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SEPTIC SYSTEMS HOME SEPTIC SYSTEMS ONLINE BOOK SEPTIC SYSTEM DESIGN BASICS Septic Soil PERC TESTS WHAT ARE PERC TESTS PERC HOLE SPECIFICATIONS PERC STANDARDS SEPTIC TANK SIZE SEPTIC TANK DEPTH SEPTIC TANK TEES SEPTIC DRAINFIELD SIZE SEPTIC DRAINFIELD SHAPE SEPTIC CLEARANCES SEPTIC TANK PUMPING FREQUENCY SEPTIC TANK PUMPING PROCEDURE SEPTIC PUMPING REPAIR SEPTIC TREATMENTS SEPTIC DESIGN ALTERNATIVES InspectAPedia ® BOOKSTORE More Information InspectAPedia® Home & Site Map Air Conditioning & Heat Pumps Bookstore Electrical Environment Exteriors Heating Home Inspection Insulate Ventilate Interiors Mold Inspect/Test Plumbing Water Septic Roofing Structure Accuracy & Privacy Policies Contact Us |
This chapter discusses soil percolation rate specifications - what are the required soil perc rates when testing for septic system absorption system or drainfield design or repair. Citation of this article by reference to this website and brief quotation for the sole purpose of review are permitted. Use of this information at other websites, in books or pamphlets for sale is reserved to the author. Technical review by industry experts has been performed and is ongoing - reviewers welcomed and are listed at "References." This document is a chapter of Inspecting, Testing, & Maintaining Residential Septic Systems an online book on septic systems. © Copyright 2009 Daniel Friedman, All Rights Reserved. Information Accuracy & Bias Pledge is at below-left. Use links at the left of each page to navigate this document or to view other topics at this website. Green links show where you are in our document or website. PERC TEST STANDARDS - What are the soil percolation rate standards and other soil requirements for septic systems?The Massachusetts Title 5 Septic Inspection criteria does a great job of defining a (at least possibly) what is required to assure a functional septic drainfield. The text explains the role of the biomass below the absorption bed, sets soil depth requirements, and recognizes the importance of keeping the bottom of the working biomass area in well drained soil sufficiently above the seasonal high water table. Here is an example of soil requirements for a functional drainfield. This version is particularly clearly written and is for residents of Ohio but the principles apply anywhere. Readers should also see our example of state-regulated soil percolation tests at the New York State Septic System Design Regulations 75-A.4 - Soil and site evaluation for septic system design page. In Ohio, soil absorption systems can be used in areas where the percolation rate of the soil is between 3 and 60 minutes per inch (soil permeability between 1 and 20 inches per hour). At least 4 feet of suitable soil is required under the soil absorption system to provide adequate treatment of the septic tank effluent. To accommodate the construction of the system and provide adequate soil cover to grade, a minimum of 5 1/2 to 6 1/2 feet of suitable soil is needed above the limiting layer. A limiting layer may be bedrock, an impervious soil layer (hardpan, fragipan) or a seasonally high water table (gray soil or mottles). The soil absorption system must be at least 8 feet from any drain line on the lot, 50 feet from a water supply, and 10 feet from the property line, right-of-ways and the house. Septic systems cannot be placed on the flood plain and are limited to areas with less than a 15 percent slope. Reference: ohioline.osu.edu/aex-fact/0743.html Ohio State University Fact Sheet Septic Tank - Soil Absorption Systems Our separate article by Lockwood includes a description of the calculations to answer the question: How Big Should the Leach Field Be? and includes a practical example using sample calculations as well as a table of soil percolation rate vs. the necessary leach field size. ... Technical Reviewers & References
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10/23/2009 - 01/21/1995 - InspectAPedia.com/septic/Soil_Perc_Test_3.htm - © 2009 - 1988 Copyright Daniel Friedman All Rights Reserved - InspectAPedia® is a Registered U.S. Trademark