15A ncac 02T .1105      POLLUTANT LIMITS

(a)  Residuals shall not be land applied if the concentration of any pollutant in the residuals exceeds the ceiling concentration for that pollutant as stipulated in the following on a dry weight basis:

Pollutant                                                        Ceiling Concentration

(milligrams per kilogram) 

Arsenic                                                                                 75

Cadmium                                                                              85

Copper                                                                             4,300

Lead                                                                                    840

Mercury                                                                                57

Molybdenum                                                                       75

Nickel                                                                                 420

Selenium                                                                            100

Zinc                                                                                  7,500

(b)  Class B residuals shall not be land applied if the application causes the cumulative pollutant loading rate, on a dry weight basis, to be exceeded for any pollutant as stipulated in the following:

Pollutant                                                        Cumulative Pollutant

Loading Rate

(kilograms per hectare) 

Arsenic                                                                                 41

Cadmium                                                                              39

Copper                                                                             1,500

Lead                                                                                    300

Mercury                                                                                17

Nickel                                                                                 420

Selenium                                                                            100

Zinc                                                                                  2,800

Compliance with the cumulative pollutant loading rates shall be determined using one of the following methods:

(1)           by calculating the existing cumulative level of pollutants using analytical data from all historical land application of residuals not otherwise exempted by this Paragraph; or

(2)           for land on which land application events of residuals has not occurred or for which the data required in Paragraph (b) of this Rule is incomplete, by determining background concentrations through representative soil sampling.

(c)  Class A residuals shall not be applied if the concentration of any pollutant in the residuals exceeds the concentration for that pollutant, as stipulated in the following on a dry weight basis:

Pollutant                                        Monthly Average Concentration

(milligrams per kilogram) 

Arsenic                                                                                 41

Cadmium                                                                              39

Copper                                                                             1,500

Lead                                                                                    300

Mercury                                                                                17

Nickel                                                                                 420

Selenium                                                                            100

Zinc                                                                                  2,800

(d)  Residuals shall not be placed in a surface disposal unit if the concentration of any pollutant in the residuals exceeds the concentration for that pollutant, as stipulated in the following on a dry weight basis:

Distance from Surface Disposal Unit                      Ceiling Concentration

Boundary to Closest Property Line                          (milligrams per kilogram)

(meters) 

Arsenic               Chromium            Nickel

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

greater than 150                                                                   73                         600                       420

History Note:        Authority G.S. 143-215.1; 143-215.3(a);

Eff. September 1, 2006;

Readopted Eff. September 1, 2018.