AMEC Geomatrix was awarded a three-year, $12 million contract to conduct statewide storm water monitoring and research. Under this contract, AMEC Geomatrix performed a variety of projects ranging from characterization of storm water runoff from highways, park-and-ride areas, and maintenance facilities to performance testing of various BMP technologies. One of the larger projects under this contract involved the selection, design, and installation of automated storm water monitoring systems at 24 sites located throughout California. These systems were designed to collect flow-weighted composite samples to assess event mean concentrations of pollutants in storm water runoff from various Caltrans facilities. In addition to the statewide storm water monitoring project, AMEC Geomatrix performed extensive performance monitoring on compost storm water filter treatment systems (CSFs). This project was performed over two wet seasons in response to an order issued by the Regional Water Quality Control Board. Storm water influent and effluent monitoring was performed to assess the effectiveness of the systems at removal of various pollutants of concern. Over the course of the contract, AMEC Geomatrix also performed water quality-related studies on non-vegetative erosion control products, sand filter treatment systems, and stabilized entrances/exits.