(a) Operators shall verify that compost produced at an in-vessel digestion facility (pursuant to section 17896.57(a)(2)) meets the maximum metal concentrations limits specified in section 17896.59, and the pathogen reduction requirements specified in section 17896.60. This verification shall be performed by taking and analyzing a composite sample. The sampling of compost produced at an in-vessel digestion facility shall occur prior to the point where the compost is removed from the site or beneficially used on site. Test results of samples must be received by the operator prior to removing compost from the in-vessel digestion facility where it was produced.
(b) Sampling shall be performed by taking and analyzing at least one composite sample, following the requirements of this section as follows:
(1) An operator shall take and analyze one composite sample for every 5,000 cubic-yards of compost produced. If the in-vessel digestion facility produces less than 5,000 cubic-yards of compost in a 12 month period, the operator shall analyze at least one composite sample every 12 month period.
(2) Composite sample analysis for maximum acceptable metal concentrations, specified in section 17896.59, shall be conducted at a laboratory certified by the California Department of Public Health, pursuant to the Health and Safety Code.
(c) A composite sample shall be representative and random, and may be obtained by taking twelve (12) mixed samples as described below.
(1) The twelve samples shall be of equal volume.
(2) The twelve samples shall be extracted from within the post-digested solids or compost pile as follows:
(A) Four samples from one-half the width of the pile, each at a different cross-section;
(B) Four samples from one-fourth the width of the pile, each at a different cross-section; and,
(C) Four samples from one-eighth the width of the pile, each at a different cross-section.
(d) The EA may approve alternative methods of sampling that ensures the maximum metal concentration requirements of section 17896.59, and the pathogen reduction requirements of section 17896.60, as applicable, are met.
Note: Authority cited: Sections 40502, 43020 and 43021, Public Resources Code. Reference: Sections 43020 and 43021, Public Resources Code.
1. New section filed 11-10-2015; operative 1-1-2016 (Register 2015, No. 46).
This database is current through 5/19/23 Register 2023, No. 20.
Cal. Admin. Code tit. 14, § 17896.58, 14 CA ADC § 17896.58