... guidelines, U.S. Environmental ProtectionAgency, Office of Water, EPA 816-R-9 7-0 05, February 1997.Manual for Evaluating Secondary Impacts of Wastewater Treatment Facilities, U.S. Environmental ... U.S. Environmental Protection Agency, 1978, 35 .The clean water state revolving fund, U.S. Environmental Protection Agency, Office of Water,EPA 832 -R-9 5-0 01, January 1995. © 1999 by CRC Press ... evalua-tion of primary and secondary impacts. A detailed discussion of sampling techniquesis found in Environmental Regulations, Chapters 6 and 7, by K. M. Mackenthun and J. I. Bregman.7.5.2 IMPACT...