[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: 40CFR437.4]

[Page 364-365]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 437_THE CENTRALIZED WASTE TREATMENT POINT SOURCE CATEGORY
--Table of Contents
 
Sec. 437.4  Monitoring requirements.

    (a) Permit compliance monitoring is required for each regulated 
parameter.
    (b) Any CWT facility that discharges wastewater resulting from the 
treatment of metal-bearing waste, oily waste, or organic-bearing waste 
must monitor as follows:
    (1) Facilities subject to more than one subpart of this part must 
monitor for compliance for each subpart after treatment and before 
mixing of the

[[Page 365]]

waste with wastes of any other subpart. Alternatively, a multiple 
wastestream subcategory facility may certify that it provides equivalent 
treatment as defined in Sec. 437.2(h) for the applicable waste and 
monitor for compliance with the applicable set of multiple wastestream 
subcategory limitations after mixing.
    (2) Facilities subject to one or more subpart of this part must 
monitor for compliance with the applicable subpart after treatment and 
before mixing of the waste with wastes of any other subpart, 
uncontaminated storm water, or wastewater subject to another effluent 
limitation or standard in Subchapter N. If, however, the facility can 
demonstrate to the receiving POTW or permitting authority the capability 
of achieving the effluent limitation or standard for each subpart after 
treatment and before mixing with other wastestreams, the facility may 
monitor for compliance after mixing. In the case of a facility which 
elects to comply with the applicable set of multiple wastestream 
subcategory limitations or standards, it is only subject to one subpart.
    (3) When a CWT facility treats any waste receipt that contains 
cyanide at a concentration higher than 136 mg/L, the CWT facility must 
monitor for cyanide after cyanide treatment and before dilution with 
other wastestreams. If, however, the facility can demonstrate to the 
receiving POTW or permitting authority the capability of achieving the 
cyanide limitation or standard after cyanide treatment and before mixing 
with other wastestreams, the facility may monitor for compliance after 
mixing.