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MWMC FACILITIES PLAN Biosolids Quality According to current state and new federal regulations (40 CFR, Part 503), biosolids samples should be analyzed for the parameters listed in Table 5.1.4-1. TABLE 5.1.4-1 Sampling Requirements for EPA 40 CFR, Part 503, Sludge Regulationsa MWMC Facility Plan, Eugene-Springfield Parameter Units Arsenic mg/kg dry weight Beryllium mg/kg dry weight Cadmium mg/kg dry weight Copper mg/kg dry weight Lead mg/kg dry weight Mercury mg/kg dry weight Molybdenum mg/kg dry weight Nickel mg/kg dry weight Selenium mg/kg dry weight Zinc mg/kg dry weight Total Nitrogen % dry weight Nitrate nitrogen % dry weight Ammonia nitrogen % dry weight Phosphorus % dry weight Potassium % dry weight pH standard units Total solids % dry weight Volatile solids % dry weight PCBsb pg/kg a From 40 CFR, Part 503 (December 1992). b PCBs include PCB-1016,-1221,-1232,-1242,-1248,-1254, and -1260. The nitrogen, phosphorus, and potassium content of the biosolids are important when applying biosolids at agronomic rates. Nitrogen content can vary significantly in the biosolids depending on its source, age, and history. The concentration levels of these nutrients should be determined from samples taken immediately prior to biosolids application because stored biosolids can lose nitrogen rapidly. Therefore, it is important that the real nitrogen content of the biosolids is known to avoid under- or over-application. The available nitrogen in the biosolids was determined assuming the following: · 15-20 percent of the organic nitrogen will be available ( Cogger, Sullivan, et. al. indicate lagoon stored biosolids typically mineralize organic nitrogen in 15 to 20 percent range) · 50 percent of the ammonia nitrogen will be available · 100 percent of the nitrate-nitrite nitrogen will be available 5-14 MWMC_5.0_REVS_VKS.DOC