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Biosolids and residuals Fact sheet on biosolids Production and marketing N-Viro™ Soil specifications and use Quality control Environmental management system Meeting standards

Biosolids monitoring

Consistent with previous years, biosolids at Metro and Baldwinsville were monitored in 2001 and a trend analysis was generated weekly comparing the quality of the biosolids to monthly permit limits (except for molybdenum where the USEPA 503.13 ceiling concentration limit of 75 mg/kg dry weight applies). The monthly average of Metro and Baldwinsville biosolids are required to meet the "Maximum Concentration" input to N-Viro™ Soil (the NYSDEC 360-4.4 permit limits for land application).

Weekly analytical results of the dewatered biosolids samples composited from daily grab sub-samples were compared to the permit limits (or applicable EPA 503-1.3 regulations), which are more stringent and are required to be met by the final N-Viro™ processed product. "Baseline" and "action levels" established in the dewatered biosolids serve as trigger values for rises in concentrations of metals and to provide sufficient time for appropriate action to determine the source/cause of the rise in metals concentrations to this action level and to ensure that compliance with biosolids regulations is maintained.

Annual average concentration

In 2001, the concentration of metals in the Metro treatment plant dewatered biosolids showed similar results to previous years with a slight increase in some metals and minor decreases in others. The Baldwinsville 2001 dewatered biosolids shows results were similar to the last several years.

Compliance

In 2001, all the analytical data complied with the NYSDEC 360-4.4 and USEPA 503-1.3 regulations for land application for both the Metro and Baldwinsville dewatered biosolids. The quality of the final N-Viro™ Soil product was in compliance with all applicable requirements.