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T-3 Bioretention
Table B-1. Class 1 Compost
Characteristic
Minimum Stability Indicator (Respirometry)
Criteria
Stable to Very Stable
Maturity Indicator Expressed as
Ammonia N / Nitrate N Ratio
Maturity Indicator Expressed as
Carbon to Nitrogen Ratio
Maturity Indicator Expressed as
80+ / 80+
Percentage of Germination/Vigor
pH – Acceptable Range 6.0 – 8.4
Soluble Salts – Acceptable Range
0 – 5 mmhos/cm
(1:5 by weight)
Seal of Testing Assurance (STA)/Test
Testing and Test Report Submittal Requirement Methods for the Examination of
Composting and Compost (TMECC)
Equal or better than US EPA Class A
Chemical Contaminants
Standard, 40 CFR 503.13, Tables 1 & 3
levels
Pathogens
< 4
< 12
Meet or exceed US EPA Class A standard,
40 CFR 503.32(a) levels
B-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3