[Code of Federal Regulations]
[Title 40, Volume 29]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR464.03]

[Page 553]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 464_METAL MOLDING AND CASTING POINT SOURCE CATEGORY
--Table of Contents
 
Sec. 464.03  Monitoring and reporting requirements.

    (a) As an alternative to monitoring for TTO (total toxic organics), 
an indirect discharging plant may elect to monitor for Oil and Grease 
instead. Compliance with the Oil and Grease standard shall be considered 
equivalent to complying with the TTO standard. Alternate Oil and Grease 
standards are provided as substitutes for the TTO standards provided in 
Sec. Sec. 464.15, 464.16, 464.25, 464.26, 464.35, 464.36, 464.45, and 
464.46.
    (b) POTWs may establish concentration standards rather than mass 
standards, but must ensure that the concentration standards are exactly 
equivalent to the mass-based standards provided in Sec. Sec. 464.15, 
464.16, 464.25, 464.26, 464.35, 464.36, 464.45, and 464.46. Equivalent 
concentration standards may be determined by multiplying the mass-based 
standards included in the regulations by an appropriate measurement of 
average production, raw material usage, or air scrubber flow (kkg of 
metal poured, kkg of sand reclaimed, or standard cubic meters of air 
scrubbed) and dividing by an appropriate measure of average discharge 
flow to the POTW, taking into account the proper conversion factors to 
ensure that the units (mg/l) are correct.
    (c) The ``monthly average'' regulatory values shall be the basis for 
the monthly average effluent limitations guidelines and standards in 
direct discharge permits and for pretreatment standards. Compliance with 
the monthly average effluent limitations guidelines and standards is 
required regardless of the number of samples analyzed and averaged.