Minimum requirements

(a) Each subsurface sewage disposal system shall be constructed, repaired, altered or extended pursuant to the requirements of this section unless an exception is granted in accordance with the following provisions: (1) A local director of health may grant an exception, except with respect to the requirements of Section 19-13-B103d (d) and Technical Standard IIA, for the repair, alteration, or extension of an existing subsurface sewage disposal system where he determines the repair, alteration or extension cannot be affected in compliance with the requirements of this section and upon a finding that such an exception is unlikely to cause a nuisance or health hazard. All exceptions granted by the local director of health shall be submitted to the Commissioner of Health Services within thirty days after issuance on forms provided by the Department. (2) The Commissioner of Health Services may grant an exception to the requirements of Section 19-13-B103d (d) upon written application and upon a finding that: (A) A central subsurface sewage disposal system serving more than one building is technically preferable for reasons of site limitations, or to facilitate construction, maintenance or future connection to public sewers, or; (B) A subsurface sewage disposal system not located on the same lot as the building served is located on an easement attached thereto. Such easement shall be properly recorded on the land records and shall be revokable only by agreement of both property owners and the Commissioner of Health Services. (3) The Commissioner of Health Services may grant an exception to the requirements of Technical Standard IIA, upon written application and upon a finding that such an exception is unlikely to pollute the well in such a manner as to cause a health hazard. (b) Technical standards. Subsurface sewage disposal systems within the scope of this regulation shall be designed, installed and operated in accordance with the technical standards established in the "Technical Standards for Subsurface Sewage Disposal Systems" published by the Commissioner of Health Services. The Technical Standards shall be reviewed annually and changes to the Technical Standards shall be available on January 1st of each year. (c) Large subsurface disposal systems. The Commissioner of Health Services shall approve plans for subsurface sewage disposal systems serving a building with a designed sewage flow of two thousand gallons per day or greater, and no such systems shall be constructed, repaired, altered or extended unless the plans for such systems are approved by the Commissioner in accordance with the following: (1) Plans for the system are submitted at least twenty days prior to approval to construct by the local director of health. (2) The plans are designed by a professional engineer registered in the State of Connecticut. (3) The plans submitted contain: (A) The basis of design, (B) Soil conditions and test pit locations, (C) Maximum ground water and ledge rock elevations, (D) Original and finished surface contours and elevations, (E) Property lines, and (F) Locations of buildings, open water courses, ground and surface water drains, nearby wells and water service lines. (d) Location. Each building shall be served by a separate subsurface sewage disposal system. Each such system shall be located on the same lot as the building served. (e) Disposal of sewage in areas of special concern. (1) Disposal system for areas of special concern shall merit particular investigation and special design, and meet the special requirements of this subsection. The following are determined to be areas of special concern: (A) A minimum soil percolation rate faster than one inch per minute, or (B) Slower than one inch in thirty minutes, or (C) Maximum ground water less than three feet below ground surface, or (D) Ledge rock less than five feet below ground surface, or (E) Soils with slopes exceeding twenty-five per cent, or (F) Consisting of soil types interpreted as having severe limitations for on-site sewage disposal by most recent edition of the National Cooperative Soil Survey of the Soil Conservation Service, or (G) Designated as wetland under the provisions of Sections 22a-36 through 22a-45 of the Connecticut General Statutes, as amended. (H) Located within the drawdown area of an existing public water supply well with a withdrawal rate in excess of fifty gallons per minute, or within five hundred feet of land owned by a public water supply utility and approved for a future wellsite by the Commissioner of Health Services. (2) In such areas of special concern, the local director of health may require investigation for maximum ground water level to be made between February 1 and May 31, or such other times when the ground water level is determined by the Commissioner of Health Services to be near its maximum level. (3) (A) Plans for new subsurface systems in areas of special concern shall: (i) Be prepared by a professional engineer registered in the State of Connecticut; (ii) Include all pertinent information as to the basis of design, and soil conditions, test pit locations, ground water and ledge rock elevations, both original and finished surface contours and elevation, property lines, building locations, open water courses, ground and surface water drains, nearby wells and water service lines; (iii) Demonstrate an ability to solve the particular difficulty or defect associated with the area of special concern and which caused its classification. The Commissioner or local director of health, as the case may be, may require a study of the capacity of the surrounding natural soil to absorb or disperse the expected volume of sewage effluent without overflow, breakout, or detrimental effect on ground or surface waters if in their opinion such may occur. (B) The plans for new subsurface disposal systems in areas of special concern shall be submitted to the local director of health and the Commissioner of Health Services for a determination as to whether the requirements of the subsection have been met, except that such submission need not be made to the Commissioner of Health Services if the local director or authorized agent has been approved to review such plans by the Commissioner of Health Services in accordance with Section B103e (b). All submissions to the Commissioner of Health Services shall be made at least 20 days prior to issuance of an approval to construct by the local director of health. (4) If application is made for the repair, alteration or extension of an existing subsurface disposal system in an area of special concern, the local director of health may require that the applicant comply with the requirement of Subdivision (3) if he determines that the contemplated repair, alteration or extension involves technical complexities which cannot reasonably be addressed by himself, his authorized agent or the system installer. (5) While a sewage disposal system in an area of special concern is under construction, the local director of health may require that the construction, be supervised by a professional engineer registered in the State of Connecticut, if in the opinion of the local director of health it is necessary to insure conformance to the plans approved or because of the difficulties likely to be encountered. The engineer shall make a record drawing of the sewage disposal system, as installed, which he shall submit to the local director of health prior to issuance of a discharge permit. (6) In such areas of special concern, the Commissioner of Health Services or the local director of health who has been approved by the Commissioner to review engineering plans in areas of special concern pursuant to Section 19-13-B103e (b) may require a study of the capacity of the surrounding natural soil to absorb or disperse the expected volume of sewage effluent without overflow, breakout, or detrimental effect on ground or surface waters. (f) Gray water systems. Disposal systems for sinks, tubs, showers, laundries and other gray water from residential buildings, where no water flush toilet fixtures are connected, shall be constructed with a septic tank and leaching system at least one-half the capacity specified for the required residential sewage disposal system.