface drainage swales, storm drain inlets and pipes, and two outfall structures to Monterey Bay. The outfall structures required bore and drill construction. Engineering services included design and field surveys.

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Gibson Canyon Creek Realignment
Location: Vacaville, California

This project consists of the preparation of plans, specifications and drainage study for Gibson Canyon Creek the Putah South Canal and Paedon Road. The work included enlarging and stabilization of 1 mile of the creek to pass the developed 100 year flood.

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City of Rio Vista Seawall
Location: Rio Vista, California

The City of Rio Vista City Hall is adjacent to and has a finished floor elevation which is approximately 3.5 feet below the 100-year flood stage for the Sacramento River. We designed a seawall of reinforced concrete block, with pass through gates for low flow access to the river, to protect the City Hall and Police Complex. This involved construction in a very soft material with a lot of piping potential from the high river flows.

The wall was constructed and in place with the cells filled with concrete and topped out one day prior to an all time record high flow of the Sacramento River and the wall accomplished its goal with 6 inches of freeboard. Although a row of sandbags were added to take care of wave splash during the high flow period. Subsequently, one extra brick course was added for wave protection.

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Rolling Hills Detention
Location: Fairfield, California

On this project, we designed three detention ponds, outlet facilities and conveyance systems to mitigate runoff for development of 650 homes over natural conditions as the downstream system had inadequate capacity, analysis with HEC-2 and pond routings TR-55 were utilized in this study.

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Nut Tree - 72 Acre Drainage Analysis and Detention Pond Sizing
Location: Vacaville, California

This involved calculation of detention ponds for flow mitigation in the Vacaville area. Detention pond sizing was related to mitigation of developed flows versus natural flows.

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Fairfield Corporate Commons Detention Pond Sizing
Location: Fairfield, California

This project consists of the development of two, 14-acre foot detention/retention ponds to retain onsite the 100-year developed flows from a 180-acre industrial business park constructed adjacent to Dan Wilson Creek in Fairfield. The ponds were connected to Dan Wilson Creek with flapgates and allowed to drain to the creek with a metering flow through orifices. This allowed a continuous water level to be maintained in the ponds for aesthetic purposes while and a discharge of the normal peak flow from development while still providing protection of the site for the 100-year flood.

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San Juan Road Drainage and Pump Station
Location: Pajaro, California

This project provides for local drainage to a pumping station that discharges to the Pajaro River. Project plans and specifications include the drainage collection system, pump station with submersible drainage pumps, and provisions for discharge to the Pajaro River channel. Permits from the Corps of Engineers (404 Permit) and California Dept. of Fish and Game (1601 Stream Alteration Permit) were obtained for the planned construction.

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Fairfield Corporate Commons
Location: Fairfield, California

The project consists of the removal of a planned 180-acre industrial business park located adjacent to the Dan Wilson Creek in middle Solano County from the FEMA determined 100-year flood plain.

This work involved preparing a HEC-2 model from Dan Wilson Creek in the before and after conditions and processed through FEMA a LOMR (letter of map revision) in order to relieve the site from being in the flood plain and the mandatory flood insurance.

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FEMA LOMR Study
Location: Vallejo, California

This project is the analysis of three major drainage areas, flood plains through FEMA modifications through LOMR's or CLOMR's based on evaluation of improvements that have been installed by the Vallejo Sanitation and Flood Control District on these floodways. Additional work includes analysis based on proposed work to get a conditional letter of map revision (CLOMR).

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