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Ellsworth Sourcewater Protection Plan December 2004 Rev. September 2005 Page 7 of 63

  • Potential Contaminant Source Inventory

  • Land uses and zoning in the watershed

  • Trophic State Index

Drumlin’s assessment of Branch Lake encompassed the entire watershed with a specific focus on the shoreland and intake areas. They looked at natural features, man-made features and specific activities which may pose a threat to water quality. Based on these p a r a m e t e r s , t h e y f o u n d t h e o v e r a l l s u s c e p t i b i l i t y o f B r a n c h L a k e t o c o n t a m i n a t i o n t o b e low to moderate. However, at a sourcewater protection stakeholder meeting, a

representative from the DWP noted that the SWAP assumed that State land on the western shore of the southern basin was in conservation status, and that the risk would likely have been higher if the land had been developed or proposed for development as it is now. A summary of the recommendations from the assessment report follows:

  • Provide educational material and technical assistance to the approximately 250 shoreline home owners

  • Work with local residents and the Maine Department of Inland Fish & Wildlife to control recreational activities particularly in the south basin near the intake

  • Seek to implement a restricted access zone around the intake

  • Acquisition of additional land by the City, particularly around the intake

  • Support efforts to set up conservation easements

  • Continue to support the BPA

  • Initiate tributary stream monitoring

  • Expand existing lake water quality monitoring

VI. Potential Contaminant Source Inventory The purpose of a PCS inventory is to identify potential threats to the drinking water source. As noted above, Drumlin investigated the Branch Lake watershed for PCSs. They also reviewed a state database with information on potential threats to drinking water. This database was developed by the DEP and includes sites permitted by them which if managed properly should not be a PCS. The following site types are identified in the database:

Agricultural Chemical Use Ash Utilization Site Compost Site Engineered SWDS Infiltration/Retention Basin Landfill - Municipal Leaky Above-ground Storage Tank Marina/Boat Yard NPS (golfcourse, etc.) RCRA – Remediation Residuals Utilization Site Sand/Salt Storage Septage Disposal/Storage Site Surface Impoundment (SIA) Tank Farm Uncontrolled Site - All Other

Agriculture Nitrate Bacteria Automobile Graveyard/Junkyard Construction/Demolition Site Industrial Complex Landfill - Commercial Landfill - Special Waste Leaky Underground Storage Tank Mystery Spill RCRA – Large Quantity Generator RCRA – Small Quantity Generator Resource Extraction Activity Sanitary & Industrial WWTF Sludge Utilization Site Surface Spill Transfer Station Uncontrolled Site - DOD

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