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07.07.2013 CHC Engr Civil Response-2nd comments.pdf
7/7/2013 Page1of1 Theerrorhasbeencorrected,suchthatallriangardensaremodelledat0.50-ft(6-Theerrorhasbeencorrected,suchthatallriangardensaremodelledat0.50-ft(6- inches)ofstagedepthand0.5-ftoffreeboard.Themodelsdemonstratethattheinches)ofstagedepthand0.5-ftoffreeboard.Themodelsdemonstratethatthe AscreenshotdirctlyfromACADhasbeenforwardedtoJeanieandJerry.Thearearepresentativeraingardenof38.078-ftx38.78-ft(=1450-sf).Thesystemstillpasses Iwillrevisethetexttoincludetheappropriatedescriptionofhowwaterquality ismeasuredinAutoCADas1450-sf.Ibelievethe2-sfdiscrepancyisaresultof roundingthecornersoftheraingarden.Ire-rantheWWHM4modelwitha Trenchdrainswillbeaddedacrosseachdriveway.Seetheattached. systemsarestillconservativelysized,ashadalwaysbeenintended.systemsarestillconservativelysized,ashadalwaysbeenintended. Response treatmentrequirementsweredetermined. withsurpluscapacity. Sheet5.5,Detail2showsadistanceof6”betweenthetopoftheraingardensoilandtherimoftheoutletforthewestraingarden.Themodeluses0.6ftfor areasnotzonedassinglefamilyresidentialthatcollectrunofffrom5ormoreparkingspacesshallinstalloilcontainmentcatchbasinsifanotherapprovedoil areenhancedtreatmentandoilcontrolneeded?Basicandphosphorustreatmentisneededandprovided.Also,pertheESCSChapter4.6.2.1,“Allprojectsin Page5-3,Section4.1.C–UsetheprocessdescribedinChapter2.VolumeVoftheSWMMWW,toassesstherunofftreatmentneedsforthesite.Specifically Inthe‘StormwaterDrainageStructureInformation”table,CB04Nhasanotethatsays“Setrim6”aboveRGgrade”fortheoutlet.Themodelhasavalueof drainagereportapprovedlastyearbytheCity.ThesiteislocatednorthofthissiteonHighway99.PleaseusesimilarlanguageintheCHCdrainagereport. porousconcretesorunoffshouldbelessthanimpermeableconcrete,however,theslopesoftheareastributarytotheseCBsarerelativelysteepandtheflowpathsforthegeneratedrunoffdoesnotappeartointersecttheseinlets.Optio nsincludere-gradingthesedrivewayareaswithmoreofacrownandadding Sheet5.0–ThelocationofCB06NandCB06Sinthedrivewayareasareofconcerninregardtorunoffbypass.Itisacknowledgedthattheseareaswillhave describetheprocessofselectingtherunofftreatmentrequirementsanddescribehowtheselectedtreatmenttrainmeetsthoserequirements.Itappearsthatthetreatmenttrainisappropriate,justnotexplainedwellinthereport.Th eBafflesinthevaultareagoodsubstituteforthedownturned+90’sinthe maintenanceschedulefortheremovalofoilandotherfloatablesfromthesecatchbasinsmustbesubmittedwithallplansforreview.”Thereportshould CBs,howeveritisnotdiscussedwherethesiteisahighusesiterequiringmorerobustoilcontrol.SeeenclosedexcerptfromtheSwedishCancerCenter Thenorthraingardenismodeledas38.1feetx38.1feetor1,452squarefeetofsurfacearea.Measuringthebottomareafromsheets4.0and5.2,this controlsystemisnotemployed.Theoutletpipeofthesecatchbasinsshallhaveadownturned90degreeelbowtorestricttheoutflowofoilandother floatables.Thereshouldbeatleast9inchesofclearancebetweentheelbowandtheinsidewallofthecatchbasintofacilitateremovaloffloatables.A CBstocatchtherunoffalongthecurbsorputinalargestripdrainacrossthedriveways,oranotherdesignthatbestroutestherunofftothevaults. C:\\CEKO\\Projects\\Active\\15011.01-CHC-Edmonds\\Outbox\\2013\\2013-07-08-Resubmittal\\BLD20130460-CHC-Edmonds-Civil-2nd-Comments-Responses.xlsx 0.75ftfortheriserheightwhichisdefinedasthedistancefromthetopoftheraingardensoiltoptheoutletrim.Pleasereconcile. Comment reviewermeasuresapproximately1,100squarefeet.Pleasereconcile. thisparameter.Pleasereconcile. Commentsfrom:JeanieMcConnell&JerryShuster CommunityHealthCenter SHEETC5.0–GRADINGANDDRAINAGEPLAN 23320Highway99 BLD20130460 CommentsDate:7/3/2013 STORMWATERREPORT ProjectAddress: Specific Application#: 1m-iii 1m-ii ItemNumber 1m-i 1i Project: