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Where reliable and good quality data are not available on the stream or a substantially similar stream, then the method(s) described in each chapter of Appendix A for estimating the hazards based on the information known will be applied to classify the stream (i.e., application of cut-off values/concentration limits).
The official, public domain, OSHA version of this document is available at https://www.osha.gov/OshDoc/Directive_pdf/CPL_02-02-079.pdf.