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Ellsworth Sourcewater Protection Plan December 2004 Rev. September 2005 Page 10 of 63

Table 2 – Percent Cover by Land Use

Upland Mixed Forest

27.84

Upland Deciduous Forest

25.27

Lake/Open Water

16.05

Upland Coniferous Forest

11.65

Upland Scrub/Shrub

8.82

Grassland

5.57

Developed

1.34

Coniferous Swamp

1.26

Deciduous Shrub Swamp

0.83

Deciduous Swamp

0.57

Fresh Marsh

0.49

Agriculture

0.19

Bare Ground

0.06

Coniferous Shrub Swamp

0.06

Perennial Stream

0.00

Label

% of Total Watershed Area

The most notable change since the SWAP PCS inventory was completed is the increase in the number of large, private homes being built on or near the shoreline. The stakeholder discussions and field reconnaissance revealed these PCSs:

    • Development along the shoreline and on steep slopes in the watershed

    • Two subdivisions grandfathered by the City subdivision ordinance and allowed to exceed phosphorus allocation

    • Potential recreational development in the watershed

    • Three private unofficial dump sites

    • An historic gas pump within 150 feet of the lake

    • Three residuals utilization sites

  • 2.

    Hazardous Materials

Hazardous materials in the watershed include the petroleum products found in storage tanks, automobiles and boats. Commercial and household items such as lawn mowers, snow blowers, solvents, batteries and many other items contain hazardous materials and are considered to be PCSs. A stakeholder reported the application of an aquatic herbicide, also a PCS, to Branch Lake.

C. Suggested Remedies for Potential Contaminant Sources MRWA offers the following remedies for mitigating PCSs in the Branch Lake watershed.

1. Woodash Spreading Sites A woodash spreading site is a site at which the residue from the combustion of tree parts has been spread on the land. If managed properly, these sites are not PCSs. Potential threats from a site out of compliance would be heavy metals and nitrates leaching in to surface and groundwater. Due to the distance between these sites

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