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SEPTIC SYSTEM INSPECT DIAGNOSE REPAIR
SEPTIC CARE INSTRUCTIONS
SEPTIC D-BOX INSPECTION
SEPTIC DRAINFIELD FAILURE DIAGNOSIS
SEPTIC DYE TEST PROCEDURE
SEPTIC FAILURE SIGNS
SEPTIC INSPECTION & TEST GUIDE
SEPTIC LIFE EXPECTANCY
SEPTIC SUPPLIES & PARTS
SEPTIC SYSTEM DESIGN ALTERNATIVES
SEPTIC SYSTEM DESIGN BASICS
SEPTIC SYSTEMS, HOME BUYERS GUIDE to
SEPTIC SYSTEM SAFETY WARNINGS
SEPTIC TREATMENTS & CHEMICALS
SEWAGE BACKUP PREVENTION
SEWAGE EJECTOR / GRINDER PUMPS
SEWER GAS ODORS
SEWER LINE REPLACEMENT
SINKHOLES, WARNING SIGNS
SOAKAWAY BED FAILURE DIAGNOSIS
SULPHUR & SEWER GAS SMELL SOURCES
TOILETS, INSPECT, INSTALL, REPAIR
TRAPS on PLUMBING FIXTURES
TREATMENTS & CHEMICALS, SEPTIC
VIDEO GUIDES: Septic Videos
WATER CONSERVATION MEASURES
WATER SOFTENERS & CONDITIONERS
WATER SUPPLY & DRAIN PIPING
WATER, WELLS, WATER TANKS: TESTING GUIDE
WASHING MACHINES & SEPTIC SYSTEMS
WASTEWATER TREATMENT BASICS
WINTERIZE A BUILDING
Soil Percolation Tests or Perc Test Specifications: Section 4 of these model septic design regulations discusses the procedure for evaluating site and soil conditions in preparation for the design of a private septic system to handle onsite wastewater disposal.
For the installation of a conventional septic tank and leach field, minimum useable soil depth, percolation rates, leach field clearance distances, and the requirement for a future repair or expansion area are reviewed, and a table of separation distances from septic components to other site and building features is provided.
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Soil and site appraisal for off-grid or onsite wastewater treatment systems: septic drainfields, soakaway beds, percolation beds
This document uses the New York State wastewater treatment standard for individual household septic systems (Appendix 75-A) to provide an example of state regulated design and installation of both conventional tank and leach field septic systems and alternative septic system designs, including raised septic systems, septic mound systems, intermittent sand filter septic systems, and evaportion-transpiration septic systems. Effective Date: 12/01/90 Title: Appendix 75-A.4 -
To learn details about soil percolation tests and exactly how they are performed, or to see other examples of soil perc test specifications read Perc Tests: Soil Percolation & Soil Depth Requirements for Septic Absorption Systems / Septic Drainfields
See SEPTIC SYSTEM DESIGN BASICS for a description of the specifications and properties of most common septic systems such as tank and drainfield, soil & perc tests, septic tank pumping table, septic system treatment chemicals, and steep slope system designs.
See SEPTIC SYSTEM DESIGN ALTERNATIVES for a description of alternative septic system designers, products, and design specifications such as cesspools, disinfection systems, evaporation/transpiration, filters, fixed film gravelless, greywater, holding tanks, lagoons, media filters, mound septic designs, outhouses, peat filters, pressure dosing, raised beds, sequencing batch, steep slope, toilet alternatives, vegetated submerged beds, and wetland septic designs.
(a) Site Investigation
(1) Areas lower than the 10 year flood level are unacceptable for on-site systems. Slopes greater than 15% are also unacceptable.
(2) There must be at least four feet of useable soil available above rock, unsuitable soil, and high seasonal groundwater for the installation of a conventional absorption field system (75-A.8(b)).
(3) Soils with very rapid percolation rates (faster than one minute per inch) are not suitable for subsurface absorption systems unless the site is modified by blending with a less permeable soil to reduce the infiltration rate throughout the area to be used.
(4) Subsurface treatment systems and components of the sewage system shall be separated from buildings, property lines, utilities and wells, to maintain system performance, permit repairs and reduce undesirable effects of underground sewage flow and dispersion. The minimum separation distances are shown in Figures 1 and 2. Reduced separation distances may be approved upon request when the site evaluation by a design professional or soil scientist clearly establishes there will be no adverse environmental impact and will not interfere with the satisfactory operation and maintenance of the system. Table 2 shows the acceptable minimum separation distances from the various components of treatment systems.
(5) Once the required infiltration area is determined by daily flow, percolation tests and soil evaluation, the required useable area of the property for subsurface treatment can be found. An additional useable area of 50 percent shall be set aside for future expansion or replacement whenever possible.
(b) Separation Requirements for septic system components from buildings and other site features:
TABLE 2 - SEPARATION DISTANCES FROM WASTEWATER SYSTEM COMPONENT
SEPARATION DISTANCES FROM WASTEWATER SYSTEM COMPONENTS TO STREAM, LAKE WELL OR WATERCOURSE (b) PROPERTY SYSTEM COMPONENTS SUCTION LINE OR WETLAND DWELLING LINE House sewer 25'if cast iron 25' 10' 10' (watertight joints) pipe 50'otherwise Septic tank 50' 50' 10' 10' Effluent line to distribution box 50' 50' 10' 10' Distribution box 100' 100' 20' 10' Absorption field 100' (b) 100' 20' 10' Seepage pit 150' (b) 100' 20' 10' Dry well (roof and footing) 50' 25' 20' 10' Raised or Mound system 100' 100' 20' 10' Evapotranspiration- absorption system 100' 50' 20' 10' Composter 50' 50' 20' 10'
NOTES to the table on Septic Separation Distances
See SEPTIC CLEARANCE DISTANCES for a more extensive table of recommended clearances and distances between septic system or well components and other site features
© Soil Investigation for Septic System Design & Installation Approval
(d) Soil Percolation Test Detailed Specifications
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