Performance-Based (P-B) Regulation for Onsite/Decentralized Wastewater Treatment Systems A Vision for this Century - PowerPoint PPT Presentation

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Performance-Based (P-B) Regulation for Onsite/Decentralized Wastewater Treatment Systems A Vision for this Century

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Performance-Based (P-B) Regulation for Onsite/Decentralized Wastewater Treatment Systems A Vision for this Century. by Edwin K Swanson, PE * A Vision for a P-B Code ... – PowerPoint PPT presentation

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Title: Performance-Based (P-B) Regulation for Onsite/Decentralized Wastewater Treatment Systems A Vision for this Century


1
Performance-Based (P-B) Regulation for
Onsite/Decentralized Wastewater Treatment
Systems A Vision for this Century
  • .
  • byEdwin K Swanson, PE

2
A Vision for a P-B Code Framework
Wastewater Characteristics Model
Onsite Wastewater Facility Function
Environmental Receptor Models
Soil Absorption Model
Wastewater Dispersal Risk Models
Aquifer Protection
Waterbody/ WatershedProtection
3
Onsite Program Challenges
  • Affects suburban rural property owners
  • Out-of-sight out-of-mind owner attitude
  • Local programs often
  • are under funded
  • have limited private public expertise
  • Industry is often a cottage industry with
  • local regulation suppliers
  • resistance to change
  • Marketing considerations often drive decisions

4
Onsite Program Challenges(contd)
  • Prescriptive regulatory bias and lost linkages
    with the underlying science make it easier
    . - to say no
    . - than
    to figure out an appropriate yes
  • Prescriptive regulation may be misused to
    constrain development rather than by zoning.

5
Minimum Elements of AnyOnsite Rule
  • Site evaluation (EPA 3)
  • System selection and design (EPA 4)
  • System installation (EPA 5)
  • System operation maintenance (EPA 6)
  • (EPA is the Program Element Category in the
    Draft Voluntary Management Guidelines)

6
Properties of the P-B Vision
  • Provides for making decisions to apply onsite
    system technologies and practices that are
    supported by science, public acceptance law
  • Raw wastewater is characterized for flow,
    constituents and strength to determine raw
    wastewater loading rates at facility inlet
  • System selection considers documented site
    conditions to determine limitations, if any, that
    require superior treatment dispersal
    performance compared to a conventional septic
    system

7
Properties of the Vision (contd)
  • Site evaluation, soil properties, pollutant type
    soil loading rate are considered when a soil
    treatment credit is approved in a zone of
    unsaturated flow beneath the dispersal works
  • Dispersal works design determined by soil
    properties, site evaluation and treated
    wastewater characteristics using algorithms for
    soil properties pollutant loading rate

8
Properties of the Vision (contd)
  • Minimum performance for treatment dispersal
    technologies is specified in terms of loading
    rate statistical measures of pollutant
    reductions
  • Provides a scientific framework for making design
    adjustments based on raw wastewater, treatment
    performance site conditions

9
P-B Code Elements
  • Site investigation, system selection, design
    operation are integrated in a framework that
    ensures discharge performance
  • Discourages gold plating by requiring system
    selection to overcome site/soil limitations
  • Performance for treatment systems allow for
    evolving technologies
  • Technologies are consistently rated based on
    code-specific terms, documented performance
    algorithms for integrating system design

10
P-B Code Elements (contd)
  • Operation based on a discharge permit, not a
    construction approval. Compliance is determined
    by conformance with the terms conditions in a
    general permit rule
  • Compliance evaluation based on field
    observations, status of required operational
    records, and absence of unauthorized conditions
  • Owner is responsible for all servicing and
    availability of records

11
P-B Code Elements (contd)
  • Regulatory system inspection limited to
  • Complaint response and
  • Courtesy assistance
  • Mandatory comprehensive inspection when property
    changes ownership
  • Community-wide statistical verification study to
  • Evaluate system discharge performance and
  • Confirm code efficacy

12
Visionary P-B Code Framework
Wastewater Characteristics Model
Onsite Wastewater Facility Function
Environmental Receptor Models
Soil Absorption Model
Wastewater Dispersal Risk Models
Aquifer Protection
Waterbody/ WatershedProtection
13
Wastewater Characteristics Model
Onsite Wastewater Facility Function
Environmental Receptor Models
Wastewater Dispersal Risk Models
Soil Absorption Model
Aquifer Protection
Waterbody/ WatershedProtection
14

Wastewater Characteristics Model
PARAMETERS BASED ON flow rate/variability, waste
loads,facility performance measurements, and
environmental receptor models
15
Wastewater Characteristics Model
Onsite Wastewater Facility Function
Receiving Environment Models
Soil Absorption Model
Wastewater Dispersal Risk Models
Aquifer Protection
Waterbody/ WatershedProtection
16
Onsite Wastewater Facility Function
Hydraulic Performance
Unit Process Treatment Performance
17

Onsite Wastewater Facility Function
PARAMETERS BASED ON flow rate/variability, waste
loads, treatment process measurements (BOD, TSS,
alkalinity, etc.), and environmental receptor
models
18
Wastewater Characteristics Model
Onsite Wastewater Facility Function
Environmental Receptor Models
Soil Absorption Model
Wastewater Dispersal Risk Models
Aquifer Protection
Waterbody/ WatershedProtection
19
Environmental Receptor Models
Soil Absorption Model
Wastewater Dispersal Risk Models
Aquifer Protection
Waterbody/ WatershedProtection
A
B
C
20
Soil Absorption ModelA
  • Parameters based on
  • Soil classification relationships
  • Percolation test relationships
  • BOD, TSS, FOG
  • Absorption surface
  • Operational life
  • Site hydraulic capacity

21
Aquifer ProtectionB
  • Parameters based on
  • Appropriate indicator organisms
  • Pathogens
  • Acceptable soil horizons
  • Waste loading analyses
  • Aquifer water quality
  • Aquifer standards
  • Pollutant fate and transport processes

22
Waterbody/Watershed Protection C
  • Parameters based on
  • Water quality standards
  • Waste loading analyses
  • Waterbody quality
  • Seasonal conditions
  • Pollutant fate and transport processes

23
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