Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Chemicals and Toxics
    • Climate Change
    • Emergency Response
    • Environmental Information by Location
    • Environmental Justice
    • Greener Living
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Pesticides
    • Radon
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Guidance
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • EPA Administrator
    • Organization Chart
    • Staff Directory
    • Planning, Budget, and Results
    • Jobs and Internships
    • Headquarters Offices
    • Regional Offices
    • Lab and Research Centers
Related Topics:
  • Water Research
  • Land Research
Contact Us

BIOCHLOR, Natural Attenuation Decision Support System

Ask a Technical Expert

Got a question about our research model? Want to give us feedback? Contact a technical expert about BIOCHLOR.

BIOCHLOR is a screening model that simulates remediation by natural attenuation of dissolved solvents at chlorinated solvent release sites. BIOCHLOR includes three different model types:

  • Solute transport without decay
  • Solute transport with biotransformation modeled as a sequential first-order decay process
  • Solute transport with biotransformation modeled as a sequential first-order decay process with two different reaction zones (i.e., each zone has a different set of rate coefficient values)

The software, programmed in the Microsoft Excel spreadsheet environment and based on the Domenico analytical solute transport model, has the ability to simulate one-dimensional advection, three-dimensional dispersion, linear adsorption, and biotransformation via reductive dechlorination (the dominant biotransformation process at most chlorinated solvent sites). Reductive dechlorination is assumed to occur under anaerobic conditions and dissolved solvent degradation is assumed to follow a sequential first-order decay process.

Specifications
Version 2.2
Release Date June 2002
Development Status General Release
Operating System Windows 95/98/NT, Excel

Minimum System Requirements

The BIOCHLOR model requires a computer system capable of running Microsoft Excel 97 or 2000 for Windows. Operation requires an IBM-compatible PC equipped with a Pentium II or later processor. A minimum of 64 MB of RAM is strongly recommended.

Downloads

Excel 2000 Version: User's manual, installation program, help files, and installation instructions (exe) (2.28 MB)

Excel 97 Version: User's manual, installation program, help files, and installation instructions (exe) (2.21 MB) Excel 97 Version: User's manual, installation program, help files, and installation instructions (EXE)

US EPA. (2000) "BIOCHLOR, Natural Attenuation Decision Support System - User's Manual, Version 1.0." (PDF) (54 pp, 541 K, About PDF)

US EPA. (2002) "BIOCHLOR, Natural Attenuation Decision Support System, Version 2.2, User's Manual Addendum." (PDF)

Contact Us to ask a question, provide feedback, or report a problem.
Last updated on November 25, 2022
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data.gov
  • Inspector General
  • Jobs
  • Newsroom
  • Open Government
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions

Follow.