(a) The safety aspects of a wastewater treatment facility design must be based on Design of Municipal Treatment Plants, WEF Manual of Practice No. 8, 5th edition, 2009, published by the Water Environment Federation. Other safety design guidelines may be used only if submitted in the design submittal and approved in writing by the executive director.
(b) Occupational safety and health hazards, and risks to workers and the public, must be addressed in the design of collection system and wastewater treatment facility equipment and processes.
(c) The design of a wastewater treatment facility must incorporate processes that use the least hazardous and least toxic chemicals and the smallest amounts of those chemicals that will effectively treat and disinfect the influent so that the effluent and sludge meet the requirements in the associated wastewater permit, and do not degrade the water quality in a receiving stream or cause accumulation of hazardous or toxic chemicals in a land application area.
(d) Where applicable, a design must follow the guidelines pursuant to 29 Code of Federal Regulations, Part 1910.

Source Note: The provisions of this §217.321 adopted to be effective August 28, 2008, 33 TexReg 6843; amended to be effective December 4, 2015, 40 TexReg 8254