Appendix B. Landfill Footprint Net Effects Table

Transcription

1 Appendix B Landfill Footprint Net Effects Table

2 Option #1 DRAFT Master Net Effects Tables - Alternative Landfill Footprint Options al Alternative Landfill Footprint Option #1 Atmospheric Geology & Hydrogeology Odour Predicted odour emissions. No 99.5th percentile concentrations at off-site receptors are predicted to be above the MOE s odour objective of 1 odour unit per cubic metre of air (10-minute averaging period). Air quality businesses and institutions). Modelled Landfill Gas Emissions: o Vinyl Chloride o Benzene o Hydrogen Sulphide businesses, and institutions). Modelled Dust Emissions: o Total Suspended Particulate Matter o Inhalable Particulate Matter (PM 10 ) o Respirable Particulate Matter (PM 2.5 ) businesses, and institutions) 1 Progressive installation of the landfill gas collection and destruction systems (flaring or utilization). Implement Best Management Practices (BMPs) to ensure odour from disposal is minimized. No 99.5th percentile concentrations at off-site receptors are predicted to be above the MOE s odour objective of 1 odour unit per cubic metre of air (10-minute averaging period). No off-site receptors affected. No off-site receptors affected. No maximum concentrations at off-site receptors are predicted to be above the applicable O.Reg. 419/05 standard. Design and implement landfill gas control systems (gas collection, flaring and utilization). Implement BMPs to ensure landfill gas fugitive releases are minimized. No off-site receptors affected. No off-site receptors affected. No off-site receptors affected. Maximum concentrations at two off-site receptors are predicted to be above the applicable O.Reg. 419/05 standard, Ambient Air Quality (AAQC) or CWS. Two off-site receptors will be affected (William Mooney Road and Wilbert Cox Drive). Modelled Combustion Emissions: No maximum concentrations at off-site receptors are o Carbon Monoxide predicted to be above the applicable O.Reg. 337 AAQC. o Nitrogen Oxides businesses, and institutions) Noise Predicted site-related noise. Noise levels are predicted to be between 39 and 74 dba at receptors. Acceptable levels are noise levels at or below 55 dba or within 3 db of background sound levels. Groundwater quality Groundwater flow businesses, and institutions). Predicted effects to groundwater quality at property boundaries and off-site. Predicted groundwater flow characteristics. Design and implement dust control systems (routine cleaning of haul routes). Design and implement dust control systems (routine cleaning of haul routes). Efficient traffic flow of on-site vehicles. Maximum concentrations at two off-site receptors are predicted to be above the applicable O.Reg. 419/05 standard, AAQC or CWS. Two off-site receptors will be affected. No maximum concentrations at off-site receptors are predicted to be above the applicable O.Reg 337 AAQC. No off-site receptors affected. No off-site receptors affected. Exceedances are expected at five representative off-site receptors. Acceptable levels are noise levels at or below 55 dba or within 3 db of background sound levels. The Generic Design Option II has been developed to ensure that the Groundwater Protection Standards (Reasonable Use Limits) are met at the base of the leachate containment system. Further contaminant attenuation in the buffer area is not required. The existing hydrogeologic conditions are suitable for monitoring groundwater quality downgradient of the proposed landfill (i.e., groundwater flow and quality are determined and predictable). Development and implementation of an al Monitoring Plan (EMP) appropriate to the option will ensure that Reasonable Use Limits continue to be met at the property boundaries. Minor drawdown of water levels in the overburden-shallow bedrock and deeper bedrock are predicted at the property boundaries (<0.11 m). The predicted drawdowns are much less than natural seasonal variations associated with varying amounts of precipitation. The existing hydrogeologic conditions are suitable for Implement major construction activities to occur prior to the start of operation period. Maintenance to keep haul trucks in good condition. Implement Noise BMPs. Screening berms. Efficient traffic flow of on-site vehicles. No mitigation measures are required beyond the implementation of an EMP that is appropriate to the landfill footprint option. No mitigation measures are required beyond the implementation of an EMP that is appropriate to the landfill footprint option. Possible site-related noise at some receptors from time to time. Five receptors are predicted to be affected from time to time with levels above 55 dba or greater than 3 db above background.

3 Alternative Landfill Footprint Option #1 Surface Water Resources Terrestrial Aquatic Surface water quality Surface water quantity Terrestrial ecosystems Aquatic ecosystems Predicted effects on surface water quality on-site and off-site. Change in drainage areas. Predicted occurrence and degree of off-site effects. Predicted impact on vegetation communities due to project. Predicted impact on wildlife habitat due to project. Predicted impact of project on vegetation and wildlife including rare, threatened or endangered species. Predicted changes in water quality. monitoring groundwater flow downgradient of the proposed landfill. Development and implementation of an EMP appropriate to the option will ensure that groundwater supplies are not disrupted. The minor localized groundwater drawdown will not have a significant effect on the provision of baseflow to the surface water environment. However, the location of the proposed landfill footprint alternative encompasses a drainage course leading from the Goulbourn Wetland Complex. Accidental seep of leachate to surface. Roadway drainage may increase Total Suspended Solids (TSS) and related parameter concentrations in Huntley Creek (South Branch) at William Mooney Road. Wetland drainage blocked by landfill increased wetland water levels and potential negative impact on existing natural environment. Increased peak flows at William Mooney Road due to reduced Time to Peak from landfill slopes. Loss of: o 8.2 ha of meadow communities o 2.2 ha of thicket communities o 3.0 ha of forest communities o 3.3 ha of wetland communities which are associated with the adjacent Provincially Significant Wetland (PSW). This represents a total of 16.7 ha of vegetation to be removed. Increase of Edge Effects resulting in an increase in: o Invasive species; o Windthrow; o Soil compaction; o Root damage to trees. Impact on the hydrology of the adjacent PSW. Leachate contamination within adjacent vegetation affecting growth of native species. Loss of 16.7 ha of vegetated habitat for observed area sensitive bird species such as the black and white warbler. Loss of agricultural hayfields, displacing the eastern meadowlark and savannah sparrow. Loss of 5 area sensitive breeding bird territories Interruption of wildlife movement across agricultural fields between core woodlands. Increase in nuisance species populations within the PSW due to landfill location, such as: raccoons, skunks, rats, mice, gulls etc. Disturbance to breeding birds and other wildlife through construction noise and landfill operation. Risk to Butternut (a species listed as threatened under the Species at Risk Act) observed adjacent to the proposed site. Removal or realignment of 878 m of Tributary C. Tributary C is an intermittent agricultural drain with seasonal flow and the watercourse is important for surface water conveyance from the adjacent wetland (Tributaries A and B) and downstream to Tributary D during the spring freshnet. The positioning of the landfill adjacent to tributaries A and B may increase sediment loading, decreased water quality, and impacted surface water A two stage Stormwater Management (SWM) facility to provide TSS removals and emergency leachate seep storage in Stage 1 and post- to pre peak flow control in Stage 2. Divert wetland flow around landfill using naturalised open channel and culverts for roadway crossings. Two stage SWM facility where Stage 2 attenuates post development flow to pre-development levels. Compensation for the loss of vegetation communities could occur in elsewhere on-site where there are areas that could be revegetated. A Compensation and Restoration Plan will be developed during detailed design to address the exact location of these areas. Wetland areas occurring outside of the PSW boundaries should be confirmed and delineated with the MNR during detailed design as there is potential for these areas to be complexed with the current wetland. Installation of protective fencing. Access restrictions/prohibition. Use of dust suppressants. Establish buffers between landfill and natural areas. A system to treat leachate will be developed in conjunction with the preferred landfill footprint during detailed design. Revegetation in adjacent areas could compensate for the loss of bird habitat. Removal of vegetation should occur outside of breeding bird season (May-July). Provide restoration and compensation areas in vegetation gaps where the development of a corridor is possible. When possible, salvage plant material for restoration from areas where vegetation will be removed A Compensation and Restoration Plan will be developed during detailed design to address the exact location of these areas. Installation of a fence along the perimeter to deter species from entering the landfill. Establish buffers between landfill and natural areas. Install dense planting within buffers. Create buffers between the landfill and natural areas. Tributary C could be realigned from near the confluence with Tributaries A and B for conveyance purposes. Silt fencing, storm water holding ponds and other erosion and sediment controls could reduce sedimentation. Proper installation and designation of stockpile areas could reduce some of the impact on the surface water runoff. Discharge to surface water with no increase in TSS and related parameter concentrations in Huntley Creek (South Branch) at William Mooney Road. No increase in wetland water levels. No increase in peak flows at William Mooney Road ha of vegetation will be removed, including 3.3 ha of unevaluated wetland immediately adjacent to the PSW, and compensated for elsewhere. Reduced impacts resulting from increased edge effects. No impact on the hydrogeology of the adjacent PSW. No leachate contamination of adjacent vegetation. Loss of 16.7 ha of vegetated habitat for observed area sensitive bird species and additional agricultural land, to be compensated for elsewhere within the site. Permanent interruption of wildlife movement between core woodlots; however, wildlife will adapt to move in areas of contiguous vegetation. No increase in nuisance species populations within the PSW or browse on trees within vegetation areas. Construction disturbance to breeding birds and wildlife minimized through the establishment of vegetated buffers. No impact on rare, threatened or endangered species within the area. Realignment of Tributary C would maintain some surface water conveyance, however there may be increased runoff and contaminant loading from the surrounding land use due to the loss of some of this agricultural drain. 2

4 Alternative Landfill Footprint Option #1 runoff. Archaeology & Cultural Heritage Transportation Land Use Cultural and heritage resources Archaeological resources Effects on airport operations Effects from truck transport along access roads Effects on current and planned future land uses Predicted impact on aquatic habitat due to project. Predicted impact on aquatic biota due to project. Cultural and heritage resources on-site and in vicinity and predicted impacts on them. Presence of archaeological resources on-site. Significance of on-site archaeology resources potentially displaced/disturbed. Bird strike hazard to aircraft in Local Study Area. Potential for traffic collisions. Disturbance to traffic Proposed road improvement requirements. Current land use. 3 Removal or realignment of 878 m of Tributary C. Tributary C is an agricultural drain and there is evidence that this provides seasonal fish habitat. Removal or realignment of sections of Tributary C will affect the connectivity to Tributary D of the South Huntley Creek which is an important part of fish habitat. Tributary C is an intermittent agricultural drain that provides seasonal fish habitat. If work is carried out in the dry months, there will be no impact on the aquatic biota. Potential to impact three cultural landscape units: o Disturbance to a farmhouse located in the north corner of the footprint; o Disturbance to a farm house located south of the footprint; and o Disturbance to a portion of the William Mooney roadscape. There is potential for pre-contact and historic sites on the locales of higher ground, particularly along the treed western margin of the area (see ASI and GII 1999). There is also the potential for historic sites within 100 m of Richardson Side Road and William Mooney Road. The Ministry of Culture has stated the site has low archaeological potential. Potential for bird strikes (mainly gulls) at Carp airport due to local gull movements and aircraft flight patterns. More conflicts between left turning trucks and through traffic on Carp Road. Truck traffic volumes will be similar to those during previous operations; however, the volume of through traffic will increase. Increased delay for northbound traffic on Carp Road due to left turning trucks waiting in the roadway to complete their turn. Truck traffic volumes will be similar to those during previous operations; however, the volume of through traffic will increase. Proposed northbound left turn lane will add a minor amount of paved surface with minimal effect on runoff, maintenance and related activities. Other improvements on Carp Road by the MTO and the City of Ottawa are planned to address traffic operations issues resulting from non-site-related traffic at locations adjacent to the Site. Official Plan designation is General Rural Area. Zoned as Rural Countryside under Ottawa Comprehensive Zoning By-Law. Existing land uses include, Agriculture, Wooded Area, Idle and Shrub Land, and Low Density Residential. Tributary C could be realigned from near the confluence with Tributaries A and B and to maintain connectivity with Tributary D of the South Huntley Creek This section could be naturalized and there may be habitat enhancement opportunities. Alternatively compensation for the habitat loss could occur elsewhere in the Huntley Creek Sub-watershed. All works to be carried out in the dry (likely summer-fall). Proposed alterations within the study area will be suitably planned in a manner that avoids any identified, above ground, cultural heritage resource, where possible. Cultural heritage value / significance of displaced or disrupted built heritage resources will be evaluated. Relocate the resource if significant. Supply evaluation report to the local municipal heritage committee. Where resources are disrupted by visual, audible or atmospheric conditions vegetative screening should be considered. Conduct a Stage 2 archaeological assessment within all undeveloped lands in the selected area of construction impact in order to identify any archaeological remains that may be present in advance of any construction. Conduct a Stage 2 archaeological assessment within all undeveloped lands in the selected area of construction impact in order to identify any archaeological remains that may be present in advance of any construction. Continue existing gull management program, which includes harassment techniques (pyrotechnics, gas cannons) and lethal reinforcement. Prepare an Integrated Gull Management Plan, which includes passive and active deterrents. The site entrance location now meets warrants for a left turn lane northbound on Carp Road due to traffic volume. The site entrance location now meets warrants for a left turn lane northbound on Carp Road due to traffic volume. Design and construct road improvements in accordance with City policies, standards and practices. There will be some loss of fish habitat however there are opportunities to realign the watercourses to maintain connectivity and to create or improve habitat in adjacent tributaries. Tributary C appears to support some fish during the freshet although on a seasonal basis, therefore would not be classed as permanent fish habitat. If works are carried out while the channel is dry (no flow), there will be no impact to the aquatic biota. Disturbance to three Cultural Landscape Units in the vicinity of the A completed documentation report for archival purposes will be prepared. Potential relocation of a significant built heritage resource will be considered. Potential adverse effects to potential archaeological resources would be avoided or mitigated. Potential adverse effects to potential archaeological resources would be avoided or mitigated. Bird strikes would be minimized from gulls originating from the WCEC. Improved safety in comparison with existing conditions with the separation of northbound through and left turning traffic. Improved operations for northbound through traffic in comparison with existing conditions. Minor temporary construction related effects. Current land uses removed and replaced with a waste management facility. Loss of Agriculture, Wooded Area, Idle and Shrub Land, and Low Density Residential lands. Planned future land use. The Rural use of the lands would be discontinued. Mitigation measures related to landfill operation may reduce The Rural use of the lands would be discontinued.

5 Alternative Landfill Footprint Option #1 Economic Displacement of agricultural land Effects on the cost of services to customers Continued service to customers Economic benefit to local municipality Type(s) and proximity of off-site recreational resources within 500 m of landfill footprint potentially affected. Type(s) and proximity of off-site sensitive land uses (i.e., dwellings, churches, cemeteries, parks) within 500 m of landfill footprint potentially affected. Current land use. Predicted impacts on surrounding agricultural Type(s) and proximity of agricultural operations (i.e., organic, cash crop, livestock) and intensive farm operations in surrounding area. Ratio of air space achieved to volume of soil to be excavated and area of cell base and leachate collection system to be constructed. Future development of the four vacant residential lots within the site vicinity area may be subject to Official Plan policies that require a study demonstrating that the proposed development would not be affected by the landfill, and that the proposed development would not affect landfill Policies regarding development of contaminated sites may also apply. No off-site recreational resources within 500 m of the landfill 28 residences plus 4 vacant residential lots are found within 500 m of the landfill Loss of dairy farm and part- time beef farm. Loss of mainly Class 4 agricultural capability soil. Change in Official Plan designation, which is currently identified as General Rural Area. No potential effects to other surrounding agricultural the extent of the Influence Area, as defined in the Official Plan, thus excluding the vacant residential lots. Measures will be put in place to manage nuisance related effects during construction and operation. Acquire properties. BMPs will be implemented by WM to ensure nuisance related effects are mitigated in relation to surrounding agricultural No off-site recreational resources within 500 m of the landfill 28 residences plus 4 vacant residential lots are found within 500 m of the landfill Loss of dairy farm and 1 part-time beef farm. Loss of mainly Class 4 agricultural capability soil. Area is generally low agricultural soil capability as evidenced by the General Rural Area designation. No impacts on surrounding agricultural None Existing farm operations in the proximity to proposed landfill footprint will continue to operate. Ratio of airspace achieved to total amount of soil handled is 6.5 mil m 3 to 1.9 mil m 3. Ratio of airspace achieved to total amount of soil handled is 6.5 mil m 3 to 1.9 mil m 3. Total optimized site capacity and site life. A total optimized site capacity of 6.5 mil m 3 over 10 years. A total optimized site capacity of 6.5 mil m 3 over 10 years. Employment at site (number and duration). Up to 75 new jobs in waste diversion, disposal and green energy facilities for the next ten years. Up to 75 new jobs in waste diversion, disposal and green energy facilities for the next ten years. Opportunities to provide products or services. Continue services to customers for waste disposal. Continue services to customers for waste disposal. Effects on Residential and Commercial Development Effects on Property Tax Revenue on the City of Ottawa Residential development plans. No impact on residential development plans. No impact on residential development plans. Commercial development plans. No impact on commercial development plans. No impact on commercial development plans. City of Ottawa. Municipal Property Assessment Corporation (MPAC). Transition from agricultural to industrial property tax rate. Loss of dairy farm and 1 part-time beef farm. Transition from agricultural to industrial property tax rate. Loss of dairy farm and 1 part-time beef farm. Transition from agricultural to industrial property tax rate. Loss of dairy farm and 1 part-time beef farm. Transition from agricultural to industrial property tax rate. Loss of dairy farm and 1 part-time beef farm. Social Aboriginal Visual impact of the facility on surrounding areas Predicted changes in perceptions of landscapes and views. Local residents Number of residences. Recreational facilities Potential effects on Aboriginal communities Type(s) and proximity of off-site recreational resources within 500 m of landfill footprint potentially affected. Potential effects on use of lands for traditional purposes. Visible from rural residential area to the north and northwest along Richardson Side Road. Visible from Hwy 7 / Hwy 417 interchange to the south. No visibility issues along the west, east, and most of the south edges due to existing vegetation and existing topography. 28 residences within 500 m of the landfill Approximately 6,100 residences within 3 km of the site perimeter. No recreational facilities within 500 m of potential landfill Initial information from Aboriginal groups and the Ministry of Aboriginal Affairs and INAC indicates that WM property, upon which this alternative is proposed, is not subject to any current land claims. Extensive berm/ vegetation buffer treatment to be installed along north and northwest edge of footprint to create visual screen from residential areas and roadway. Short length of berm/ vegetation buffer treatment to be installed along south edge of site. Measures will be put in place to manage nuisance related effects during construction and operation. Consultation with Aboriginal groups will continue throughout the EA process. Installation of visual screening elements would obscure views of the facility from surrounding areas. 28 residences within 500 m of the landfill Approximately 6,100 residences within 3 km of the site perimeter. No recreational facilities within 500 m of potential landfill No effects on Aboriginal communities. 4

6 Alternative Landfill Footprint Option #1 Site Design & Operations Site design and operations characteristics Complexity of site infrastructure. Site will require leachate, gas, and storm water (SW) controls. Leachate generation rate for closed footprint estimated to be between 1.8 to 2.9 L/s. No mitigation required. Need for leachate, gas, and SW control is dictated by O. Reg 232/98. No mitigation required. All leachate generated will need to be treated. Leachate generation rate is influenced by factors including footprint size, final contours, and the design and maintenance of the final cover. Desirable to minimize longterm leachate generation rate. Site design will incorporate leachate, gas, and SW controls in accordance with O.Reg 232/98. Leachate generation rate for closed footprint estimated to be between 1.8 to 2.9 L/s. Base grading design would likely require at least two low points/ leachate pumping stations. No mitigation required. Number of low points/ pumping stations is largely dictated by grading design. Key constraints in developing grading design are to balance cut/fill requirements while maintaining the base of the liner system above the shallow ground water table. Base grading design would likely require at least two low points/ leachate pumping stations. Leachate collection system (LCS) cleanouts will need to be located around perimeter and in centre of site. No mitigation required. LCS cleanouts are required and location of cleanouts is dictated by footprint size/shape. Desirable to minimize need for cleanouts in centre of site. LCS cleanouts will need to be located around perimeter and in centre of site. Site likely require design and construction of two Stormwater Management (SWM) ponds. No mitigation required. Number of SWM ponds dictated by footprint size/shape relative to existing topography. Typical objectives of SWM design include maintaining gravity drainage to minimize need for active pumping. Site will require design and construction of two SWM ponds. Distance from farthest of two leachate pumping stations to existing leachate treatment facilities at SE of existing landfill is approx. 2350m. Distance from farthest point of footprint to existing gas management facilities at SE of existing landfill is approx. 3200m. Minimum haul road length to reach footprint from Carp Road is 1,375 m. Landfill footprint encroaches on William Mooney Road necessitating road closure and acquisition by WM. No mitigation required. Footprint alternative is expected to utilize existing facilities at SE of existing landfill, necessitating construction of pipelines. No mitigation required. Footprint alternative is expected to utilize existing facilities at SE of existing landfill, necessitating construction of pipelines. No mitigation required. Entrance from Carp Road is only reasonable alternative. No mitigation required. Continued use of William Mooney Road by waste haulers concurrently with public creates road hazards and precludes good site security. Longest leachate forcemain length is approx. 2350m. Longest gas forcemain length is approx. 3200m. Minimum haul road length to reach footprint from Carp Road is 1,375 m. Necessitates closure and WM acquisition of William Mooney Road. Requires importation of approximately 1,481,000 m 3 of soil and granular material for base liner, LCS, and final cover construction. No mitigation required. Material requirements for base liner, LCS, and final cover are dictated by footprint size as well as design requirements identified in O.Reg. 232/98. Requires importation of approximately 1,481,000 m 3 of soil and granular material for base liner, lcs, and final cover construction. Operational flexibility. Requires importation of approximately 374,000 m3 for base grading earthworks. Base grading design with two low points affords flexibility to commence filling in two locations without need for temporary leachate collection measures. No mitigation required. Volume of imported fill is dictated by base grading design, site topography, and resultant cut/fill balance. No mitigation required. Number of LCS low points/ pumping stations is dictated by grading design. It is preferable to start filling at the low point of the landfill to minimize need for temporary leachate collection measures. Requires importation of approximately 374,000 m 3 for base grading earthworks Base grading design with two low points affords flexibility to commence filling in two locations without temporary leachate collection measures. 5

7 Option #2 al Alternative Landfill Footprint Option #2 Atmospheric Geology & Hydrogeology Odour Predicted odour emissions. No 99.5th percentile concentrations at off-site receptors are predicted to be above the MOE s odour objective of 1 odour unit per cubic metre of air (10-minute averaging period). Air quality businesses and institutions). Modelled Landfill Gas Emissions: o Vinyl Chloride o Benzene o Hydrogen Sulphide businesses, and institutions). Modelled Dust Emissions: o Total Suspended Particulate Matter o Inhalable Particulate Matter (PM 10 ) o Respirable Particulate Matter (PM 2.5 ) businesses, and institutions) Progressive installation of the landfill gas collection and destruction systems (flaring or utilization). Implement Best Management Practices (BMPs) to ensure odour from disposal is minimized. No 99.5th percentile concentrations at off-site receptors are predicted to be above the MOE s odour objective of 1 odour unit per cubic metre of air (10-minute averaging period). No off-site receptors affected. No off-site receptors affected. No maximum concentrations at the off-site receptors are predicted to be above the applicable O.Reg. 419/05 standard. Design and implement landfill gas control systems (gas collection, flaring and utilization). Implement BMPs to ensure landfill gas fugitive releases are minimized. No off-site receptors affected. No off-site receptors affected. No off-site receptors affected. No maximum concentrations at off-site receptors are predicted to be above the applicable O.Reg. 419/05 standard, Ambient Air Quality (AAQC) or CWS. No off-site receptors affected. Modelled Combustion Emissions: No maximum concentrations at off-site receptors are predicted o Carbon Monoxide to be above the applicable O.Reg. 337 AAQC. o Nitrogen Oxides businesses, and institutions). Noise Predicted site-related noise. Noise levels are predicted to be between 40 and 68 dba at receptors. Acceptable levels are noise levels at or below 55 dba or within 3 db of background sound levels. Groundwater quality businesses, and institutions). Predicted effects to groundwater quality at property boundaries and off-site. Design and implement dust control systems (routine cleaning of haul routes). Design and implement dust control systems (routine cleaning of haul routes). Efficient traffic flow of on-site vehicles. No maximum concentrations at off-site receptors are predicted to be above the applicable O.Reg. 419/05 standard, AAQC or CWS. No off-site receptors will be affected. No off-site receptors affected. No off-site receptors affected. Implement major construction activities to occur prior to the start of operation period. Maintenance to keep haul trucks in good condition. Implement Noise BMPs. Exceedance is expected at 1 nearest off-site receptor. Screening berms. Acceptable levels are noise levels at or below 55 dba or within Efficient traffic flow of on-site vehicles. 3 db of background sound levels. The Generic Design Option II has been developed to ensure that the Groundwater Protection Standards (Reasonable Use Limits) are met at the base of the leachate containment system. Further contaminant attenuation in the buffer area is not required. The existing hydrogeologic conditions are suitable for monitoring groundwater quality downgradient of the proposed landfill (i.e., groundwater flow and quality are determined and predictable). Development and implementation of an al Monitoring Plan (EMP) appropriate to the option will ensure that Reasonable Use Limits continue to be met at the property boundaries. The EMP will need to consider impacts from the existing (unlined) landfill This can be done with a series of monitoring wells between the footprints, monitoring wells on the downgradient side of the new footprint, and by including leachate quality monitoring from the new landfill liner system for comparison purposes. No mitigation measures are required beyond the implementation of an EMP that is appropriate to the landfill footprint option. No maximum concentrations at off-site receptors are predicted to be above the applicable O.Reg 337 AAQC. Minimal site-related noise at receptors. One off-site receptor will be affected. Acceptable levels are noise levels at or below 55 dba or within 3 db of background sound levels. 6

8 Alternative Landfill Footprint Option #2 Surface Water Resources Terrestrial Groundwater flow Predicted groundwater flow characteristics. Minor drawdown of water levels in the overburden-shallow bedrock and deeper bedrock are predicted at the property boundaries (<0.21 m). At locations of the current downgradient receptors, the water level drawdown is predicted to be <0.11m. The predicted drawdowns are much less than natural seasonal variations associated with varying amounts of precipitation. The existing hydrogeologic conditions are suitable for monitoring groundwater flow downgradient of the proposed landfill. Development and implementation of an EMP appropriate to the option will ensure that groundwater supplies are not disrupted. The localized groundwater drawdown predicted in the north buffer area (approx to 0.25 m) would be expected to affect the water levels in the local wetland along the northern property boundary. The wetland would be expected to be reduced in aerial extent and depth of standing water. Surface water quality Surface water quantity Terrestrial ecosystems Predicted effects on surface water quality on-site and off-site. Change in drainage areas. Predicted occurrence and degree of off-site effects. Predicted impact on vegetation communities due to project. Predicted impact on wildlife habitat due to project. Accidental seep of leachate to surface. Roadway drainage may increase Total Suspended Solids (TSS) and related parameter concentrations in Huntley Creek (South Branch) at Carp Road. Reduced flow north to Richardson Side Road due to landfill drainage diversion. Less than 5% reduction in 1:5 Year flow at Richardson; Some potential to reduce minor flooding. Connecting swale flow maintained only by adjacent surface and groundwater flow. Increased peak flows in west ditch along Carp Road due to diversion. Existing landfill SWM facility #1 to be relocated. Increased peak flows in ditch along Carp Road due to reduced Time to Peak from landfill slopes. Loss of: o 7.4 ha of meadow communities o 6.0 ha of forest communities o 3.7 ha of wetland communities. This represents a total of 17.1 ha of vegetation to be removed. Loss of 2 area sensitive breeding bird territories. Potential for the increase of edge effects resulting in an increase in: o Invasive species; o Windthrow; o Soil compaction; o Root damage to trees. Leachate contamination within adjacent vegetation affecting growth of native species. Removal of 3.7 ha of amphibian habitat for species such as: green frog, grey tree frog, northern leopard frog, spring peeper, and American toad. Removal of 6.0 ha of habitat for observed area sensitive bird species such as black and white warbler, northern waterthrush, and American redstart. Disturbance to the active bank swallow colony. Disturbance to breeding birds and other wildlife through construction noise and vibration as well as landfill operation No mitigation measures are required beyond the implementation of an EMP that is appropriate to the landfill footprint option. A two stage Stormwater Management (SWM) facility to provide TSS removals and emergency leachate seep storage in Stage 1 and full runoff retention in Stage 2 using recharge to groundwater as a control mechanism (similar to SWM practice in existing landfill). Two stage SWM facility where Stage 2 retains entire post development runoff and discharges to groundwater. New two stage SWM facility to replace SWM facility #1. Two stage SWM facility where Stage 2 retains entire post development runoff and discharges to groundwater. Compensation for the loss of vegetation communities could occur elsewhere on site where there are areas that could be revegetated. A Compensation and Restoration Plan will be developed during detailed design to address the exact location of these areas. When possible, salvage plant material for restoration from areas where vegetation will be removed MNR should be contacted to confirm that the wetlands to be removed are not part of the PSW as there is potential for these areas to be complexed with the current wetland. Installation of protective fencing. Access restrictions/prohibition. Use of dust suppressants. Establish buffers between landfill and natural areas. A system to treat leachate will be developed in conjunction with the preferred landfill footprint during detailed design. A Compensation and Restoration Plan will be developed during detailed design to address the exact location of potential compensation areas. Amphibians should be salvaged and moved prior to removal of the amphibian breeding habitats Revegetation in adjacent areas could compensate for the loss of bird habitat. Removal of vegetation should occur outside of breeding bird season (May-July). Avoid activity in area of bank swallow colony during breeding Discharge to groundwater with no increase in TSS and related parameter concentrations. Reduced flow to South Branch of Huntley Creek. Minimal flow in connecting swale. No increase in flow along Carp Road west ditch. No effects from relocation of existing SWM facility #1. Reduced flow in South Branch of Huntley Creek ha of vegetation will be removed, and compensated for elsewhere. Reduced impacts resulting from increased edge effects. No leachate contamination of adjacent vegetation. Loss of 3.7 ha of amphibian habitat; however, this type of habitat does exist in other areas on-site and could be compensated for in these locations. Loss of 6.0 ha of habitat for area sensitive bird species, to be compensated for elsewhere within the site. Construction disturbance to breeding birds and wildlife minimized through the establishment of vegetated buffers. 7

9 Alternative Landfill Footprint Option #2 Aquatic Archaeology & Cultural Heritage Transportation Land Use Aquatic ecosystems Cultural and heritage resources Archaeological resources Effects on airport operations Effects from truck transport along access roads Effects on current and planned future Predicted impact of project on vegetation and wildlife including rare, threatened or endangered species. Predicted changes in water quality. Predicted impact on aquatic habitat due to project. 8 No rare, threatened or endangered species were observed within the area. There are no permanent or intermittent streams located within There are no permanent or intermittent streams located within Predicted impact on aquatic biota due to project. There are no permanent or intermittent streams located within Cultural and heritage resources on-site and in vicinity and predicted impacts on them. Presence of archaeological resources on-site. Significance of on-site archaeology resources potentially displaced/disturbed. Potential to impact one Cultural Landscape Unit and one Built Heritage Feature: o Disturbance to a farmhouse on Carp Road, to the northeast of the footprint; and o Disturbance to a house on Carp Road, to the northeast of the There is potential for archaeological sites in three locales. One at the east (southeast) corner where a small remnant of the historical agricultural landscape survives between residential properties and the existing WM facility entrance. The second is in the west corner of the area where there is a low knoll beyond the low area near the road (Plate 2). The third is the woodlot in the south corner of the expansion area (west corner of the existing property). The Ministry of Culture has stated the site has low archaeological potential. Bird strike hazard to aircraft in Local Study Area. Potential for bird strikes (mainly gulls) at Carp airport due to local gull movements and aircraft flight patterns. Potential for traffic collisions. Disturbance to traffic Proposed road improvement requirements. Current land use. More conflicts between left turning trucks and through traffic on Carp Road. Truck traffic volumes will be similar to those during previous operations; however, the volume of through traffic will increase.. Increased delay for northbound traffic on Carp Road due to left turning trucks waiting in the roadway to complete their turn. Truck traffic volumes will be similar to those during previous operations; however, the volume of through traffic will increase. Proposed northbound left turn lane will add a minor amount of paved surface with minimal effect on runoff, maintenance and related activities. Other improvements on Carp Road by the MTO and the City of Ottawa are planned to address traffic operations issues resulting from non-site-related traffic at locations adjacent to the Site. Official Plan designation is Carp Road Corridor Rural Employment Area and Sand and Gravel Resource Area. season Establish buffers between landfill and natural areas; and Install appropriate native planting within buffers. Proposed alterations within the study area will be suitably planned in a manner that avoids any identified, above ground, cultural heritage resource, where possible. Cultural heritage value / significance of displaced or disrupted built heritage resources will be evaluated. Relocate the resource if significant. Supply evaluation report to the local municipal heritage committee. Where resources are disrupted by visual, audible or atmospheric conditions vegetative screening should be considered. Conduct a Stage 2 archaeological assessment within all undeveloped lands in the selected area of construction impact in order to identify any archaeological remains that may be present in advance of any construction. Conduct a Stage 2 archaeological assessment within all undeveloped lands in the selected area of construction impact in order to identify any archaeological remains that may be present in advance of any construction. Continue existing gull management program, which includes harassment techniques (pyrotechnics, gas cannons) and lethal reinforcement. Prepare an Integrated Gull Management Plan, which includes passive and active deterrents. The site entrance location now meets warrants for a left turn lane northbound on Carp Road due to traffic volume. The site entrance location now meets warrants for a left turn lane northbound on Carp Road due to traffic volume. Design and construct road improvements in accordance with City policies, standards and practices. No rare, threatened or endangered species within the area. There are no permanent or intermittent streams located within There are no permanent or intermittent streams located within There are no permanent or intermittent streams located within Disturbance to one Cultural Landscape Unit and one Built Heritage Feature in the vicinity of the A completed documentation report for archival purposes will be prepared. Potential relocation of a significant built heritage resource will be considered. Potential adverse effects on potential archaeological resources would be avoided or mitigated. Potential adverse effects on potential archaeological resources would be avoided or mitigated. Bird strikes would be minimized from gulls originating from the WCEC. Improved safety in comparison with existing conditions with the separation of northbound through and left turning traffic. Improved operations for northbound through traffic in comparison with existing conditions. Minor temporary construction related effects. Current land uses removed and replaced with a waste management facility.

10 Alternative Landfill Footprint Option #2 Economic land uses Displacement of agricultural land Effects on the cost of services to customers Continued service to customers Economic benefit to local municipality Planned future land use. Type(s) and proximity of off-site recreational resources within 500 m of landfill footprint potentially affected. Type(s) and proximity of off-site sensitive land uses (i.e., dwellings, churches, cemeteries, parks) within 500 m of landfill footprint potentially affected. Current land use. Predicted impacts on surrounding agricultural Type(s) and proximity of agricultural operations (i.e., organic, cash crop, livestock) and intensive farm operations in surrounding area. Ratio of air space achieved to volume of soil to be excavated and area of cell base and leachate collection system to be constructed. Designated as Light Industrial Area, Heavy Industrial Area and Sand and Gravel Resource Area in the Carp Road Corridor Community Design Plan. Zoned as Rural Heavy Industrial and Mineral Extraction under Ottawa Comprehensive Zoning By-Law. Existing land uses include, Industrial, Wooded Area and Idle and Shrub Land. The Rural and Industrial uses would be discontinued; however the change in use is compatible with the planned Industrial Mitigation measures related to landfill operation may reduce uses in the Carp Road Corridor Community Design Plan. the extent of the Influence Area, as defined in the Official Plan, The Convenience Commercial uses planned at the thus excluding the Convenience Commercial node. intersection of Richardson Side Road and Carp Road could include some uses which might be considered sensitive (e.g. a restaurant). No off-site recreational resources within 500 m of the landfill Five residences are found within 500 m of the landfill Dairy farm loses all but 6.1 ha of cropland for production of feed for cattle. Loss of some Class 3 and 4 type agricultural capability soil. Change in Official Plan designation, which is currently identified as General Rural Area and Sand and Gravel Resource Area. No potential effects to other surrounding agricultural Measures will be put in place to manage nuisance related effects during construction and operation. Acquire dairy farm or dairy farm continues with new cropland elsewhere. BMPs will be implemented by WM to ensure nuisance related effects are mitigated in relation to surrounding agricultural Loss of Industrial, Wooded Area, and Idle and Shrub Lands. The Rural and Industrial uses would be discontinued; however the change in use is compatible with the planned Industrial uses in the Carp Road Corridor Community Design Plan. No off-site recreational resources within 500 m of the landfill Five residences are found within 500 m of the landfill Loss of dairy farm or farm continues with new cropland elsewhere. Loss of some Class 3 and 4 agricultural capability soil. Area is generally low agricultural capability soil, as evidenced by the General Rural Area designation. No impacts on surrounding agricultural None. Existing farm operations in the proximity to proposed landfill footprint will continue to operate. Ratio of airspace achieved to total amount of soil handled for option 2 is 6.5 mil m 3 to 1.8 mil m 3. Ratio of airspace achieved to total amount of soil handled is 6.5 mil m 3 to 1.8 mil m 3. Total optimized site capacity and site life. The total optimized site capacity is 6.5 mil m 3 over 10 years. A total optimized site capacity of 6.5 mil m 3 over 10 years. Employment at site (number and duration). Up to 75 new jobs in waste diversion, disposal and green energy facilities for the next ten years. Up to 75 new jobs in waste diversion, disposal and green energy facilities for the next ten years. Opportunities to provide products or services. Continue services to customers for waste disposal. Continue services to customers for waste disposal. Social Effects on Residential and Commercial Development Effects on Property Tax Revenue on the City of Ottawa Visual impact of the facility on surrounding areas Residential development plans. No impact on residential development plans. No impact on residential development plans. Commercial development plans. No impact on commercial development plans. No impact on commercial development plans. City of Ottawa. Transition from agricultural to industrial property tax rate. Transition from agricultural to industrial property tax rate. Municipal Property Assessment Corporation (MPAC). Predicted changes in perceptions of landscapes and views. Transition from agricultural to industrial property tax rate. Transition from agricultural to industrial property tax rate. Visible from rural residential areas to the immediate west along small sections of William Mooney Road and Richardson Side Road. Visible from small section of Carp Road immediately east of site No visibility issues along the north, south edges and along most of the west and east edges due to existing vegetation Berm/vegetation buffer treatment to be installed along the north edge of the Short lengths of berm/ vegetation buffer treatment to be installed along west and east edges of footprint to create visual screen from residential area and roadway. Possibly require high berm to aid with screening due to higher proposed elevation of landfill parcel. Installation of visual screening elements would obscure views of the facility from surrounding areas. 9

11 Alternative Landfill Footprint Option #2 and existing topography. Aboriginal Site Design & Operations Local residents Number of residences. 5 residences within 500 m of the landfill Approximately 6,100 residences within 3 km of the site perimeter. Recreational facilities Potential effects on Aboriginal communities Site design and operations characteristics Type(s) and proximity of off-site recreational resources within 500 m of landfill footprint potentially affected. Potential effects on use of lands for traditional purposes. Complexity of site infrastructure. No recreational facilities within 500 m of potential landfill Initial information from Aboriginal groups and the Ministry of Aboriginal Affairs and INAC indicates that WM property, upon which this alternative is proposed, is not subject to any current land claims. Site will require leachate, gas, and storm water (SW) controls. Leachate generation rate for closed footprint estimated to be between 1.7 to 2.7 L/s. Measures will be put in place to manage nuisance related effects during construction and operation. Consultation with Aboriginal groups will continue throughout the EA process. No mitigation required. Need for leachate, gas, and SW control is dictated by O. Reg 232/98. No mitigation required. All leachate generated will need to be treated. Leachate generation rate is influenced by factors including footprint size, final contours, and the design and maintenance of the final cover. Desirable to minimize longterm leachate generation rate. 5 residences within 500 m of the landfill Approximately 6,100 residences within 3 km of the site perimeter. No recreational facilities within 500 m of potential landfill No effects on Aboriginal communities. Site design will incorporate leachate, gas, and SW controls in accordance with O.Reg 232/98. Leachate generation rate for closed footprint estimated to be between 1.7 to 2.7 L/s. Base grading design would require one low point/ leachate pumping station. No mitigation required. Number of low points/ pumping stations is largely dictated by grading design. Key constraints in developing grading design are to balance cut/fill requirements while maintaining the base of the liner system above the shallow ground water table. Base grading design would likely require one low point/ leachate pumping station. All leachate collection system (LCS) cleanouts can be located around perimeter of site. No mitigation required. LCS cleanouts are required and location of cleanouts is dictated by footprint size/shape. Desirable to minimize need for cleanouts in centre of site. All LCS cleanouts can be located around perimeter of site. Site will likely require design and construction of three Stormwater Management (SWM) ponds (including replacement of SWM pond for existing landfill which is displaced by new footprint). No mitigation required. Number of SWM ponds dictated by footprint size/shape relative to existing topography. Typical objectives of SWM design include maintaining gravity drainage to minimize need for active pumping. Site will likely require design and construction of three SWM ponds. Distance from leachate pumping station to existing leachate treatment facilities at SE of existing landfill is approx. 1350m. No mitigation required. Footprint alternative is expected to utilize existing facilities at SE of existing landfill, necessitating construction of pipelines. Longest leachate forcemain length is approx. 1350m. Distance from farthest point of footprint to existing gas management facilities at SE of existing landfill is approx. 2200m. No mitigation required. Footprint alternative is expected to utilize existing facilities at SE of existing landfill, necessitating construction of pipelines. Longest gas forcemain length is approx. 2200m. Operational flexibility. 10 Minimum haul road length to reach footprint from Carp Road is 330 m. Landfill footprint does not encroach on William Mooney Road precluding need for road closure and acquisition by WM. Requires importation of approximately 1,376,000 m 3 of soil and granular material for base liner, LCS, and final cover construction. Requires importation of approximately 148,000 m3 for base grading earthworks. Base grading design with one low point would require temporary leachate collection measures if filling to start anywhere but at the low point. No mitigation required. Entrance from Carp Road is only reasonable alternative. No mitigation required. No mitigation required. Material requirements for base liner, LCS, and final cover are dictated by footprint size as well as design requirements identified in O. Reg. 232/98. No mitigation required. Volume of imported fill is dictated by base grading design, site topography, and resultant cut/fill balance. No mitigation required. Number of LCS low points/ pumping stations is dictated by grading design. It is preferable to start filling at the low point of the landfill to minimize need for temporary leachate collection measures. Minimum haul road length to reach footprint from Carp Road is 330 m. Landfill footprint does not encroach on William Mooney Road precluding need for road closure and acquisition by WM. Requires importation of approximately 1,376,000 m 3 of soil and granular material for base liner, lcs, and final cover construction. Requires importation of approximately 148,000 m 3 for base grading earthworks. Base grading design with one low point requires temporary leachate collection measures if filling to start anywhere but at the low point.