Expanding Domestic Wastewater Reuse in Colorado Regulation No. 84 - PowerPoint PPT Presentation

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Expanding Domestic Wastewater Reuse in Colorado Regulation No. 84

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Title: Expanding Domestic Wastewater Reuse in Colorado Regulation No. 84


1
Expanding Domestic Wastewater Reuse in
ColoradoRegulation No. 84
  • 2004 Joint RMSAWWA/RMWEA Annual Conference
  • September 12-15, 2004
  • Wesley Carr, Environmental Protection Specialist
  • CDPHE/WQCD

2
Background
  • February 1998 The Joint Reuse Committee -
    RMSAWWA/RMWEA suggested an approach to the Water
    Quality Control Commission (WQCC) for reuse of
    reclaimed domestic wastewater
  • March 1998 The WQCC requested a Water Quality
    Forum Subcommittee be convened to consider
    potential statutory changes to the Water Quality
    Control Act to address use of reclaimed domestic
    wastewater for landscape irrigation

3
Background
  • Fall 1999 the Forum subcommittee recommended
    the Water Quality Control Act be amended to
    provide the Commission authority to promulgate
    regulations for the oversight of reuse and
    provide the WQCD authority to implement a reuse
    program

4
Background
  • March 2000 General Assembly adopted changes to
    the Act providing the WQCC authority to establish
    regulations for reuse - except for uses related
    to drinking water
  • July 1st, 2000 Changes effective
  • Reuse subcommittee concurrently developed a
    control regulation modeled after the biosolids
    regulation

5
Reclaimed Domestic Wastewater Control Regulation
No 84
  • WQCC adopted the Reclaimed Domestic Waster
    Control Regulation in October 2000
  • Allowed for the use of reclaimed domestic
    wastewater for landscape irrigation

6
Purpose
  • Encourage the use of reclaimed water while
    protecting public health and environment
  • Make reuse permitting less cumbersome by
    eliminating previously required discharge permits
    - based on adequate demonstration of application
    at or below agronomic rates with respect to
    nutrients
  • Notice of Authorization is the implementing
    platform

7
Reuse Program Development
  • After the regulation was adopted, the Reuse
    Committee assisted the Division with development
    of the reuse program
  • Letter of Intent forms and templates
  • Notice of Authorization templates
  • Committee developed public outreach pamphlets
  • A CWQF Workgroup consisting of the Committee, the
    Division and others recently revisited the
    regulation and incorporated additional uses

8
Landscape Applications
  • Applications Permitted So far
  • - Sod farms - Schools
  • - Golf courses - Ball fields
  • - Parks - Medians
  • - Greenbelts - Cemeteries
  • - Open space - Multi-family units
  • - HOAs - Business complexes

9
Single-Family Residential
  • Single-Family residential use is not permitted
    under the current regulation
  • A CWQF workgroup is however working on a proposal
    to incorporate this use

10
Development of Reuse Water Quality Standards
  • Mitigate public health risk by treating water for
    pathogens viruses, bacteria protozoan
  • Minimize the risk for gastrointestinal disorders
    for people casually exposed to reuse water used
    for surface irrigation of landscaping

11
Development of Reuse Water Quality Standards
  • Bacteria protection is achieved through imposing
    limits on E. Coli surrogate for bacteria
    pathogens
  • Viral protozoan protection is achieved through
    imposing limits on turbidity

12
Development of Reuse Water Quality Standards
  • Reuse water meeting Category 2 Unrestricted Use
    standards and used in areas with high potential
    for public contact requires filtration and
    turbidity limits as an additional barrier

13
Development of Reuse Water Quality Standards
  • Reuse water meeting Category 1 Restricted Use
    standards and used in areas having a low
    potential for public contact does not require
    filtration but must meet TSS limits consistent
    with a well-operated secondary treatment system

14
Reuse Water Quality Standards
  • Treatment to Category 2 Unrestricted Use
    standards requires oxidation, filtration and
    disinfection
  • E. Coli 126/100ml monthly geometric mean
  • 235/100ml single sample maximum
  • Turbidity Not to exceed 3 NTU as a monthly
    average
  • Not to exceed 5 NTU in more than 5 of
    samples

15
Reuse Water Quality Standards
  • Treatment to Category 1 Restricted
    Usestandards requires secondary treatment and
    disinfection
  • E. Coli 126/100ml monthly geometric mean
  • 235/100ml single sample maximum
  • TSS 30 mg/L as a daily maximum

16
Basis for Standards
  • Research evidence shows E. Coli is the most
    appropriate surrogate indicator organism for
    pathogens does not re-grow when released into
    the ambient environment
  • Swim beach standard for E. Coli was chosen
    because criteria developed to protect swimmers
    will be more protective of people casually
    exposed to reclaimed water the swim beach
    standard was developed based on ingestion of 100
    ml of water


17
Basis for Standards
  • Category 2 - turbidity is a relatively simple
    measurement of microbial purity. Research
    demonstrates an absence of virus PFUs at up to 6
    NTU when combined with disinfection. The
    commission adopted a 3 NTU standard.
  • Category 1 30 mg/l total suspended solids was
    chosen because it is a standard consistent with a
    well operated facility. The standard is
    acceptable for application of reuse water to
    sites with a low-potential for public contact.


18
Conditions for Use Of Reuse Water
  • Confine application to authorized areas
  • -minimize runoff
  • -confine direct and windblown spray
  • -keep spray away from food and drinking water
  • Application rates shall control ponding (surface
    water and ground water protection)
  • Public notification and signage shall be provided

19
Conditions for Use Of Reuse Water
  • Pipes, valves, outlets, controllers, tank trucks
    shall be marked
  • Back flow prevention devices shall be used at
    potable connections
  • No impoundment or irrigation within 100 of a
    domestic water supply
  • Workers shall be notified of potential health
    hazards

20
Additional Conditions for Water Meeting Category
1 Standards
  • Irrigate during periods when public is not
    present or
  • Use barriers to prevent access to the site
  • -barriers may not be removed until
  • 1-hour after watering ceases

21
Facilities Currently Authorized for Reuse Under
Regulation 84
Facility Capacity MGD Anticipated MGD
City of Aurora Sand Creek Reuse 5 5
Centennial Water and Sanitation 3 1
City of Westminster 6 6
Plum Creek Wastewater Authority 3.55 1.2
City of Louisville 0.145 0.145
Upper Monument Creek 0.5 0.5
Colorado Springs - LVSWWTF 6 6
Fairways Metro District 0.107 0.103
Town of Superior 2.2 1.2
Stonegate Village Metro District 1.1 1.1
Denver Water 30 5
Broomfield Wastewater Reclamation 6 6
Parker Water and Sanitation District 3.5 1.44
Total 67.1 34.7
22
Recent Changes June 30, 2004
  • Minor editorial changes
  • Reorganization of several sections
  • Standards categorized to help clear up confusion
    unrestricted vs. restricted use
  • Additional uses have been incorporated
  • New definitions for new use clarification
  • New User Plan to Comply requirements to
    compliment these new uses

23
Additional Uses Approved
  • Industrial
  • - cooling towers
  • - concrete mixing and washout
  • - dust control
  • - soil compaction
  • - closed loop cooling systems
  • Commercial
  • - mechanized street cleaning
  • - zoo operations
  • - non-residential structure fire protection

24
Basis for Uses
  • When proper BMPs are employed for these
    additional uses, the public health and
    environment are protected.

25
Cooling Towers/ Closed Loop Cooling
  • No discharge sanitary sewer
  • Discharge under another permit
  • Low potential for public contact
  • Water is treated higher standards

26
Concrete Mixing
  • No discharge
  • Cat. 1 Mixing only
  • Cat. 2 Mixing and wash down
  • High pH
  • Driver training/signage for truck supply

27
Dust Control/Soil Compaction
  • Controlled application rates
  • Low potential public contact
  • Higher potential sites require Category 2 water
    and BMPs

28
Mechanized Street Sweepers
  • Controlled application rates
  • Low potential for public contact
  • No significant residue on surface

29
Fire Protection
  • Discharges exempt from NPDES discharge permitting
    requirements
  • Fire authority approval letter
  • Public contact potential low infrequent/short
    duration
  • Fire fighter training/ additional BMPs

30
Zoo Operations
  • No discharge sanitary sewer
  • No public contact with reuse water
  • Holding ponds/tanks lined
  • Category 2 water exceeds federal water standards
    for zoo operation
  • Worker training and BMPs

31
Reuse Permitting - Treater
  • Letter of Intent
  • Facility information, contacts, Etc.
  • Information demonstrating ability to comply with
    reuse water quality standards
  • Information on nutrient content and an agronomic
    analysis
  • Reuse system management plan addressing
    public/worker education, ability to terminate
    service, etc.
  • Evidence that reusing the water will not
    materially injure water rights
  • A User Plan to Comply for each user
  • For fire protection - a letter form the FPA
  • Notice of Authorization Use and Distribution

32
Reuse Permitting - User
  • User Plan to Comply Submit to Treater
  • UPC Demonstrates how user will meet the
    conditions for use of reuse water templates
    available
  • Conditions outlined for ALL users
  • Additional conditions required based on type of
    use
  • Notice of Authorization Use Reuse Water
  • Each individual user

33
Annual Report - Treater
  • Demonstration standards were met
  • Information submitted to Treater by User
    demonstrating the conditions of application were
    met
  • Evidence that the Treater conducted inspections
    of users

34
Current CWQF Workgroup
  • Single-family residential reuse
  • Nexus between Regulations 84, 72 and 61
  • Additional uses equally/greater protective than
    SF
  • Further Information Available _at_
  • www.cwqf.org
  • www.cdphe.state.co.us
  • www.rmwea.org

35
Discussion
CONTACTS
Wesley Carr Reuse Management Program WQCD-P-B2 430
0 Cherry Creek Dr. South Denver, CO
80246-1530 303-692-3613 wes.carr_at_state.co.us
John Rehring, P.E., CDM RMSAWWA/RMWEA Joint Reuse
Committee Chair 1331 17th Street Ste.
1200 Denver, CO 80202 303-298-1311 rehringjp_at_cdm.c
om
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