An environmental site compliance audit is an on-the-ground inspection that verifies a facility’s day-to-day operations — hazardous materials handling, storage tanks, wastewater, PCB-containing equipment — match its environmental obligations. In the summer of 2026, A3 Environmental Consultants (A3E) paired Phase I Environmental Site Assessments with an environmental site compliance audit program covering 15 power generation facilities across Virginia, Ohio, Pennsylvania, New Hampshire, and Maryland. The $52,500 engagement was completed in roughly 90 days for private power generation companies, delivering a consistent, defensible compliance record across the entire portfolio. This project profile breaks down how the multi-state program was organized and what a portfolio audit looks like for your assets.
What Is an Environmental Site Compliance Audit?
Where a Phase I ESA asks “is this property contaminated from past use?”, an environmental site compliance audit asks “is this facility operating cleanly today?” The audit documents production processes, hazardous materials use, PCB-containing equipment, storage tanks, wastewater processes, and potential vapor intrusion or contaminant migration pathways. For operators of multiple facilities, it is the tool that turns fifteen separate compliance question marks into one comparable, portfolio-wide answer. If the Phase I side of the equation is new to you, our beginner’s guide to environmental site assessments covers the fundamentals.
Phase I ESAs Built on ASTM E1527-21
The Phase I Environmental Site Assessments were performed in general conformance with ASTM Practice E1527-21. The scope included a review of historical aerial photographs, topographic maps, city directories, and fire insurance maps; a search of federal, state, and additional environmental databases for the subject and surrounding properties; interviews with people knowledgeable of each site; and a site reconnaissance. It is the same process A3E applied at a single-site scale on the Corinth natural gas plant Phase 1 ESA — scaled here across an entire generating fleet. Curious what drives pricing at either scale? See our Phase 1 ESA cost guide.
Running an Environmental Site Compliance Audit at 15 Facilities
One of 15 power generation facilities audited across five states.
The audited facilities were fueled by natural gas, landfill gas, or diesel, of similar type and configuration — which is exactly what made a standardized audit valuable. For each facility, A3E scheduled and coordinated the site visit, reviewed available historical documentation before fieldwork, and conducted an in-person inspection. Site visits were grouped geographically to maximize efficiency across the five-state portfolio, and every aspect observed was documented with a photo log to support consistent, defensible field records.
Findings from each facility were compiled into a summary report — completed inventory checklist, photo documentation, and a summary metrics overview — delivered in draft and final form to support ongoing environmental compliance management across the portfolio. Any flagged condition, such as a suspect recognized environmental condition, was documented with the evidence needed to act on it.
Project Snapshot
- Client: Private power generation companies
- Locations: 15 facilities across Virginia, Ohio, Pennsylvania, New Hampshire, and Maryland
- Services: Phase I Environmental Site Assessments; environmental site compliance audits
- Key staff: Alisa Allen, M.S., P.G.; David McCoy, P.G.; Paul Marek, P.G.; Allison Beckett
- Duration: May–July 2026
- Value: $52,500
What to Expect From a Portfolio Compliance Audit
For a multi-site program, expect per-facility pricing to drop well below single-site rates — this 15-facility, five-state program averaged $3,500 per site including the Phase I ESA work. A portfolio of this size runs about 90 days end to end: two to three weeks of records review and scheduling, geographically clustered field visits, then draft and final reporting. Deliverables are a per-facility inventory checklist and photo log plus a portfolio-level metrics summary that lets environmental managers compare facilities at a glance and prioritize fixes. A3E is one of the few Chicagoland environmental firms that fields multi-state audit teams with licensed Professional Geologists on every crew.
Frequently Asked Questions
What does an environmental site compliance audit include?
A records review, an in-person facility inspection, and a photo-documented report covering hazardous materials use, storage tanks, PCB-containing equipment, wastewater processes, and potential contaminant migration pathways. The deliverable includes a completed inventory checklist and summary metrics for each facility.
How is a compliance audit different from a Phase I ESA?
A Phase I ESA evaluates historical contamination risk to protect a property transaction under CERCLA; a compliance audit evaluates current operations against environmental regulations. They answer different questions and are often most valuable together, as they were on this project.
How long does a multi-state audit program take?
This 15-facility, five-state program ran from May through July 2026 — about 90 days. Geographic grouping of site visits is the biggest schedule lever; scattered one-off visits can double the timeline.
Who should be on a multi-state audit team?
Licensed environmental professionals who can both inspect and interpret. A3E staffed this program with three Professional Geologists — Alisa Allen, David McCoy, and Paul Marek — supported by Allison Beckett, so field observations translated directly into defensible findings.
Audit Your Facility Portfolio
Whether it’s one plant or fifty, A3E delivers consistent, defensible environmental compliance documentation. Request a portfolio audit quote or call us at (888) 405-1742.
We Fix Gnarly Environmental Problems
Reviewed by Alisa Allen, M.S., P.G.
