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Virginia Administrative Code
Title 9. Environment
Agency 25. State Water Control Board
Chapter 31. Virginia Pollutant Discharge Elimination System (VPDES) Permit Regulation
10/26/2020

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 board are different from the values for those parameters used to develop the pollutant limits in Table 1 of this section and when the board 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 board, or the existing concentration of the pollutant in the sewage sludge, whichever is lower.

Statutory Authority

§§ 62.1-44.15, 62.1-44.16, 62.1-44.17, 62.1-44.18, and 62.1-44.19 of the Code of Virginia.

Historical Notes

Derived from Volume 12, Issue 20, eff. July 24, 1996.

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