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Definition of terms and their use in the Standards are in accordance with the GLOSSARY - WATER AND WASTEWATER CONTROL ENGINEERING, published by APHA, ASCE, AWWA and WEF, formerly WPCF. The units of expression used are in accordance with those recommended in Manual of Practice Number 6, Units of Expression for Wastewater Treatment, published by the WEF, formerly WPCF, Water Pollution Control Federation. Reference to Standards or Specifications shall mean the latest version available.