Devil’s Slide Improvement Project Environmental Engineering Assistance

Client: California Department of Transportation

Prime Contractor:: Brown and Caldwell

Location: California State Highway 1 at Devil’s Slide, San Mateo County, California

Goals: To provide routine inspections of storm water and non-storm water treatment systems for construction activities at the Devil's Slide tunneling project which have the potential to impact water quality in the receiving waters (Pacific ) in respect to the projects' Storm Water Pollution Prevention Plan (SWPPP).

Project Description:

• Preparation of a comprehensive checklist for operations requiring inspection
• Inspection of storm water controls
• Evaluation of water treatment systems
• Monitoring shotcrete usage to determine conformance with regulatory conditions
• Weekly and monthly summary reporting
• Collaboration on annual reporting

Preparation: A review of all relevant water quality information - including permits and contractor submittals – related to the project was performed and an initial site visit was conducted to gather information needed to develop a comprehensive checklist for use during field inspections. In consultation with Caltrans, ADH also formulated a mechanism for tracking shotcrete quantities in conformance with the San Francisco Regional Water Quality Control Board criteria for onsite disposal.

Field Inspections and Monitoring: A review of all relevant water quality information - including permits and contractor submittals - related to the project was performed and an initial site visit was conducted to gather information needed to develop a comprehensive checklist for use during field inspections. In consultation with Caltrans, ADH also formulated a mechanism for tracking shotcrete quantities in conformance with the San Francisco Regional Water Quality Control Board's criteria for on-site disposal.

Reporting: Submittal of weekly inspection Technical Memoranda that summarize on-site activities, concerns, recommendations, brief weather forecast updates, and annotated photo-documentation. Collaboration with client on development of annual reports.