EExisting istingg Conditions AhiEiAtmospheric Environment- AiAir QualityQ li ¾ The baseline assessment for Air Quality fromo tthe ee existing st g landfill a d will incorporate copoate the 7 years of measured data from the EXISTING LANDFILL SOURCES area into the AERMOD numerical Combustion Gases, VOC's and dispersion model. model Sulfur Compounds ¾ ThThe RRoadway dyg and d UUrban b BBackground k d sources will be evaluated through measurementtd data. t ¾ The most important component URBAN BACKGROUND off ththe air i quality lit studies t di are ROADWAY SOURCES SOURCES Exhaust the Volatile Organic Compound CbtiCombustion Gases, VOC's, Particulate (VOC) iimpacts t since i ththese GasesGases, VOCsVOCs, Particulate are the critical components of landfill emissionsemissions. Atmosphericp Environment- Dust ¾ The baseline assessment for atmosphericp dust will be based on the hhundreds ndreds of measmeasurements rements that hahave e been taken over the past 7 yearsyears. ¾ The baseline assessment will include Roadway Aggregategg g some iimpact t from f ththe existing i ti landfill l dfill DtDust Operations even though the existing landfill will no longer be contributing in any significant wayypp once activitiesti iti hhave stopped. t d ¾ The use of ambient measurements is General Atmospheric the best way to incorporate dust Backgroundg itfllthimpactsp from all the sources shown h ¾ Measured data shows that the dust environment is fairly typical of Eastern OOntario. Development of Terms of Reference for an Proposedp West Carleton Environmental Centre EA of f Proposed P d New N Landfill L dfill EExisting istingg Conditions AtAtmospheric h i EnvironmentE i t- OdOdour Working Drop Off Face Bins (No Longerg (No( Longerg in Use)) in Use) Landfill Gas Landfill Gas Leachateh Collection Landfill Landfill Collection Collection andd GGas OdOdours andd System Destruction* Destruction* *WM has spent tens of millions of dollars to upgrade the gas collection and destruction system ¾ The baseline odour assessment for the new landfill will include an evaluation of the existingg landfill after closure. ¾ The odour sources (shown above) will be evaluated using a numerical atmospherictpp h i didispersion i model d l ththat t will ill iincorporate py t 5 years of f hourly h l y meteorological data and thousands of modelled receptor pointspoints. AtAtmospheric h i EnvironmentE i t- NiNoise ¾ The baseline assessment for noise will itincorporatepp measured ddtblihd data, published data and traffic data from the area into Roadway Noise the CADNA and ORACLE noise modelsmodels. ¾ The model will evaluate noise sources (gas collectioncollection, landfill gas to energy plant) from the existing site that will Noise remain after the site is closed. Aggregategg g Sources ¾ The predominant sources of noise in the from Operations EistingExisting area are the roadways around the sitesite. SitSite Development of Terms of Reference for an Proposedp West Carleton Environmental Centre EA of f Proposed P d New N Landfill L dfill EExisting istingg Conditions AtAtmospheric h i EnvironmentE i t Odour Complaints d 4500 ved 4071 eiv 4000 ece Re R 3500 s nt 3000 ai 2500 mpl 2000 om C Co 1500 1222 o of 461 r 1000 ber 500 mb um 0 168 Nu 66 2006 2007 2008 2009009 2010 Year ¾ Odour complaintspy received directly and/or forwarded to Waste Management by other parties are documented and addressed in accordance with the comprehensive site-wide Certificate of Approval (Ai(Air)() ) NNo. 7816-7C9JMR7C9JMR. ¾ In this regardregard, a quarterly report is submitted to the Ontario Ministry of Environment as per Condition 7 of the Certificate of Approval summarizingi igp ththe odour d complaints l i t and d ththe mitigation iti g ti actions ti ttaken. k ¾ A total of 66 odoodour r complaints were ere receireceived ed dduring ring 20102010. ¾ WM staff analyzed each complaint to establish the source of the odour and to remedy the situation if warrantedwarranted. Development of Terms of Reference for an Proposedp West Carleton Environmental Centre EA of f Proposed P d New N Landfill L dfill EExisting istingg Conditions GlGeology &Hd& Hydrogeology l Topography & Drainage: ¾ Topography in the area surrounding the Study Area ranges from sandy upland areas in the northwest and west to poorly -drained swampy areas and the Carp River floodplain toward the northeast. The primary natural topographic feature in the area is a northwest-southeast trending sand and gravel ridge, historically used for sand & gravel extraction. ¾ SurfaceSu ace ddrainage a age around a ou d the t e Study Area ea is s controlled co t o ed by tthe e gground ou d surface su ace topography and small Carp River tributariestributaries, as modified by the surrounding quarryqyp operations and the Highway gy 417 drainage gy system. North and west of the existing sitesite, surface drainage flows within the Huntley Creek watershed,hd,g and ddih discharges via i Huntley H l y CCreek k to the h CCarp pg RiRiver. AlAlong the h western boundary of the West Envelope, Envelope there is a Provincially Significant WWetland tl d (PSW) () which hi h serves as a hheadwater d t for f local l l creeks k and d agricultural drains. drains Surficial & Bedrock Geology: ¾ ThThe surficial fi i l ggygeology l observed b d in i the th Study St d y Area A vicinity i i it y is i a mixture i t of f poorly to well -sortedsorted, stratified gravels and sandssands, interbedded with lenses off silty ilty sand d-gravelgpl till. till DDeposits it are hhorizontally i t ll y bbedded, dd d often ft displaying di pyg l i evidence of cross-beddingbedding. Near the eastern side of the North EEnvelope, l sand d and d gravel l predominate d i t the th surficial fi i l ddeposits; it ththese grade d into sand and till deposits to the westwest. Along the Highway 417 boundary of the West EnvelopeEnvelope, shallow organic and till deposits overlie the limestone bedrock. ¾ Bedrock in the Study Area consists of grey, fine to medium-grained fossiliferous limestone with some shaly or sandy interbedsinterbeds. The bedrock surfacesu ace gegenerally e a y sslopes opes in a north o t -northeasterlyo t easte y direction d ect o uunder de tthe e study areaarea. The bedrock is classified as the Bobcaygeon FormationFormation, a member of the Middle Ordovician-agedgp Ottawa Group. ¾ Alonggp,yg the western side of the West Envelope, the Bobcaygeon Formation is in contact with the underlying (older) Gull River FormationFormation, another member offth the OttOttawa Group. Gp The Th contact t tb between t these th bedrock b d kf formations ti is i along a faulted zonezone. The bedrock formations in the area are transected by ththese steeply tpy l dipping di pp i g normal l faults. f lt Fracture F t density d it y typically t yp i ll y increases i in i close proximity to the fault zonezone. Development of Terms of Reference for an Proposedp West Carleton Environmental Centre EA of f Proposed P d New N Landfill L dfill EExisting istingg Conditions GlGeology &Hd& Hydrogeology l Physical Hydrogeology: ¾ Twoo ggroundwater ou d ate uunits ts uunderlay de ay tthe e Study Area ea : i) ) uunconsolidated co so dated sasands ds and gravelsgravels, and the hydraulically connected weathered upper bedrock surface (overburden( -shallow bedrock zone);); and ii) ) deeper p bedrock fractures (deeper bedrock zone)zone). ¾ Shallow groundwater flow generally follows the bedrock topographytopography, with a watert ttable bl elevation l ti ffrom roughlygy hl 128 mASL ASL iin ththe southwest th t portion p ti of f the th Study Area to less than 112 mASL east of Carp RoadRoad. Groundwater within ththe overburden b d -shallowhll bdbedrock k( (southwest(p th t portion ti of fth the site) it)fl ) flows northwardnorthward. Groundwater in the overburden-shallow bedrock across the remainderid of fthStdA the Study Area flflows northeast. th t RRegional i l groundwater d t flflow iin the deeper bedrock is northeastnortheast, toward Carp RiverRiver. Groundwater Quality: ¾ Natural shallow groundwater quality in the Study Area is potablepotable, has relatively low dissolved solids content, and is composed of a higher proportion of calcium, calcium magnesium and bicarbonate ions relative to other majorj,yp ions, typical of shallow ggroundwater from limestone environments. ¾ Groundwater qyquality in the overburden-shallow bedrock in the northern portion of the North Envelope is generally consistent with background concentrations,ihild,g while groundwater monitoring iildfh gp completed as ppart of the regular environmental monitoring program for the operating landfill site has shownh hihighergp h concentrations t ti of f leachate l h t indicator i di t parameters t relative l ti tto background conditions along the southern boundary. Elevated concentrationstti of fdil dissolved d parameters t are also l seen ddowngradient ditfth of the stormwater management pondpond, in a former area of biosolids storagestorage. ¾ Observed shallow groundwater concentrations on the West Envelope are generally within the range of expected background concentrationsconcentrations, with slightly higher concentrations of alkalinity and potassium in the northeast. ¾ Groundwater in monitoring wells installed in the overburden-shallow bedrock zone on the downgradient side of the existing landfill generally has higherg e coconcentrations ce t at o s oof leachate eac ate indicator d cato paparameters a ete s relative e at e to background conditions, conditions due to leachate from the unlined portions of the waste disposalp areas. Development of Terms of Reference for an Proposedp West Carleton Environmental Centre EA of f Proposed P d New N Landfill L dfill EExisting istingg Conditions GlGeology &Hd& Hydrogeology l Remedial Efforts: ¾ A purge well remediation system has been installed to capture the natural groundwater flow before it leaves the landfill sitesite. It does this by drawing the water level down between pumping wells, effectively creating a hydraulic barrier along the downgradient boundary of the landfill.