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

Additional Information — Stabilized Construction Entrance
A stabilized instruction entranceis a @ of aggregateunderlainwith filter c1ti located at any @nt where traffic wilI
~ entering or leaving a construction site to or from a public right+f-way, streeL a(ley, sidewalk or parking area. The
puqmse of a stabilized construction entrance is to reduce or eliminate the tmcking of sedment onto public rights-of-way
or s~ts. Reducingfrackoutof sediments and otherpollutantsonto paved roads helps prevent de~ition of .dimtmts
into ld stotm tins and prmiuction of airlmrne dust.
Where traffic will h entering or leaving, a stabilized construction enttance should ix used at all pints of cmtstruction
in~ss and egress. NPDES ~tmits require that appmpriare measures lx implemented to prevent trackout of sediments
onto paved roadways, which is a signi.tlcant source of sediments derived from mud and dirt carryout from the unpaved
rods and construction sites.
StaMlized cmmtwt,ion enuances are mderately effective in removing sediment from equipment lmvrng a construction
site. The entrance should lx build on the level ground. Advantages of the Stabilized Construction Enuance is that it does
remove some sediment horn equipment and wrfes to cbaunel construction traffic in and out of the site at specified
l~aions. Efficiency is greatty increased when a washing rack is included as prt of a stabilized construction entrance.
The aggregate for a stabiliicd constmction entmnce aprons *ould ~ 1 to 3 iocks ti siz& W@ML we~-gra~d ~vel or
crushed rock. Minimum apron dmensicms
tral%c.
of 30 fL x 50 fi and 6 rnches deep is adequate for two-way ingredegress
The entnmcemust b propxly graded to prevent runoff from leaving the construction site.
when wash areas are provided washing is dme on a reinforced concrete pad (if signifimt washing is necew) or in
an ~ stabilized with crushed srone which chains into a prqxrly constructed sediment rrap or basin (ESC 55 and 56).
Sediment banitm are provided to prevent stxhments from entering into the stonnwater sewer systmt, diti, Orwmway.
● Construct on level ground.
● Stabiliml cutstruction entrances are rather expmsive to mnstruct and when a wash rack is includd a sediment trap
of some kind must also& provitkxtto collectwashwatermnoff.
● Requifes priodic top dressing with wlditional stotw.s.
● Should k used in conjunction with street swrxping on adj~t public right~f-way.
REFERENCES
Best Management F%wticesand Erosion Control Manual for Construction Site% Flcud Control District of Maricopa
County, Mz- Septerrkr 1992.
Manual of Standards of Erosion and Sediment Control Measures, i%mciadcm of Bay Area Govcrrunen&
June 1981.
Proposed Guidance Spcifying Management Mwm.ues for So-of Notpint Pollution in Coastal W- Work
Gnoup Working P~, USEPA April, 1992.
Stotmwater Management Water for the Puget SoundBasin,WashingtonState Deprunent of Ecology,The Tdw@.I
Manual - February 19X2 Publiattion # 91-75.
Viginia Ermion and Sedimentation Control HandlxmL Virginia went of Catsemation and R~tion, Division
of Soil and Water Conservation, 1991.
WaterQuality Management Plan for tbe tie Tahw Region, Volume II, Handbook of Management
Practiq TabmRegional Planning Agency - Novembr 1988.
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ESC24
lE!ik5
Construction Handbook 5.38 March, 1993
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