California Code of Regulations
Title 14 - Natural Resources
Division 7 - Department of Resources Recycling and Recovery
Chapter 3.2 - In-Vessel Digestion Operations and Facilities Regulatory Requirements
Article 6 - Digestate Handling Standards
Section 17896.59 - Maximum Metal Concentrations
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Compost produced at an in-vessel digestion facility (pursuant to section 17896.57(a)(2)) shall not exceed the maximum acceptable metal concentrations shown in Table 2. Compost that contains any metal in amounts that exceed the maximum acceptable metal concentrations shown in Table 2 shall be designated for additional processing, disposal, or other use as approved by local, state and federal agencies having appropriate jurisdiction. Test results of samples must be received by the operator prior to removing compost from the in-vessel digestion facility where it was produced.
Table 2--Maximum Acceptable Metal Concentrations
| Constituent | Concentration (mg/kg) on dry weight basis | |
| Arsenic (As) | 41 | |
| Cadmium (Cd) | 39 | |
| Chromium (Cr) | (see subdivision (a)(1) below) | |
| Copper (Cu) | 1500 | |
| Lead (Pb) | 300 | |
| Mercury (Hg) | 17 | |
| Nickel (Ni) | 420 | |
| Selenium (Se) | 100 | |
| Zinc (Zn) | 2800 |
(b) Alternative methods of compliance to meet the requirements of this section may be approved by the EA if the EA determines that the alternative method will ensure that the maximum acceptable metal concentrations shown in Table 2 are not exceeded.
1. New section filed 11-10-2015; operative 1-1-2016 (Register 2015, No. 46).
Note: Authority cited: Sections 40502, 43020 and 43021, Public Resources Code. Reference: Sections 43020 and 43021, Public Resources Code.
