This amendment to the Water Quality Control Plan for the Santa Ana Region (Basin Plan) revises the requirements and exemption criteria for use of septic tank subsurface disposal systems on lots smaller than one-half acre, set forth in an earlier amendment. Specifically, this amendment (1) clarifies the calculation of gross project area, (2) clarifies the definition of new development, (3) allows for replacement of outdated systems, (4) establishes flow rates for commercial and industrial facilities, (5) sets minimum distances from the nearest sewer in the exemption criteria, (6) establishes an off-set program, and (7) provides for review of alternative treatment technologies.
Cal. Code Regs. Tit. 23, § 3970