InspectAPedia TM
Building & Environmental Inspection, Testing, Diagnosis, Repair, & Problem Prevention Advice Home
Conditioning
Inspection
Ventilate
Inspect/Test
Water
Septic
Directory of Professionals to Inspect or Test a Building
InspectAPedia TM Building & Environmental Inspection, Testing, Diagnosis, Repair, & Problem Prevention Advice |
||||||||||||||||||||||||||
| InspectAPedia Home |
| | Air Conditioning |
| | Electrical | | | Environment | | | Exteriors | | | Heating | | | Home Inspection |
| | Insulate Ventilate |
| | Interiors | | | Mold Inspect/Test |
| | Plumbing Water Septic |
| | Roofing | | | Structure | | | Contact Us |
| Directory of Professionals to Inspect or Test a Building |
||||||||||||||||||||||||||
|
SEPTIC SYSTEMS HOME
SEPTIC INFO ARTICLES HOME BUYERSGUIDE SEPTIC SYSTEMS ONLINE BOOK SEPTIC PUMPING REPAIR SEPTIC TREATMENTS SEPTIC CONSULTANTS SEPTIC AUTHORITIES BOOKS REFS CODES SEPTIC SYSTEM DESIGN BASICS DESIGN ALTERNATIVES 75-A.0 New York State Regulation of Private Septic Systems 75-A.1 Introduction to Septic Systems, Definitions of Septic System Terms 75-A.2 Regulation of Sewage Treatment Systems by other agencies 75-A.3 Sewage flows and design flow estimates 75-A.4 Soil and site appraisal for Septic Systems 75-A.5 House or building sewer line specifications 75-A.6 Septic tank capacity requirements, installation, and placement 75-A.7 Distribution lines, distribution boxes, gravity flow, pressure distribution, dosing, siphons 75-A.8 Subsurface treatment of effluent, absorption field requirements, leach field design criteria 75-A.9 Alternative Septic System Designs Raised Bed Septics Septic Mounds Sand Septic Filters Evaporation Septics 75-A.10 Other systems 75-A.11 New product/system design interim approval List Your Service/Product More Information InspectAPedia TM Home & Site Map Plumbing Water Septic Accuracy & Bias Pledge Contact Us |
Our site offers impartial, unbiased advice without conflicts of interest.
We will block advertisements which we discover or readers inform us are associated with bad business practices,
false-advertising, or junk science. Our contact info is at
inspect-ny.com/appointment.htm.
Section 75-A.9 Alternative Septic Systems: (b) Raised Septic Systems Design CriteriaTitle: Appendix 75-A.9 - Alternative Septic Systems
[Regulation and System Design Criteria for Raised Septic Systems,
Septic Mound Systems, Intermittent Sand Filter Bed Systems,
Evaporation-Transpiration Septic Systems,
Evaporation-Transpiration Absorption Septic Systems, and
Other Alternative Septic Systems]
(1) General: Raised Septic SystemsA raised septic system [or raised bed septic system] is an absorption trench system constructed in fill material with acceptable permeability placed above the natural soil on a building lot. [DF: Note: while they are similar in design "raised septic systems" discussed here are not identical to "mound septic systems" discussed at Septic Mounds which have different site requirements] (2) Site Requirements for Raised Septic SystemsA raised system may be used where all the following conditions are found: (i) There is at least one foot of original soil with a faster than 60 minutes percolation rate, above any impermeable soil layer or bedrock, but not more than two feet. (ii) The maximum high groundwater level must be at least one foot below the original ground surface. (iii) Slopes shall not exceed 15%. (iv) All minimum vertical and horizontal separation distances can be maintained as described in Table 2. (3) Design Criteria for Raised Bed Septic Systems(i) Percolation tests shall be conducted in the fill material at the borrow pit and after placement and settling at the construction site. The slower percolation rate of these tests shall be used for design purposes. (ii) The total area beneath the absorption trenches, extending 2.5 feet in all directions from the outer edge of all trenches, is defined as the basal area. The minimum size of the basal area of the raised bed shall be calculated based upon 0.2 gpd/sq.ft. (iii) An absorption trench system as described in Section 75-A.8(b) is designed using the percolation rate of the fill material. The use of slowly permeable soils for the fill material will result in a trench system that will have a basal area larger than the minimum area calculated in (ii) above. (iv) Sufficient soil with a percolation rate of between 5 - 30 min/in is required to maintain at least two feet separation between the proposed bottom of the trenches and any boundary condition such as groundwater, bedrock, clay or other relatively impermeable soil or formation. (v) The edge of the fill material shall be tapered at a slope of no greater than one vertical to three horizontal with a minimum 20 foot taper. (vi) Horizontal separation distances shall be measured from the outside edge of the taper. (vii) The system shall incorporate siphon dosing or pressure distribution except where the following conditions are met: (aa) The local health department has a program incorporating site evaluation, system design approval, and construction inspection/certification. (bb) A minimum of two feet of fill material with a percolation rate of 5 - 30 min/in shall be placed between the bottom of the trenches and the existing ground. (viii) Curtain drains may be used to intercept and carry underground water away where high groundwater levels exist. Curtain drains shall be upslope from the system and at least 20 feet from the toe of slope of the fill material. (4) Construction details for raised bed septic systems(i) Heavy construction equipment shall not be allowed within the area of the system. The underlying soil shall be undisturbed although the surface may be plowed with at least a double bottomed blade/furrow plow and the furrow turned upslope. (ii) A system shall not be built in unstablized fill material. The fill material shall be allowed to settle naturally for a period of at least six months to include one freeze-thaw cycle. (iii) The absorption trenches shall be constructed in the fill material. (iv) The entire surface of the system including the tapers shall be covered with a minimum of six inches of topsoil, mounded to enhance the runoff of rainwater from the system and seeded to grass. (v) On sloping sites a diversion ditch or curtain drain shall be installed uphill to prevent surface water runoff from reaching the bed area. More expert information on this topic |
|
SEPTIC SYSTEMS HOME SEPTIC INFO ARTICLES HOME BUYERSGUIDE SEPTIC SYSTEMS ONLINE BOOK SEPTIC PUMPING REPAIR SEPTIC TREATMENTS SEPTIC CONSULTANTS SEPTIC AUTHORITIES BOOKS REFS CODES SEPTIC SYSTEM DESIGN BASICS DESIGN ALTERNATIVES List Your Service/Product More Information InspectAPedia TM Home & Site Map Air Conditioning InspectAPedia Bookstore Electrical Environment Exteriors Heating Home Inspection Insulate Ventilate Interiors Mold Inspect/Test Roofing Plumbing Water Septic Structure Accuracy & Bias Pledge Contact Us |
More Information on Septic System Diagnosis, Maintenance, & Repair
|
03/23/2008 - 1/1/1995 www.inspect-ny.com/septic/NYS75-A.9b.htm © Copyright 2008-1995 Daniel Friedman - all rights reserved
InspectAPedia TM Home & Site Map
Home Inspection Construction Consulting Services
Contact Daniel Friedman