Designation:C1131−10(Reapproved2015)StandardPracticeforLeastCost(LifeCycle)AnalysisofConcreteCulvert,StormSewer,andSanitarySewerSystems1ThisstandardisissuedunderthefixeddesignationC1131;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversproceduresforleastcost(lifecycle)analysis(LCA)ofmaterials,systems,orstructuresproposedforuseintheconstructionofconcreteculvert,stormsewer,andsanitarysewersystems.NOTE1—Asintendedinthispractice,examplesofanalysesinclude,butarenotlimitedtothefollowing:(1)materials-pipeliningsandcoatings,concretewallthicknesses,cements,additives,etc.;(2)systems-circularpipe,boxsections,multiplelines,forcemains,etc.;and(3)structures-wetanddrywells,pumpandliftstations,etc.1.2TheLCAmethodincludescostsassociatedwithplanning,engineering,construction(bidprice),maintenance,rehabilitation,replacement,andcostdeductionsforanyre-sidualvalueattheendoftheproposedprojectdesignlife.1.3Foreachmaterial,system,orstructure,theLCAmethoddeterminesinpresentvalueconstantdollars,thetotalofallinitialandfuturecostsovertheprojectdesignlife,anddeductsanyresidualvalue.1.4MajorfactorsintheLCAmethodincludeprojectdesignlife,servicelife,andrelevantinterestandinflationrates.2.Terminology2.1Definitions:2.1.1constantdollars—dollarsofuniformpurchasingpowerexclusiveofinflationordeflation.2.1.1.1Discussion—Constantdollarsarecostsstatedatpricelevelsforaspecificreferenceyear,usuallytheparticulartimethattheLCAisbeingconducted.2.1.2currentdollars—dollarsofpurchasingpowerinwhichactualpricesarestated,includinginflationordeflation.2.1.2.1Discussion—Currentdollarsarecostsstatedatpricelevelsineffectwheneverthecostsareincurred.Intheabsenceofinflationordeflation,currentdollarsareequaltoconstantdollars.2.1.3directcosts—thecostsofexcavation,removal,anddisposalofexi...
