[Code of Federal Regulations]
[Title 40, Volume 28]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR503.23]

[Page 834-835]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 503_STANDARDS FOR THE USE OR DISPOSAL OF SEWAGE SLUDGE
--Table of Contents
 
                       Subpart C_Surface Disposal
 
Sec. 503.23  Pollutant limits (other than domestic septage).

    (a) Active sewage sludge unit without a liner and leachate 
collection system.
    (1) Except as provided in Sec. 503.23 (a)(2) and (b), the 
concentration of each pollutant listed in Table 1 of Sec. 503.23 in 
sewage sludge placed on an active sewage sludge unit shall not exceed 
the concentration for the pollutant in Table 1 of Sec. 503.23.

Table 1 of Sec. 503.23--Pollutant Concentrations--Active Sewage Sludge
              Unit Without a Liner and Leachate Collection
------------------------------------------------------------------------
                                                           Concentration
                                                            (milligrams
                        Pollutant                          per kilograms
                                                                1)
------------------------------------------------------------------------
Arsenic.................................................              73
Chromium................................................             600
Nickel..................................................            420
------------------------------------------------------------------------
1 Dry weight basis.


    (2) Except as provided in Sec. 503.23(b), the concentration of each 
pollutant listed in Table 1 of Sec. 503.23 in sewage sludge placed on 
an active sewage sludge unit whose boundary is less than 150 meters from 
the property line of the surface disposal site shall not exceed the 
concentration determined using the following procedure.
    (i) The actual distance from the active sewage sludge unit boundary 
to

[[Page 835]]

the property line of the surface disposal site shall be determined.
    (ii) The concentration of each pollutant listed in Table 2 of Sec. 
503.23 in the sewage sludge shall not exceed the concentration in Table 
2 of Sec. 503.23 that corresponds to the actual distance in Sec. 
503.23(a)(2)(i).

Table 2 of Sec. 503.23--Pollutant Concentrations--Active Sewage Sludge
   Unit Without a Liner and Leachate Collection System That Has a Unit
         Boundary to Property Line Distance Less Than 150 Meters
------------------------------------------------------------------------
      Unit boundary to property line         Pollutant concentration 1
------------------------------------------------------------------------
                                            Arsenic   Chromium   Nickel
            Distance (meters)               (mg/kg)   (mg/kg)    (mg/kg)
------------------------------------------------------------------------
0 to less than 25........................        30        200       210
25 to less than 50.......................        34        220       240
50 to less than 75.......................        39        260       270
75 to less than 100......................        46        300       320
100 to less than 125.....................        53        360       390
125 to less than 150.....................        62        450      420
------------------------------------------------------------------------
1 Dry weight basis.

    (b) Active sewage sludge unit without a liner and leachate 
collection system--site-specific limits.
    (1) At the time of permit application, the owner/operator of a 
surface disposal site may request site-specific pollutant limits in 
accordance with Sec. 503.23(b)(2) for an active sewage sludge unit 
without a liner and leachate collection system when the existing values 
for site parameters specified by the permitting authority are different 
from the values for those parameters used to develop the pollutant 
limits in Table 1 of Sec. 503.23 and when the permitting authority 
determines that site-specific pollutant limits are appropriate for the 
active sewage sludge unit.
    (2) The concentration of each pollutant listed in Table 1 of Sec. 
503.23 in sewage sludge placed on an active sewage sludge unit without a 
liner and leachate collection system shall not exceed either the 
concentration for the pollutant determined during a site-specific 
assessment, as specified by the permitting authority, or the existing 
concentration of the pollutant in the sewage sludge, whichever is lower.