Bay Meadows and Pacific Shores


Bay Meadows and Pacific Shores
 
Contract Amount: $5,633,371.00                  Final Amount: $5,832,330.10
 
Project Duration: August 31, 2015- 12/31/2016; Warranty period from 12/31/16-12/31/2017
 
Location: Lake Earl Dr. and Kellogg Dr. to Tell Blvd. in Crescent City, CA
 
Owner(s)/Clients: Border Coast Regional Airport Authority, Federal Aviation Association (FAA)
 
Project Description:
Bay Meadows and Pacific Shores is one mitigation project that has two jobsites in Crescent City, CA. Both jobsites scope of work consisted of constructing wetland and environmental habitat improvements to mitigate impacts resulting from airport improvements at Jack McNamara airport. Work included grubbing, grading, planting and over 80,000 CY of excavation in saturated soils. Work also included salvaging and replacing host plants, removal of foreign trash and debris, establishing wetlands, placing Large Woody Debris, installing native road barriers, installing live stakes, and enhancing upland dune habitat. Control of water during construction included drilling well points, and installing pumps to pump the water to settling ponds. This allowed us to excavate the pond designated areas at Bay Meadows. We utilized clean water control measures by installing well points, sheet piling, bypass lines and pumping water from these designated areas back into the stream channel after they were isolated and filtered. Upon encountering nuisance water, we pumped the water to settling ponds with filter bags that are attached to the discharge lines in order to mitigate any sedimentation of the watershed. The extreme saturated conditions at Bay Meadows/Pacific Shores in Crescent City caused us to isolate the water and monitor our isolation methods to ensure compliance with the Coastal Commission permitting requirements for this project. On the Bay Meadows project site, after we completed the clearing and grubbing, we utilized the control of water measures listed above, to allow us to isolate the areas of work and not impact the wetland habitat. Once isolated, we excavated over 83,000 CY of saturated material in rough terrain to establish the desired ponds/habitats. Excavated material was transported to a separate location using off-highway trucks. In sensitive areas of the site, a LGP Mooroka was used to work around habitat sensitive areas. Excavation was done precisely and carefully to not impede on any of the surrounding sensitive areas. 21,700 LF of silt fence was installed to also ensure this. Large Woody Debris and wildlife snag structures were strategically placed and anchored in the pond areas to create habitat for endangered frogs. After excavation was complete, extensive revegetation began. These habitat enhancing methods included over 30 acres of hydro-seeding, planting over 14,000 plants and maintain all plants and seed for one year after the completion of construction, to ensure habitat success. For the Pacific Shores project site, we began the project by clearing and grubbing a substantial amount of material, and removing foreign trash and material from the future habitat areas. During clearing and grubbing, we removed large amounts of non-native plants, including scotchbroom, included in this removal, was application of herbicide to aide in the species not returning. We then began decommissioning old roads that had been abandoned in the1970’s. These road segments were turned into frog habitate by excavation and laying down bio fabrics. Excavation totaled over 18,000 CY of saturated soil. Each road segment included natural road barriers made from logs salvaged from the site, live willow stakes were installed in these logs. Similar to the Bay Meadows site, extensive revegetation took place, including planting over 8,000 plants. We maintained all plants through monitoring and irrigation for one year after planting. Work at Bay Meadows and Pacific Shores helped the habitat enhancement of Lake Earl.