What a Phase 1 ESA Doesn't Cover: The Operational Compliance Gap
A Phase 1 Environmental Site Assessment is the standard starting point for environmental due diligence in any business acquisition or commercial real estate transaction. It's well-established, widely understood, and often required by lenders. If you're acquiring an industrial or commercial facility in California, your broker and your attorney have almost certainly already arranged or recommended one.
But the Phase 1 has a defined scope, and that scope doesn't include the operational compliance programs that may apply to an industrial or commercial facility based on its operations. Most people involved in the transaction (buyers, brokers, attorneys) know exactly what a Phase 1 covers. Fewer are aware of what it leaves out: the programs, permits, training, and regulatory filings on the operational side, where post-close costs can accumulate quickly and quietly.
The familiar halfWhat a Phase 1 ESA Covers
The Phase 1 follows the ASTM E1527-21 standard. It evaluates the property for recognized environmental conditions, meaning evidence of contamination or conditions that could indicate contamination. The assessment reviews:
Historical land use through aerial photographs, Sanborn maps, city directories, and prior records to identify previous operations that may have contaminated the site. Regulatory database searches through federal and state environmental records (EPA, DTSC, the State Water Board, local agencies) to identify whether the property or nearby sites appear on lists of contaminated or regulated locations. A site reconnaissance to observe current conditions, storage practices, and physical indicators of environmental concern. Interviews with current owners, operators, or occupants about the property's history and any known environmental issues.
The missing halfWhat the Phase 1 Doesn't Tell You
The Phase 1 ESA doesn't evaluate whether the facility operating on the property is meeting California's EHS regulatory requirements. Specifically, it doesn't assess:
Two assessments, one complete pictureThe Bottom Line
The Phase 1 ESA tells you about the dirt under the building. A compliance gap assessment tells you whether the business on top of it has the EHS programs, permits, and training that California requires to be in place. We've reviewed facilities where the Phase 1 came back clean but the operational side had a dozen open compliance gaps, from unfiled CERS reports to missing safety programs.
If you close without both, you have a complete picture of one side of the equation and no picture of the other. The Phase 1 quantifies contamination risk. The compliance assessment quantifies operational risk: the programs that need building, the permits that need transferring, the training that needs updating, and the violations that need resolving. What acquirers should budget for on the compliance side →
They're complementary assessments performed by different firms for different purposes. Your Phase 1 ESA provider handles the property side. CDMS handles the operational compliance side.
CDMS provides EHS compliance due diligence, gap assessment, and ongoing compliance management services for industrial and commercial facilities throughout California. With 35+ years of field experience, we evaluate compliance posture across every applicable California regulatory program: Cal/OSHA, environmental permits, hazardous waste, training, and agency filings. We come to your facility, deliver clear findings, and handle what comes next.
Trusted throughout California
BSY started working with CDMS last year after our in-house EHS person departed the company. CDMS reviewed our existing operational permits as well as any additional Federal, State and Local regulations that could apply and helped us to create a comprehensive compliance calendar to track regulatory deadlines and submittal due dates. The CDMS team does an excellent job of tracking everything and can be relied upon to complete the forms accurately and assist with submittals, allowing me to focus on our business.