9VAC25-31-630. Pollutant limits (other than domestic septage).

A. Active sewage sludge unit without a liner and leachate collection system.

1. Except as provided in subdivision A 2 and subsection B of this section, the concentration of each pollutant listed in Table 1 of this section in sewage sludge placed on an active sewage sludge unit shall not exceed the concentration for the pollutant in Table 1 of this section.

TABLE 1. POLLUTANT CONCENTRATIONS--ACTIVE SEWAGE SLUDGE UNIT WITHOUT A LINER AND LEACHATE COLLECTION
Pollutant Concentration	Concentration (milligrams per kilogram*)
Arsenic	73
Chromium	600
Nickel	420
*Dry weight basis

2. Except as provided in subsection B of this section, the concentration of each pollutant listed in Table 1 of this section 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.

a. The actual distance from the active sewage sludge unit boundary to the property line of the surface disposal site shall be determined.

b. The concentration of each pollutant listed in Table 2 of this section in the sewage sludge shall not exceed the concentration in Table 2 of this section that corresponds to the actual distance in subdivision 2 a of this subsection.

TABLE 2--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*
Distance (meters)	Arsenic (mg/kg)	Chromium (mg/kg)	Nickel (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
*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 subdivision B 2 of this section for an active sewage sludge unit without a liner and leachate collection system when the existing values for site parameters specified by the department are different from the values for those parameters used to develop the pollutant limits in Table 1 of this section and when the department 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 this section 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 department, or the existing concentration of the pollutant in the sewage sludge, whichever is lower.

Statutory Authority

§ 62.1-44.15 of the Code of Virginia; § 402 of the federal Clean Water Act; 40 CFR Parts 122, 123, 124, 403, and 503.

Historical Notes

Derived from Virginia Register Volume 12, Issue 20, eff. July 24, 1996; amended, Virginia Register Volume 39, Issue 4, eff. November 9, 2022.

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