Md. Code Regs. 15.18.04.05 - Compost Classification
A. A
compost product is classified as a General Use, Limited Use, or Restricted Use
compost as shown in §§B-D of this regulation.
B. General Use Compost.
(1) General Use compost may not exceed the
following specifications:
Parameter | Parameter LimitAll limits apply toproduct leavingcomposting facility. |
(a) pH (range) | 6.0-8.0 |
(b) Heavy metals (maximum) | |
(i) Arsenic | 41 mg/kg dry wt. |
(ii) Cadmium | 39 mg/kg dry wt. |
(iii) Chromium | 1200 mg/kg dry wt. |
(iv) Copper | 1500 mg/kg dry wt. |
(v) Lead | 300 mg/kg dry wt. |
(vi) Mercury | 17 mg/kg dry wt. |
(vii) Molybdenum | 18 mg/kg dry wt. |
(viii) Nickel | 420 mg/kg dry wt. |
(ix) Selenium | 36 mg/kg dry wt. |
(x) Zinc | 2800 mg/kg dry wt. |
(c) PCBs | 5 ppm |
(d) Man-made inerts (maximum)>4mm, <13mm | 2 percent dry wt. |
(e) Film plastic >4mm | 2 percent dry wt. |
(f) Process to further reducepathogens (required for compost from municipalsolid waste or manure) | pass |
(2)
A General Use compost:
(a) Shall pass through
a 12mm (1/2 inch) screen;
(b) Shall
be stabilized;
(c) May not have an
objectionable odor; and
(d) May be
distributed as a soil conditioner for use by the general public or for any use
allowed by this chapter.
C. Limited Use Compost.
(1) A Limited Use compost may not exceed the
following specifications:
Parameter | Parameter LimitAll limits apply toproduct leavingcomposting facility. |
(a) pH (range) | 6.0-8.0 |
(b) Heavy metals (maximum) | |
(i) Arsenic | 41 mg/kg dry wt. |
(ii) Cadmium | 39 mg/kg dry wt. |
(iii) Chromium | 1200 mg/kg dry wt. |
(iv) Copper | 1500 mg/kg dry wt. |
(v) Lead | 300 mg/kg dry wt. |
(vi) Mercury | 17 mg/kg dry wt. |
(vii) Molybdenum | 18 mg/kg dry wt. |
(viii) Nickel | 420 mg/kg dry wt. |
(ix) Selenium | 36 mg/kg dry wt. |
(x) Zinc | 2800 mg/kg dry wt. |
(c) PCBs | 10 ppm |
(d) Man-made inerts (maximum)>4mm | 4 percent dry wt. |
(e) Film plastic >4mm | 2 percent dry wt. |
(f) Process to further reducepathogens (required for compost from municipalsolid waste or manure) | pass |
(2)
A Limited Use compost:
(a) Shall pass through
an 18mm (3/4 inch) screen;
(b)
Shall be stabilized;
(c) May not
have an objectionable odor; and
(d)
May only be distributed for use by a commercial, agricultural, institutional,
or governmental operation, or for restricted use as provided by this
chapter.
D.
Restricted Use Compost:
(1) A Restricted Use
compost may not exceed the indicated maximum level for any heavy metal or trace
element, as follows:
(a) Arsenic | 75 mg/kg dry wt. |
(b) Cadmium | 85 mg/kg dry wt. |
(c) Chromium | 3000 mg/kg dry wt. |
(d) Copper | 4300 mg/kg dry wt. |
(e) Lead | 840 mg/kg dry wt. |
(f) Mercury | 57 mg/kg dry wt. |
(g) Molybdenum | 75 mg/kg dry wt. |
(h) Nickel | 420 mg/kg dry wt. |
(i) Selenium | 100 mg/kg dry wt. |
(j) Zinc | 7500 mg/kg dry wt. |
(2)
A Restricted Use compost:
(a) May not be a
hazardous waste, as defined in COMAR
26.13.02.03D;
(b) May not be stockpiled or disposed of
unless authorized by the Maryland Department of the Environment;
(c) May not be distributed or sold to the
general public;
(d) Is restricted
to distribution for use as a final, intermediate, or alternate daily landfill
cover, as provided by COMAR 26.04.07, or on marginal land or in land
reclamation efforts if applied at rates not to exceed limits established in
Table 2 of Regulation .12 of this chapter; and
(e) Includes any compost exceeding any
parameter limit for Limited Use compost, as provided in Regulation .05C of this
chapter, or any compost designated by the registrant as Restricted Use
classification.
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.