Stormtech Tech Sheets August 11

1 70 Inw ood RoadSuit e 3 Ro cky Hi ll , CT06 067To ll Fre e 88 8-89 2-2 694Fa x 866- 328- 8401ww sheet # 1 Nove mber2012 General: 40%porosity is appropriate for the clean, open graded, angular aggregate material St or mTech re commends forfoundat io n andembedment. Most oftheporosity dataavailableisbasedona compactedcondition. St ormTechrequi re scompactionofthefo undati on(beddi ng)andall owsdumpedaggregateembedment around the chambers. Te stdata indicates that theaverage porosity of allgradatio nsof the co mpactedfoundati onis approximately40%. Theporosit y ofth edumped backfill in theembedment zone is typicall ygreater than40%andthecal culated weightedaverage porositytherefore exc eeds 40%fortypi cal St ormTech systems.

2 Porosity is protec tedfromsoils migrationbya non-wov en geotex tile that surrounds the entiresystem. Forsomeexfiltration syst ems,a dra in age net issubst itutedfor the geotextile onthebottomofthebed. Te rms:Compilationof Known TestDat a:SampleData S ourcePorosityBulkDensit yTes t / Desc riptionAASHTO # 4 Stor lbs/f t3dumped, corrected1 AASHTO # 57 Stormtech lab lb s/ ft3dumped, corrected1 AASHTO # 4 Stormtech lab lb s/f t3jigged& tamped, corr ected1 AASHTO # 57 Stormtech lab lb s/ ft3jigged & tamped, corr ected1 AASHTO # 57 NTH lab50- 51%tapped& agitated,dried2 AASHTO # 57 NTH lab 50- 52%tapped & agitated, dried2 AASHTO # 3 NTH lab 53- 54%tapped& agitated,dried2-1 Anders onEng. Cons.

3 Lb s/f t3dryrodded, C293-1 Anders onEng. Cons. lb s/f t3dryrodded, C293-1 Anders onEng. Cons. lb s/f t3dryrodded, C293-1 Anders onEng. Cons. lb s/f t3dryrodded, C293-1 Anders onEng. Cons. lb s/f t3dryrodded, C293-3/4 Anders on Eng. Cons. lb s/ ft3dryrodded, C293-3/4 AndersonEng. Cons. bs/f t3dryrodded, C293 StormTechadvisesthat a porosity of 40% isappropriate to usefor the storage capaci ty ofst ructural aggregate usedinthebedding andembedmentzones around Stormtech chambers . This memo provides technicalsupport fortheuse of a porosity of 40%. The majorpoints of the memo are: Porosity(n)is definedasth e volumevoidsovertheto talvolu meexp resse d as a percent:n = (Vv/ Vt) x 100%.

4 Otherte rmsco mmonly use d to describe porosit y in clu de; v oids and void sp ac e .A relat edtermthat should notbeconfusedwith poro sit y isvoi d ratio(e ) whichis thevolumeof vo idsoverthevo lume of solids ex pressedasa dec im al: e = Vv/ Reten ti on Water QualityA divisionofPage 2 of 2 Compilation of KnownTes t Data: tech sheet # 1 SampleData S ourcePorosityBulk DensityTest / DescriptionAASHTO # 4 Universal lb s/ ft3roddedC294 AASHTO # 57 Universal lbs/f t3roddedC294 AASHTO # 4 Universal lb s/ ft3roddedC295 AASHTO # 57 Universal lbs/f t3roddedC295-1 Crushed RockCTL T hompsonTX46% lb s/f t3roddedC296-1 Crushed Rock CTL T hompsonTX45% lbs/f t3roddedC296-1 Crushed Conc CTL T hompsonTX48% lb s/f t3roddedC2961 Testingwasconducted byStormTechinOctober,2003usingaggregatef r om Connecticut.

5 Waterwasusedtofi ll voids anda correctionfact orthatreducedporositie sby 3 to 16%wascalculatedandappliedto correc t forwall eff ectsofthetest container .2 Tes tin g wasconduct ed by NTH Consultant s, on, PA in December, was drytestingin accordance wi th the Ci vil Engineering Reference Manual, Sixt hEdition by Michael , byAnderson EngineeringConsultants,Inc.,Li ttleRock,ARinFebruary,2000for 7 di fferent aggregate s amples fr omfour suppliers in test ed was lime rockfr om central Flo rida. Test in g was conductedby Universal EngineeringSciences in Orlando, FL in Nov ember, 2005. 5 Thematerialtested was recycled,cr ushedco ncrete fro mcentr alFlorida. Te sting wasconductedby Univer sal Engineering S cience s in O rlando, FL in Nove mber , was conduct edbyCTL | ThompsonTexas, LLCin August ,2006.

6 ASTM C29 isthe S tandard Tes t Method forBulkDens ity (Unit Weight) and Voi ds in Aggregate .Porosity References: UrbanRunoff QualityManagement WEFMOP23 / ASCEMOP87. uniform sizedgravel at 40%. Controlling Urban Runoff: by Thomas R. Sch ueler, Ju ly 1987 describes storage vol umeof the voi d spacein thetr ench at 40%of th e ex ca vatedtre nchvolume. On-siteStormwaterManagement: ApplicationsforLandscape andEngineering Second E dition by Bruce F ergusonand Thomas Debost ates that opengraded crushed st onehas 40% 601 NON-WOVENGEOTEXTILE(OREQUAL)ADS 601 NON-WOVEN GEOTEXTILE (OR EQUAL)ALLAROUNDCLEAN, CRUSHED,ANGULARSTONEALL AROUND CLEAN, CRUSHED, ANGULAR STONEADS T ermsandConditi onsof Sale ar e ava ila bleon theADS websit e, ormTech is a re gisteredtrademarkof St ormTech , Inc.

7 Unive rsal EngineeringSciencesis a register edtra demark of Univers al EngineeringSciences. 2012 AdvancedDrainageSystems, In TS1 11/1270 Inw ood RoadSuit e 3 Ro cky Hi ll , CT06 067To ll Fre e 88 8-89 2-2 694Fa x 866- 328- 8401ww