[Code of Federal Regulations]
[Title 40, Volume 8]
[Revised as of July 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR61.54]

[Page 48-49]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 61_NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS--Table of 
 
            Subpart E_National Emission Standard for Mercury
 
Sec. 61.54  Sludge sampling.

    (a) As an alternative means for demonstrating compliance with Sec. 
61.52(b), an owner or operator may use Method 105 of appendix B and the 
procedures specified in this section.
    (1) A sludge test shall be conducted within 90 days of the effective 
date of these regulations in the case of an existing source or a new 
source which has an initial startup date preceding the effective date; 
or
    (2) A sludge test shall be conducted within 90 days of startup in 
the case of a new source which did not have an initial startup date 
preceding the effective date.
    (b) The Administrator shall be notified at least 30 days prior to a 
sludge sampling test, so that he may at his option observe the test.
    (c) Sludge shall be sampled according to paragraph (c)(1) of this 
section, sludge charging rate for the plant shall be determined 
according to paragraph (c)(2) of this section, and the sludge analysis 
shall be performed according to paragraph (c)(3) of this section.
    (1) The sludge shall be sampled according to Method 105--
Determination of Mercury in Wastewater Treatment Plant Sewage Sludges. A 
total of three composite samples shall be obtained within an operating 
period of 24 hours. When the 24-hour operating period is not continuous, 
the total sampling period shall not exceed 72 hours after the first grab 
sample is obtained. Samples shall not be exposed to any condition that 
may result in mercury contamination or loss.
    (2) The maximum 24-hour period sludge incineration or drying rate 
shall be determined by use of a flow rate measurement device that can 
measure the mass rate of sludge charged to the incinerator or dryer with 
an accuracy of 5 percent over its operating range. 
Other methods of measuring sludge mass charging rates may be used if 
they have received prior approval by the Administrator.
    (3) The sampling, handling, preparation, and analysis of sludge 
samples shall be accomplished according to Method 105 in appendix B of 
this part.
    (d) The mercury emissions shall be determined by use of the 
following equation.
[GRAPHIC] [TIFF OMITTED] TC15NO91.047

where:

EHg=Mercury emissions, g/day.
M=Mercury concentration of sludge on a dry solids basis, [micro]g/g.
Q=Sludge changing rate, kg/day.
Fsm=Weight fraction of solids in the collected sludge after 
mixing.
1000=Conversion factor, kg [micro]g/g\2\.

    (e) No changes in the operation of a plant shall be made after a 
sludge test has been conducted which would potentially increase 
emissions above the level determined by the most recent sludge test, 
until the new emission level has been estimated by calculation and the 
results reported to the Administrator.
    (f) All sludge samples shall be analyzed for mercury content within 
30 days after the sludge sample is collected. Each determination shall 
be reported to the Administrator by a registered letter dispatched 
within 15 calendar days following the date such determination is 
completed.
    (g) Records of sludge sampling, charging rate determination and 
other data needed to determine mercury content of wastewater treatment 
plant sludges shall be retained at the source and made available, for 
inspection by

[[Page 49]]

the Administrator, for a minimum of 2 years.

[40 FR 48303, Oct. 14, 1975, as amended at 49 FR 35770, Sept. 12, 1984; 
52 FR 8727, Mar. 19, 1987; 53 FR 36972, Sept. 23, 1988]