Environmental Engineering and Remediation
Underground Storage Tanks, Environmental Assessments, Compliance, Other

U.S. Environmental Protection Agency (U.S. EPA) Audit Preparation and Total Maximum Daily Load (TMDL) Assessment

Marine Corps Base (MCB) Camp Pendleton, Oceanside, CA

GCE was subcontracted to manage the implementation of specific requirements of the California Small Municipal Separate Storm Sewer System (MS4) Permit. The Small MS4 Permit required MCB Camp Pendleton to begin annual inspection and subsequent maintenance of the high priority stormwater infrastructure, by July 1, 2016. Due to lack of funding, the Base was about four years behind on complying with this requirement. MCB Camp Pendleton was due for an U.S. EPA Region 9 MS4 audit, and non-compliance with the stormwater requirements is the largest potential source of a Notice of Violation. The objective of this project was to bring the base back into compliance with the permit requirements before the audit.

A San Diego Regional Water Board audit of the MCB Camp Pendleton Stormwater Program identified the Base as a discharger responsible for compliance with indicator bacteria for the Twenty Beaches and Creeks Bacteria TMDL for the San Luis Rey Watershed, including monitoring and controlling its bacterial sources and coordinating efforts with Phase I permittees. In addition, the Phase II MS4 Stormwater Permit requires compliance with all applicable TMDL-based requirements. This project addressed receiving water monitoring and assessment needs.

Specific project work elements were:

  • Inspection of high priority storm drains,
  • High priority storm drain infrastructure cleaning,
  • Visual monitoring of MS4 discharges and BMP inspection,
  • Receiving water bacteria sampling and analysis, and
  • Preparing a Technical Memorandum presenting the monitoring results and assessment conclusions.