REMEDIAL ACTION WORK PLAN OPERABLE UNIT 2, LANDFILL ...

Additional Information — construction Road Stabilization
Areas which are graded for construction vehicle transport and pinking purposes are especially susceptible to erosion and
dus~ The ex~sed soil surface is continually dismr~~ leaving no opporn.mity for vcgeutive stabilization. Such areas
alSOtend to collect and transport runoff waters aIong their surfaces. During wet wmtber, they often become muddy
quagmires which generate significant quantities of sediment that may @lute nearby streams or be transported off-site on
the wheels of construction vehicles. Dirt’roads can become so unstable during wet weather that they are virtually
unusable.
Efficient construction road stabilization not only reduces on-site erosion but can significantly s-d on-site work. avoid
instances of immobilized machinery and delivery vehicles, and generally improve site efficiency and working conditions
during adverse weather.
Where feasible, rdtemarive routes should k made for construction traffic one for use in@ condition, the other for wet
conditions which incorporate the measures listed for this BMP. Petmanem roads and parking areas should k pavwt as smn
as possible after grading. As an alternative where consuuction will k phased, the early application of gravel or chemical
stabilization may wlve ptendal erosion and stability problems. Temprary gravel roadway should lx considered during the
rainy season and/or on slopss grmer than 5 pm~n~
When grovel road is nrded, apply a minimum 4-inch course of 2 to 4-inch crushed rcc& gravel base, or crushed surfacing
base course immediately after grading or the completion of utility installation within theright-of-way. Chemical stabilization
may also be used upn compacted native subgrade (see the Dust Control BMP ESC 21). These chemical contds should
lx applied ~r the manufacturer’s directions.
Tem~rag roads should follow the contour of the natural termin to the maximum extent ~ssible. Slope should not exceed
15pc.en~ Roadways should h carefully graded todrairt tm.nsversely. Provide chainage swales on each side of the roadway
in the ~ of a crowned section, or one side iu the ase of super-elevated section. Simple grovel ttetms without a trench can
also be used.
Installed inlets should lx protected to prevent sediment-bden water from en~fig the storm sewer system (see “Storm Drain
Inlet Rotection” ESC 54).
REFEmcEs
Best Management Praetiees and Erosion Control Manual for Construction Sites, Fled Control District of Maricopa
County, Aizom Scptemim1992.
ManuaJ of Standards of Erosion and Satiment Conuol Measures, Association of Bay ~ Governments, June 1981.
Stormwater Management Water for the Puget Sound Basin, Washington State Deprutment of Ecology, The T~hnia.1
Manual - February 1992, Publication # 91-75.
Virginia Erosion and Sedimentation Control Handbook Virginia Department of Consenat.ion and Recreation, Division
of Soil and Water Consemation. 1991.
Water Qlt@ Management PlaII for the k Tahw Rgion, Volume ~, kdhk of Management kaetices, Tahm
Regional Planning Agenq - Novendxr 1988.
I ESC23
Construction Handbook 5-36 March, 1993