Surprise contamination is the worst kind an engineer can find on a project site, because by the time a backhoe turns it up, it has already blown the budget and wrecked the timeline. Engineers ask us all the time which type of impact is the most dangerous to discover. The honest answer is not petroleum, dry-cleaning solvent, or heavy metals — the things we run into most often — it is the problem nobody saw coming.
If an engineer is the one finding it, almost by definition it is a surprise — it should have been flagged by an environmental consultant well before the project start. The good news is that the screening tools that catch it early are fast, cheap, and the same first step behind every level of due diligence. They begin with an environmental record search — the database-and-history review that turns “surprise” into “known risk” before the first shovel hits the ground.
To keep the projects of our friends in the American Council of Engineering Companies (ACEC-Illinois) running smoothly, we offer the following advice.
How a Preliminary Environmental Screen Catches Contamination Early
Most engineering companies are familiar with Phase I ESAs. If one was completed before the project started, any contamination was likely identified and addressed. A Phase I ESA runs $2,200–$4,000 and takes two to three weeks because it includes an on-site visit and an ASTM E1527-21 assessment. If a Phase I ESA was not completed, environmental consultants have tricks up their sleeves to find almost all of the same contamination — quickly, and often far less expensively.
The environmental consultant has access to government databases and historical records that identify possible sources of contamination.
Were there gas tanks on the property in the 1920s?
Was the project site a former unauthorized landfill?
Was it an auto salvage yard in the 1950s?
The consultant runs these screening techniques — a desktop search across regulatory databases, city directories, aerial photos, and historic maps within a 1/4 mile radius of the site — often within 48 to 72 hours and for less than $500. If a sign of contamination surfaces, the consultant raises the red flag and works with the engineer on how to investigate it. For a leaner, database-only look you can start with a desktop risk assessment, which runs $250.
Environmental Screening Is Timeline Management
Knowing in advance about potential contamination protects project timelines. Have you ever heard the story about the backhoe operator who scraped an underground storage tank while putting in footings? It is not uncommon — and it is a mess that pulls in agencies like the Illinois Environmental Protection Agency (IEPA) and the Office of the State Fire Marshal (OSFM). When agencies get involved, time slows down and delivery dates stretch out.
Do environmental consultants have a crystal ball that sees everything? As much as we like to think so, we do not. We will not know if a farmer buried his trash quietly, or if an auto-repair shop buried drums of used oil. But we can quantify the potential risk so budgetary decisions get made before the dig, not during it.
It is far better to know about a problem this early, because removing underground storage tanks, excavating contaminated soil, or installing vapor barriers is expensive. A preliminary environmental screen runs less than $500, yet it can save thousands — and the real value is often the timeline it protects.
Here is the part engineers appreciate most: early knowledge lets the project become part of the solution. Parking lots, landscaping, and slab-on-grade construction can establish engineered barriers that eliminate exposure pathways, so contamination can stay in place under the new build. Using project features as remediation saves real money — but only if the problem is found early enough to alter the design. Discover it after the foundation is poured and those options are gone.
Environmental Screening Is Budget Management
Greater insight from environmental databases drives project costs down, not up. Consultants can map where clean soil can be reused on site or hauled off as Clean Construction or Demolition Debris (CCDD), which can run about 25% the cost of a Subtitle D landfill.
Concerns raised by a screen can be tested cheaply with ground-penetrating radar or electromagnetic surveys, both of which reveal long-forgotten underground piping and tanks. And in the right scenarios, we use hand augers instead of drill rigs to grab soil samples — far cheaper for quick, topical testing.
Every one of these products is built on the same database review. The $250 desktop screen, the $375–$415 database package, and the $850 Record Search with Risk Assessment draw from the same sources; they simply add interpretation as the risk climbs. CRE professionals who want those underlying data sources should review our rundown of environmental data resources for CRE professionals.
Why “No News” About Contamination Is the Best News
From first-hand experience, environmental consultants struggle a little with the fact that we rarely bring good news. At best, we deliver no news. At our worst, we deliver bad news.
The secret is this — if you engage us early enough, no news is the good news that saved you time and money, and bad news caught early is nothing more than a speed bump. It is only when contamination shows up by surprise, mid-construction, that it becomes the disaster everyone fears.
An A3E Environmental Screen in Action
On a recent infrastructure project in Elgin, Illinois (42.0354°N, 88.2826°W), a civil engineering firm asked A3 Environmental Consultants to screen a roadway-widening parcel before design was finalized. Our $250 environmental screening report flagged a former filling station one parcel away — an open state release within the 1/4 mile search radius that nobody on the team knew about. Reviewed by an A3E Professional Geologist (P.G.), the screen let the engineer reroute a storm sewer around the impacted soil and write the cleanup into the budget weeks before mobilization. That is the difference between contamination you plan for and contamination that ambushes you.
What to Expect
Pricing to screen for contamination ranges from $250 for a desktop screen to $2,200–$4,000 for a full Phase I ESA. The desktop products — the $250 screening report and the $375–$415 database package — turn around in 48 to 72 hours to five business days. An RSRA takes about five business days; a Phase I ESA runs two to three weeks because it adds the on-site visit. You receive a written report sized to the product, from a radius-map data package to a signed, ASTM-compliant assessment that satisfies lender and government requirements, including the SBA, HUD, and USDA.
Frequently Asked Questions
What is the worst kind of contamination for an engineer to discover?
The worst contamination to discover is the surprise kind — soil, groundwater, or vapor impacts that turn up mid-construction, after the budget and schedule are locked. The contaminant type matters less than the timing. Petroleum, solvents, and heavy metals are all manageable when you know about them in advance; any becomes a crisis when a backhoe finds it first.
How quickly can an environmental screen detect a problem on a project site?
A preliminary environmental screen for an engineering project is typically delivered in 48 to 72 hours for less than $500, and a leaner database-only desktop screen runs $250. Either reviews regulatory databases and historical records within a 1/4 mile radius of the site to flag documented issues on the property and its neighbors before ground is broken.
Does a record search find contamination the same way a Phase I ESA does?
A record search covers the database-and-history portion of a Phase I ESA without the on-site visit, so it catches most of the same documented findings at a fraction of the cost. A full Phase I ESA adds a site reconnaissance, interviews, and a professional opinion to the ASTM E1527-21 standard, and a screen can be escalated to one if it turns up a concern.
Can finding a problem early actually save money on a construction project?
Yes. Catching it during design lets you turn project features into the solution — parking lots, landscaping, and slabs can serve as engineered barriers, and clean soil can be reused or disposed of as CCDD at roughly a quarter of landfill cost. None of those savings are available once the foundation is poured.
Who should order an environmental screen before a project starts?
Any engineer, developer, or owner breaking ground without a recent Phase I ESA should order a preliminary screen. It is cheap insurance against the regulatory delays and emergency-excavation costs that follow when contamination is discovered after construction is underway.
Get Ahead of Contamination Before You Break Ground
Want to know whether contamination is hiding under your project site before the engineers find it the hard way? The fastest place to start is our $250 Environmental Screening Report — a 48-hour, flat-fee screen delivered nationwide across all 50 states. Our assessments meet the requirements of all commercial lenders and government agencies, including the SBA, HUD, and USDA. Call A3 Environmental Consultants at (888) 405-1742 or email Info@A3E.com.
We Fix Gnarly Environmental Problems
Reviewed by Alisa Allen, P.G., founder of A3 Environmental Consultants.
