complex septic system installer training class
TRANSCRIPT
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Public Health – Idaho North Central District
January 17, 2020 Lewiston
January 24, 2020 Moscow
January 31, 2019 Orofino
February 21, 2020 Lewiston
March 3, 2020 Grangeville
www.idahopublichealth.com
Complex Septic System
Installer Training Class
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Updates to the Technical
Guidance Manual
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Complex Systems and
Licensing
Any system currently listed in the TGM.
Public works contractors may install any central or
municipal system while under the supervision of PE
licensed in Idaho.
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Complex Systems
Not Requiring an Engineer
ETPS
Pump-to-gravity pressure distribution
Two-cell infiltrative system
Remediation components
Proprietary waste water treatment systems*
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Complex Systems
Requiring an Engineer
At-grade soil absorption system
Drip distribution system
Evapotranspiration and evapotranspiration/infiltrative system
Experimental systems
Pressurized grey water systems
Pressurized in-trench sand filter
Individual lagoon
Intermittent sand filter
Large soil absorption systems
Pressure distribution systems
Public systems*
Recirculating gravel filter
Sand mound
Subsurface flow constructed wetland
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Operation & Maintenance
O&M of complex sewage disposal systems not designed
by an engineer is generally found in the TGM or in the
design manual provided by the product manufacture.
All systems designed by an engineer must submit an
operations and maintenance manual with the application.
Some systems require OMM be performed by a service
provider, with annual reporting.
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Certified Service Providers
OMM required by certified service provider for:
ETPS
Recirculating gravel filters
Manufacturer-specific training documentation
$15,000 bond
Exam ≥70%
Annual reports
Refresher Training
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Idaho Department of Environmental Quality
Service Provider Responsibilities
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Pumping Sewage
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Dosing Chambers
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Dosing Chambers
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More on Pumping
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Pump-to-Gravity Distribution
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Two-Cell Infiltrative System
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Two-Cell Infiltrative System
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Pressurized
In-trench Sand Filter
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Enveloped In-trench Sand Filter
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Pressurized Enveloped
In-trench Sand Filter
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Pretreated Enveloped
In-trench Sand Filter
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Extended Treatment
Package Systems
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Common ETPS in Idaho (1,935 installed as of 2017)
23
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ETPS Examples
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ETPS Examples
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Remediation Components
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Engineered Systems
Questions so far?
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A Note on Engineers
The engineer must be licensed as a P.E. in Idaho.
Familiar with waste water.
The engineer is responsible for submitting an as-built and
O&M at the completion of the project.
Availability of engineers.
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Pressure Distribution System
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Pressure Distribution System
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Sand Mound Systems Pressurized distribution is required
Setback reductions
Maximum slopes of 20% for A and B soils 12% for C-1 and 6% for C-2
Sludge in septic tank should be checked annually and pumped at 40%
TGM Section 4.24
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Sand Mound Systems Cells should be as long and narrow as possible
Vegetation must be removed and the entire area
scarified then plowed 6 to 8 inches deep before sand is
placed.
TGM Section 4.24
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Pressurized Grey
Water Systems Grey water plumbing systems must be approved by the
Idaho Division of Building Safety
The number of occupants is used to determine daily flow
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Individual Lagoon 200’ setback to property line
Site slope may not exceed 12%
Not to be placed in areas that freeze for more than 3 months Or where precipitation is greater than evaporation
10 acre minimum lot size, variance required from 5 acre to 10
Lagoon area must be compacted
Area must be fenced
TGM Section 4.16
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Individual Lagoon
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Individual Lagoon
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Individual Lagoon
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Evapotranspiration &
ET/Infiltrative Systems
TGM Section 4.6
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Evapotranspiration
ET/Infiltrative Systems
Seasonal ground water must not come within 6” of liner
100’ setback to wells and surface water
Site must not be subject to flooding
High water alarm and standpipes are required
Distribution laterals must be wrapped with geotextile
fabric
The ETI system are similar to ET just put in C type soils
with no liner, or a clay based liner.
TGM Section 4.6
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Recirculating Gravel Filter
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Recirculating Gravel Filter
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Recirculating Gravel Filter
Gravity flow splitter
Pressurized splitter valve
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Recirculating Gravel Filter
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Intermittent Sand Filter
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Drip Distribution System
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Drip Distribution System
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Drip Distribution System
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Large Soil
Absorption System
2,500 -10,000 GPD.
Two complete systems constructed with reserve area.
Design engineer will create and O&M manual.
Monitoring is required, with an annual report to be filed
by January 31 each year
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LSAS
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LSAS
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LSAS
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At-Grade Soil
Absorption System
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Subsurface Flow
Constructed Wetlands
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Subsurface Flow
Constructed Wetlands
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Experimental Systems
Site must be suitable for a standard or alternative system
A variance is required
Operations and Maintenance Manual must be provided
with the application. This manual must be approved
before a permit will be issued.
Approval is at the discretion of DEQ
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Experimental Systems
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Proprietary Wastewater
Treatment Systems
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Proprietary Wastewater
Treatment Systems
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Proprietary Wastewater
Treatment Systems
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Proprietary Wastewater
Treatment Systems
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Questions?