Investigation | Remediation | Special Projects | Expedited Services | Permitting | Regulatory Expertise

Leader in Soil and Groundwater Treatment Technologies

PFAS Investigation and Remediation

Vapor Intrusion and Air Emissions

Extensive CERCLA and RCRA Experience

Water Treatment Processes and Optimization Technologies

Extensive Experience in Japan and Asia

Contaminated Site Management

Tri-S Environmental is a premier environmental management firm.

Based in Southern California. Projects worldwide.

Redevelopment Project on Former Oil Field Site with Waste Ponds and Above-Ground Storage Tanks, Los Angeles County

APRIL 30, 2024 – AUGUST 16, 2024: Summary Table of Client-Expert Communications

This table offers a concise overview of key communications during the specified period, capturing client directives for professional services (including environmental consulting, site investigations, and regulatory compliance), project progress reports, and related feedback.

Reference: 10-page table with 100 entries – LINK

JULY 22, 2024: Issuance of Notice of Intent for Regulatory Oversight – A Monumental Achievement

Under the leadership of Dr. Odencrantz, whose specialized expertise was pivotal in preparing the necessary documentation, the Regional Water Quality Control Board issued the Notice of Intent (NOI). This issuance reflects extensive staff coordination and an exceptional commitment of professional resources over dozens of hours.

Supporting documents:

i. 25 pages (dated June 27, 2024) – LINK

ii. 112 pages (dated July 2, 2024) – LINK

iii. 15 pages (dated July 8, 2024) – LINK

Key document: July 22, 2024 Notice of Intent Letter (3 pages): LINK

This milestone represents a hard-fought victory in navigating complex regulatory challenges.

SEPTEMBER 10, 2025: Water Board Issues Designation – Open Site Assessment

The Regional Water Quality Control Board officially designated the site as an Open Site Assessment under the Site Cleanup Program, Case No. 1660.

Places, Projects & Events

Groundwater contamination sites and groundwater water supply systems are complex and the manner in which they are managed are dependent on constantly changing technologies, regulations, unexpected per- and polyfluoroalkyl substances (PFAS) compounds, and water...

Keynote Address in Sri Lanka

Dr. Odencrantz was honored as the invited Keynote Speaker for the 3rd International Symposium on Advances in Civil and Environmental Engineering Practices for Sustainable Development. The subject of vapor phase transport of petroleum hydrocarbons and chlorinated...

Water Utility Evaluation

Tri-S Environmental performed a water utility segment evaluation for solar power augmentation for a start-up high gain solar company located in Silicon Valley, California. High gain solar combines high efficiency silicon cells and tracking that increases...

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Project Related

OSWER Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway From Subsurface Vapor Sources to Indoor Air

U.S. Environmental Protection Agency, Office of Solid Waste and Emergency Response Office of Solid Waste and Emergency Response Dr. Odencrantz is cited as authority on page 92 in the Final USEPA Guidance Document on Vapor Intrusion Sources to Indoor Air. Notable...

NH Supreme Court takes up Exxon appeal

By JEREMY BLACKMAN Monitor staff It was the largest such verdict in New Hampshire history, and Exxon, perhaps predictably, has been contesting it ever since. The battle appears to be finally nearing a head. Last week, Exxon’s attorneys asked the state Supreme Court to...

MTBE: The Gas Additive that is Hard to Remove

By Jason Reimers I barely remember leaded gasoline. All I really remember is being in the backseat of my mother’s Pinto and the question being posed: “Leaded or unleaded?” Lead is harmful to humans, so the federal Clean Air Act required that lead be phased out of...