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5 BASIS OF PLANNING <br /> <br />Total Dissolved Solids (TDS) <br />The TDS standard ht the Willamette l~Jver is 100 mg/L There are currently no compliance <br />issues with respect to effluent quality and TDS. Any numerical 1Lmit Ls urdikely to affect <br />future recommended treatment technologies at the WPCF. However, alternative disinfection <br />practices such as the addition of sodium hypochlorite can significantly increase TDS <br />discharges. <br /> <br />Dioxins and Furans <br />A toxic eqttivalency factor approach for the human health criteria for dioxins and b~rans was <br />considered by the DEQ for ~clusion in the proposed changes for Oregor~ water quality <br />standards, but at the time of writing it appears that this wilt not be included in the standards <br />revision package to be considered by the EQC, cttrrently planned for May 2004. Any limits for <br />dio×irLS and furans are unlikely to affect future recommended treatment technologies at the <br />WPCF and will likely be implemented as source control reductions. <br /> <br />5.1.4 Biosolids Quality <br />Both federal and state regulations apply to land application of biosolids from wastewater <br />treatment plants (WWTPs). Federal regulations include 40 CFR 257 and approved 40 CFR, <br />Part 503. State of Oregon regulations include OAR 340-50. Since the passing of the federal <br />503 regulations, the state has prepared and passed amendments to OAR 340-50 that adopt <br />provisions outlined tn the 503 regulation. <br /> <br />For disposal of biosolids as interrm cover or as fill at a solid waste landfill, federal <br />regulations 40 CFR, Part 258, apply. If the biosolids is incorporated in the final cover for the <br />landfill, the 503 regulations would st~ apply. <br /> <br />State regulations take precedence over federal regulations, where applicable. In some <br />instances, state regulations may impose more stringent requirements than federal <br />regulations. However, federal regulations apply if no state regulations are declared. <br /> <br />Regulations <br />Current federal regulations for land treatment of biosolids are listed in the Federal Register <br />under 40 CFR, Part 257, "Criteria for Classification of SoLid Waste Disposal Fac~ities and <br />Practices," dated September 13, 1979. Lr~ the past, Part 257.3-5 has regulated solid waste <br />application to food crops; however, these regulations have been corrsidered too general. <br />Therefore, new regulations under 40 CFR, Part 503, were required by Section 405 (d) of the <br />Clean Water Act of 1977 (as amended by the Water Quality Act of 1987). <br /> <br />The new regulations under 40 CFR, Part 503, have gone through several scientific <br />community and public reviews and were released as final in late 1992. <br /> <br /> In December 1984, DEQ defined rules for the land application a~d dLsposal of sewage <br /> treatment plant biosolids and biosolids-derived products, including septage (OAR 340-50). <br /> These regulations are currently in the process o£ being updated to conform to the adopted <br /> federal regula~ons. <br /> <br /> MWMC_5 0._REVS_VKS.DOC 5- ~ 3 <br /> <br /> <br />