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NOTICE
The information in this document was developed through a collaboration between the U.S. EPA (Subsurface
Protection and Remediation Division, National Risk Management Research Laboratory, Robert S. Kerr
Environmental Research Center, Ada, Oklahoma [RSKERC]) and the U.S. Air Force (U.S. Air Force Center
for Environmental Excellence, Brooks Air Force Base, Texas). EPA staff contributed conceptual guidance
in the development of the BIOCHLOR mathematical model. To illustrate the appropriate application of
BIOCHLOR, EPA contributed field data generated by EPA staff supported by ManTech Environmental
Research Services Corp, the in-house analytical support contractor at the RSKERC. The computer code for
BIOCHLOR was developed by Groundwater Services, Inc. through a contract with the U.S. Air Force.
Groundwater Services, Inc. also provided field data to illustrate the application of the model.
All data generated by EPA staff or by ManTech Environmental Research Services Corp were collected
following procedures described in the field sampling Quality Assurance Plan for an in-house research
project on natural attenuation, and the analytical Quality Assurance Plan for ManTech Environmental
Research Services Corp. The development of BIOCHLOR and its User’s Manual were not funded by the
U.S. EPA and as such are not subject to the Agency’s QA requirements.
An extensive investment in site characterization and mathematical modeling is often necessary to establish
the contribution of natural attenuation at a particular site. BIOCHLOR is offered as a screening tool to
determine whether it is appropriate to invest in a full-scale evaluation of natural attenuation at a particular
site. Because BIOCHLOR incorporates a number of simplifying assumptions, it is not a substitute for the
detailed mathematical models that are necessary for making final regulatory decisions at complex sites.
BIOCHLOR and its User’s Manual have undergone external and internal peer review conducted by the U.S.
EPA and the U.S. Air Force. However, BIOCHLOR is made available on an as-is basis without guarantee
or warranty of any kind, express or implied. Neither the United States Government (U.S. EPA or U.S. Air
Force), Ground Water Services, Inc., any of the authors nor reviewers accept any liability resulting from the
use of BIOCHLOR or its documentation. Implementation of BIOCHLOR and interpretation of the predictions
of the model are the sole responsibility of the user.
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