Caltrans Headquarters - Storm Water Quality Monitoring Program - Phase II Storm Drain System Inventory

Roadside storm drain input BMP features are identified...
...and then immediately entered and stored in the field into computer using Caltrans SDSI Data Collection Tool, Arc Map, and a Microsoft Access database application.
Prime Contractor: 
Period of Performance: 
June, 2008 to September, 2008
Project Description: 

Under its NPDES Phase II permit Caltrans is required to report the locations of all points of storm water runoff from Caltrans freeways, off-ramps, maintenance facilities, and other properties statewide. The Phase II Storm Drain System Inventory (SDSI) project is a large GIS-based field data collection effort being performed by Caltrans to meet these reporting requirements. The objective of the SDSI is to identify and describe point source stormwater features and their attributes as completely and accurately as possible. ADH is supporting Caltrans as a subcontractor to Brown and Caldwell with this Task Order by performing field investigations as described below.

ADH Responsibilities: 

During inventory of each stretch of highway or Caltrans facility, field teams identified and described discharge points, outfalls, inlets, BMPs and their respective terminal discharge areas (TDA). A variety of data sources, including as-built drawings, aerial photos and GIS datasets, were used to provide additional verification of feature locations. Field teams identified the area along Caltrans Right of Way (ROW) where storm water leaves Caltrans property, establishing the discharge point for the TDA for each subject stretch of highway, and then identified the boundaries of the TDA itself. A field computer equipped with the Caltrans SDSI Data Collection Tool, Arc Map, and a Microsoft Access database application was employed to enter, store and manage the data collected, and to view aerial images and existing survey data. A GPS unit was incorporated with computer system and used to navigate and record the location of each inlet, outfall, BMP, discharge point and TDA. Using the GIS and GPS software, the attributes of each storm water feature/location visited (including digital photos, inventory information, GPS information, BMPs, and TDA boundaries) were digitally integrated into the aerial maps.