(a) Pathogens--sewage sludge (other than domestic septage). The Class A pathogens requirements in Sec. 503.32(a) or one of the Class B pathogen requirements in Sec. 503.32 (b)(2) through (b)(4) shall be met when sewage sludge is placed on an active sewage sludge unit, unless the vector attraction reduction requirement in Sec. 503.33(b)(11) is met.
(b) Vector attraction reduction--sewage sludge (other than domestic septage). One of the vector attraction reduction requirements in Sec. 503.33 (b)(1) through (b)(11) shall be met when sewage sludge is placed on an active sewage sludge unit.
(c) Vector attraction reduction--domestic septage. One of the vector attraction reduction requirement in Sec. 503.33 (b)(9) through (b)(12) shall be met when domestic septage is placed on an active sewage sludge unit.