New site planprovidedseparately

THIS IS THE DRAWING SET FOR THE "2020 LEACHATE POND PRIMARY GEOMEMBRANE ANDFLOATING COVER REPLACEMENT PROJECT". THESE ARE MARKUPS OF AS-BUILTS FROM1999. THE MARKUPSKUPPSS DOOO NOTNNOO SHOW THE NEW PRIMARY HDPE BOTTOM GEOMEMBRANE ONALL SHEETS, BUTBUUTT GIVEGG VVE INDICATIONSIN ICCAAT WHERE IT SHOULD GO, WHICH IS DIRECTLY ON TOP OFTHE EXISTING ONE. THE ORIGINAL FLOATING COVER DESIGN IS SHOWN IN THESE DRAWINGAND IS MEANTA T TOTOO BEB EMULATEDEMMULATEDD FORFO THE REPLACEMENT COVER.

THIS PLAN FOR REFERENCE ONLY

Afterr floatingf cover is removed,e perform the following steps forrinstallationllallallll of new primary geomembranegggegee liner for thethe pond:p ndd:pon1. Cleaneleee sludge of out existingtininn pond takingtaking greatgreeaatgr carecc not to damageexistingti primary geomembrane.ambrane. SludgeSS udgS and liquidd can be disposedof in existingg landfill.landfill.2.. Existinggnti gExistin primarypri geomembrane is conductive. Perform highvoltagle electric brush leak test on existing primary geomembrane,vacuum box test accessible extrusion welds below the crest, anddandrepair any defects found.3. Install new 200-mil bare geonet onn pondppo bottom and side slopes.4. Install new 6" leakage collectioniioollecti and vent piping shown on thisplan,n includingin gdiudlu repairsreeppaairs to anchornchc wall at penetrations.onsn5. RemoveReR existing inlet pipes, and spill overflow pipe pipes fromwhere they come into the pond, and remove the toe drainage pipes,to allow installation of new primary pond geomembrane. Reinstallthese pipes, plus one additional new one, after the newgeomembrane is installed.6. Install new primary 80-mil smooth conductive HDPEgeomembrane. Extrusion weld to existing primary geomembrane.Attach new geomembrane ata the pipe penetrationss on the floor andslopee as shown in the Detailsl no drawings C16 andd C18. In lieu ofboot around SLCRS carrier pipe shown on Dwg C15, wrapgeomembrane over top of pipe and batten to anchor wall. Bootaround the new leakage collection pipes at 3 locations.6. Perform high voltagle electric brush leak test onnon newneweewwww primaryppp yyygeomembrane.8. Install new rubsheets, re-install inlet pipingninp along withtttthhhhhhhhh oneeooooo newnnnneeewwpipe.

BeforeB ee weldingd or battening newprimarya geomembraneo along southside,e use hole-sawol to drill four 1.5"diadia holes at 757 ft. o.c. along southside of pond ini new primarygeomembranembrane 12" away from theinsideinsid edge of the anchor wall,takinggki gg carecca notnotoootottt totttotoo damageddddaaaammaaaagggee existingi tieeexxxiisisststtitinnngprimary geomembrane.g momeemmbbrannee.bbmmeeeeemmmbbrraaannneee SeeSSeeeeSSSSeeeSection B onnn DwgDwgDDDDwwwwgg C11.C11.CCC1111

Installs new 6" dia SDR17 perforated HDPE leakagekk collectioncollectand venting pipe on top of existing primary HDPE geomembrane,,e,neaneand line over the top with the new primary HDPEEE geomembrane..enPenetratee through the existing concrete anchor wallww at threelocationsc with solid non-perforatedrrrfooooraaateteeeddddd pipe.ppippppeeeee TerminateTTerminateaa pipespipes withwithhflange adaptors, backup rings, blind plates and gaskets.aa UseUsstainlessa steel nuts and bolts coated with anti-sieze.zz Anchor wallllalaaawwshalla be heightedghte by 6" vertically forr aaa length of 2 ftt over thehee topst spof these penetrations, with 2:1 slopes to merge backkkck intotoin existingt gntopp of wall. Use #6 rebar dowels for concrete addition.o

6'6'

Toe ofslope

Tee

Wye

45Elbow

6" HDPEperf pipe(Typ)

Rounded endcap (Typ)

Place clean rounded3/4" gravel to top ofpipes to these limits andcover with 16 oz NWNPgeotextile 12" beyondlimit of toe of gravel

This drawing shows approximate locations were previous repairswere made to the anchor wall. See Dwg C26 for details of repairdesign.

Encapsulated covere floatsfloats @@ 40'40' o.c.o.c. allallaround pond. Totalotal lengthlength approxapprox 1,523'1,523'

3"33"33 diadiadidia sidesideid weightwei htweighteightweight tubest b stubestub stubes @@@@@@ 40'40'404040 o.c.o.c.o c allllallallall arounddaroundaroundaround ponddpond.pond.pond TotalT t lTotalTotalTotal lengthl thlengthlengthlength approxapproxapproappro 1,226'1 221,2261,22611

6"6" diadi troughhgtt ghthhtiggee gwwe besbbbeetubtubes innnnnnnnnnn cornersrrandand alongallo m.mommmmbottob toob o xoxxpropppppppppppAppApprox totalttttttttttttttlengthlengtth 550'0'

REMOVEE EXISTINGEXISTING FLOATINGFLOATING COVERCOVER SYSTEMSYSTEM ANDAAND REPLACEREPLACE COMPLETECOMPLETE PERPER ORIGINALORIGINAL DESIGNSEDESDESIGN.SEDESSIGNSSDESIGN. ITIT ISIS ERMISSIBLEMPERMISMPERMMPERMISSIBLE TO ALVAGELSASALVAGE AND REUSEEEEEEEEEEEEEEEEEEUSERR THETHEFOLLOWINGOLLOWING EXISTINGEXISTING HARDWAREHARDWARE TOTO THEEHHTHE EXTENTEEXTENT REASONABLE:REASONABLE: PERIMETERPERIMETER BATTENBATTEN ANGLEGNAANGANGLEGNAANGANGLEGNAANGANGLE BAR;AABARBAR; MWATERMSTORMWAMSTORMWRRMRMMWWWWWAWAAATTEEEERRRSTOSTORMWATER SUMPSSSSUUUMMMPPPMP ASSEMBLYAAASASSEM LUDINGUUUULLLUCLLLLLLLLLLLCCCLNCNNNNNNNNNNCCCCCCCCCCCCCCCCCCCCCCCCCCCCCLUDINGINNNNNNNNNNNNNNNNNNNNNN HDPEPPIPING,PIPING, PUMPPUMP ANDAND ELECTRICALELECTRICAL ANDAND DISCHARGEDISCHARGE PIPE;PIPE; METALICMETALIC PARTSPARTS OFOF HATCHES.HATCHES.

Locationsns andand spacingspacing betweenbbbbbbetweeen thetht rowsow ofstiffenersene at thethe rssssssrsrsrrrrcornecorners toto matchm hatc existing.s i Approxspacingpa at bottombottom is 8'8 , andand approxrp spacingsp at topiss 2'2' (typical(typical forfor allall 44 orners).oooooooooococorners) WidthiW ofof doublerstripstrips shallshall bebe 6'6' ywherewwwwwwwwwwweveryweverywhere alongna o weightei tubesandnd throughthrough thethe wyewye intersectionsnninintersect son at bothbo ends.

This drawing is for reference only and is available in CAD ifdesired.

Weld new primary GM To old primary GM 6" from theexisting extrusion weld. There may be someexceptions to this exact weld location to bediscussed with Engineer in the field.

Utilize existing anchor bolts, allowing that up to 50 new bolts will have to be drilled and epoxy set . Re-use existingbatten bar. All other pieces of batten (nuts, washers, neoprene gasket) connection new as shown in originaldesign. Clean existing bolt threads with wire brush and apply anti-sieze to all bolt thread before installing nuts

to be replaced

new geonet

new primary GM

new geonet

REMOVEEEEEEEEEVVVVVVVVVO EXISTINGGGGGGGGGGGGNNNNNNNNTTTTTTTSSSSSSIIXIXIXXXXXXXEEEEEE FLOATINGGGGGGGNNNNNNNNIITTTTTTATATAAAAAAAOOOOOOOOLLLLLLFFFFFFF COVER SYSTEM AND REPLACE COMPLETE PER ORIGINAL DESIGN.Provideddididiivvvvvvv all new weight tubes, encapsulateduuuuususupppp floats, stiffeners, ropes, straps, hasps, snaps, and other fittings,attachements,aaaaaaaa and hardware.

Before welding or battening new primarygeomembrane (not shown) along south side, useuuuuuuhole-saw to drill six 1.5" dia gas venting holeseeeeeeee at 75ft. o.c. along south side of pond in new primarymmmmmmmmmmgeomembrane 12" away from the inside edgeeeeedddddd of theanchor wall, taking care not to damage existingeprimary geomembrane

Salvage and re-use existinghatches. Replace floats for thehatches.

Salvage and re-usere u existing wyeand riser assembly, as well aspump, and electrical wire.Discharge hose should be replaced.

Lengths of 12" dia sandtubes in sump: two at 5.5 ft(in direction of corners) andone at 6.5 ft (in direction ofmiddle of pond)

Ignore this pump. Itdoesdoe not exist.

Inlet pipes,sssssssss spillspppilllllspills illl drainddrraa nnn pipes,p ppppesss andaa d toettoooeeeeettt drain pipes to betemporarilylllllll removedmmmmoooovveededddmmmoovvvvveeee totto allowallloow installationiinnsttttaallaaaaaaaaa of new pondprimary geomembrane.omommmeemmmmmbrbrr eeeoo TheseTTT eeeeeeesssssseeeeeee pipesppppppiiipipppp shall be replaced totheir former operating positions when new primarygeomembraneg is installed. SOW shall include supply andinstallation of any required electrofusion couplings for theremodel, and new rubsheets. Rubsheets shall run-out10111 feet onto the pond floor and extend the entire length ofdrain pipe on the pond floor

Drill 10" hole through concrete wall tooocarry 6" HDPE SDR 11 pipe withmechanical link seal model LS-316.Provide inlet with flange adaptor, andlet-down pipepee toto bottombbboooootttttommmmmmm ofoooo pond.

New primary geomembrane shall wrap over the top of the 18" SLCRSriser pipe. Fill the gap between the pipe haunches and thegeomembrane with pre-cut Ethafoam pieces. In the zone around wherethe 18" pipe penetrates the anchor wall, use a batten-bar-and-gasketassembly to attach the new geomembrane to the anchor wall verticalface. The geomembrane attachment will have to transition from beingan extrusion welded connection to the embedment strip, to the battenbar, and back to the extrusion welded connection to the embedmentstrip. The batten bar should be 1/4" x 2" SS with oblong holes at 6" o.c.to accept epoxy-set 3/8" dia anchor bolts set a min. 3" into concrete.Where the batten bar crosses an extrusion weld the weld shall beground smooth.

Batten-barten-ba zone around 18" pipe

New primary geomembranem (new geonet not shown)

Supply and install new leakagecollection pipe 6" dia SDR 17HDPE btwn existing and newprimary geomembranes. SeeDwg C4B and Specifications

CutuCuuuuu concretennncrretee wallwwwwwa forf pipepenetrationaatttioonttinnnnnnnnneeeeet andaannnnndndddddddd raisera locally6". Seeeeee specifications.ssssssppppppp Thiszone will requireiiiirrrrrereeeeeee new battenennnbarbbbaar assemblyaassssseemmbbly providediiidddddddddd byContractor.

Boot new geomembraneeeeeeememmmmmmmmm around new leakage collection pipesat crest.

THIS 2" PVC PIPE MAY NEED TO BE CUT TO ALLOWINSTALLATION OF NEW LINER, AND PUT BACK IN PLACE WITHA REPAIR COUPLING AFTER THE LINER IS INSTALLED

Install new geonet and primary geomembrane (notshown) over existing , and weld new primarygeomembrane to this plate collar.

New leakage collectionpipe 6" dia SDR 17 HDPEbtwn existing and newprimary geomembranes.See Dwg C4B andSpecifications

Install new primary geomembrane (not shown)over existing , and weld new primarygeomembrane to this plate collar.

LoadingLoadingLo stationstation spillllspsp draindrain pipes,pipes and toe drain pipesto be temporarily removed to allow installation of newpond primary geomembrane. These pipes shall bereplaced to their former operating positions whennew primary geomembrane is installed. SOW shallinclude supply and installation of any requiredelectrofusion couplings for the remodel.

Disconnect stormwater discharge hose at this point. Remove stormwater hose, electrical cord, and pump assembly from existingfloating cover, and remove steel discharge piping as necessary to allow new floating cover installtion. Replace after new floatingcover is installed.

SOME PARTS OF THE EXISTING ANCHOR WALL ANDGEOMEMBRANE ATTACHMENTS HAVE PREVIOUSLYBEEN REPAIRED PER THE OLD DETAILS SHOWN ON THISDRAWING. NEW GEOMEMBRANE WELD LOCATIONS MAYNEED TO BE IMPROVISED IN THESE AREAS USINGTHESE DETAILS.

Likely location for weldingnew geomembrane