I-215 Placentia Avenue Interchange

The Project.

Leighton provided environmental services during design phase and Quality Assurance materials testing services during construction. The overall project consists of construction of a new interchange including new on-and off-ramps and the widening of the Placentia Avenue Bridge over an existing railroad track (PVL Metrolink) along with other site improvements.

T.Y. Lin International  for RCTC


  • Environmental Services: Phase I & Phase II ESA
  • Aerially Deposited Lead Study
  • Quality Assurance Materials Testing During Construction

Project Fact:
This interchange is the first construction segment of the Mid County Parkway, a planned 16-mile corridor between Perris and San Jacinto, which will allow for greater transportation equity in western Riverside County.

The I-215 Placentia Avenue Interchange Project encompasses the first portion of the Mid County Parkway, a planned 16-mile corridor between Perris and San Jacinto that will reduce travel times and facilitate access to employment for residents and businesses of western Riverside County, thereby creating new economic opportunities.
The $42M project consisted of the construction of a new interchange including new on-and off-ramps, the widening of the Placentia Avenue Bridge, and the addition of new detention basins to reduce local street flooding. The widening portion of the work consisted of adding new lanes between Harvill Avenue and Indian Road, and new sidewalks, bicycle lanes, and a barrier-separated equestrian path along Placentia Avenue. These new features improve overall safety and traffic flow, provide drivers with a new entrance and exit to the interstate in Perris, and offer better connections to I-215, Route 79, Metrolink service, and Riverside Transit Agency service.

Leighton provided materials testing and environmental services for this project. Our materials testing team provided sampling and testing of structural concrete and pavement materials including JPCP, lean concrete, HMA and subgrade soils (CTM 202, 216, 217, 227, 231, 521, 540). Our team also performed testing of onsite soil stockpile generated from the construction of the Perris Valley Line to be used as embankment fill. Material plant, laboratory, and field materials sampling and testing was provided to ensure that concrete, hot mix asphalt, pavement, and embankment construction work conformed to Caltrans standards and specifications.

Because of the project site’s location on the I-215 and because Placentia Avenue crosses over the SCRRA railroad, our environmental team conducted a site investigation and Aerial Deposit Lead (ADL) survey for historical soil impacts from ADL and shallow historical soil impacts from total petroleum hydrocarbons (TPH), polynuclear aromatic hydrocarbons (PAHs), and metals. The site was also surveyed for asbestos and lead-based paint.