[Code of Federal Regulations]

[Title 40, Volume 21]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR125.87]



[Page 343-344]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 125_CRITERIA AND STANDARDS FOR THE NATIONAL POLLUTANT DISCHARGE 

ELIMINATION SYSTEM--Table of Contents

 

Subpart I_Requirements Applicable to Cooling Water Intake Structures for 

             New Facilities Under Section 316(b) of the Act

 

Sec.  125.87  As an owner or operator of a new facility, must I perform 

monitoring?



    As an owner or operator of a new facility, you will be required to 

perform monitoring to demonstrate your compliance with the requirements 

specified in Sec.  125.84.

    (a) Biological monitoring. You must monitor both impingement and 

entrainment of the commercial, recreational, and forage base fish and 

shellfish species identified in either the Source Water Baseline 

Biological Characterization data required by 40 CFR 122.21(r)(3) or the 

Comprehensive Demonstration Study required by Sec.  125.86(c)(2), 

depending on whether you chose to comply with Track I or Track II. The 

monitoring methods used must be consistent with those used for the 

Source Water Baseline Biological Characterization data required in 40 

CFR 122.21(r)(3) or the Comprehensive Demonstration Study required by 

Sec.  125.86(c)(2). You must follow the monitoring frequencies 

identified below for at least two (2) years after the initial permit 

issuance. After that time, the Director may approve a request for less 

frequent sampling in the remaining years of the permit term and when the 

permit is reissued, if supporting data show that less frequent 

monitoring would still allow for the detection of any seasonal and daily 

variations in the species and numbers of individuals that are impinged 

or entrained.

    (1) Impingement sampling. You must collect samples to monitor 

impingement rates (simple enumeration) for each species over a 24-hour 

period and no less than once per month when the cooling water intake 

structure is in operation.

    (2) Entrainment sampling. You must collect samples to monitor 

entrainment rates (simple enumeration) for each species over a 24-hour 

period and no less than biweekly during the primary period of 

reproduction, larval recruitment, and peak abundance identified during 

the Source Water Baseline Biological Characterization required by 40 CFR 

122.21(r)(3) or the Comprehensive Demonstration Study required in Sec.  

125.86(c)(2). You must collect samples only when the cooling water 

intake structure is in operation.

    (b) Velocity monitoring. If your facility uses surface intake screen 

systems, you must monitor head loss across the screens and correlate the 

measured value with the design intake velocity. The head loss across the 

intake screen must be measured at the minimum ambient source water 

surface elevation (best professional judgment based on available 

hydrological data). The maximum head loss across the screen for each 

cooling water intake structure must be used to determine compliance with 

the velocity requirement in Sec.  125.84(b)(2) or (c)(1). If your 

facility uses devices other than surface intake screens, you must 

monitor velocity at the point of entry through the device. You must 

monitor head loss or velocity during initial facility startup, and 

thereafter, at the frequency specified



[[Page 344]]



in your NPDES permit, but no less than once per quarter.

    (c) Visual or remote inspections. You must either conduct visual 

inspections or employ remote monitoring devices during the period the 

cooling water intake structure is in operation. You must conduct visual 

inspections at least weekly to ensure that any design and construction 

technologies required in Sec.  125.84(b)(4) and (5), or (c)(3) and (4) 

are maintained and operated to ensure that they will continue to 

function as designed. Alternatively, you must inspect via remote 

monitoring devices to ensure that the impingement and entrainment 

technologies are functioning as designed.