SOIL AND EROSION CONTROL QUESTIONS AND ANSWERS

SOIL AND EROSION CONTROL
QUESTIONS AND ANSWERS

National Pollutant Discharge Elimination System Permit - ans-
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Regulates storm water discharges and requires compliance with the General Permit; regul
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ates discharges from construction sites that disturb 1 acre or more of soil. Requires permite
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es to implement specific water quality sampling and analytical procedures.
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State Water Resources Control Board - ans-
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Issued the NPDES Permit, Statewide Storm Water Permit and Waste Discharge Requirem
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ents for the State of CA
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Water Pollution Control Program (WPCP) - ans-
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Includes a combination of soil stabilization and sediment controls.
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Construction Site BMP (temporary control practices) - ans-Best conventional/
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available technology, six categories: sq sq sq




1 - temporary soil stabilization
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2 - temporary sediment control
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3 - wind erosion control
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4 - tracking control
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5 - non-storm water Managment
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6 - waste Managment and materials pollution control
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Temporary Soil Stabilization Measures - ans- sq sq sq sq sq




Consists of preparing the soil surface and applying a BMP to disturbed soil areas.
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- Scheduling
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- Preservation of Existing Vegetation
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- Hydraulic Mulch
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- Hydroseeding
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- Soil Binders
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- Straw Mulch
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- Geotextiles, Plastic covers, and erosion control blankets/mats
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- Wood Mulching
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- Earth Dikes/Drainage Swales and Lined Ditches
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- Outlet Protection/Velocity Dissipation Devices
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, - Sloped Drains
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- Streambank Stabilization
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Scheduling - ans- sq sq




Developing a sequence of construction activities with implementation of BMPs; purpose is sq sq sq sq sq sq sq sq sq sq sq sq




to reduce the amount and duration of soil exposed to erosion by wind, rain, runoff, and vehi
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BMP objectives: soil stabilization, sediment control, tracking control, wind erosion control,
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non-storm water management, materials and waste management. sq sq sq sq sq sq




Very first step in effective storm water program; shall clearly show how the rainy season rel
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ates to soil-disturbing and re-stabilization activities.
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Preservation of Existing Vegetation - ans- sq sq sq sq sq




Identification and protection of desirable vegetation that provides erosion and sediment co sq sq sq sq sq sq sq sq sq sq sq




ntrol benefits; limits of disturbance.
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BMP objective is for sediment control and non-storm water management.
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Temporary fencing shall be provided prior to clearing, especially on areas designation Envi
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ronmentally Sensitive Areas (ESAs); may limit the area available for construction activities. sq sq sq sq sq sq sq sq sq sq sq




Equipment and vehicles shall be kept away from trees; fires are not permitted within 100' of
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the drip line of any retained trees; no toxic or construction materials shall be stored within 5
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0 feet of the dripline of any retained trees.
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Trenching and Tunneling - ans- sq sq sq sq




Shall be as far away as possible, usually outside the dripline or canopy. Curve around trees
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to avoid large roots.
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If roots are encountered, consider tunneling under them, at least 18 inches below the groun
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d surface, and not below the tree center.
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Temporary Fencing - ans- sq sq sq




Orange polypropylene that is stabilized against ultraviolet light; shall be at least 1 meter (3.
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2 feet) tall, and shall have openings no larger than 2"x2".
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Fence posts shall be wood or metal, with adequate spacing to completely support fence in
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an upright position.sq sq




Removed last, after all other work is complete. sq sq sq sq sq sq sq




Hydraulic Mulch - ans- sq sq sq




Applying a mixture of shredded wood fiber and stabilizing emulsion or tackifier with hyrdos
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eeding equipment, which temporarily protects exposed soil from erosion by rain or wind.
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