S.C. Code Regs. § ch. 61, 61-56, 61-56.400, app 61-56.400.Q
(1) Site/Permitting Requirements
(a) This Standard shall not apply to the following:
(i) Projects where two (2) or more pieces of deeded property will share a common system.
(ii) Residential or commercial projects where the individual or combined peak sewage flow is estimated to be in excess of fifteen hundred (1500) gpd.
(iii) Projects that discharge wastes containing high amounts of fats, grease and oil, including restaurants and other food service facilities, unless the system manufacturer certifies that the proposed system is designed to treat such high strength wastes.
(iv) Industrial process wastewater.
(b) A site may be considered for a specialized onsite wastewater system design if written documentation provided by a Registered Professional Engineer licensed in South Carolina, including soil studies performed by a licensed person meeting the criteria of Section 102.1(2)(b) or (c), indicates that the proposed system will function satisfactorily and in accordance with all requirements of this regulation. Such substantiating documentation must include the following:
(i) A Soils Report from a licensed person meeting the criteria of Section 102.1(2)(b) or (c) including detailed soil profile descriptions and Soil Series classification(s) utilizing methods and terminology specified in the Field Book for Describing and Sampling Soils; depth to the zone of saturation utilizing methods and terminology outlined in Redoximorphic Features for Identifying Aquic Conditions, and other appropriate principles specified in Soil Taxonomy; the depth to restrictive horizons; and a description of topography and other pertinent land features.
(ii) For drain field and replacement areas with a less than fifteen (15) inch zone of saturation, no part of a specialized onsite wastewater system may be installed within one hundred twenty-five (125) feet of the critical area line or tidal waters as determined by the Department or within seventy-five (75) feet of the ordinary high water elevation within the banks of non-tidal, environmentally sensitive waters.
(iii) There shall be a replacement area equivalent to at least fifty (50) percent in size of the original system area held in reserve for system repair. This area shall have a suitable configuration and shall meet the minimum soil and site conditions of this regulation.
(iv) A plan that has been sealed, signed and dated by a Registered Professional Engineer licensed in South Carolina certifying that the proposed onsite wastewater system has been designed in accordance with the requirements of this regulation and will function satisfactorily. The plan should also show an area equivalent to at least fifty (50) percent in size of the original system held in reserve for system repair.
(v) The manufacturer's recommendations for operation and maintenance of the system, and the consulting Registered Professional Engineer's management plan to meet this. For systems that have mechanical components and/or require a higher degree of maintenance to ensure the proper treatment and disposal of Domestic Wastewater, an operation and maintenance (O&M) plan must be developed by the designing Registered Professional Engineer to be given to the party who is ultimately responsible for the operation of the system. O&M plans must be recorded along with the property deed and must run with the land.
(c) Any permit to construct that is issued pursuant to this standard shall be based upon the consulting Registered Professional Engineer's design, certification, and other supporting documentation provided by the licensed person meeting the criteria of Section 102.1(2)(b) or (c).
(d) The consulting Registered Professional Engineer shall be responsible for supervising construction of the system and providing the Department with a certified as-built plan of the actual installation containing all details required by the Department. The certified as-built plan must be submitted to the Department within two (2) business days of completing the system installation. If the construction schedule for a specialized system installation is more than forty-eight (48) hours, the Department must be notified in advance of the beginning of construction. Any Final Approval that is released pursuant to this standard shall be based upon this engineering certification.
S.C. Code Regs. ch. 61, 61-56, 61-56.400, app 61-56.400.Q