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Ellsworth Sourcewater Protection Plan December 2004 Rev. September 2005 Page 11 of 63

and the Lake, they would likely not be a threat to drinking water even if they were out of compliance. Therefore no remedies are suggested for these sites.

2. Development along the Shoreline Development along the shoreline causes many PCSs including phosphorus from disturbed soils, nitrates, viruses and bacteria from septic systems, and hazardous materials such as petroleum products, batteries, paints, solvents, and pesticides. Use BMPs and ensure compliance with federal, state and local laws in all areas of the watershed, particularly the shoreline area. In particular:

  • o

    Encourage native vegetated buffers between developed areas and the Lake

    • o

      Route surface runoff safely to buffer areas

    • o

      Stabilize eroding areas

    • o

      Discourage the use of pesticides and fertilizers containing phosphorus

    • o

      As noted in Section 3 below, assure that all subsurface wastewater disposal

systems (SWDS) are in compliance with federal, state and local laws.

3. Large Unsewered Subdivision An unsewered subdivision is a high density commercial or residential subdivision,

condominium, or trailer park which disposal systems (SWDS) for the

depends on individual subsurface disposal of sanitary wastewater.

wastewater A properly

designed, constructed and maintained SWDS is can discharge nitrates, bacteria and viruses to compliance with federal, state and local laws for shoreline area.

not a PCS. A noncompliant system surface and groundwater. Ensure all SWDSs, particularly those in the

4. Engineered Subsurface Wastewater Disposal System An engineered SWDS is designed to infiltrate flows greater than 2000 gallons per day into the ground. A properly designed, constructed and maintained SWDS is not

a PCS.

A

noncompliant

system

surface

and

groundwater.

Ensure

all

SWDSs,

particularly

those

in

the

can discharge nitrates, compliance with federal, shoreline area.

bacteria and viruses state and local laws

to for

5. Leaky Underground Storage Tank A “leaky underground storage tank” (LUST) is a container 10% or more of which is beneath the ground surface, and which is used to hold oil or other petroleum-derived products. A “leak” is a release of some of its contents to the environment. Petroleum releases can contain contaminants like MTBE and others that may make water unsafe or unpleasant to drink. Releases can also result in fire and explosion hazards, as well as produce long-term health effects. A LUST in close proximity to a water supply may contaminate the supply. The LUST in the Branch Lake watershed has been removed according to DEP file information.

6. Above Ground Storage Tank An above ground storage tank (AST) is a container 90% or more of which is above the ground, and which is used to hold oil or other petroleum-derived products. Potential hazards associated with an AST are the same as those listed above for a LUST. An AST without proper containment in the event of a spill is considered to be a PCS. Encourage property and facility owners to install proper spill containment for ASTs.

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