Erosion and Sediment Pollution Control Program Manual.pdf

Level Spreader -----An earthen or mechanical structure constructed at the discharge end of a diversion
channel or dike to spread out the discharge over a low gradient, well-vegetated area.
Mechanical level spreaders are sometimes used to diffuse the discharge from a basin or trap
before it enters a wetland or riparian buffer.
Licensed Professional -----Professional engineers, landscape architects, geologists and land
surveyors licensed to practice in this Commonwealth.
Lifts -----Layers of loose soil. This term is used to specify how much loose soil should be laid down at
a time before it must be compacted or wrapped in geotextile fabrics.
Lime -----Calcium oxide (CaO) used in many water and wastewater treatment operations. Also called
Quicklime.
Limestone -----A sedimentary rock composed of calcium carbonate (CaCO3).
Limit of Disturbance -----The boundary within which it is anticipated that earthmoving, including
installation of BMPs, will take place.
Limiting Exposed Areas -----1. Minimizing the area to be disturbed by proposed earthmoving.
2. Minimizing the time period from initial disturbance to final stabilization.
Limnetic -----1. Relating to or inhabiting the open water part of a freshwater body with a depth that light
penetrates. 2. The area of a wetland without emergent vegetation.
Liquid Limit -----The moisture content at which soil passes from a plastic to a liquid state.
Liquifaction, Spontaneous -----The sudden large decrease in shear strength of a cohesionless soil
due to a collapse of the structure from shock or other type of strain usually associated with a
sudden but temporary increase in pore-fluid pressure. It involves the temporary transformation
of the material into a fluid mass.
Littoral -----1. Of or pertaining to a shore, especially of the ocean. 2. The shoreward zone of a lake or
wetland; the area where water is shallow enough for emergent vegetation to dominate.
Littoral Drift -----Sedimentary material moved along a shoreline due to the influence of waves and
currents.
Littoral Transport -----The movement of littoral drift along the shoreline by waves and currents. This
includes movement parallel — longshore transport — and perpendicular — on-offshore
transport — to the shore.
Live Staking -----A bioengineering technique in which cuttings from living branches are inserted and
tamped into the ground, where they eventually take root.
Load -----The amount of material being transported by a moving body of water.
Loading -----The quantity of a contaminant entering a water body.
Loading Capacity -----The greatest amount of a contaminant that can be added to a water body
without exceeding water quality limitations established for that water body.
Loam -----An easily crumbled soil consisting of a mixture of clay, silt, and sand.
Location Map -----Map insert on plan drawings and in the narrative showing the location of the project.
A photocopy of the USGS quad with the project outlined and the quad name provided is
recommended.
Loess -----Deposits of silt laid down by wind action.
Long Term Operation and Maintenance-----The routine inspection, maintenance, repair or
replacement of a BMP to ensure proper function for the duration of time that the BMP is needed.
Longitudinal Profile ----- A section of a stream, channel, pipe system, etc. along the length of its
centerline.
Longshore -----Parallel to and near the shoreline.
Losing Stream -----A stream or reach of a stream that is losing quantity of flow due to seepage into the
ground.
Low Flow Channel -----A stabilized channel constructed across the bottom of a detention basin or near
the center of a larger channel for conveying base flow.
Lower Bank -----Portion of the stream bank below the normal flow level.
M
Main -----Large sewer at which all other branches terminate.
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