[Code of Federal Regulations]
[Title 40, Volume 21]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR141.76]

[Page 459-460]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 141_NATIONAL PRIMARY DRINKING WATER REGULATIONS--Table of Contents
 
                  Subpart H_Filtration and Disinfection
 
Sec. 141.76  Recycle provisions.

    (a) Applicability. All subpart H systems that employ conventional 
filtration or direct filtration treatment and that recycle spent filter 
backwash water, thickener supernatant, or liquids from dewatering 
processes must meet the requirements in paragraphs (b) through (d) of 
this section.
    (b) Reporting. A system must notify the State in writing by 
Decemeber 8, 2003, if the system recycles spent filter backwash water, 
thickener supernatant, or liquids from dewatering processes. This 
notification must include, at a minimum, the information specified in 
paragraphs (b)(1) and (2) of this section.
    (1) A plant schematic showing the origin of all flows which are 
recycled (including, but not limited to, spent filter backwash water, 
thickener supernatant, and liquids from dewatering processes), the 
hydraulic conveyance used to transport them, and the location where they 
are re-introduced back into the treatment plant.
    (2) Typical recycle flow in gallons per minute (gpm), the highest 
observed plant flow experienced in the previous year (gpm), design flow 
for the treatment plant (gpm), and State-approved operating capacity for 
the plant where the State has made such determinations.
    (c) Treatment technique requirement. Any system that recycles spent 
filter backwash water, thickener supernatant, or liquids from dewatering 
processes must return these flows through the processes of a system's 
existing conventional or direct filtration

[[Page 460]]

system as defined in Sec. 141.2 or at an alternate location approved by 
the State by June 8, 2004. If capital improvements are required to 
modify the recycle location to meet this requirement, all capital 
improvements must be completed no later than June 8, 2006.
    (d) Recordkeeping. The system must collect and retain on file 
recycle flow information specified in paragraphs (d)(1) through (6) of 
this section for review and evaluation by the State beginning June 8, 
2004.
    (1) Copy of the recycle notification and information submitted to 
the State under paragraph (b) of this section.
    (2) List of all recycle flows and the frequency with which they are 
returned.
    (3) Average and maximum backwash flow rate through the filters and 
the average and maximum duration of the filter backwash process in 
minutes.
    (4) Typical filter run length and a written summary of how filter 
run length is determined.
    (5) The type of treatment provided for the recycle flow.
    (6) Data on the physical dimensions of the equalization and/or 
treatment units, typical and maximum hydraulic loading rates, type of 
treatment chemicals used and average dose and frequency of use, and 
frequency at which solids are removed, if applicable.

[66 FR 31103, June 8, 2001]