Libby River Watershed Survey Final Report

Impact of Site
High:	Direct discharge into the Marsh or a water body with obvious signs of pollution.
Medium:	Direct discharge into the Marsh or a water body with no obvious signs of pollution, or discharge into a buffer with obvious signs of pollution.
Low:	Discharges into a buffer with no obvious signs of pollution.
None:	No apparent discharge from the site.
Technical Level to Install
High:	Requires an engineered design to correct the situation, such as would be required for a stormwater treatment system.
Medium:	Requires a construction contractor with the necessary expertise and equipment to correct the situation, such as would be required for installing rip rap.
Low:	Landowner would be capable of correcting the situation using their own design and equipment, such as could be done by planting vegetated buffers.
None:	Does not require any technical expertise to correct a situation, such as picking up after dogs.
Cost
High:	Applies to projects requiring engineered designs and considerable earthmoving and installation of structures.
Medium:	Applies to projects with relatively limited earthmoving required, such as for reshaping ditches.
Low:	Applies to projects that could be conducted with hand labor, such as planting buffers.
None:	Applies to situations where an activity or ceasing an activity will have no added cost.

Sector--Site #	Land Use	Tax Map&Lot #	Street Name	Type of Problem(s)	Potential Pollutant(s)	Recommendation(s)	Impact of Site	Technical Level to Install	Cost
1--1	residential	R090022	Old Neck Road	storm sewer discharge	toxics, bacteria, nutrients, sediment	educate homeowners about pollution prevention and preventing pollutants from entering storm drains	High	Low	Low
2--1(a, b, c)	residential	R081821	Fogg Road	a) stormwater detention pond design and maintenance b) runoff from lawns c) ditch erosion	a) potentially inadequate treatment of stormwater pollutants b) toxics and nutrients c) nutrients and sediment	a) review pond sizing and outlet structure for better pollutant removal and perform regular pond maintenance to remove accumulated sediment b) educate homeowners about reduced use of fertilizers and pesticides and promote planting of buffers c) reshape and vegetate or rip rap ditch	a) Medium b) Medium c) Medium	a) High b) None c) Medium	a) High b) None c) Medium
2--2	residential	R092002A	Woodrock Drive	storm sewer discharge	toxics, bacteria, nutrients, sediment	educate homeowners about pollution prevention and preventing pollutants from entering storm drains	Medium	None	None
2--3	residential	R092002A	Val Terrace	storm sewer discharge	toxics, bacteria, nutrients, and sediment	educate homeowners about pollution prevention and preventing pollutants from entering storm drains	Medium	None	None
2--4	residential	U015009	Val Terrace	runoff from lawns	toxics and nutrients	educate homeowners about reduced use of fertilizers and pesticides and promote planting of buffers	Low	None	None
2--5(a, b)	residential	a) R092002 b) R081 and R092 lots	Clearwater Drive	a) storm sewer discharge b) runoff from lawns	a) toxics, bacteria, nutrients, and sediment b) toxics and nutrients	a) educate homeowners about pollution prevention and preventing pollutants from entering storm drains b) educate homeowners about reduced use of fertilizers and pesticides and promote planting of buffers	a) Medium b) Medium	a) None b) Low	a) None b) Low
3--1	town road	R081004A	Fogg Road	ditch erosion	nutrients and sediment	reshape and vegetate ditch	High	Medium	Medium
3--2	town road	R093024	Fogg Road	ditch erosion	nutrients and sediment	vegetate ditch	Medium	Low	Low
4--1(a,b)	residential	a) U003 lots b) U003005	Pleasant Road and Fogg Road	a) beach erosion and runoff from lawns b) storm sewer discharge	a) toxics, nutrients, and sediment b) toxics, bacteria, nutrients, and sediment	a) educate homeowners about reduced use of fertilizers and pesticides and promote planting of buffers b) educate homeowners about pollution prevention and preventing pollutants from entering storm drains, consider construction of a "sediment forebay" below the storm sewer outfall in pond	a) Medium b) High	a) Low b) Low for homeowner education and High for sediment forebay	a) Low b) Low for home owner education and High for sediment forebay
4--2(a,b)	residential	a) R0931213 b) R0931212	Ray's Circle	a) breached stormwater detention pond embankment b) storm sewer discharge	a) inadequate treatment of stormwater pollutants b) toxics, bacteria, nutrients, and sediment	a) repair pond embankment and include outlet structure for better pollutant removal, perform regular pond maintenance to remove accumulated sediment b) educate homeowners about pollution prevention and preventing pollutants from entering storm drains	a) High b) High	a) High b) None	a) High b) None
4--3	residential	R093031	Mast Road	storm sewer discharge	toxics, bacteria, nutrients, and sediment	educate homeowners about pollution prevention and preventing pollutants from entering storm drains	Medium	None	None
7--1	commercial	R091006	Spurwink Road	horse manure pile	bacteria and nutrients	plan for regular removal of manure to keep the pile small and maintain a vegetated buffer between the pile and any drainageways	Low	Low	Low
7--2	commercial	R091006	Spurwink Road	footpath erosion and runoff into stream	nutrients and sediment	install water bars across path to divert runoff into buffer on west side of stream, mulch bare soil on east side of stream	Medium	Low	Medium
7--3	commercial	R091006	Black Point Road	iron leaching into stream from base of dam	toxics and sediment	repair leaks in base of dam	High	High	High
7--4	commercial	R091006	Black Point Road	beach erosion caused by runoff from swimming pool deck	nutrients and sediment	divert runoff from pool deck around the beach and into a buffer	High	Medium	Medium
7--5	agricultural	R102008	Black Point Road and Spurwink Road	cow pasture draining into a ditch and pond	bacteria, nutrients, and sediment	fence cows out of the ditch and move fence back from pond to allow wider buffer to grow between the pond and pasture	Medium	Low	Low