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HomeMy WebLinkAbout1998-08-19 Insubstantial Change Correspondence 2/24/17 Wheelabrator NOR'rH ANDOVER 2/24117 John Simons Chairman North, ,Andover Planning Board 120 Mlabi Street North Andover, MA 01845 Ash Storage, Enclioslure Replacernent Project Inscibstainfial Change Memorandum Dear Mr. Simon,%, Whee!labrafor respeCtfUlly offers the following memorandum fOF YOUir review and consideration and we look forward to, discussing the details, of the project with you on March 7, 2017. Should you have questions or concerns YOLIj wish addressed before then, please, don't hesitate to reach OLIt to ine. Most apprecibfively, Whielelabrator GaryCollette Plant Manager,, Whee'I,abirritor North Andover 285 Holt Rd 1� North Anclover, MA 0 1845, 978 688 16611 CeH 603 918 8469 www,.wtien-r,cly.coni JI Twitter @WTIEnerg y 2810[r,,Jl Vona d 0111845 �69786&8.9rM laxII&I94,8058 Ash Storage Enclosure Replacement Project-Insubstantial Change Memorandum Overview In May 1998, Wbeelabrator North Andover Inc. (flea Massachuseffs Refusetech, Inc-) filed an application for a Special Permit/Site Flan Approval' with the North Andover Planning Board. The application outlined the lnstallat{on of air.p Hution control equipment required b the fears Air Act and....subsequent r g €aki rises Th€s included repEa0 went of the e i tang electrostatic precipitators and [try sorbent injection systems with riew equipment consisting of a spray dryer absorber, fabric filters, a selective nary-catalytic reduction system, a powdered activated carbon injection system, and natural gas-fired auxiliary barriers- Th . o cinalso i v J+ etf.epc€osin the .....Vr,,, ':L. .., e istlr3 asl „rys t : b rr��Ce{ in order to better control potential fugitive einissionc, fl e ash ,,,,r.,-. ......_._'..........n.. enc osre ib--� -d-ir.. g 3s required issued airer : o...........- : calla Enviore pj..ef te _ f - n The North Andover Pilanning Board Rp.proved the Erniss€on Control Project on�1u��rst....1 , w........................ --T.�.,-----...,.....--..-. Wheelabrator North Andover is rio propos€n to replace the vertical sides and roof sections of the As_h' E iicE&ufe whit# were eneoted as part of an Emissions Control Project approved in Arigi� t 998. This existing Enclosure was composed of standard structural steel components wh( �...1gyp degradd__C .ec J[eir. he ash is dejive�ed to the ash storageidii a�rr�,rr�ois# condition which results in a humid atmosphere in the ash enclosure. The project involves a staged process of removing the existing steel enclosure sections, and replacing these sections with new pre-cast (Tilt-up) concrete panel and roof sections. Tl�e Clew pr ;gust gmgTt parcel omp2 Ilion will offer a io.gger life s an as compared to ti izing standard steel components pr du in r. or�cin environment for ern to es anddeliverirt a beiryt r €orig-terra building value,„„ Net-benefit of Improvement Wheelabrator's 41 years of experience building and operating Waste to Energy fac€Iitles (WTE) recognizes the susceptibility of steel to accelerated corrosion. Recent technological advances fn concrete panel Construction now present opportunities for €rr3provin material's of construction which over time will extend the service-life of ash enclosures. Wheelabrator now proposes to utilize this technique of construction at the Borth Andover facility. The project design Inc€udes the reatilization of the existing foundations which will be reinforced and doweled to support the new precast panels; erEosetooiprint- TEo. et scruber,vc �rentlocate iniie tie asE� tloufe,..ari tan a serr lly. i 1.-lie.re o ate irk a 46 ft cf*rje morn ad' ,,,w.to-,. *..,, ma �_,w ,. �acent to the East wall of the ash enclosure. The heig.tt..q!.the riild will char�q ppro imatel�+ .inches due to the thief Cie s pf ry..-.,... .......................n.....n.n--....-,.--- the r' roof parreEsx. vy l� aiE�e vi a rer r..cats stem fk ri inal.de igp levatioris, ,off he...0 sh..en 19.au(9,irnP _vQm_.rt.aptiyifje ,,w Whee[-abrator met with the MAQEP in November 2016 to discuss the need and intention to execute improvements to the ash enclosure, Wheela bra tor filed an application for a permit modification In early December 2016. Wheeiabrator anf€ ipggq receivingw t review ark approval ithin the next e l weeks, �Nn, Construction Sequencing Whee€abra,tor has developed a two-prase improverrnent approach which facilitates ash containment and mitigates the potential of fugitive emissiGns. during the construction period. Tl�is tavoYp} ase pp Q ..e t Ily.se rr eetis.the enclosure improvements between the main - - .............. ry. floor area of the ash storage enciosure and the track loading bay. The main floor area is the area where ashy is stockpiled prior to loading for offsite transport, the truck loading bay section is the area where trucks back into the enclosure and are leaded by #rout end loader for transport to landfill. Phase-One of the project focuses on improving the vertical sides and roof sections enchosing the rnain ash storage bunker area, and begins with a modification of the ash stacking conveyor and the erection of a temporary containment wall which effect€vely isolates the Phase-I and Phase-2 improvement zones. Duhng Phase-One, ash will be directly loaded into trailers within the Truck bay Section, and there wiII be no storage of ash within the Main Ash Storage Section of the enclosure. This will be accomplished by shortening the existing ask stacker conveyor so that the discharge point is directly above a trailer parked within the existing Tack Bay Section. This ash loadout configuration will he utilized throughout Phase-one portion of the project. Once the containment wall is in place, pre-demolition Gleaning activities will begin and shall include any needed hydre-blasting necessary for final inspecfion and demolition, FoIlowIng demolition, the bunker foundations and push-wa€i will be rein arced arkd dowelled to accept the vertical concrete panels and roof sections enclosing the Main Ash Storage Section of the ash enclosure, completing Phase-One activities. Phase-Two will focus on the replacement of the Truck Bay Section of the project and will begin with the ash stacker conveyor being extended back to its original design length, and ash storage and loadout activities shifting lack to the newly constructed Phase-One fish Storage Section. The temporary oontainmerrt that was initially constructed between the two sections will remain in place during Phase-Two and continue to provide environmental containment of ashy between the ash storage and load oot areas- Ash enchosure cleaning, foundation reinforcement, dowelling and panel erecting activities during Phase-Two +,mill remain consistent with the Phase-One description. Once Phase-Two activities are complete, the temporary containment wall will be removed, and trucks will again back into the Truak-Bay section for loadings completing the project- Normal operations will resume. Building footprint As mentioned prevfously, there will.be no Ghange t�1 th footprint of the Ash Enclosure, The now precast concrete paneis will utilize (he current existing foundations as their base. There wi€€ be a change In building heighI of appro ima.tely 6 inches solely due to the thickness of the precast concrete roof panels. Otherwise the buflding footprint and dimensions will rernain the same as the existing steel and fiberglass panel enclosure- Wet Scrubber The facility fnpfo s a it c.r bk er to previde..veriiiiatio to the ash bui:ldin q..re humid air to control fugkt.fve..dust at,the.poj.nts.. here..Et rqgy bo created- Tf Estin. # s r f N.dust. nd o tuTe-Jaden.,..a€r fry. .r#h. ,.s.Ea�ege.. .pip-agrp. The wet ucruboey fan, . hi�h..dr� :���...ti�r��gt}...th�.Y��l.����lb�er, end tiro fair a har t # cic are.purrepf#y*04oui<514e.tho.TrPcK.Bay rt on.South wall. Th.q�gf t�e...faeilfty is not re uired to continuousl operate the we# scrubber, the intent is to cGnfin ue Operating. tip ..,...,... ntil. �.v ...,.n.-n w....... . ..- .......-.n.,., ,-:.µ�. wet scrubber to �r�vide vealiorM kr� #fie Tramcar A?tajr� Asia tome ectfon is demo€lshed and irr� roved. This will be provided as long as €he wet scrubber ductworl can be sa�efy supported and riot interfere with the temporary corn#a[nment wall- The wet scrubber and fare assembly will ultimately be relocated during Phase Two of the project into a 462 ft2 machiire room positioned along the exterior east- ail of the ash enc€osure. The rie location will provide better access for maintenance and operation-..and keep.�11 - --- Y- ..-.. - -- --- - „� m........... ..-. .... -...._ pqq rp opt oft,of ifii7 attrerwfse Go, rosive environment, The relocation of the wet scrubber will be coordinated to minimize downtime of the system due to the relocation. The. change.ix -� �z . h. . .crbr..wNl.-tav ,t .�rrzpc -irk..peofnr .. terr3 €. .. Enviranmenta€ C ontainment and Monitoring During Phase-One and Two Activities Temporary containments will be provided for all activities currently enclosed with€n the existing enclosure. The main areas requiring containment include; + Along a column line In order to separate the temporary ash foadout operations in either the Truck Bay Section or Main Ash Storage Section during Phase-Offs and phase-Two + Over the portlon of the inclined asks conveyor exposed during Phase-Two. temporary b urn p out enclosure wi€l be provided at the west end of the Truck Bay Section during Phase=one activi.� rt _ kLlKts movement under-the modified asks er co� r}vey, Containments will consist of heavy reinforced poly materials securely fastened to either a wood or steel framing as necessary to produce ef€ective and complete enclosures- Afl conta inm e nt enclosures shall be consti-Wed to withstand weather and wind conditk)ns and will be insp 0 artd �x�sirttained throe hour` Phase-Ore and Two activities- --. heelabrator Pem=1 shall conduct monitorin�tE�rcu�c�94d�#�7 o��f f� ..�r�j ct to insure environmental controls are preventing fugitive emissions and imparts are being prevented. ................. be�v,� _.,., .,.,.ry records storacfe systemA r o.r ip� l o coring iiJ�b t# ,tQ 1,Je_ ADEP if requeatetl,,n v,..n S.cl t a1. ver i f tconlci berprovi led b i the a rf' Environmental onsr€ltant� i Items to be included on the formal internal monitoring are as follows- * Date, time and name of inspector. * Project phase, i.e., Phase I or Phase 11 and anticipated completion of the current Phase • Status of the wet scrubber, i.e., operating or out of service. It out of service, the reason will be rioted on the log, Status of the environmental containment structures and verification that the areas being used for ash rnanagernerit are sufficlently contained during de olit€on or construction, Any issues and corrective actions taken will be noted and well as sufficient information recorded on the location where the issue was noted. Description of any design changes implemented 0 Any other issues noted and corrective actions tatter. Conclusion The current ash storage enclosure was approved by the Planning Boards in August of 1998, This, existing Enclosures was. composed of standard structural steel cyrnp. ��t �-, i , ._taw, ................. ---.- ...-.-.-..- ------- -�..�� deg rdd.,� yor�d..�epa i r,, ReIacerrjerEt is imperative to tntegr€tomfi ie trcacture and safety of persorel. heelabratorprop ... .t place.fl . n- ste wew pre- . .. `i.- p. .conr. # parrd..rof.setiprprdcir� € a sa,� fer Vvokr _ rirorxent for facility empioyees..at d-0.e.U-% .g_a D ttee,Iopg.-l~ rrn b ilk The now precast concrete panels will be dowelled into the same foundations that have been in place since the project was approved. There will be no change to tyre building footprint and very little charge in overall height. Wheelabrator presented the protect to the North Andover Technical Review Committee (TRO) for the purpose of providing a project overview on December 28, 201& A member of the Conservation Commission conducting a site walls down during the first week of January validating that the project complied with all wetland set-back requirements and condudirig no other impacts were posed by the project Whee%Unbr re ceived no i ca[o� n via emmlmm no f urther action would be ne ed ed from the Conservation CommIssion. Based on the above, we re quest concurrence from the North Andover Pl an@ Board that this project 6 deemed insubstantial, mgd§ng no further Panning Board review. Thank you.