Metro Canoga/Northern Extension Orange Line Environmental Investigations, Los Angeles, CA
Metro Canoga/Northern Extension Orange Line Environmental Investigations, Los Angeles, CA



Completion Date

2007 (ESA)

DYA Client


Project Description

The Metro Orange Line Extension extends four miles north from Canoga Station to the Chatsworth Station. This dedicated busway offers improvements to north/south mobility in the western San Fernando Valley by connecting activity centers along the corridor and connecting the Metro Orange Line with Amtrak and Metrolink.  Features include:

  • Four new stations and new platforms were added at Canoga Station
  • New bikeway and pedestrian path that runs parallel to the dedicated busway
  • Landscaping
  • New park-and-ride lot at Sherman Way Station
  • Additional parking at Chatsworth Station
  • Elevated bridge overcrossing of Lassen Street and the railroad tracks
  • Public art

Diaz•Yourman & Associates (DYA) completed a Phase I Hazardous Waste Environmental Site Assessment (ESA) in October 2007.  Potential environmental concerns included volatile organic compounds (VOC) in groundwater; underground storage tanks (UST) and leaking underground storage tanks (LUST); evidence of hazardous substances; unlabeled drums, and petroleum hydrocarbons observed at several locations within or adjacent to the project ROW during the site reconnaissance; and the potential presence of polychlorinated biphenyls (PCB), a wood preservative used in railroad ties, asbestos, lead, and arsenic from weed killer.  DYA recommended that Phase II surveys be performed.

Gary K. Gilbert, PE, GE – Project Manager (Environmental Portion)

V. R. (Nadesh) Nadeswaran, PE, GE – Geotechnical Principal

Our Services


  • Site and route evaluations
  • Geologic hazards
  • Seismic design
  • Site characterization
  • Subsurface drainage
  • Grading
  • Ground improvement
  • Slope stability
  • Foundations
  • Dynamic analyses
  • Pavements
  • Instrumentation


  • Material sources
  • Construction observation and testing
  • Verification of anticipated conditions
  • Evaluation of changed conditions
  • Foundation installation
  • Instrumentation
  • Claims evaluation


  • Site characterization
  • Remediation
  • Solid and liquid waste disposal
  • Landfill
  • Aerially Deposited Lead (ADL) Studies
  • Phase I Initial Site Assessments (ISA)
  • Phase II Hazardous Waste Studies
  • Sustainability


  • Forensic investigation
  • Litigation support

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