Chapter 5: Construction

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Section 1: Overview

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Goals

The goals for the construction stage of project development include:

  • implementation of the preventive action plan that was developed in the design stage for any contamination anticipated to be encountered during construction
  • development and implementation of procedures to handle or manage unanticipated contamination encountered during construction
  • documentation of implemented preventive provisions and actions.
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Procedure Overview

One benefit of performing environmental site assessments early in project development is that unanticipated contamination encountered during construction is minimized. When contamination is unexpectedly encountered in a construction project, potential negative consequences include injury to workers and the public, damage to equipment and property, delays in construction, damage claims by the contractor and additional costs for the procurement of consultant services, specialty contractors and field changes. If hazardous materials are discovered, project construction may be delayed until a lengthy, complex process of investigation produces acceptable measures to handle the contamination. Also, if the unanticipated encounter with hazardous material contamination aggravates the problem, such as causing a further release of contaminants, then TxDOT may become partially liable for the environmental consequences and required cleanup of the release.

When hazardous materials are identified during earlier phases of the project development and it is determined that cleanup is not feasible prior to construction, then preventive action may be incorporated into the construction project. Preventive action refers to cleanup and related activities required to affect the construction of the highway project. Corrective action refers to activities required by state or federal regulations to be performed by a responsible party to protect human health and the environment.

See Chapter 4, Section 4, Contamination Factors and Considerations during Construction, for a cost effective and efficient manner to handle contamination on a project.

TxDOT Standard Specifications do not provide for the inclusion of analytical testing, preventive action or management of contaminants in the construction contracts, since these are outside the scope of "Highway Construction." If such preventive measures are required of the prime construction contractor or specialty subcontractor (Option 5), they should be included by special provision. See Chapter 4, Section 4, Contamination Factors and Considerations during Construction, regarding special provisions. Otherwise, refer to Options 2, 3, 4 and 6 in Chapter 4: Design, Section 4. Even if the prime construction contractor will not carry out preventive measures, the PS&E may include general notes or notifications designed to avoid or minimize contractor downtime.

Construction-related responsibilities for preparation to manage anticipated hazardous materials include:

  • coordinating between the prime construction contractor, specialty contractors, consultant(s) and other subcontractors
  • implementing provisions for worker and public safety and handling/disposal of hazardous materials or waste
  • implementing oversight provisions for preventive action aspects of the contract
  • documenting the actions taken for sub-items related to preventive action.

For unanticipated hazardous materials/waste encountered during construction, the major steps to follow after discovery are:

  1. identify the unanticipated site or structure
  2. secure the site to protect workers and the public
  3. notify the proper authorities and responsible parties
  4. determine the worker safety and public exposure concerns
  5. characterize the contaminant(s)
  6. develop and implement hazardous materials/waste management measures
  7. document the event starting with discovery.

FHWA may choose not to contribute to additional costs related to hazardous materials if "due diligence" was not used in assessing the project limits during the planning stages of the project. If unanticipated contamination is encountered during construction, it may be necessary to defend any actions taken with thorough documentation for federal participation.

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