REMEDIAL ACTION WORK PLAN OPERABLE UNIT 2, LANDFILL ...
REMEDIAL ACTION WORK PLAN OPERABLE UNIT 2, LANDFILL ...
REMEDIAL ACTION WORK PLAN OPERABLE UNIT 2, LANDFILL ...
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Additional Information — storm Drain Inlet protection<br />
Stotmdraininletprotectionconsistsofasedimentfilteroranimpoundingareaaroundor upstreamofa stormdrain,dropinleL<br />
orcurlJinle~ThiserosionandsedimentationcmkrolBMPpreventsexcessivesedimentfromenteringstormdrainagesystem!<br />
prior to permanentstabilizationof thedisturbedarez<br />
All on-sitestorm drain inletsshouldIXproteaed. Off-site,inletsshouldlx protectmtin areaswhereconstructionactivity<br />
trackssedimentonto pavedareasor whereinletsreceiverunofffromdisturlx.dareas.<br />
Planning<br />
Largeamountsof sedimentmayenterthestormdrainsystemwhenstormdrainsareinstalledlxfore theupslop drainagearti<br />
isstabilixtL orwhereconstructioniszdjacenttoanexistingstotmdtain. incasesofextremesedimentloading,thestormdraim<br />
itselfmay clog and losea majorport-ionof its capacity. To avoidtheseproblems,it is neceswry to Pevent sedimentfrom<br />
enteringthe systemat the inlets.<br />
Inletcontrolmeasurespresentedinthishandhkshould notlx usedforinletsdrainingmorethanoneacre.Runofffromlarge]<br />
dlsturlxxlams shouldlx fu%troutedthrougha Temprary SedimentTrap(seeESC 56). Differenttyp of inletprotection<br />
are appropriatefor differentapplicationsdqxmchngon site conditionsand the typeof inlet. Inlet prot@ion mettds rm<br />
presentedin this hartdtik should~ approvedby the lwa.1stormwatermanagementagency.<br />
General Design●nd sizing criteria:<br />
● Gratesand spacesaroundall inletsshouldlx sealedto preventseepageof sediment-ladenwater.<br />
● Excavatesediient sumps(wherended) 1to 2 feetwith21 si& slcp aroundthe inlet.<br />
tnstal!ation prrmdures for filter fabric fence:<br />
a. Plxe 2 inchby 2 inchwmlen stakesaroundthe~rimeter of theinletamaximumof 3 feetapartanddrivethemat leasl<br />
8 inchesinto the ground. The stakesmust k at lwst 3 feet long.<br />
b. Excavatea trenchapproximately8 incheswideand 12inchesdeeparoundtheoutside@tnder of the stakes.<br />
c. Staplethefilterfabric(formaterialsandspcifictions, seeSiltFenceESC50)towoodenstakesso that32inchesof tht<br />
fabricextendsout and art Ix formedinto the trench. Useheavy-dutywire staplesat least one inch in length.<br />
d. BdcfW the trenchwith 3/4 inchor Icsswashedgravelall thewayaround.<br />
htallation prmedure for blink and gravelfalter:<br />
L P& bardwarecloth w compamblewiremeshwithone-halfinchopnings overthe drop inletso that the wireextench<br />
a minimumof 1fmt Ixymd tich sideof theirdetstructure.Lfmorethanonestripisnecesmry,overlapthestrips. Plau<br />
falterfabricover the wiremesh.<br />
b. Pke concreteblwks lengthwk on theirsidesin a singlerow aroundthe@meter of the irtle~so that the openend<br />
f= outwanl not upward. Theendsof adjawtt blocksslmdd abtm Theheightof thebarriera & vmia depdirq<br />
on designneeds,by stackingcombitwionsofbl@s thatare4 incheq 8 inches,and 12inchts wide. TIErowof blcdc<br />
shouldlx at least 12inchesbutno grmter than 24 incheshigh.<br />
:. PIu wiremesh over the outsideverticalfam (opt end)of the concreteblinks to preventstone fromWing washe(<br />
throughthe bldcs. Use bardwareclothor comparablewiremesh withone half inch o~nings.<br />
i. Pile washedstone againstthe wiremesh to the topof the blocks. Use 3/4 to 3 inchgravel.<br />
Mallation procedure for grovel and wire mh filters:<br />
L Pla% wiremeshover thedropinletso thatthewireextendsa minimumof 1fmt kyond eachsideof theinletstructure<br />
Use hardwareclothm comparablewiremeshwith one-halfinchopenings. IfmorethanoneSrnpof meshis necessary<br />
overlapthe sttips. Plac falterfabricoverwiremesh.<br />
ESC54<br />
Construction Handbook S-nl March, 1993<br />
@m~
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