ASTM E1527-21
Phase I Environmental Site Assessment San Diego, CA
Records review, site reconnaissance and interviews that identify recognized environmental conditions before liability transfers to you.
A Phase I Environmental Site Assessment (ESA) is the standard first step of environmental due diligence for commercial real estate. It evaluates current and historical uses of a property and its surroundings to identify Recognized Environmental Conditions (RECs) — the presence or likely presence of hazardous substances or petroleum products.
Our Phase I reports follow the ASTM E1527-21 standard and the EPA All Appropriate Inquiries (AAI) rule, helping buyers, lenders and owners qualify for CERCLA landowner liability protections.
ESA Inspections provides phase i environmental site assessment services in San Diego and throughout Southern California — San Diego, Orange, Los Angeles, Riverside, San Bernardino, Ventura, Santa Barbara, Imperial, Kern and San Luis Obispo Counties.
What's included
- ✓Federal, state, tribal and local regulatory database review
- ✓Historical sources: aerial photographs, Sanborn fire insurance maps, city directories, topographic maps
- ✓Site reconnaissance of the property and adjoining parcels
- ✓Interviews with owners, occupants and local officials
- ✓Review of chain-of-title and environmental liens (user-provided)
- ✓Findings, opinions and conclusions identifying RECs, CRECs and HRECs
Who needs it
- Buyers of commercial, industrial and multifamily property
- Lenders underwriting acquisitions and refinances (SBA, conventional)
- Owners preparing for sale or redevelopment
- Developers of former agricultural or industrial land
Typical timeline
Typically 10–15 business days; rush delivery available on request.
Frequently asked questions
How long is a Phase I ESA valid?
Under ASTM E1527-21, a Phase I is considered viable for 180 days from the earliest key component date, and certain components can be updated for up to one year.
Does a Phase I include sampling?
No. A Phase I is a non-intrusive assessment. If RECs are identified, a Phase II ESA with soil, groundwater or soil-vapor sampling may be recommended.
Will my lender accept your report?
Reports are prepared to ASTM E1527-21 and can be formatted to lender and SBA requirements. Share your lender's scope and we will match it.
What does a Phase I ESA look for?
It looks for evidence of current or historical releases of hazardous substances or petroleum, including risks associated with the subject property and nearby sites.
Who is allowed to prepare a Phase I ESA?
The ASTM standard requires the work to be overseen and interpreted by an Environmental Professional who meets specified education, licensing and experience qualifications.
Is a site visit required?
Yes. Site reconnaissance is a core part of an ASTM E1527-21 assessment and is used to compare observed conditions with records and interviews.
What information should I provide?
Provide the property address and boundaries, transaction deadline, site contacts, prior environmental reports, known liens or use restrictions, and any lender-specific requirements.
What happens when a REC is identified?
The report explains why the condition qualifies as a REC and may recommend focused Phase II sampling to determine whether a release is present.
How a Phase I ESA investigation is completed
A Phase I ESA brings several lines of evidence together rather than relying on a single database search. The environmental professional reviews the property's present use, prior development, surrounding land uses and regulatory history, then compares those records with conditions observed during the site visit.
Historical research can reveal former operations that are no longer visible, such as service stations, dry cleaners, agricultural chemical storage, manufacturing, rail spurs or filled areas. The site reconnaissance looks for evidence such as tanks, drums, staining, distressed vegetation, drains, wells and hazardous-material storage.
- ✓Current and historical regulatory records
- ✓Historical aerials, maps and directories
- ✓Property and adjoining-site observations
- ✓Interviews and available agency records
Understanding RECs, CRECs and HRECs
The report classifies environmental concerns using ASTM terminology. A Recognized Environmental Condition, or REC, indicates the presence or likely presence of hazardous substances or petroleum under conditions that may require investigation. A Controlled REC has been addressed but remains subject to controls, while a Historical REC was resolved to applicable standards without continuing restrictions.
These classifications help buyers, lenders and counsel separate significant environmental risk from ordinary observations. If a REC is identified, the report explains the basis and may recommend targeted Phase II sampling rather than a broad, unfocused investigation.
What the property user must provide
ASTM E1527-21 assigns certain responsibilities to the party seeking liability protection. The user should disclose known environmental liens, activity and use limitations, specialized knowledge, commonly known information and any significant difference between the purchase price and fair market value.
ESA Inspections can coordinate with your lender, attorney and transaction team so the correct property boundaries, reliance parties and deadline appear in the scope. The final report documents findings, data gaps, opinions and conclusions in a format designed to support an informed acquisition or lending decision.
Service areas
Environmental services
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