Litter and Gross Solids Removal Devices
Description
Litter and gross solids removal devices (GSRDs) include physical/mechanical methods of removing litter, debris, and vegetation from stormwater runoff using various metal or fabric screening technologies. Screens provide treatment by preventing solids larger than the screen opening from passing through.Experience
Caltrans District 7 GSRD Pilot Program
The District 7 GSRDs Pilot Program was a multi-year study conducted in the Los Angeles Metropolitan Area to develop and evaluate the performance of non-proprietary devices that can capture gross solids (i.e., vegetative material and manufactured items made from paper, plastic, cardboard, glass, etc.). After a storm event, each GSRD was visually inspected and assessed for clogging, proper drainage, and material accumulation. After the rainy season, the weight and volume of the captured gross solids were measured. The performance of each GSRD was assessed by evaluating how well the GSRD met the criteria set by the Trash Total Maximum Daily Load (TMDL) and the safety and maintenance criteria set by Caltrans.
OWP Tasks
OWP Contacts: David Alderete
OWP Tasks
- Assisted in Study Planning
- Reviewed Designs of GSRDs
- Provided Review of Installation/Construction Activities
- Provided Monitoring Assistance
- Reviewed Data Assessment and Reporting
OWP Contacts: David Alderete
Caltrans District 12 State Route 73 Pilot Program — GSRDs
The District 12 State Route 73 Pilot Program was a multi-year field study conducted in Orange County. The primary objective was to assess the effectiveness of twenty-four pilot Best Management Practices (BMPs) for treating stormwater runoff from freeways. Included in the program were two types of Gross Solids Removal Devices (GSRDs). A GSRD is a non-proprietary device that can capture gross solids (i.e., vegetative material and manufactured items made from paper, plastic, cardboard, glass, etc.). After a storm event, each GSRD was visually inspected and assessed for clogging, proper drainage, and material accumulation. After the rainy season, the weight and volume of the captured gross solids were measured. The performance of each GSRD was assessed by evaluating how well the GSRD met the criteria set by the Trash Total Maximum Daily Load (TMDL) and the safety and maintenance criteria set by Caltrans.
OWP Tasks
OWP Contacts: David Alderete
OWP Tasks
- Assisted in Study Planning
- Reviewed Designs of GSRDs
- Provided Review of Installation/Construction Activities
- Provided Monitoring Assistance
- Reviewed Data Assessment and Reporting
OWP Contacts: David Alderete
Caltrans Litter Management Pilot Study
The LMPS was a two-year field study conducted in the Los Angeles Metropolitan Area to assess the effectiveness of structural and non-structural Best Management Practices (BMPs) to reduce litter entering or discharging from the Caltrans freeway storm drain system. The structural BMPs focused on modifying freeway drain inlets. The non-structural BMPs focused on increasing the frequency of both street sweeping and manual litter pick-up programs. For each BMP, litter and water quality samples were collected and characterized at both a test and a control area and then compared.
OWP Tasks
OWP Contacts: David Alderete
OWP Tasks
- Assisted in Study Planning
- Reviewed Designs of Modified Freeway Drain Inlets
- Provided Monitoring Assistance
- Reviewed Data Assessment and Reporting
OWP Contacts: David Alderete
