All sewage treatment facilities which dispose of wastewater effluent by land disposal methods in the Lake Houston watershed shall provide secondary treatment as specified in §§309.1-309.4 of this title (relating to Introduction and Purpose; Rationale for Effluent Sets; Application of Effluent Sets; and Table 1, Effluent Standards for Domestic Wastewater Treatment Plants) prior to discharge into storage ponds for land disposal. Storage ponds and land disposal facilities shall be designed, constructed, and operated in accordance with §317.10(c) of this title (relating to Appendix B--Land Disposal of Sewage Effluent).