Va Deq Esc Inspector Exam Questions And Correct Answers

VA DEQ ESC INSPECTOR EXAM
QUESTIONS AND CORRECT
ANSWERS



VESCP - ans-Virginia Erosion and Sediment Control Program
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- Administered by counties/cities (must), towns (may)
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- MUST BE APPROVED
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Minimum Standard 1 - ans-Stabilization
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permanent or temporary soil stabilization shall be applied to denuded areas within s
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even days after final grade is reached on any portion of the site; temporary soil stab
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ilization shall be applied within seven days to denuded areas that may not be at fina
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l grade but will remain dormant for longer than 14 days; permanent stabilization shal
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l be applied to areas that are to be left dormant for more than one year
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Site NOT at Final Grade - ans-- stabilize in 14 days
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- temporarily seed
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- mulch
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- permanently stabilize if dormant > 1 year
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Site at Final Grade - ans-- stabilize in 7 days (recommended immediately)
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- permanently or temporarily seed and mulch
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- mulch/matting/straw
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Minimum Standard 2 - ans-Stock Piles, Waste and Borrow Areas
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during construction, soil stock piles and borrow areas shall be stabilized or protected
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with sediment trapping measures
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mulch prevents erosion by protecting the surface from raindrop impact and silt fence
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intercepts and detains from disturbed areas
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Minimum Standard 3 - ans-Permanent Vegetation
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,permanent vegetation cover shall be established on denuded areas not otherwise pe
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rmanently stabilized (permanent vegetation shall not be considered established until
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a ground cover is achieved that is uniform, mature enough to survive, and will inhibit
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erosion *there is no % associated with this*)
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reduce erosion and decrease sediment yield from disturbed area
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this is the standard used to verify that a site is ready for release of bonds or surety
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Minimum Standard 4 - ans-First-Step Measures
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Sediment basins and traps, perimeter dikes, sediment barriers and other measures i
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ntended to trap sediment shall be constructed as a first step in any land-
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disturbing activity and shall be made functional before upslope land disturbance take
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s place
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a certain amount of initial land disturbance may be required to provide access for eq
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uipment to install the perimeter controls, but site clearing and grading should be kep
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t to a minimum until the perimeter controls are in place
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intercepts and detains small amounts of sediment from disturbed areas during constr
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uction operation to prevent sediment from leaving the site and decrease velocity of s
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heet flows and low-to-moderate level channel flow
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Perimeter Controls - ans- ws ws ws


assures that sediment does not leave the perimeter of the land-
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disturbing area once site clearing, grading, and construction commences
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Examples: silt fences, sediment traps, sediment basins, construction entrance, tempo
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rary diversions, diversions
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Minimum Standard 5 - ans-Earthen Structure Stabilization
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stabilization measures shall be applied to earthen structures such as dams, dikes, a
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nd diversions immediately after installation
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reduce erosion and sedimentation and reduce damage from sediment and runoff to
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downstream or off-site areas ws ws ws




Minimum Standard 6 - ans-Traps and Basins
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sediment traps and basins shall be designed and constructed based upon the total
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drainage area (not just disturbed area) to be served by the trap or basin
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, Sediment Traps - ans- ws ws ws


minimum storage capacity shall be 134 cubic yards per acre of drainage area and s
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hall only control drainage areas less than 3 acres
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*stone outlet = trap* ws ws ws




Sediment Basins - ans- ws ws ws


surface runoff from disturbed areas that is comprised of flow from drainage areas gr
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eater than or equal to 3 acres shall be controlled by a basin; minimum storage capa
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city of a sediment basin shall be 134 cubic yards per acre of drainage area; the outf
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all system shall, at a minimum, maintain the structural integrity of the basin during a
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s25-year storm of 24- ws ws ws


hour duration; runoff coefficients used in runoff calculations shall correspond to a bar
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e earth condition or those conditions expected to exist while the sediment basin is u
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tilized.

Sediment Trapping Devises - ans- ws ws ws ws


1. place near the lowest drainage points of a project
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2. install as a first-step measure [MS-4]
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3. stabilize immediately [MS-5]
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4. must include outlet protection for basins [MS-11]
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Minimum Standard 7 - ans-Cut and Fill Slopes
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roughening the surface of the slope decreases runoff, lowers the velocity runoff, incr
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eases water retention, and leads to better seed germination
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slopes that are found to be eroding excessively within on year of permanent stabiliz
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ation shall be provided with additional slop stabilizing measures until the problem is
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corrected

Minimum Standard 8 - ans-Concentrated Runoff
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shall not flow down cut or fill slopes unless contained within an adequate temporary
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or permanent channel, flume or slope drain structure
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outlets of these drains need outlet protection to prevent erosion from the concentrate
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d flow
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size of pipe depends on drainage area
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temporarily conduct concentrated stormwater runoff safely down the face of a cut or
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fill slope without causing erosion on or below the slope
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