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FAQ: For biosolids generators
FAQ: For biosolids generators
Biosolids are nutrient-rich organic materials, which remain following the treatment of domestic sewage at a wastewater treatment plant (WWTP). Biosolids undergo additional treatment processes to stabilize the materials and kill pathogens prior to being utilized as a soil amendment and conditioner. Michigan’s Biosolids Program is regulated by EGLE’s Water Resources Division (WRD), under the authority of Part 31 of the Water Resources Protection of the Natural Resources and Environmental Protection Act, 1994 PA 451, Michigan’s Part 24 Administrative Rules.
Do you have a question about Michigan's Biosolids Program and regulations? Contact our biosolids program specialists.
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What happens to PFAS when its land applied in biosolids and what precautions are being taken?
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My facility land applies biosolids in the spring and fall and generates less than 320 dry tons per year. Why are we required to sample once before each hauling period (twice per year) when Rule 2412, Table 7, of the Michigan Part 24 Rules requires facilities that generate less than 320 dry tons per year, to collect and analyze a minimum of 1 sample per year in each year they land apply?
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My facility generates about 400 dry ton tons per year and collects quarterly samples as required for facilities that generate over 320 dry tons. This year my fourth quarterly sample had concentrations of cadmium above Table 3. Pollutant Concentrations of the Part 24 Rules. I understand that Rule 2412(4) of the Part 24 Rules requires that if pollutant levels exceed Table 3 concentrations, then the sample frequency shall double that provided in Table 7. In this scenario, are we required to collect a total of 8 samples in the same reporting year and how long do we need to continue the double sample frequency?
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We are preparing to remove the biosolids from our lagoon and land apply them next spring. Based on our calculations, we have less than 320 dry tons of material to remove. We have not land applied biosolids in the last 5 years. Why does the Residuals Management Program (RMP) Development Document require a minimum of 3 biosolids samples?
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I understand that 40 CFR, Section 122.21(q)(7)(ii), requires biosolids applicants that generate less than 320 dry tons per year, collect a minimum of 3 samples for analysis. However, part of that citation states that the samples must be taken at least 1 month apart. I do not understand how requiring the samples to be 1 month apart would be useful for a wastewater stabilization lagoon system. Am I interpreting this requirement correctly? Are lagoon facilities that are wishing to land apply required to collect a minimum of 3 samples 1 month apart from each other?
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I am preparing to remove and land apply biosolids from one of our lagoon cells and collected 3 good composite samples for analysis as required. One of the 3 samples had cadmium concentrations slightly above the Table 3 concentrations. If I average the analytical result, they are well below Table 3 concentrations. Since the biosolids in the lagoon will be well mixed prior to pumping into the tanker for transport to the site, is averaging the results to stay below the Table 3 concentration acceptable?
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What is the appropriate method for calculating agronomic rate for applying biosolids?
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What is the appropriate method for determining useable site acreage?
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When we are land applying biosolids for more than 2 days in a row, why are we required to collect daily biosolids samples for percent total solids even though we have a percent total solids value on the sample we analyzed for metals?
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Can I temporarily transfer one of my listed land application sites to a neighboring wastewater treatment facility?
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I am a land application contractor and have been hired to help a community prepare an RMP for a lagoon cleaning we will be conducting. In order to save time, is it acceptable for us to submit the RMP on behalf of the community and have the facility sign the signature page and fax it to the EGLE District Office?
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In the isolations distance requirements in Rule 2410(11), Table 6, there appears to be some inconsistency in the definition of "municipal wells (type I or type IIA)" and the isolation distance requirements of "public water supplies (type I or type IIA)" in Rule 10812 of the Administrative Rules promulgated under the Michigan Safe Drinking Water Act, 1976 PA 399, as amended (Act 399). Can you provide some guidance in defining the appropriate setbacks?