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Contents : COUNTY OF SUFFOLK STEVE LEVY SUFFOLK COUNTY EXECUTIVE SUFFOLK COUNTY DEPARTMENT OF HEALTH SERVICES DIVISION OF ENVIRONMENTAL QUALITY STANDARDS APPROVAL OF PLANS AND CONSTRUCTION - SEWAGE DISPOSAL SYSTEMS FOR SINGLE-FAMILY RESIDENCES Humayun J. Chaudhry D.O. M.S. Commissioner of Health Services Vito Minei P.E. Director of Environmental Quality November 13 1995 SECTION 5-101 5-102 5-103 5-104 5-105 5-106 5-107 5-108 5-109 5-110 5-111 5-112 5-113 5-114 5-115 5-116 5-117 5-118 5-119 5-120 Introduction Definitions Applicable to These Standards Prohibitions of Subsurface Sewage Disposal Systems Plans/Permits/Approvals Required Siting of Subsurface Sewage Disposal Systems Subsoil and Groundwater Criteria for Subsurface Systems Minimum System Requirements Construction Material Requirements Septic Tank Requirements Leaching Pool Requirements Cover Requirements Distribution Box and Manhole Requirements Sewer Line Requirements Alternative Systems Other Systems Separation of Water and Sewer Lines Final Grading and Backfilling Sewage Ejector Systems Variances Approval by the Commissioner of Health Services PAGE 1 1 3 3 4 6 7 7 8 9 10 11 12 13 13 14 15 15 16 16 i TABLES No. 1 No. 2 No. 3 No. 4 Minimum Separation Distances to Sewage Disposal Systems Minimum Septic Tank Capacities Minimum Leaching System Design For A One To Four Bedroom Residence Minimum Leaching System Design For A Five Or Six Bedroom Residence PAGE 17 17 18 18 FIGURES No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 7 No. 8 No. 9 Typical Rectangular Septic Tank Typical Cylindrical 1250 Gallon Septic Tank with Slab Typical Cylindrical 1500 Gallon Septic Tank with Dome Typical Leaching Pool Typical Sewage Systems For One To Four Bedroom Residence Typical Sewer Line Cleanouts Typical Distribution Box Alternative Sewage Disposal System for High Groundwater Alternative to Distribution Box 19 20 21 22 23 24 25 26 27 ii STANDARDS APPROVAL OF PLANS AND CONSTRUCTION -SEWAGE DISPOSAL SYSTEMS FOR SINGLE-FAMILY RESIDENCES 5-101 INTRODUCTION A. The purpose of these standards is to assure a safe sanitary means of disposing of household wastewater. Properly designed maintained and operated sewage disposal systems minimize the possibility of disease transmission and the potential for contamination of ground and surface waters. These are Standards for the Suffolk County Department of Health Services for the Administration of Section 760-502 of Article 5 (Sewage Disposal) and Section 760-710 of Article 7 of the Suffolk County Sanitary Code. Facilities designed and constructed in compliance with these Standards will be in compliance with these sections of the Suffolk County Sanitary Code. The information presented in these Standards applies to buildings used as a single-family residence(s) and only addresses sewage as herein defined. Other solid liquid or gaseous emissions are subject to a separate review and approval by the Department. For details relating to other than single-family residences refer to "Standards for Approval of Plans and Construction for Sewage Disposal Systems for Other Than Single-Family Residences". B. C. 5-102 DEFINITIONS APPLICABLE TO THESE STANDARDS Absorption Area - An area to which wastewater is distributed for infiltration to the soil. Alternative System - A subsurface sewage disposal system which contains components or design elements not explicitly described in these Standards. Backfill - 1) The operation of refilling an excavation usually after some structure or pipe has been placed therein 2) the material placed in an excavation in the process of backfilling. Building Sewer - The sewer line which extends from the building to the sewage disposal or sewer system. Department - The Suffolk County Department of Health Services. Design Flow - The volume of sewage to be used for the purpose of designing the size of the sewage disposal system. Design Professional - a person licensed or registered in the State of New York and authorized by the State Education Law to design the systems described in these Standards. Page 1 Groundwater - The subsurface water occupying the zone of saturation below the established water table. Hydraulic Loading - The daily design volume of sewage discharged from the site. Leaching Area - The sidewall absorption area in a leaching pool below the inlet pipe. Leaching Pool - A covered pit constructed with a perforated reinforced concrete wall through which septic tank effluent will infiltrate the surrounding soil. Perched Groundwater - Groundwater which is separated from the main body of groundwater by an aquiclude (e.g. a clay lens). Sewage - The combination of human and household waste with water which is discharged to the home plumbing system including the waste from a flush toilet bath sink lavatory dishwashing or laundry machine or the water-carried waste from any other fixture equipment or machine together with such groundwater infiltration and surface water as may be present. Septic Tank - A watertight chamber used for the settling stabilizing and anaerobic decomposition of sewage. Sewage Disposal System - Any plumbing or conveyances which result in or are capable of resulting in a discharge of sewage. This includes but is not limited to building sewers septic tanks leaching pools sumps tile fields holding tanks treatment works outfalls and connecting piping. The term may also refer to a part of a larger disposal system. Sewer Line - A pipe designed to convey sewage. Sewer System - (also referred to as sewerage system public sanitary sewer municipal sewage disposal system privately owned communal sewerage system and communal sewage disposal system) Pipe lines conduits pumping stations and force mains and all other constructions devices and appliances appurtenant thereto used for conducting sewage to a point of ultimate disposal. Single-Family Residence - A dwelling unit one or more rooms with provision for living cooking sanitary and sleeping facilities arranged for the use of one family. Subsurface Sewage Disposal System - A sewage disposal system designed to treat and dispose of septic tank or other treatment facility effluent by application of the effluent to a soil surface at a depth below the surface of the ground. Treatment Works - A facility designed for the purpose of removing certain constituents from sewage by mechanical means and stabilizing and disposing of sewage. Page 2

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