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Safety & OSHAaka: hazmataka: hazardous substanceaka: dangerous goods

Hazardous Material

In Plain English

Any dangerous substance on a job site that can harm people or the environment.

Definition

A hazardous material is any substance that poses a risk to health, safety, or the environment due to its physical, chemical, or biological properties, including flammability, toxicity, corrosivity, or reactivity. On construction sites, hazardous materials include asbestos, lead paint, silica dust, solvents, and chemical products. Handling, storage, and disposal of hazardous materials are governed by OSHA, EPA, and state regulations.

Why It Matters in Bidding

Hazardous materials are a major risk and pricing variable, especially on renovation and demolition where asbestos, lead, or contaminated soil can surface unexpectedly. Estimators routinely exclude unknown hazmat, carry allowances, or price abatement as a separate scope, because misjudging it can turn a profitable job into a costly liability with regulatory exposure.

Example

Bidding a 1970s building demolition, the estimator excludes asbestos abatement pending a survey and carries a unit-price allowance for lead-paint handling in case it is discovered.

Related Terms

Hazard Communication (HazCom)Safety Data Sheet (SDS)Silica ExposurePersonal Protective Equipment (PPE)

Frequently Asked Questions

They review available surveys, exclude unknown conditions in writing, and either carry an allowance or bid abatement as separate, qualified scope. Unit prices for handling discovered material let the contractor price the work fairly without absorbing open-ended risk, while clear exclusions protect against claims for conditions outside the documents.
Asbestos in older flooring, insulation, and mastics; lead in paint and pipes; crystalline silica from cutting concrete and masonry; and solvents, adhesives, and fuels are the most frequent. Renovation and demolition carry the highest discovery risk, which is why pre-bid surveys heavily influence pricing and exclusions.
It depends on the contract. If hazmat was excluded or treated as a differing site condition, the owner typically funds abatement through a change order. If the contractor failed to qualify the scope, it may absorb the cost. Clear exclusions and allowances at bid time determine where that risk lands.

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