CASE STUDY
CASE STUDY:
Vapor Intrusion Mitigation System
Ritz-Carlton Residences & J.W. Marriott at L.A. Live Los Angeles, CA
The Challenge:
One of the most high-profile mixed-use developments in Los Angeles:
- The Ritz-Carlton, Los Angeles
- JW Marriott Los Angeles L.A. LIVE
- Peacock Theater (formerly Nokia Theatre)
- Grammy Museum
- Retail components within L.A. LIVE
Complicating the project:
- Newly implemented Los Angeles methane regulations introduced late in the process
- Multiple permits required under a single mobilization window
- Massive schedule pressure on a landmark development
- High material and installation costs tied to the methane mitigation system
The solution:
Terra-Petra redesigned the methane mitigation approach to improve constructability, reduce installation time, and lower overall project cost.
Key actions:
- Specified an alternate LADBS-approved membrane system
- Reduced membrane installation duration by approximately 50%
- Negotiated system modifications with LADBS to reduce unnecessary infrastructure
- Achieved approved reductions of:
- ~40% of vent piping
- More than 50% of vertical vent risers
- Significant methane barrier membrane reductions
The outcome:
- Major reductions in labor, material, and installation costs
- Accelerated construction schedule through faster membrane installation
- Maintained compliance with newly enacted methane regulations
- Helped the ownership team open the project on schedule despite regulatory and construction complexity
the takeaway:
Complex projects don’t just need compliance—they need strategic problem solving under pressure. Terra Petra’s strength is finding ways to meet code requirements while reducing:
- Cost
- Schedule impact
- Installation complexity
That’s how major projects stay moving.
Project Details
52-Story High-Rise
3 Levels Below Grade
120,000 SF Footprint
service provided
Vapor Intrusion Mitigation System
Location
Rit-Carlton & J.W. Marriott
Los Angeles, CA
Download
Print Brochure
Download a printable pdf copy of this case study to reference offline when discussing your own development project