2014 ANNUAL REPORT ADAPTIVE MANAGEMENT PLAN FOR REDUCING PCB S IN - - PowerPoint PPT Presentation

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2014 ANNUAL REPORT ADAPTIVE MANAGEMENT PLAN FOR REDUCING PCB S IN - - PowerPoint PPT Presentation

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2014 ANNUAL REPORT ADAPTIVE MANAGEMENT PLAN FOR REDUCING PCB S IN STORMWATER DISCHARGES SRRTTF JULY 23, 2014 City of Spokane Wastewater Management Study Area 2 Stormwater Management in Spokane 3 Pathway for PCBs to enter the Spokane

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SLIDE 1

City of Spokane Wastewater Management

2014 ANNUAL REPORT

ADAPTIVE MANAGEMENT PLAN FOR REDUCING PCBS IN STORMWATER DISCHARGES SRRTTF JULY 23, 2014

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SLIDE 2

Study Area

2

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SLIDE 3

Stormwater Management in Spokane

3

 Pathway for

PCBs to enter the Spokane River

 MS4: Municipal

Separate Storm Sewer System

 CSO:

Combined Sewer Overflow (less frequent)

Primary PCB Sample Locations

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SLIDE 4

Adaptive Management Plan

4

 Reduce PCBs in stormwater and CSO

discharges

1)

Analyze and interpret existing data

2)

Identify likely sources of PCBs.

Design and implement remedial actions and BMPs.

3)

Adaptive approach – further data collection and remedial action

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SLIDE 5

Catch Basin Investigation Areas

5

2012 Re- Sample

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SLIDE 6

2010 and 2011 Catch Basin Sampling

6

Highest in Heavy Industri al Zone = Re- sample in 2012

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SLIDE 7

2012 Catch Basin Sampling

7

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SLIDE 8

Remedial Maintenance

8

 Review Aroclor analysis results  Residential cleanup standard: 1.0 mg/kg  Remove all sediments from catch basins  Dump on separate pad, mix with sawdust  Haul to lined cell at landfill

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SLIDE 9

Curb Markers

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 Install markers at each basin after cleaning Installation in progress

throughout City on normal maintenance routes

  • Over 7,000 Installed
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SLIDE 10

2010 – 2012 Sampling Recap

10

  • 765 Catch Basins – broken into 76 Groups + individual basin

re-samples

  • 590,000 lbs sediments removed
  • 32.4 grams PCBs removed

2010 - 2012 Catch Basin Samples

  • Helped identify contaminated CB near City Parcel
  • Disconnected from MS4
  • PCBs still found in CBs after thorough cleaning in 2010 =

continual PCB source in area

  • Average ~ 30% reduction in re-sampled CBs
  • Multiple older industrial sources: wind-blown and track-off
  • Ecology re-evaluating City Parcel site to investigate residual

contamination off property Individual Samples

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SLIDE 11

Stormwater Sampling: 2012- 2014

11

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SLIDE 12

Stormwater Sampling

 Automatic composite samplers

Depth  Flow Rate  Sample s

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SLIDE 13

20,000 40,000 60,000 80,000 100,000 120,000 140,000

Union Outfall Union near City Parcel Cochran Washington CSO 34 CSO 06

PCB Concentration (pg/L) Legend

Median Minimum Maximum First Quartile Third Quartile Liberty Lake Study, urban stormwater "background"

Stormwater Sampling

13

“Average” City stormwater Commercial Heavy Industrial Near PCB Cleanup Site

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SLIDE 14

Correlations

14

Sep-12 Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-13 Oct-13 Nov-13 Dec-13 Jan-14 Feb-14 Mar-14 Apr-14

2 4 6 8 10 12 14 20,000 40,000 60,000 80,000 100,000 120,000 140,000 9/1/12 10/31/12 12/31/12 3/1/13 5/1/13 7/1/13 8/30/13 10/30/13 12/29/13 2/28/14 4/30/14

Wind Speed (mph) Total PCBs (pg/L)

Monthly Average Wind Speed Cochran CSO 34 Union @ City Parcel Washington CSO 06 Union Outfall "First flush" storm April 2013 windiest month since 2/1999; 8/25 Large dust storm from Columbia Basin; wind at SIA 62 mph Temperature inversion trapped wood smoke near ground surface Dry, windy Spring Temperature inversion trapped wood smoke near ground surface

SRRTTF Aerial Deposition Study

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SLIDE 15

Union Basin Disconnection

15

 PCBs ubiquitous

 Sources too numerous to track down individually

 Solution: treat and infiltrate stormwater

 San Francisco Estuary Institute BMP Toolbox for reducing PCBs in

stormwater

Image from www.filterra.com

Tree Box Filter Vegetated Swale

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SLIDE 16

Product Sampling

16

 PCBs are still incidentally produced in

manufacturing processes. City is sampling products in summer 2014:

  • Road paint: Yellow and

white

  • Liquid and dried
  • Thermoplastic tape
  • Hydrant Paint (Aluminum)
  • Utility locate paint (green)
  • Firefighting foam
  • Deicer
  • Vehicle wash soap
  • Pesticide/herbicide
  • Motor oil (new and used)
  • Diesel and gasoline
  • Dust suppressant
  • Antifreeze
  • Lubricant
  • Asphalt sealer
  • Crack sealer
  • Asphalt release agent
  • Hydroseed
  • PVC pipe
  • CIPP liner and Shortliner
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SLIDE 17

Product Sampling

17

 Backup Samples

  • DEF
  • Brake Fluid
  • Hydraulic Fluid
  • Motor oil (other brands)
  • Utility locate paint (other)
  • Windshield fluid
  • Vehicle wax

 Additional wastewater-related samples

  • Hand soap
  • Laundry soap
  • Dish soap
  • Shampoo
  • Toothpaste
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SLIDE 18

18

Decant Facility

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SLIDE 19

Ordinance (SMC 7.06.172)

19

 City shall provide preference for products and

packaging that do not contain PCBs

 No City department may knowingly purchase

products containing PCBs above the PQL unless it is not cost-effective (increasing the purchase price more than 25%) or feasible to do so.

 PQL = practical quantification limit, the lowest

concentration that can be reliably measured using EPA 1668

 Testing results may be requested from

suppliers

 Ordinance effective 7/16/2014

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SLIDE 20

Conclusions

20

  • Individual sources difficult to identify
  • Widespread, diffuse source of PCBs

 Legacy sources from historic industrial activity  PCBs found in everyday items (motor oil, hydraulic

fluid, etc.)

  • Designing treatment and infiltration in Union basin

(disconnect MS4 from river)

  • Integrated Clean Water Plan
  • Treat and infiltrate Cochran basin stormwater (and
  • thers)
  • CSO controls installed by 2017
  • NLT operating year-round