Post on 19-Dec-2015
transcript
Operator ChallengesMeeting Both Drinking Water and Wastewater Needs
Vanessa Wike, P.E.Drinking Water ProgramStatewide Engineering Coordinator(907) 269-7696555 Cordova St.Anchorage, AK 99501vanessa.wike@alaska.gov
Department of Environmental ConservationSustained Compliance for Public Water Systems, Chapter 2Anchorage, AlaskaSeptember 29, 2011
James MacInnis, P.E.Wastewater ProgramStatewide Engineering Coordinator(907) 269-4874555 Cordova St.Anchorage, AK 99501James.macinnis@alaska.gov
Overview• Engineering Oversight
– Drinking Water– Wastewater
• Water WastewaterUnintended Impacts to Wastewater System
• Filter Discharges• System Discharges (Disinfection, Flushing, Leaks)
• Water WastewaterIncreased Risk of Contamination
• Water / Wastewater Separation Issues• Cross Connection Control• Drains
Drinking Water Engineering
Goals- Public Health
Activities- Plan Review- Inspections- Technical Assistance
“At any given time, half of the world’s hospital beds are occupied by patients suffering from diseases associated with lack of access to safe drinking water, inadequate sanitation and poor hygiene.” (2006 United Nations Human Development Report)
Bill Smyth, EIT 451-2177bill.smyth@alaska.gov
Oran Woolley 376-1852oran.woolley@alaska.gov
Bill Rieth, PE 269-7519bill.rieth@alaska.gov
Monica English 262-5210 x229monica.english@alaska.gov
Joran Freeman 465-5167joran.freeman@alaska.gov
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Vacant, PE (Lead) 269-3076
Chris Clark, EIT 269-7516chris.clark@alaska.gov
Dan Reichardt, EIT 269-7631daniel.reichardt@alaska.gov
Bill Tyrell, PE 269-6064william.tyrell@alaska.gov
Scott Forgue, PE (Lead) 262-3471scott.forgue@alaska.gov
Katrina Ladd, EIT 262-3400katrina.ladd@alaska.gov
David Khan, PE 465-5317david.khan@alaska.gov
Roy Robertson, PE (Lead) 376-1862roy.robertson@alaska.gov
Braden Galloway, PE 376-1846braden.galloway@alaska.gov
New Vacant, EIT 376- ####
Lee Johnson, PE (Lead) 451-2179lee.johnson@alaska.gov
Michael Jaynes, EIT 451-2165michael.jaynes@alaska.gov
Shawna Laderach, PE 451-5032shawna.laderach@alaska.gov
Johnny Mendez, PE 451-5193johnny.mendez@alaska.gov
JS
AM
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WASTEWATER ENGINEERS
Northern/Fairbanks Office610 University Ave Fairbanks, AK 99709
Mat-Su Office1700 E. Bogard Rd , Bldg B, Suite 103 Wasilla, AK 99654
Juneau Office (wastewater only)410 Willoughby Ave., Suite 303 Juneau, AK 99801
Kenai/Southeast Office43335 Kalifornsky Beach Rd., Ste 11 Soldotna, AK 99669
Southcentral/Anchorage Office555 Cordova Street Anchorage, AK 99501
MAILING ADDRESSES
Kena
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DRINKING WATER ENGINEERS
Wastewater Engineering
Goals- Public Health- Environment
Activities- Plan Review
- Permits- Technical Assistance
Drinking Water Wastewater
SourceTreatment & Storage Distribution
Treatment & Storage
Collection
Discharge“At any given time, half of the world’s hospital beds are occupied by patients suffering from diseases associated with lack of access to safe drinking water, inadequate sanitation and poor hygiene.” (2006 United Nations Human Development Report)
Filter Operations
Conventional, Direct, Green Sand
Membrane
Iron Oxide Media
Ion Exchange (water softeners)
System Discharges
operations, disinfection,
flushing, leaks
Drinking Water Wastewater
Filter Discharges
• “Filter to Waste” flows
• Typically less concentrated
contaminants, but possible
sediment, sludge
Conventional, Direct, Green Sand
• Big backwash flows periodically (15 gpm, for 15-20 minutes)
Filter Backwash Pond
Filter Discharges, cont.
Membrane
• Reject water flows constantly
• Chemically concentrated
Filter Discharges, cont.
Iron Oxide Media
• Big flows periodically, may
contain Arsenic
Ion Exchange (water softeners)• Periodic flows, usually minimal• Small amounts of
Calcium/Magnesium/Iron and possibly Arsenic
System DischargesOther issues :• Sludge (possibly, for systems adding a coagulant)
• Disinfection & Flushing
• Leaks
Discharges to Wastewater
Checklist
• WHERE is it going?
• HOW MUCH (volume) is being generated?
• WHAT is in the backwash water?
Discharge Requirements
• To Groundwater (drain field, percolation pond, etc.)
– Meet Drinking Water Standards– Plan Review
• To Surface Water (stream, lake, ocean, etc.)
– APDES Permit is required– Plan Review– Salmon Stream Restrictions
Discharge Limits
• Groundwater– Drinking Water Standards
• Surface Water– No Impairment of water body– Case-by-case basis (APDES)– Water Quality Standards, 18 AAC 70
Potential Cross Contamination
Separation Distances
Water Source
Public Water Line
Cross Connection Control
Backflow Prevention
Drains
Drinking Water Wastewater
Potential Cross Contamination
Separation Distances
Water Source vs. Wastewater
Public Water Lines vs. Wastewater
Cross Connection Control
Backflow Prevention
Drains
Required Separation Distances
Only 62% of the world’s population has access to improved sanitation – defined as a sanitation facility that ensures hygienic separation of human excreta from human contact. UNICEF/WHO. 2008.
Water System
Community Sewer Line , Wastewater Holding Tank & “Other”
Treatment & Disposal System (Septic Tank, Absorption Field) Community Sewer Cleanout
Private Sewer Line, Private Sewer Cleanout
Fuel Tank , Fuel Line
Source Serving: Federally Regulated PWS 200 ‘ 200 ‘ 100 ‘ 100 ‘
Source Serving: State Regulated 100 ‘ 150 ‘ 75 ‘ 75 ‘
Source Serving: Private 75 ‘ 75 ‘ 25 ‘ 25 ‘
Waterline 10 ‘ 10 ‘ 10 ‘ 10 ‘
This is a summary. For a complete set of separation distance requirements, refer to Drinking Water Regulations 18 AAC 80, and Wastewater Regulations 18 AAC 72.If you have any questions or concerns about meeting a separation distance requirement, please contact an Drinking Water or Wastewater Engineer BEFORE construction.
SummaryProtect your wastewater system• Don’t poison your system (pretreatment)
Protect your environment
• Keep inadequately treated sewage off the ground, out of groundwater and out of surface water
Protect your drinking water
• Don’t contaminate your drinking water by connecting it to wastewater
The majority of the illness in the world is caused by fecal matter.Water Supply and Sanitation Collaborative Council (WSSCC) 2008.
Summary
Call engineering if you have questions ….
ReferencesDrinking Water Engineering:
• http://www.dec.state.ak.us/eh/dw/dwmain/engineering.html
Wastewater Engineering: • http://www.dec.state.ak.us/water/wwdp/onsite/index.htm• http://www.dec.state.ak.us/water/wwdp/engineering/engineering.htm
EPA Cross Connection Control Manual: • http://www.epa.gov/ogwdw/pdfs/crossconnection/crossconnection.pdf
Alaska Drinking Water Regulations: • http://www.dec.state.ak.us/regulations/pdfs/18%20AAC%2080.pdf
Alaska Wastewater Regulations: • http://www.dec.state.ak.us/regulations/pdfs/18%20AAC%2072.pdf
Alaska Water Quality Regulations:• http://www.dec.state.ak.us/regulations/pdfs/18%20AAC%2070.pdf
Contacts
James MacInnis555 Cordova St.Anchorage, AK 99501(907) 269-4874James.macinnis@alaska.gov
Vanessa Wike555 Cordova St.Anchorage, AK 99501(907) 269-7696vanessa.wike@alaska.gov
DEC Drinking Wastewater Program Engineering Grouphttp://dec.alaska.gov/eh/dw/dwmain/engineering.html
DEC Drinking Water Program Engineering Group… coming soon …