Difference between revisions of "Compost"

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Revision as of 12:20, 28 July 2017

Compost shall be stable, humus-like material produced from the aerobic decomposition of organic feedstocks, composted and cured until maturity. Compost shall be certified to comply with mandatory Ontario Compost Quality Standards for Category ‘AA’ or ‘A’ Compost for concentrations of the 11 regulated metals, pathogens, foreign matter, maturity and labelling (OMOECC 2012) and Canadian Food and Inspection Agency (CFIA) regulations T-4-93 (CFIA 1997a) and T-4-120 (CFIA 1997b).

Compost shall also be certified to meet quality parameters recommended under the Compost Council of Canada’s Compost Quality Alliance (CQA) certification program (A&L Canada Laboratories 2004) through testing by an accredited soil laboratory (OMAFRA 2016):


Specifications
ParameterAcceptable range
pH5.5 - 8.5
Soluble Salts (EC)< 5 mS/cm
Moisture Content< 50% by weight
Organic matter> 30% by dry weight
C/N ratio12 to 22
PathogensOMOECC 2012
MaturityOMOECC 2012
Particle size100% < 12.7 mm (1/2”)
Foreign Material> 1.0% by dry weight > 3 mm
< 0.5% plastic by dry weight
no foreign matter > 25 mm per 500 mL
no sharp foreign matter that could cause harm to humans or animals.
Arsenic≤ 13 mg/kg dry weight
Cadmium≤ 20 mg/kg dry weight
Chromium≤ 210 mg/kg dry weight</td
Cobalt≤ 34 mg/kg dry weight
Copper≤ 400 mg/kg dry weight
Lead≤ 150 mg/kg dry weight
Mercury≤ 0.8 mg/kg dry weight
Molybdenum≤ 5 mg/kg dry weight
Nickel≤ 62 mg/kg dry weight
Selenium≤ 2 mg/kg dry weight
Sodium, Percent Saturation< 2%
Zinc≤ 700 mg/kg dry weight


Where the custom calculated depth of compost amendment exceeds 7 centimetres (cm), or concentrations of any of the 11 regulated metals are near the maximum allowable limit, use Appendix 7 of Ontario Compost Quality Standards (OMOECC 2012) to determine the maximum application rate that will not exceed CFIA regulations for metals loading over a 45 year time period (CFIA 1997a).

The Contractor shall submit to the Owner’s Representative a 4L sample, with laboratory testing results or quality assurance documentation certifying that the material or product meets the requirements.