Caltrans District 1 - Surface Water Quality Monitoring Program - Willits Bypass Project



As mandated by the Clean Water Act Section 401 permit approved by the North Coast Regional Water Quality Control Board, Caltrans implemented a yearlong baseline monitoring study to characterize the water quality and stream flow rates within the watershed of Outlet Creek in Little Lake Valley. For this project, 20 monitoring sites were designed and installed by ADH. Sites consisted of: creating safe access to the location; long-term deployment of continuous monitoring multi-parameter water quality sondes; fabrication of protective sonde casings; installation of water-level loggers housed in custom fabricated stilling wells; installation of staff gauges and establishment of benchmarks; fabrication of solar shields and installation of air temperature loggers; installation of rope transect lines across streams for current meter deployment during high-flow stream gauging.
ADH performed monthly collection of water quality samples, equipment maintenance/storm damage repairs, data downloading, sonde calibration, high stream flow measurements, and secured encroachment permits for county bridges. High stream flow measurements were performed using an acoustic doppler current profiler (ADCP) programmed and controlled by a wireless hand-held unit. ADH staff participated in eight storm event sampling events annually.
- Site selection
- Secure bridge access encroachment permits
- Design, procure materials and fabricate protective sonde casings, stilling wells, and solar radiation shields
- Install and maintain stilling wells and staff gauges, water quality meters, water level loggers and air temperature loggers
- Perform routine monthly water quality grab sampling
- Perform eight storm sampling events
- Perform high flow stream ratings
- Develop flow rating curves
- Prepare maintenance technical memoranda
- Quality assurance/quality control
- Spawning gravel monitoring and sampling
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Projects
- Stormwater and Surface Water Quality
- ACCWP Stormwater, Bioassessment, Instrumentation
- CCCWP Stormwater, Bioassessment, Instrumentation
- Clean Watersheds for a Clean Bay
- CalTrans SFOBB
- City of Trinidad - Storm Water Management Improvement Project
- Caltrans Willits
- CalTrans Storm Drain Inventory
- CalTrans LTDC
- CalTrans OGAPP
- Caltrans ORVTS
- CalTrans ASBS
- Gentry-Suisun Water Quality
- Summit Lake
- Santa Cruz Storm Water
- FedEx Storm Water
- Areas of Special Biological Significance Reference Stream Receiving Water Monitoring and Data Management
- Stormwater BMP Compliance
- Erosion & Sediment Control
- Coastal Oceanography and Sediment Sampling
- Miscellaneous