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e-CFR data is current as of September 24, 2020

Title 40Chapter ISubchapter OPart 503Subpart C → §503.23


Title 40: Protection of Environment
PART 503—STANDARDS FOR THE USE OR DISPOSAL OF SEWAGE SLUDGE
Subpart C—Surface Disposal


§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 §503.23 (a)(2) and (b), the concentration of each pollutant listed in Table 1 of §503.23 in sewage sludge placed on an active sewage sludge unit shall not exceed the concentration for the pollutant in Table 1 of §503.23.

Table 1 of §503.23—Pollutant Concentrations—Active Sewage Sludge Unit Without a Liner and Leachate Collection

PollutantConcentration (milligrams per kilograms1)
Arsenic73
Chromium600
Nickel420

1Dry weight basis.

(2) Except as provided in §503.23(b), the concentration of each pollutant listed in Table 1 of §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 the property line of the surface disposal site shall be determined.

(ii) The concentration of each pollutant listed in Table 2 of §503.23 in the sewage sludge shall not exceed the concentration in Table 2 of §503.23 that corresponds to the actual distance in §503.23(a)(2)(i).

Table 2 of §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 linePollutant concentration1
Distance (meters)Arsenic (mg/kg)Chromium (mg/kg)Nickel (mg/kg)
0 to less than 2530200210
25 to less than 5034220240
50 to less than 7539260270
75 to less than 10046300320
100 to less than 12553360390
125 to less than 15062450420

1Dry 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 §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 §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 §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.

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