Case Study: Vapor Intrusion Mitigation System - Ritz-Carlton Residences & J.W. Marriott at L.A. Live Los Angeles, CA
52-Story High-Rise | 3 Levels Below Grade | 120,000 SF Footprint
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
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
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
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.