California Code of Regulations
Title 27 - Environmental Protection
Division 2 - Solid Waste
Subdivision 1 - Consolidated Regulations for Treatment, Storage, Processing or Disposal of Solid Waste
Chapter 7 - Special Treatment, Storage, and Disposal Units
Subchapter 2 - Confined Animals
Article 1 - SWRCB-Confined Animal Facilities
Section 22562 - SWRCB - Wastewater Management. (C15: Section 2562)

(a) Design Storm (for Run-On/Run-Off Control)--Confined animal facilities shall be designed and constructed to retain all facility wastewater generated, together with all precipitation on, and drainage through, manured areas during a 25-year, 24-hour storm.

(b) Manured Area Run-On Exclusion--All precipitation and surface drainage outside of manured areas, including that collected from roofed areas, and runoff from tributary areas during the storm events described in ¶(a), shall be diverted away from manured areas, unless such drainage is fully retained. RWQCBs can waive application of such requirements only in specific instances where upstream land use changes have altered surface drainage patterns such that retention of flood flows is not feasible.

(c) Design Storm (for Flood Protection).

(d) Retention Pond Design--Retention ponds shall be lined with, or underlain by, soils which contain at least 10 percent clay and not more than 10 percent gravel or artificial materials of equivalent impermeability.

(e) Discharge To Disposal/Use Fields--The RWQCB shall allow the discharge of facility wastewater and of collected precipitation and drainage waters to use or disposal fields only if such discharge is in accordance with § 22563. Absent an NPDES permit for discharge to surface waters, the only other allowable discharge is to wastewater treatment facilities approved by the RWQCB.