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Appendix II. Maine Healthy Beaches Program Risk Assessment Matrix

Definitions

303d List The 303d list identifies water quality limited waters within the state, causes and sources of nonattainment of standards, and a timetable for the development of TMDLs (Total Maximum Daily Loads) or other management processes

to address attainment.

Actual v. potential pollution sources An “actual” source is one that has been documented or proven to impact water quality compared to a “potential” source which is likely impacting water quality but documentation is lacking.

Adjacent Nearby, neighboring, close.

Advisory An advisory posted on an MHB Program sign at the beach or on the Web site is a recommendation to the pub- lic to avoid water contact activities in those areas. Advisories are posted where bacteria results exceed the water quality standards for recreational water contact established by the US Environmental Protection Agency.

Analysis An examination of parts or elements and their interrelationships in making up a whole (i.e., examining pat-

terns in rainfall and bacteria levels to determine overall beach health).

Assessment Appraisal, measure: evaluate or estimate the nature, quality, ability, extent, or significance of.

Bacteria Unicellular organisms lacking a nucleus and chlorophyll; used in MHB Program to indicate the possible pres- ence of disease-causing organisms in recreational waters.

Beach A geological landform along the shoreline of a body of water usually consisting of unconsolidated material such as sand, gravel, cobbles, or pebbles. A marine beach is the zone of unconsolidated sand or gravel that extends landward from the mean low water line to the seaward toe of a dune. The definition of beach includes the beach face and berm. See also coastal sand dune systems.

Beach Berm Depending on the tide, this is the area mostly above water and is subject to wave activity.

Beach Management Area An entire beach or a segment of a beach that is managed independently from other beaches or segments due to potential pollution impacts or capacity of management to provide notification of water quality moni- toring results.

Coastal Sand Dune System Sand and gravel deposits within a marine beach system, including, but not limited to, beach berms, frontal dunes, dune ridges, back dunes, and other sand and gravel areas deposited by wave or wind action. Coastal sand dune systems may extend into coastal wetlands. See Maine DEP Chapter 355, Coastal Sand Dune Rules.

Closure A closure, more severe than an advisory, can be based on chronic high bacteria results or when conditions greatly increase pollution levels. While it is rare in Maine to have closures, they are generally linked to known safety hazards. For example, a beach may be closed as a result of sewage treatment plant malfunctions, severe flooding, rip cur- rents, sharks, hazardous surf conditions, and other safety hazards. A municipality must have a specific ordinance in place to close a beach.

Combined Sewer Overflows (CSO) Consist of mixtures of domestic sewage, industrial and commercial wastewaters, and stormwater runoff. Overflow may occur when the flow capacity of combined storm drains and sewer systems are exceeded during rainstorms.

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