General Permit for Biosolids Management - Washington State ...

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General Permit for Biosolids Management Page 26 Table 4 - Allowable Biosolids Pollutants and Loading Rates (adapted from WAC 173-308-160) WAC 173-308-160 Table 1 WAC 173-308-160 Table 2 WAC 173-308-160 Table 3 Pollutant Ceiling Limits Cumulative Loading Rates Pollutant Limits Arsenic 75 mg/kg 41 kg/ha 41 mg/kg Cadmium 85 mg/kg 39 kg/ha 39 mg/kg Copper 4300 mg/kg 1500 kg/ha 1500 mg/kg Lead 840 mg/kg 300 kg/ha 300 mg/kg Mercury 57 mg/kg 17 kg/ha 17 mg/kg Molybdenum 75 mg/kg Not applicable Not applicable Nickel 420 mg/kg 420 kg/ha 420 mg/kg Selenium 100 mg/kg 100 kg/ha 100 mg/kg Zinc 7500 mg/kg 2800 kg/ha 2800 mg/kg 10.4. Pathogens The biosolids must meet either one of the Class A standards in WAC 173-308-170(1)-(4) or one of the Class B standards in WAC 173-308-170(5)-(7). 10.5. Vector Attraction Reduction The biosolids must meet either one of the vector attraction reduction standards in WAC 173-308-180 or be managed to reduce vector attraction in the field as described in Subsections 10.5.1 or 10.5.2. 10.5.1. Injection The biosolids must be injected so that no significant amount of the biosolids is on the surface within 1 hour after injection. If the biosolids are Class A for pathogens, and injection is being used to meet the vector attraction reduction requirements, injection must occur within 8 hours after being discharged from the pathogen treatment process. 10.5.2. Incorporation The biosolids must be incorporated into the soil within 6 hours after application. If the biosolids are Class A for pathogens, and incorporation is being used to meet the vector attraction reduction requirements, application must occur within 8 hours after being discharged from the pathogen treatment process. 10.6. Site Management and Public Access Restrictions for Class B Biosolids The site management and public access restrictions in this subsection apply to biosolids that are Class B for pathogens when they are applied to the land. 10.6.1. Crop Harvest Waiting Periods The time between the last application of Class B biosolids and crop harvesting must adhere to the waiting periods in Table 5.
General Permit for Biosolids Management Page 27 Table 5 - Crop Harvesting Restrictions for Class B Biosolids Crop Type Above ground food crops Above ground food crops Examples Does the harvested part of plant contact biosolids? Length of time the biosolids remain on soil surface Waiting period until harvest is allowed Cherries, wheat No Not applicable 30 days Lettuce, cucumbers Yes Not applicable 14 months Root food crops Onions, potatoes Yes >4 months 20 months Root food crops Onions, potatoes Yes
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