Transcript Slide 1

Rocky Mountain Water:
Reuse it or Lose it!
2006 Water Reuse Workshop
Colorado School of Mines
Golden, Colorado
August 10, 2006
Update on the Colorado Water Reuse
Regulations
Wesley Carr, CDPHE
Background
o February 1998 – The Joint Reuse Committee RMSAWWA/RMWEA suggested an approach to the
Water Quality Control Commission (WQCC) for
reuse of reclaimed domestic wastewater
o 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
Background
o 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
Background
o 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
o July 1st, 2000 – Changes became effective
o Reuse subcommittee concurrently developed a
control regulation modeled after the biosolids
regulation
Reclaimed Water Control
Regulation No 84
o WQCC adopted the Reclaimed Domestic
Wastewater Control Regulation in October 2000
(recently renamed - Reclaimed Water Control…)
o Initially, the scope was limited to the use of
reclaimed water for landscape irrigation –
excluding single-family residential areas
o Recent amendments added commercial, industrial
and fire protection uses as well as residentcontrolled (single-family) landscape irrigation.
Purpose
o Encourage the use of reclaimed water while
protecting public health and environment
o 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
o A “Notice of Authorization” is the implementing
platform
o Treaters submit a Letter of Intent and for each user, a
User Plan to Comply
Reuse
Water Quality Standards
o Mitigate public health risk by treating the water for
pathogens: viruses, bacteria & protozoan
o Minimize the risk for gastrointestinal disorders for
people casually exposed to reuse water used for
surface irrigation of landscaping (and recently
approved uses)
Reuse
Water Quality Standards
o Bacteria protection is achieved through imposing
limits on E. coli – surrogate for bacteria pathogens
o Viral & protozoan protection is achieved through
imposing limits on turbidity and TSS as appropriate
Reuse
Water Quality Standards
o Reclaimed water standards for uses requiring
water
(formerly “Restricted Use” water used in areas having a low
potential for public contact) at a minimum shall receive:
o Secondary treatment and disinfection
o E. coli
126/100ml monthly geometric mean
235/100ml single sample maximum
o TSS
30 mg/L as a daily maximum
Reuse
Water Quality Standards
o Reclaimed water standards for uses requiring
water
(formerly “Unrestricted Use” water used in areas with high
potential for public contact) at a minimum shall receive:
o Secondary treatment, FILTRATION & disinfection
o E. coli
126/100ml monthly geometric mean
235/100ml single sample maximum
o Turbidity < 3 NTU daily average
< 5 NTU no more than 5% individual samples
Reuse
Water Quality Standards
o Reclaimed water standards for uses requiring
water
(recently created for resident-controlled landscape irrigation
and residential fire protection - higher potential for public
contact and cross connections) at a minimum shall receive:
o Secondary treatment, filtration & disinfection
o E. coli
N.D. in at least 75% of monthly samples
126/100ml single sample maximum
o Turbidity < 3 NTU daily average
< 5 NTU no more than 5% individual samples
Reclaimed Water
Approved Uses
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Industrial Uses
o
o
o
o
o
o
Restricted Access
Unrestricted Access
Resident-Controlled
Commercial Uses
o
o
o
Cooling towers
Concrete Mixing and Washout
Dust Control
Soil Compaction
Closed Loop Cooling Systems
Landscape Irrigation
o
o
o
o
123
123
X
123
X
1X
23
123
Mechanized Street Cleaning
Zoo Operations
Fire Protection
o
o
Nonresidential Fire Protection
Residential Fire Protection
X
123
X
1X
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Treaters’ Letter of Intent
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Treater Information – address, contact, phone, location. Etc.
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Info demonstrating the treaters’ ability to comply with the standards
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o
o
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Agronomic analysis
o
o
o
treatment schematic
proposed POC
Site application approval letter or evidence of a SA submittal
Nutrients e.g. N,P as applicable
Consumptive needs, BMPs, etc.
Reuse System Management Plan
o
o
o
o
Treatment & transmission systems
E/O
Oversight of users
Ability to terminate service
o
Certification Statements
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User Plan to Comply for each user
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Affirmation that use won’t materially injure water rights
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Where water is distributed for fire-protection: a map of where water will be distributed
including a list of the associated fire protection districts and a letter of approval from
each
User Plan to Comply All Users
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Use confined to authorized use area, operation or process
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Reclaimed water will not be used or sprayed
o
o
o
o
Occupied buildings
Domestic drinking water facilities
Food is being prepared for human consumption
Public Notification
o
o
Signage
E/O
o
Piping, valves, outlets, etc. differentiated from potable or other piping systems
o
Backflow prevention/cross-connection control methods
o
System operated/maintained by authorized personnel
o
Supplementing w/potable or other sources not allowed except through approved BF
prevention device or air gap
o
No impoundment within 100’ of domestic supply
o
o
Unless lined
Other precautions approved by Division
o
Worker education
o
Other conditions as applicable
UPC Landscape Irrigation
o
User contact information/location
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Map/schematic showing use areas
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Description of BMPs
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o
o
o
o
Where Category 1 water is required
o
o
o
Minimize ponding/runoff
ET rates
Rain shutoff
Inspections
Irrigation times
Barriers
Resident-controlled landscape irrigation
o
o
Treater responsible for all UPC information and shall act as the users’ legal
representative for purposes of certification
Unless an HOA assumes responsibility
UPC – Commercial, Industrial &
Fire Protection
o
User information/location, etc
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Description of how water will be used
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Maps/Schematics
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Description of the potential for public contact associated with process or use
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Fate of water after it has been used e.g. discharged to sewer, stored, etc.
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BMPs to prevent contact, windblown, etc.
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Access restrictions or prevent contact with Category 1 water if applicable
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For fire protection
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Cross-connection control program information and BMPs
Additional Conditions
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Cooling Towers
Concrete Mixing & Washout
Dust Control, Soil Compaction & Mechanized Street Cleaning
Unrestricted Access/Resident Controlled Landscape Irrigation
Resident Controlled Landscape Irrigation
Current/Future
Regulatory Considerations
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o
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Update LOI/UPC/NOA Templates
Agronomic Rate Policy
Monitoring Policy
Additional Uses
WWTF Process Water
Exemptions/Clarifications
Contact Information
Wesley Carr, Environmental Protection Specialist
Reuse Management Program
WQCD-P-B2
4300 Cherry Creek Dr. South
Denver, CO 80246-1530
303-692-3613
[email protected]