Caltrans Headquarters - Stormwater Quality Monitoring Program - Open/Gap Graded Asphalt Pavements (OGGAP) Stormwater Quality



The Open and/or Gap Graded Asphalt Pavements (OGGAP) Stormwater Quality Project pilot study was planned to evaluate stormwater runoff water quality by comparing open-graded and gap-graded pavements to that of conventional (dense-graded) pavements. The overall objective of this project was to investigate the impacts of various types of asphalt pavement on water quality from:
- Rubberized Hot Mix Asphalt - Open Graded (RHMA-O)
- Open-Graded Friction Course (OGFC)
- Dense-Graded Hot Mix Asphalt (DGHMA)
The project included eleven pilot study sites located statewide. Nine of the pilot study sites consisted of two paired monitoring stations each: one overlay test station, and one control station. For the paired sites, the test stations consisted of a freeway section with a relatively new pavement overlay (RHMA-O or OGFC), up to 5 years old. The test station was paired with a control station consisting of a nearby section of the same road, paved with conventional dense-graded pavement (DGHMA). An additional two pilot study sites consisted of one test station of recently applied dense-graded pavement.
For this water quality monitoring pilot study, ADH, as a subcontractor, was responsible for three paired site stations and one single control site station within Caltrans Districts 1 and 5. ADH monitored sites in Willits, Boonville, Salinas and Atascadero. After site selections were performed in 2006, up to twenty-one storm events have been monitored at each paired site.
- Site selection including thorough written and photographic documentation of proposed test and control sites throughout Caltrans districts 1 and 4
- Preparation of site selection technical memoranda
- Installation, maintenance and operation of automated, flow-weighted stormwater monitoring and sampling stations
- Remote instrument communication for data acquisition and programming control
- Storm event forecasting
- Storm event monitoring, including composite and grab sampling, field documentation, and sample handling
- Side study of field filtration for dissolved metals analysis
- Preparation of the post storm technical memoranda components
- Equipment demobilization
- Site decommissioning
- Maintenance of site vegetation
- Participation in semi-monthly project status meetings.
- Review and editorial comment for end of season monitoring reports
- Senior review of statistical analysis methods for the comprehensive 2009 – 2010 and 2010 – 2011 annual monitoring reports
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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