Asbestos Clearance Testing Houston, TX — Post-Abatement PCM
Written pass/fail clearance letters from PCM fiber counts per NIOSH 7400, structured for OSHA and Texas DSHS compliance. 1-day rush turnaround for samples received before 2:00 PM CT, so the containment comes down and reoccupancy is never the thing waiting on the lab. Analyzed in-house at 10200 East Freeway, Houston TX 77029 — inside the Ship Channel corridor.
Why the clearance letter is the real deliverable
It Releases the Space
A written clearance report with a specific pass/fail determination is what lets occupants back in. Until it exists, the containment stays up and the project is not finished, however clean the space looks.
Every Hour Is Billable
A crew, an enclosure, negative air units and a client's reoccupancy date all wait on one number. Fast turnaround is not a convenience on a clearance job — it is the difference between one mobilisation and two.
It Is the Liability Record
The clearance letter is the document that gets produced years later if anyone asks whether the space was safe to hand back. A TX DSHS-licensed laboratory result with the criterion stated is what makes it defensible.
The Visual Comes First
Sampling before the space passes a clean visual inspection is the commonest cause of a failed clearance — and the most expensive, because the crew is standing by while the second round runs.
Where We Can Issue a Clearance Letter
We accept ship-in samples from anywhere in the United States — but clearance is the one asbestos service where the state your project sits in genuinely decides whether our report is usable. Read this before you plan an out-of-state clearance.
Texas and the Gulf Coast
Our home ground. Texas DSHS License #300529 covers PCM, so our clearance letters are accepted by DSHS. Houston metro courier pickup means samples can be moving within the hour.
AHERA Sets the Federal Floor
40 CFR 763.90 defines the federal clearance procedure for school response actions and permits PCM clearance by a laboratory in the AIHA Proficiency Analytical Testing program — a bar we meet.
Accredited to ISO/IEC 17025
NIOSH 7400 sits within our AIHA-LAP scope (LAP-101470) and our PJLA accreditation (137751), both ILAC-MRA signatories. The analysis itself is the same wherever the sample came from.
But the State Decides Acceptance
Technical competence and legal acceptance are two different things. A clearance letter is only as good as the regulator's willingness to accept the laboratory that issued it.
Clearance is the one service where the state matters most
Many states impose two separate requirements on clearance — a licensed laboratory and, often, a licensed person to collect the samples. Several jurisdictions will not accept a clearance report from a laboratory that does not hold their own credential, including New York, Pennsylvania (and the City of Philadelphia separately), Massachusetts, Vermont, Connecticut, Rhode Island, Maine, Virginia, West Virginia, Hawaii and Louisiana. In Texas, clearance samples must also be collected by a DSHS-licensed Air Monitoring Technician. We hold the Texas laboratory license (#300529). Before planning a clearance outside Texas, call us — we will tell you plainly whether we can issue a report your regulator will accept, rather than let you find out at the end of the job.
What Post-Abatement Clearance Testing Proves
Clearance testing is the last step of an abatement project. After the containment has been cleaned and passed a visual inspection, air samples are drawn inside the abated area and analyzed by phase contrast microscopy. The result is a fiber concentration and a written pass or fail determination against the criterion your project is held to.
It is not the same job as exposure monitoring. PCM exposure monitoring asks what a worker breathed during the work; clearance asks whether the space is fit to hand back. Different criterion, different sampling protocol, different report — even though both are PCM analysis under NIOSH 7400.
Most of our clearance volume comes from restoration and remediation contractors closing out a water, fire or mold loss alongside the abatement — see our dedicated restoration & remediation contractor testing program for the full scope of related mold, lead and IAQ clearance work.
- PCM clearance air sampling analyzed per NIOSH 7400
- Written clearance letter with an explicit pass/fail determination
- Criterion stated on the report — AHERA, TAHPR or your project specification
- Structured for OSHA and Texas DSHS compliance for commercial and industrial reoccupancy
- 1-day rush turnaround for samples received before 2:00 PM CT
- Priority resample handling for account holders on a failed clearance
Who does what
AGT Labs is an analytical laboratory. The clearance air samples are collected by your project monitor, consultant or licensed air-monitoring technician; we analyze them and issue the clearance letter from the result. We do not perform the visual inspection or the field sampling.
How Clearance Differs from Exposure Monitoring
Exposure monitoring measures the fiber concentration that workers breathe during active asbestos disturbance — it evaluates whether engineering controls and respiratory protection are adequate while work is underway. Clearance testing, by contrast, measures the residual airborne fiber concentration after all abatement work is complete, the containment has been cleaned, and a visual inspection has confirmed that no visible debris remains.
The two analyses use the same analytical method (NIOSH 7400 phase contrast microscopy) but answer fundamentally different questions. Exposure monitoring asks whether workers are protected during the job. Clearance testing asks whether the space is safe to return to normal occupancy. Because the questions differ, so do the sampling strategies: exposure monitoring uses personal breathing zone samples on workers performing the task, while clearance testing uses area samples positioned inside the decontaminated space at locations designed to represent the air a future occupant would breathe.
What the Clearance Letter Certifies
A clearance letter from AGT Labs certifies the airborne fiber concentration measured inside the abated area against the applicable regulatory or project-specific threshold. For OSHA-regulated projects, the criterion is less than 0.01 fibers per cubic centimeter (f/cc) — at or below the analytical limit of detection by PCM. For AHERA school projects, the criterion is that the average of five indoor samples does not exceed the average of five outdoor background samples, or does not exceed 0.01 f/cc, whichever is higher.
The letter includes the sample identification number, collection date and time, flow rate, sample volume, laboratory result in f/cc, the applicable standard, and a written pass or fail determination. Each clearance letter is reviewed and signed by an analyst meeting NIOSH 582 training requirements and released under our PJLA-accredited quality system.
When Asbestos Clearance Testing Is Required
Where the project specification and the regulation differ, the specification usually governs. Send it with the samples and we will report against the criterion it names.
EPA AHERA Clearance Requirements for School Buildings
EPA AHERA (Asbestos Hazard Emergency Response Act, 40 CFR Part 763, Subpart E) imposes the most detailed clearance requirements of any federal regulation. AHERA governs asbestos management in public and private K-12 school buildings and requires aggressive clearance air sampling after any response action that disturbs asbestos-containing material.
AHERA Sampling Requirements
Under AHERA, a minimum of five air samples must be collected inside the abatement area and five additional samples must be collected outside the building (or outside the abatement containment in a clean area of the building) to establish a background fiber concentration. All samples must be collected using aggressive air sampling techniques — meaning the air inside the containment must be actively agitated during the sampling period to simulate worst-case fiber release conditions.
AHERA requires a minimum sample volume of 1,199 liters per sample (approximately 1,200 liters), which at a flow rate of 10 liters per minute equals a minimum sampling duration of 2 hours per sample.
AHERA Clearance Criteria
The AHERA clearance criterion is met when the arithmetic mean of the five indoor sample concentrations does not exceed the arithmetic mean of the five outdoor (background) sample concentrations, or does not exceed 0.01 f/cc, whichever is higher. This two-part test means that if outdoor background concentrations are extremely low (below 0.01 f/cc), the indoor threshold remains at 0.01 f/cc. If outdoor concentrations happen to be elevated — due to construction activity, pollen, or other sources of background fibers — the indoor threshold rises to match, preventing a false failure caused by background conditions.
Each sample must be analyzed by a laboratory holding NVLAP accreditation for asbestos fiber analysis.
AHERA Documentation Requirements
AHERA requires that the clearance sampling results, the visual inspection record, and the air monitoring report be included in the school’s asbestos management plan. The management plan must be available for review by parents, teachers, and the public, and the local education agency must notify building occupants of the completed response action and its results.
Failure to comply with AHERA clearance requirements can result in EPA enforcement action, including fines of up to $44,539 per day per violation (adjusted for inflation as of 2024).
The Clearance Sequence — Visual Inspection Comes First
Skipping or rushing step two is the single most expensive mistake on a clearance job.
Abatement Complete
Work finished, but the enclosure and negative pressure stay up until clearance passes. Do not break containment early.
Visual Inspection
No debris, no residue, no visible dust. Air sampling before a clean visual is wasted money — settled dust gets counted regardless of its source.
Air Sampling
Inside the abated area, breathing-zone height, under aggressive conditions where the protocol calls for it. Minimum 1,200 L per sample.
PCM Analysis
Counted by TX DSHS-licensed microscopists in Houston per NIOSH 7400. 1-day rush available.
Clearance Letter
Fiber concentration, criterion applied, explicit pass/fail determination, analyst signature and QA sign-off. Containment comes down.
Step 1 — Final Cleaning by the Abatement Contractor
Before air samples are drawn, the abatement contractor must complete all cleaning procedures specified in the project work plan. This typically includes wet-wiping all surfaces within the containment — walls, ceilings, floors, structural members, pipes, and ducts — with amended water containing a surfactant. Surfaces are cleaned until no visible residue, dust, or debris remains.
The contractor then applies an encapsulant (lock-down agent) to all surfaces that were stripped or disturbed during the abatement. The encapsulant serves two purposes: it binds any remaining microscopic fibers to the substrate, and it provides a visible record that the surface has been treated. The contractor must allow the encapsulant to dry completely before requesting a visual inspection and clearance sampling.
Step 2 — Visual Inspection
The visual inspection is performed by the project monitor (or, where no monitor is retained, by the clearance sampling technician) before any air sampling equipment is deployed. The inspector examines every surface within the containment under adequate lighting, looking for any visible dust, debris, fiber, or residue. Particular attention is given to horizontal surfaces (beams, ledges, pipe tops), corners, recessed areas, electrical boxes, HVAC openings, and areas where encapsulant may have pooled or missed coverage.
If visible debris is found, the area fails the visual inspection and must be re-cleaned by the contractor before air sampling can begin. No air samples should be collected in an area that has not passed the visual — doing so wastes sampling resources and invalidates the clearance attempt.
Step 3 — Clearance Air Sampling
Once the area passes the visual inspection, clearance air samples are collected according to the sampling plan required by the applicable regulation. The number, placement, and volume of samples depend on whether the project follows OSHA, AHERA, or a project-specific specification. Sampling pumps are calibrated before and after the collection period using a primary standard, and flow rates are documented on the chain-of-custody form. Samples are sealed, labeled, and transported to AGT Labs for PCM analysis by NIOSH 7400.
Step 4 — Laboratory Analysis and Clearance Determination
AGT Labs analyzes clearance samples on a priority basis, with 1-day rush available for time-critical projects. Each sample is prepared using the acetone-triacetin clearing method, and fibers are counted under phase contrast microscopy at approximately 400× magnification following NIOSH 7400 A Rules. Results are reported in fibers per cubic centimeter (f/cc) and compared against the applicable clearance criterion.
If all samples meet the criterion, a clearance letter is issued confirming that the area has passed. If any sample exceeds the criterion, a fail notification is issued with the specific results, and the contractor must re-clean and request re-sampling.
Clearance Sampling Requirements
Clearance sampling differs from exposure monitoring in volume, placement and blank count. These are the parameters we analyze against. Cassette handling, calibration and field blanks are covered step by step in how to collect asbestos air samples for PCM.
Aggressive vs Non-Aggressive Clearance Sampling
It does not change the analysis, but it changes what the pass means — and it belongs in the letter.
Aggressive Sampling
Settled dust is deliberately disturbed before and during collection — typically a leaf blower directed at surfaces, then fans running for the duration of the sample. The logic is straightforward: a space that passes while dust is actively airborne will certainly pass under normal occupancy.
Non-Aggressive Sampling
Collection under still conditions with no deliberate disturbance. Produces lower fiber counts and is a materially weaker demonstration that the space is clean. Use it only where the project specification explicitly calls for it.
Recording It on the COC
Tell us which method was used. It does not change how we count the filter, but it goes in the clearance letter — a pass under aggressive conditions and a pass under still air are not the same claim, and the letter should say which one it is.
What Is Aggressive Air Sampling?
Aggressive air sampling (also called turbulent or disturbed air sampling) uses forced air circulation to agitate settled fibers from surfaces within the abated area during the sampling period. The standard aggressive sampling protocol uses leaf blowers, high-volume fans, or compressed air to direct airflow across all surfaces — walls, floors, ceilings, beams, pipes, and ductwork — for the duration of the sampling period.
The turbulence is intended to simulate worst-case conditions by dislodging any fibers that may have settled on surfaces after cleaning, ensuring that the clearance sample captures the maximum potential fiber release from the treated area. AHERA requires aggressive sampling for all school abatement clearance. Many project specifications for commercial and industrial buildings also require aggressive sampling regardless of the governing regulation.
What Is Non-Aggressive (Ambient) Air Sampling?
Non-aggressive air sampling (also called ambient or static sampling) collects air samples under calm conditions — without forced air circulation — representing the actual ambient fiber concentration in the abated area. Sampling pumps draw air at the specified flow rate, but no fans, blowers, or other devices are used to disturb settled dust or fibers. This method produces lower fiber counts than aggressive sampling because it does not resuspend settled material.
OSHA does not specify whether clearance sampling must be aggressive or non-aggressive, leaving it to the project specification. When a project spec is silent on sampling method, non-aggressive sampling is the default for OSHA-only projects, while AHERA projects always require aggressive sampling.
Which Method Should You Specify?
For school buildings under AHERA, aggressive sampling is mandatory — there is no alternative. For commercial, industrial, and residential projects regulated under OSHA or NESHAP, the project specification governs. If the specification does not address sampling methodology, discuss with your project monitor or industrial hygienist.
Aggressive sampling provides a higher level of assurance because it tests under worst-case conditions: if the area passes aggressive sampling, it will certainly pass under ambient conditions. For high-occupancy commercial spaces (offices, retail, healthcare facilities) or any project where liability concerns are elevated, AGT Labs recommends specifying aggressive sampling even when it is not required by regulation.
How the Pass/Fail Determination Is Made
Each sample yields a fiber concentration in f/cc from the count and the volume drawn. That is compared against the clearance criterion for the project.
| Context | PCM criterion | Source |
|---|---|---|
| AHERA school response actions | 0.01 f/cc | 40 CFR Part 763 Subpart E, Appendix A |
| Texas regulated projects | As set by TAHPR / TX DSHS | Confirm against the current rule and your project specification |
| Commercial specifications | Usually the AHERA figure, sometimes stricter | Project specification — send it with the samples |
What the clearance letter contains
The concentration for every sample, the analytical sensitivity achieved, the criterion applied, whether sampling was aggressive or non-aggressive, and an explicit pass/fail determination — carrying the analyst's signature, QA sign-off and the accreditation numbers the result rests on. Delivered through a secure portal, structured for OSHA and Texas DSHS compliance.
What Happens If Clearance Fails
A failed clearance is not a disaster, but it is a stop. The containment stays up, the area is re-cleaned, and the space is resampled. Two things are worth understanding before it happens.
PCM counts all fibers, not just asbestos. A fail in a building with fiberglass insulation, mineral wool or fresh drywall dust may reflect non-asbestos fibers entirely. If a clearance fails in a high-background environment, that is worth factoring into the re-clean decision.
Most failures trace back to the visual. Sampling before the space is genuinely clean is the commonest cause and the most expensive one, because the crew, the enclosure and the negative air units are all standing by while the second round runs.
- Containment stays up — do not break the enclosure on a fail
- Re-clean, then re-run the visual before resampling
- Resamples go to the front of the rush queue for account holders
- High-background buildings: consider what else is airborne before assuming asbestos
Identifying the Cause of Failure
A clearance failure does not necessarily mean the abatement was performed incorrectly — several factors can cause elevated fiber counts in clearance samples. The most common causes include incomplete cleaning of horizontal surfaces (beams, ledges, pipe tops, and recessed areas), inadequate encapsulant application leaving exposed substrate, containment breaches allowing fiber migration from adjacent undisturbed areas, overloaded filters from excessive dust (non-asbestos sources such as drywall compound, concrete dust, or ambient particulate), and equipment contamination from reusing cassettes or tubing from previous samples.
The project monitor should evaluate the likely cause before directing the contractor to re-clean, because re-cleaning will not resolve a failure caused by containment breach or equipment contamination.
Re-Cleaning and Re-Sampling Protocol
When a clearance sample fails, the standard protocol requires the abatement contractor to re-clean all surfaces within the containment using wet-wiping methods, reapply encapsulant to any areas where coverage is incomplete, and notify the project monitor when re-cleaning is complete. The project monitor then performs a second visual inspection and, upon passing, collects a new set of clearance samples.
The failed sample results remain in the project record — they are not discarded or replaced. The re-sample results are reported alongside the original results in the final clearance documentation. AGT Labs provides expedited turnaround for re-samples at no additional charge when the original samples were analyzed under a rush service agreement.
Post-Abatement Documentation Requirements
A passed clearance triggers a series of documentation requirements that extend beyond the laboratory report itself. The completeness of this documentation package directly affects the building owner’s regulatory compliance and liability exposure — and it affects the abatement contractor’s ability to demobilize, invoice, and close the project.
Required Documentation Package
A complete post-abatement documentation package typically includes the following components: the project notification filed with the applicable regulatory agency (NESHAP 10-day notification for regulated demolitions and renovations, or state equivalent); the project work plan or abatement specification; daily air monitoring logs from the work area and adjacent occupied spaces during the abatement; the visual inspection report with pass/fail determination and date; clearance air sampling chain-of-custody forms; the laboratory analytical report with NVLAP accreditation number; the clearance letter with pass/fail determination; waste manifests and landfill disposal receipts; and the project monitor’s final summary report.
Regulatory Record Retention
OSHA requires that exposure monitoring records (including clearance air sampling results) be retained for 30 years (29 CFR 1910.1001(m) and 1926.1101(n)). AHERA requires that school asbestos management plans — including all clearance documentation — be retained for the life of the building. NESHAP does not specify a retention period for clearance records, but the EPA recommends retaining all asbestos project documentation indefinitely.
Building owners should maintain these records in a readily accessible location and ensure they transfer with the property in the event of a sale.
Why Complete Documentation Matters
Incomplete clearance documentation creates regulatory and legal exposure for building owners. If a future renovation or demolition encounters asbestos that was supposedly removed in a prior abatement, the clearance records from that prior project become the critical evidence of what was done. Missing visual inspection reports, incomplete chain-of-custody forms, or analytical reports from non-NVLAP laboratories can invalidate the clearance determination and expose the owner to enforcement action, re-abatement costs, and tort liability.
AGT Labs includes all required documentation elements in every clearance report and retains analytical records in our LIMS for a minimum of 30 years.
Project Monitor Responsibilities in Clearance Testing
The project monitor (also called the third-party consultant, industrial hygienist, or owner’s representative) plays a critical role in asbestos clearance testing. In many jurisdictions and on most commercial abatement projects, the project monitor is an independent party — separate from both the building owner and the abatement contractor — retained to verify that the abatement was performed in accordance with the work plan, applicable regulations, and industry best practices.
The project monitor conducts or oversees the visual inspection that must precede clearance air sampling. This inspection is the monitor’s professional judgment call: they determine whether surfaces are adequately cleaned, whether encapsulant has been properly applied and is fully cured, whether all specified materials have been removed (or properly encapsulated in place), and whether the containment barriers are intact. A visual inspection failure means the contractor must re-clean before air sampling can proceed. The monitor’s visual inspection findings are documented in the final project report.
Air Sampling Oversight
The project monitor typically collects the clearance air samples or directly supervises their collection. They determine the number and placement of samples based on the applicable regulation and project specification, calibrate sampling pumps, record flow rates and sample times on the chain-of-custody form, and submit samples to the analytical laboratory.
In Texas, there is no state licensing requirement specifically for asbestos air monitors, but many owners and general contractors require the monitor to hold an AHERA project designer or project monitor certification, a Certified Industrial Hygienist (CIH) designation, or equivalent professional credentials.
Final Report and Clearance Documentation
After the laboratory results are received, the project monitor prepares the final clearance report, which includes the visual inspection findings, sample locations and placement rationale, sampling parameters (flow rates, volumes, durations), laboratory results and clearance determination, photographs of the abated area before and after cleaning, waste shipment records and disposal documentation, and a professional statement of compliance with the project work plan.
This report becomes part of the building’s permanent asbestos management record. For school buildings under AHERA, it must be filed with the management plan and retained for the life of the building.
Rush Clearance for Contractors on Schedule
Clearance is the one asbestos analysis where turnaround is the service. A crew, a containment and a client's reoccupancy date are all waiting on a number.
Pre-Labeled Clearance Kits
- 25 mm MCE cassettes, 0.8 µm, scoped to the specific job
- Field blank cassettes — minimum two per clearance batch
- Lot-certified, calibration-traceable media documentation
- Pre-numbered Asbestos COC with a clearance section
- Volume and placement reference card — 1,200 L, 4–5 ft
- Pre-paid UPS return shipping label (domestic)
Kits ship ahead to account holders scoped per job. Order with 5 business days notice: (713) 453-6090.
AGT Labs provides 1- to 4-day rush turnaround for asbestos clearance PCM analysis on time-critical projects, alongside 5-business-day standard service. We understand that clearance results directly control when the abatement contractor can break containment and demobilize — every hour of delay costs the contractor labor, equipment rental, and schedule penalties. Our rush service accepts samples until 2:00 PM (Central Time) for results by 5:00 PM the same business day. For projects requiring after-hours analysis, weekend service is available by arrangement with our laboratory manager.
Sampling media for clearance testing consists of 25 mm mixed cellulose ester (MCE) filter cassettes with extension cowls (used for aggressive sampling to increase the effective sample volume at higher flow rates) or standard 25 mm cassettes for non-aggressive sampling. AGT Labs supplies pre-assembled clearance sampling kits at no charge to clients with established accounts — kits include cassettes, chain-of-custody forms, field blank cassettes, and prepaid return shipping labels.
For contractors in the Houston metropolitan area, we offer same-day kit delivery and sample courier pickup. Kits are shipped within 24 hours of request to any location in the continental United States via FedEx Priority Overnight.
Standing Clearance Accounts
Contractors who clear regularly should not be re-quoting every job.
Volume Pricing & a Named Contact
Agreed rates across all clearance and PCM work, and a dedicated lab contact rather than the general line — someone who knows your jobs and your turnaround pattern.
Kits Shipped Ahead, Scoped Per Job
Pre-labeled clearance kits sized to the specific project, with the right blank count and a pre-numbered COC, sitting on your truck before the job starts.
Priority Rush — Including Resamples
1-day turnaround held for account holders, and resamples on a failed clearance go to the front of the queue rather than the back.
One Submission, Whole Survey
Pre-demolition surveys run on one submission — PLM asbestos alongside lead, PCB and mercury, one chain of custody.
Monitoring Through the Job
PCM personal and area monitoring during abatement from the same account, so the exposure record and the clearance letter come from one laboratory.
Ship Channel Courier
We are at 10200 East Freeway inside the Ship Channel corridor. Houston metro courier pickup means samples can be moving before your crew has broken for lunch.
Clearance Testing for Different Building Types
Clearance requirements and sampling strategies vary depending on the building type, occupancy classification, and governing regulation. Understanding these differences helps project managers plan sampling correctly the first time and avoid re-sampling delays.
K-12 School Buildings (AHERA)
School buildings are subject to the most stringent clearance requirements under federal law. AHERA mandates aggressive air sampling with a minimum of five indoor and five outdoor samples, analysis by a NVLAP-accredited laboratory, and documentation filed with the school’s asbestos management plan. The local education agency must notify parents, teachers, and staff of the completed response action and its results. Clearance criterion: the mean of indoor samples must not exceed the mean of outdoor samples, or 0.01 f/cc, whichever is higher. All school clearance work must be performed by AHERA-accredited inspectors and project designers.
Commercial and Industrial Buildings (OSHA / NESHAP)
Commercial buildings — offices, retail spaces, warehouses, manufacturing facilities — are regulated under OSHA (29 CFR 1926.1101 for construction) and NESHAP (40 CFR Part 61, Subpart M) for demolition and renovation. OSHA requires clearance sampling after Class I asbestos work (removal of thermal system insulation and surfacing materials) but does not prescribe a specific number of samples or mandate aggressive sampling.
NESHAP requires proper removal and disposal of regulated asbestos-containing material but does not have a specific clearance air sampling requirement — the regulation focuses on proper work practices and waste handling rather than post-abatement air quality verification. Despite the absence of a NESHAP clearance mandate, most commercial project specifications require clearance sampling as a condition of contract closeout, and many building owners require it as a risk management measure.
Residential Properties
Single-family and multi-family residential properties are not covered by AHERA and are generally exempt from OSHA regulations when the work is performed by the homeowner. However, when a licensed abatement contractor performs the work, OSHA construction standards apply to the contractor’s employees. Many states and municipalities require clearance testing for residential abatement projects through state licensing regulations.
In Texas, the DSHS asbestos regulations require clearance air monitoring for abatement projects in all building types when performed by a licensed abatement contractor. Residential clearance sampling typically uses fewer sample points than commercial or school projects — a common specification calls for one sample per room plus one outdoor background sample.
Government and Military Facilities
Federal government buildings follow agency-specific asbestos management programs that often impose clearance requirements exceeding OSHA minimums. The General Services Administration (GSA), Department of Defense (DoD), and Department of Energy (DOE) each maintain asbestos management manuals that specify clearance sampling protocols, number of samples, analytical methods, and documentation requirements.
AGT Labs has experience supporting clearance testing for federal projects and can accommodate agency-specific reporting requirements.
Asbestos Clearance Testing — Frequently Asked Questions
Answered by the accredited microscopists who issue the clearance letters.
What is post-abatement asbestos clearance testing?
How fast can I get a clearance result?
When is clearance testing required in Texas?
What is the clearance criterion?
Why does the visual inspection have to come first?
What is aggressive sampling and do I need it?
How many clearance samples do I need?
What happens if the clearance fails?
Can AGT Labs do the clearance sampling for us?
Is a PCM clearance letter accepted by Texas DSHS?
Do you offer standing clearance accounts for contractors?
Clearance Samples on Site Right Now?
1-day rush turnaround for samples received before 2:00 PM CT. Houston metro courier pickup available — call and we will collect while the containment is still up.