Scatter Creek Aquifer Area S eptic S ystem Management Proj ect - - PowerPoint PPT Presentation

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Scatter Creek Aquifer Area S eptic S ystem Management Proj ect - - PowerPoint PPT Presentation

Jun 19, 2023 195 likes •575 views

Scatter Creek Aquifer Area S eptic S ystem Management Proj ect Public Health and Social Services Department http:/ / www.co.thurston.wa.us/ health Scatter Creek Citizen s Committee S Chanele Holbrook andra Adix Tom Budsberg

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Scatter Creek Aquifer Area

S eptic S ystem Management Proj ect

Public Health and Social Services Department http:/ / www.co.thurston.wa.us/ health

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Scatter Creek Citizen’ s Committee

S

andra Adix

Tom Budsberg Dave Dafoe Karen Deal Lowell Deguise,

thru 6/ 4/ 14

Marlene Hampton Chanele Holbrook Roger Max Bruce Morgan Amanda Neice Maureen Pretell Gene Weaver

Public Health and S

  • cial S

ervices Department http:/ / www.co.thurston.wa.us/ health

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Public Health and S

  • cial S

ervices Department http:/ / www.co.thurston.wa.us/ health

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Scatter Creek Aquifer

Very vulnerable groundwater supply Sole source of water for more than

1,000 public water systems and single family wells

Over 18,000 people rely on the wat er

Rapidly moving groundwater

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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S catter Creek Aquifer

Areas in the aquifer have been

contaminated by land uses in past

Policies and regulations put in place have

helped protect water

The area is transitioning from agricultural

to rural residential

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Lan

Land Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Well Monitoring Network

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Monitoring Indicators

Coliform Bacteria

S

tandard – none

Nitrates

S

tandard 10 mg/ l

Precautions at 5 mg/ l

Other contaminants could be present

Viruses Pharmaceuticals Pesticides

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Monitoring Results … good news, bad news, and good news

S

ince 2008 nitrate levels have dropped throughout the aquifer

Oct 2013 sampling – nitrate levels rose

in many wells (one by 3mg/ l) and some unsatisfactory coliform bacteria samples

March 2014 nitrates down - Overall

trend is a decrease in nitrates

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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3.8 3.3 2.7 2.2 2.5 2.2

7.4 5.7 4.7 3.6 6.3 3.7 0.5 1.3 1.2 0.9 0.9 0.9

0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 2009 2010 2011 2012 2013 2014

Nitrate mg/L Year

Nitrate in mg/L

Average Maximum Minimum

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Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Septic System Management

Focus of this proj ect was looking at the

impacts of septic systems on the aquifer.

Opportunity to examine future impacts

and take action to protect safe drinking water

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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COMPUTER MODELING

Worse- Case S cenario

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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6th Model S cenario

Full build-out, lawn fertilizer, Tenino full capacity

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Citizen’ s Committee Conclusions

 The aquifer is vulnerable to contamination from septic

systems and land use activities.

 Nitrogen levels in the aquifer have decreased over time

and seem to be trending lower.

 Current aquifer conditions and worse-case predictions

do not warrant taking regulatory action at this time. The groundwater model predicts that average nitrate concentrations in even the most vulnerable part of the study area will be less than half the maximum contaminant level of 10 mg/ l.

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Citizen’ s Committee Conclusions

 The committee wants to be cautious and monitor

water quality so, if needed, we can take action before it is too late.

 Ideally monitoring should: evaluate trends, the

accuracy of the computer model, water quality in the deeper aquifer, the extent and duration of water quality spikes, chemicals of emerging concern, and pathogens such as viruses.

Public Health and S

  • cial S

ervices Department http:/ / www.co.thurston.wa.us/ health

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Citizen’ s Committee Conclusions

 In general, zoning, land use and health regulations have

protected the aquifer from nitrate and many other

  • contaminants. However, health and land use regulations

can be strengthened to help assure the optimal placement of new septic systems and wells to minimize the potential for contaminating drinking water supplies.

 The committee believes that with proper information,

education, and incentives, area residents will be good stewards and take action protect the aquifer.

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Recommendations

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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FLOW FLOW FLOW

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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FLOW FLOW FLOW

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Well

Public Health and Social Services Department http://www.co.thurston.wa.us/health

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Well

Public Health and Social Services Department http://www.co.thurston.wa.us/health

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Well

Public Health and Social Services Department http://www.co.thurston.wa.us/health

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Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Funding Strategy

  • 1. S

eek grants where appropriate

  • 2. Use existing stormwater fees
  • 3. S

eek funding from partners

  • 4. Use septic fees

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Coming Up

Final Recommendations presented to Board of Health: November 6, 2014

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health

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Proj ect Website: www.co.thurston.wa.us/ health/ ehsc 360-867-2582

Public Health and S

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ervices Department http:/ / www.co.thurston.wa.us/ health