UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                                                                            WSG175
                                                         Date Signed: December 1, 2004

MEMORANDUM

SUBJECT:   LT1ESWTR Turbidity Provisions Technical Guidance Manual

FROM:      Stephen F. Heare, Director
             Drinking Water Protection Division

TO:          Drinking Water Program Managers
             Regions I - X


   I am writing to inform you that the Long Term 1 Enhanced Surface Water Treatment Rule
Turbidity Provisions - Technical Guidance Manual is now available.

    The Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR) increases public
health protection by reducing the risk of exposure to microbiological pathogens, specifically
Cryptosporidium. On January 1, 2005, systems will begin complying with the turbidity
provisions in this rule.

   This document provides operators with practical guidance and sample worksheets which may
help systems collect important information. The document also includes additional materials
such as a background reference information, equations and sample calculations, example
reports, and example operating procedures.  The document is available in electronic format on
the EPA website at  http://www.epa.gov/safewater/mdbp/ltleswtr.html. Hard copies will also
be available shortly and will be sent to you for your reference. Additional copies can be obtained
by contacting the Water Resource Center at 202-566-1729 (identify document number EPA 816-
R-04-007). You may also contact the National Service Center for Environmental Publication 1-
800-490-9198 to obtain hard copies.

   If you have any questions, please contact Katie Leo Porter at (202) 564-3839.

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