1.0 SUMMARY OF PHASE I ESA, PHASE II ESA, PHASE ONE ESA, AND SUPPLEMENTAL PHASE TWO ESA REPORTS

Transcription

1 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 APPENDIX D SUMMARY OF PHASE I AND PHASE II ESAs AND ADDITIONAL RELEVANT INFORMATION 1.0 SUMMARY OF PHASE I ESA, PHASE II ESA, PHASE ONE ESA, AND SUPPLEMENTAL PHASE TWO ESA REPORTS As identified in Appendix C, AMEC completed a Phase I ESA (AMEC, 2010a), Phase II ESA (AMEC, 2010b), Phase One ESA (AMEC, 2012a) and Supplemental Phase Two ESA (AMEC, 2012b) at the Site. The Phase One ESA (AMEC, 2012a) was undertaken as an update of the Phase I ESA (AMEC, 2010a) to meet the Phase One ESA reporting requirements under Ontario Regulation 153/04 ( O. Reg. 153/04 ), as amended. The Supplemental Phase Two ESA (AMEC, 2012b) was undertaken to: (i) further assess areas of potential environmental concern identified in the Phase One ESA (AMEC, 2012a) and in the Phase II ESA (AMEC, 2010b); (ii) to address comments made by the Ministry of the Environment (MOE) on the work undertaken previously and further work as recommended by XCG Environmental Engineers & Scientists ( XCG ), a consultant working on behalf of a local public interest group; and (iii) to provide a Phase Two ESA report compliant with the requirements of O. Reg. 153/04, as amended. The Supplemental Phase Two ESA was amended to include additional investigations undertaken to address comments provided by the MOE in its review of the Phase One ESA, Phase Two ESA, Pre-submission Form (PSF) and RA Report. Copies of these reports are provided electronically and summarized below. In the context of this discussion, the Site, represents the entire Lansdowne Park and Sylvia Holden Commemorative Park property and the RA property represents the parcel of land being addressed within this RA. The information has been presented in this manner as the soil from the Site will be placed within a berm on the RA property. As such, soil data from the Site is relevant in the context of assessing risks at the RA property. All soil data considered in the conduct of the risk assessment is summarized in the following tables: Table 1: Summary of Petroleum Hydrocarbons Soil Analyses Table 2: Summary of Polynuclear Aromatic Hydrocarbons Soil Analyses Table 3: Summary of Metal and Inorganics Soil Analyses Table 4: Summary of Volatile Organic Compounds Soil Analyses Table 5: Summary of Polychlorinated Biphenyls Soil Analyses Table 6: Summary of Dioxins and Furans Soil Analyses Table 7: Summary of Fraction Organic Carbon Soil Analyses Page 1 of 52

2 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 The groundwater data from the RA RSC Property is provided in the following tables: Table 8: Summary of Petroleum Hydrocarbon Ground Water Analyses Table 9: Summary of Polynuclear Aromatic Hydrocarbon Ground Water Analyses Table 10: Summary of Heavy Metals Ground Water Analyses Table 11: Summary of Volatile Organic Compounds Ground Water Analyses Table 12: Summary of Polychlorinated Biphenyls Ground Water Analyses Table 13: Summary of General Chemistry Ground Water Analyses Numerous historical reports have been prepared in reference to the Site by others dating back to Summaries of these reports have been provided in the Phase I ESA (AMEC, 2010a) and Phase One ESA (AMEC, 2012a). These reports include: Commerce Building, Lansdowne Park, Soils Investigation, Ottawa, Ontario, Intera Information Technologies (Canada) Ltd. (Intera), September 30, 1993 (Intera, 1993); East Lavatory and Boiler Plant Soil Excavations, Lansdowne Park, Ottawa, Ontario, Intera Information Technologies (Canada) Ltd. (Intera), March 31, 1994 (Intera, 1994); Phase I Environmental Site Assessment, Lansdowne Park, 945 to 1015 Bank Street, Ottawa, Ontario, John D. Paterson and Associates Limited, February 6, 1998 (Paterson, 1998a); Limited Phase II Environmental Site Assessment, Lansdowne Park, Bank Street, Ottawa, Ontario, John D. Paterson and Associates Limited, August 28, 1998 (Paterson, 1998b); Environmental Site Characterization, Lansdowne Park, Bank Street, Ottawa, Ontario, John D. Paterson and Associates Limited, January 11, 1999 (Paterson, 1999a); Environmental Building Assessment, Coliseum Building, Lansdowne Park, Ottawa, Ontario, John D. Paterson and Associates Limited, January 11, 1999 (Paterson, 1999b); Environmental Building Assessment, Horticulture Building, Lansdowne Park, Ottawa, Ontario, John D. Paterson and Associates Limited, January 11, 1999 (Paterson, 1999c); Environmental Building Survey, Civic Centre and Frank Clair Stadium, Lansdowne Park, Ottawa, Ontario, John D. Paterson and Associates Limited, January 11, 1999 (Paterson, 1999d); Summary of Known Environmental Conditions (Specific to Contaminated Lands Issues), Lansdowne Park, Ottawa, Ontario, Golder Associates Ltd., February 1, 2008 (Golder, 2008); Old Landfill Management Data Gap Analysis, Lansdowne Park (Ur-27), Bank Street, Ottawa, Ontario, John D. Paterson and Associates Limited, November 10, 2003 (Paterson, 2003); Page 2 of 52

3 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 Preliminary Geotechnical Investigation, Proposed Lansdowne Park Redevelopment, Bank Street at Holmwood Avenue, Ottawa, Ontario, Paterson Group, March 17, 2010 (Paterson 2010a); and, Geotechnical Investigation, Proposed Stormwater Management System, Lansdowne Park, Ottawa, Ontario, Paterson Group, September 27, 2010 (Paterson 2010b). It should be noted that the building referred to as the Commerce Building by Intera (1993) is identified as the Horticultural Building throughout the discussions provided by AMEC. To support the discussion of the environmental investigations below, please note that: A composite site plan and aerial image of the Site is provided on Figure 2; Areas of potential environmental concern (as per the Phase One ESA (2012a)) are depicted on Figure 5; Potentially contaminating activities are depicted on Figure 6; The proposed development plan for the Site is provided on Figure 7. The location of boreholes, monitoring wells and testpits are identified on Figure 8; Cross-sections depicting the soil stratigraphy are provided on Figures 9A to 9H. The locations of the cross sections are shown on Figure 9; Ground water elevation contour and flow directions are provided on Figures 10A to 10D; The location of soil Table 3 SCS exceedances in plan view are provided in Figures 11A through 11C; The locations of soil Table 3 SCS exceedances in cross section are depicted on Figure 12A through 12G; The location of ground water Table 3 SCS exceedances in plan view are provided on Figure 13; The locations of ground water Table 3 SCS exceedances in cross section are depicted on Figure 14A through 14G; The inferred extent of waste and construction / demolition fill areas is shown on Figure 15; Inferred Areas of Table 3 SCS Exceedances are shown on Figure 16; and The Phase II Conceptual Site Model in plan view is provided on Figure Phase I ESA (AMEC, 2010a) The Phase I ESA completed by AMEC in March 2010 identified several Areas of (actual) Environmental Concern (AECs) and Areas of Potential Environmental Concern (APECs) that have previously impacted, or may be impacting soil and ground water quality at the Site. AECs Page 3 of 52

4 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 were primarily realized through previous subsurface investigations and sampling programs completed at the Site by others on behalf of the City. The AECs identified at the Site included: Remnant subsurface heating oil impact in the vicinity of the former Coliseum Annex (AEC 1) boiler rooms (identified as APEC-1 in Phase One ESA (AMEC 2012a)); Remnant subsurface heating oil impact in the vicinity of the former East Lavatory (AEC 2) boiler room (identified as APEC-2 in Phase One ESA (AMEC 2012a)); The Eastern Landfill (Ur-27) beneath the eastern portion of the Site (AEC 3) (identified as APEC-3 in Phase One ESA (AMEC 2012a)); The suspected southern landfill in the vicinity of the South Side Stands (AEC 4) (identified as APEC-4 in Phase One ESA (AMEC 2012a)); and, Ammonia impact in the vicinity of the Horticultural Building associated with former indoor ice making activities (AEC 5) (identified as APEC-5 in Phase One ESA (AMEC 2012a)). In addition to these AECs, several APECs were also identified at the Site (Figure 6). These included several previously identified concerns that had either not been assessed during previous subsurface investigations completed at the Site, or were, in AMEC s opinion, not subject to a sufficient level of investigation to dismiss them as an APEC. The APECs identified at the Site include: Potential soil and/or ground water impact from a historic gasoline service station and historic dry cleaning facility formerly located at 1014/1016 Bank Street, approximately 23 metres west of the Site at the northeast corner of the intersection of Bank Street and Wilton Avenue (APEC 1) (identified as APEC-6 in Phase One ESA (AMEC 2012a)); Potential soil and/or ground water impact from historic gasoline service stations, historic automotive repair shops and historic dry cleaning facilities formerly located along Bank Street, including a historic gasoline service station located approximately 25 metres northwest of the Site at 912 Bank Street (APEC 2) (identified as APEC-7 in Phase One ESA (AMEC 2012a)); Potential soil and/or ground water impact from a historic transformer, potentially containing oil with polychlorinated biphenyls (PCB) additives, located north of the Coliseum Building near the west end of the former Coliseum Annex (APEC 3) (identified as APEC-8 in Phase One ESA (AMEC 2012a)); Potential soil and/or ground water impact from the transformer vault and boiler room and potential unknown fuel sources at the southeast corner of the former McElroy Building (APEC 4) (identified as APEC-9 in Phase One ESA (AMEC 2012a)); Potential soil and/or ground water impact associated with historic fuel sources and storage methods for the Horticultural Building heating equipment (APEC 5) (identified as APEC-10 in Phase One ESA (AMEC 2012a)); Potential soil and/or ground water impact associated with a former gasoline and oil storage area located near the former General Purpose Building during occupation by the Page 4 of 52

5 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 Military from 1941 through to 1946 (APEC 6) (identified as APEC-11 in Phase One ESA (AMEC 2012a)); Potential soil and/or ground water impact from the boiler house for the former Machinery Hall Building located just east of the Site on NCC Lands (APEC 7) (identified as APEC- 12 in Phase One ESA (AMEC 2012a)); Potential soil and/or ground water impact associated with oil observed in the Civic Centre elevator sump pit during a previous Phase I ESA of the Site (APEC 8) (subsequently not identified as an APEC in Phase One ESA (AMEC 2012a); Potential soil and/or groundwater impact associated with oil observed in the Civic Centre sanitary sump pit during a previous Phase I ESA of the Site (APEC 9) (subsequently not identified as an APEC in Phase One ESA (AMEC 2012a); Potential soil and/or ground water impact by ammonia in the vicinity of the Civic Centre ice making equipment (APEC 10) (identified as APEC-13 in Phase One ESA (AMEC 2012a)); Potential hydraulic oil leaks and subsurface soil and/or ground water impact at the piston elevator shaft and sump pit in the Eddie Friel Building (APEC 11) (subsequently not identified as an APEC in Phase One ESA (AMEC 2012a); and, Unknown material types and quality associated with fill that has been placed across the Site (APEC 12) (identified as APEC-15 in Phase One ESA (AMEC 2012a)). Note that the list does not currently include APEC 14, identified as former ice making plants at the former McElroy Building and Curl-o-Drome, which was identified during the Phase One ESA (AMEC, 2012a), and is discussed further in Section 1.3. Based on the results of the Phase I ESA (AMEC, 2010a), a Phase II ESA was recommended. 1.2 Phase II ESA (AMEC, 2010b) AMEC completed a Phase II ESA in accordance with O. Reg. 153/04 and the final report was issued in June 2010 (AMEC, 2010b) Field Investigations The Phase II ESA was carried out in two stages. The initial stage of the work program included the advancement of 37 boreholes, 29 of which were instrumented with ground water monitoring wells. These test locations were strategically selected to assess the AECs and APECs identified in the Phase I ESA (AMEC, 2010a) save and except those associated with the elevator and storm sewer sumps. In the second stage, an additional 27 boreholes were advanced in the vicinities of the Coliseum Building, former Coliseum Annex, Horticultural Building and former East Lavatory to further define the extent of polynuclear aromatic hydrocarbon (PAH) impact in shallow soil (fill) and to delineate the extent of construction rubble and debris likely associated with the previous demolition of several former on-site structures Page 5 of 52

6 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 (i.e., Coliseum Annex, East and West Lavatories). Ground water monitoring and sampling events were carried out following the Stage I drilling program. Confirmatory ground water sampling was carried out upon completion of the Stage II drilling program. The boreholes and monitoring wells put down at the Site were located to address the contaminants of potential concern (COPCs) outlined in the Phase I ESA. The sample collection and analysis at each borehole and monitoring corresponded to the issue of environmental concern identified in the Phase I ESA at that location. It should be noted that while the majority of the boreholes/monitoring wells were put down to assess specific targets, many of these test locations were also utilized to assess fill materials present across the Site. Similarly, several of the monitoring wells advanced at the site were put down to assess general ground water flow and quality conditions beneath the Site. Similarly many of the monitoring wells installed at the Site were sampled for volatile organic compounds (VOC) despite the absence of any related AECs/APECs beyond the potential off-site concerns north/northwest of the Site. Through the Phase II ESA investigations a total of 107 soil samples and 60 ground water samples, exclusive of quality assurance/quality control (QA/QC) samples, were submitted for chemical analyses of various COPCs including petroleum hydrocarbons (PHC), VOC, PAH, metals and PCB and select general chemistry parameters (electrical conductivity, SAR, cyanide, ammonia, nitrate/nitrite, chloride, sodium). Thirty-eight (38) soil samples were submitted for ph determination. A justification for the Phase II ESA sampling plan is provided in Table D1. Page 6 of 52

7 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 Table D1: Justification for Phase II ESA Sampling Program AEC/APEC Borehole / Monitoring Well Rationale Soil Analyses Water Analyses AEC 1: Former Coliseum Annex boiler rooms (APEC-1 as per AMEC 2012a) AEC 2: East Lavatory (Horticultural Building) boiler room (APEC-2 as per AMEC 2012a) AEC 3: Eastern Landfill (Ur-27) (APEC-3 as per AMEC 2012a) AEC 4: Suspected southern landfill (APEC-4 as per AMEC 2012a) AEC 5: Horticultural Building (Ammonia Impact) (APEC-5 as per AMEC 2012a) APEC 1: Historic gasoline service station and dry cleaning operation at 1014/1016 Bank Street (APEC-6 as per AMEC 2012a) APEC 2: Historic gasoline service station at 912 Bank Street and additional upgradient BH10-6, BH10-8, MW10-3, MW10-21 and MW10-24 BH10-7, MW10-1, MW10-15 and MW10-20 BH10-3, BH10-4, BH10-5, MW10-10, MW10-11, MW10-12, MW10-13, MW10-16, MW10-18 and MW10-29 BH10-1, BH10-2, MW10-5 MW10-8, and MW10-9 MW10-22 and MW10-25 MW10-4 and MW10-26 MW10-7, MW10-14 and MW10-23 Stage I Investigation To assess potential remnant soil and ground water impacts with respect to historical heating oil related impacts previously identified in this area and potential impacts associated with the historic use of coal. To assess the potential for remnant soil and ground water impacts with respect to historical heating oil related impacts previously identified in this area. To assess the potential for soil and ground water impacts with respect to the former landfill. To assess the potential for soil and ground water impacts with respect to the suspected former landfill. To assess the potential for ground water impacts associated with the former ice making plant. To assess the potential for ground water impacts associated with the former off-site activities at this location. To assess the potential for ground water impacts associated with the former off-site activities at this location. BTEX, PHC F1-F4, PAH, Metals, ph BTEX. PHC F1-F4, PAH, Metals, ph BTEX. PHC F1-F4, PAH, Metals, ph BTEX. PHC F1-F4, PAH, Metals, ph BTEX, PHC F1-F4, PAH, Metals and Inorganics, ph BTEX, PHC F1-F4, PAH, Metals, ph BTEX, PHC F1-F4, PAH, Metals, ph VOC, PHC F1-F4, PAH VOC, PHC F1-F4, ammonia, cyanide, nitrate, nitrite VOC, PHC F1-F4, PAH, Metals, PCB VOC, PHC F1-F4, PAH, Metals VOC, PHC F1-F4, PAH, ammonia, chloride, cyanide, nitrate, nitrite, sodium VOC, PHC F1-F4 VOC, PHC F1-F4, PCB Page 7 of 52

8 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 AEC/APEC Borehole / Monitoring Well Rationale Soil Analyses Water Analyses dry cleaning operations (APEC-7 as per AMEC 2012a) APEC 3: Historic transformer (north of Coliseum) (APEC-8 as per AMEC 2012a) APEC 4: Former transformer vault and boiler room (McElroy building) (APEC-9 as per AMEC 2012a) APEC 5: Horticultural Building (heating equipment) (APEC-10 as per AMEC 2012a) APEC 6: Former gasoline and oil storage area (south General Purpose Building) (APEC-11 as per AMEC 2012a) APEC 7: Machinery Hall Building Boiler House (off-site NCC lands) (APEC-12 as per AMEC 2012a) APEC 9: Civic Centre ice making plant (APEC-13 as per AMEC 2012a) APEC 11: Eddie Friel Building (piston elevator shaft and sump pit) MW10-14 MW10-11, MW10-17 and MW10-28 MW10-22 and MW10-25 MW10-28 MW10-16 MW10-27 MW10-8 To assess the potential for soil and ground water impacts associated with this former oil-filled transformer. To assess the potential for soil and ground water impacts with respect to the former activities at these locations. To assess the potential for soil and ground water impacts associated with historic fuel sources and storage methods. To assess the potential for soil and ground water impacts associated with historic fuel sources and storage methods. To assess the potential for ground water impacts associated historic sources and storage methods. To assess the potential for ground water impacts associated with the former ice making plant. To assess the potential for soil and ground water impacts associated with leaking hydraulic oil from this location. BTEX, PHC F1-F4, PAH, Metals, ph BTEX, PHC F1-F4, PAH, Metals BTEX, PHC F1-F4, PAH, Metals and Inorganics, ph BTEX, PHC F1-F4 BTEX, PHC F1-F4, PAH, Metals, ph Metals BTEX, PHC F1-F4 VOC, PHC F1-F4, PCB VOC, PHC F1-F4, PAH, PCB, ammonia, chloride, cyanide, nitrate, nitrite, sodium VOC, PHC F1-F4, PAH, ammonia, chloride, cyanide, nitrate, nitrite, sodium VOC, PHC F1-F4, PCB, ammonia, cyanide, nitrate, nitrite VOC, PHC F1-F4, PAH, VOC, PHC F1-F4, ammonia, cyanide, nitrate, nitrite VOC, PHC F1-F4, PAH, Metals Page 8 of 52

9 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 AEC/APEC Borehole / Monitoring Well Rationale Soil Analyses Water Analyses APEC 12: General geological/hydrogeologi cal and fill conditions (unknown materials and quality across Site) (APEC-15 as per AMEC 2012a) AEC 1: Former Coliseum Annex boiler rooms (APEC-1 as per AMEC 2012a) AEC 2: East Lavatory (Horticultural Building) boiler room (APEC-2 as per AMEC 2012a) APEC 5: Horticultural Building (APEC-10 as per AMEC 2012a) APEC 5: MW10-25 (west of Horticultural Building) (APEC-10 as per AMEC 2012a) MW10-2, MW10-6, MW10-18, MW10-19, MW10-29 BH10-20, BH10-21, BH10-22, BH10-23, BH10-24, BH10-25, BH10-26, BH10-27, BH10-28, BH10-29, BH10-30, BH10-31 and BH10-32 BH10-9, BH10-10, BH10-11, BH10-33, BH10-34 and BH10-35 BH10-12, BH10-13, BH10-14, BH10-15 and BH10-16 BH10-16, BH10-17, BH10-18 and BH10-19 To assess general ground water characteristics and quality in areas interstitial to AECs/APECs. Stage II Investigation BTEX, PHC F1-F4, PAH, Metals, ph VOC, PHC F1-F4, PAH, Metals, ammonia, cyanide, nitrate, nitrite To delineate the extent of construction/demolition rubble and debris and the extent of PAH impact in surface soil and to in the vicinity of the former Coliseum Annex. PAH, Metals NA To further assess potential PAH impact and to delineate the extent of construction/demolition rubble and debris. To delineate the extent of PAH impact in surface soil at the front of the building. To more accurately determine the ph in surface soil and to facilitate sample averaging as necessary and delineate the extent of PAH impact in surface soil at the front of the Horticultural Building. PAH, Metals PAH, Metals, ph PAH, ph NA NA NA Page 9 of 52

10 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 In accordance with O.Reg. 153/04, the appropriate generic Site Condition Standards (SCS) were the Table 3 SCS for non-potable ground water and coarse textured soils. Owing to the proposed redevelopment of the Site considered to include mixed residential and commercial uses (at the time of the Phase II ESA), laboratory analytical data was evaluated though comparison with SCS for both residential/parkland/institutional (R/P/I) and industrial/ commercial/community use (I/C/C) property use standards. It should be noted that analytical data provided in the 2010 Phase II ESA report were primarily evaluated through comparison with the 2004 Table 3 SCS. This was due to several factors including: 1) an opinion by the City of Ottawa that the proposed future parkland land use on the eastern and southern portions of the Site was consistent with the current use of the Site and thus would not result in a change of land use requiring the filing of a Record of Site Condition; and 2) the fact that the City of Ottawa had filed a Notice of Transition to allow use of the 2004 Table 3 SCS for that portion of the Site to be redeveloped to residential property use along the north and west portions of the Site Subsurface Conditions The subsurface conditions at the Site were generally found to consist of surficial fill comprised of various geologic materials (silty sand, gravel, sandy silt and sandy clayey silt) and waste debris (e.g., brick, organics, glass, metal, wood, ash, cinders, coal, etc.) overlying native deposits consisting primarily of loamy sand and gravelly loamy sand with lesser deposits of sandy loam, gravely sand, sand and silt. Grain size distribution analyses completed on 10 soil samples indicated that the subsurface soil across the Site is considered coarse textured for the purposes of assessment. Fill material placed across the Site varies in thickness from 0.5 metres (at the southwest corner of the Site) to a maximum of 5.2 metres (MW-2, located between the Civic Centre and the Aberdeen Pavilion). Waste materials including wood, metal, ashes, cinders, coal, brick and decayed organic matter were identified within the fill material in the area of the former Eastern Landfill (Ur-27) to a maximum depth of 5.5 metres below grade. The configuration of the Eastern Landfill (Ur-27) is roughly coincident with a portion of the former inlet from the Rideau Canal and is estimated to occupy an area of approximately 20,700 m 2 The depth of the fill material in the area of the suspected southern landfill ranged between 0.7 and 1.5 metres in thickness. It is noted that no waste material was identified in any of the boreholes advanced in this area; however, construction/demolition type rubble (e.g., concrete, bricks and glass) was identified at one borehole location. Similar construction and/or demolition materials were identified in the vicinity of the former East Lavatory and Coliseum Annex occupying estimated areas of 1,900 m 2 and 8400 m 2, respectively. No free phase liquid petroleum hydrocarbon (LPH), significant odours, or staining were observed in any of the soil samples collected from the boreholes advanced at the Site. Combustible organic vapour (COV) and total organic vapour (TOV) measurements recorded in the soil samples were generally low (in the ppm range) with the exception of four (4) samples: BH10-2; BH10-6; MW10-15; and MW10-21, where slightly elevated COV were noted. These headspace concentrations are not considered to be indicative of significant impact by petroleum hydrocarbons or other organic contaminants and were confirmed through subsequent laboratory Page 10 of 52

11 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 analyses for all samples (except MW10-21 which yielded insufficient sample quantity to facilitate laboratory analysis). The results of the ground water monitoring indicated that the primary near surface water table resides in the loamy sand and gravely loamy sand; however, ground water was identified at shallower depths, within the fill and waste material, beneath the northeast portion of the Site and in the vicinity of the former Eastern Landfill (Ur-27). Based on the limited overburden ground water elevations, the ground water flow in the western portion of the Site appeared to flow to the southeast. The ground water flow in the eastern portion of the Site was affected by the presence of the Eastern Landfill (Ur-27) and flowed approximately radially outward to the west and south from the landfill. Measurable LPH accumulations were not observed in any of the monitoring wells installed at the Site. No hydrocarbon odour, hydrocarbon sheen or iridescence, or other visual or olfactory indication of negative impact were observed in any of the ground water samples collected at the Site except MW10-7 where a slight hydrocarbon sheen was observed during the initial ground water sampling event Soil Quality Soil impacts in excess of the 2011 Table 3 SCS indicated exceedances for one or more PAH parameters for R/P/I property use at 17 borehole locations. The majority of the impacts occur within the Eastern Landfill (Ur-27) and in the vicinities of the Horticultural Building and former Coliseum Annex. At the Eastern Landfill (Ur-27) impacts occur in the landfilled waste and/or overlying fill materials and can be attributed to the quality of the waste/fill materials placed in this area. Beyond the Eastern Landfill (Ur-27), PAH impacts exceeding 2011 Table 3 SCS for R/P/I property use were identified in shallow soils at 15 borehole locations in the vicinities of the Horticultural Building and former Coliseum Annex. Both the Horticultural Building and Coliseum Annex were initially heated by coal. As such, the PAH impacts, were attributed to the former use and management of coal and/or coal residues at these locations. The concentrations of one or more heavy metals including arsenic, lead, mercury, selenium and zinc were found to be in excess of Table 3 SCS for R/P/I property use in five (5) of the soil samples collected at four (4) borehole locations within the Eastern Landfill. One soil sample collected at BH10-26 in the vicinity of the Coliseum Annex exceeded the 2011 Table 3 SCS for R/P/I property use for lead. Soil ph values measured in soil samples collected from across the Site ranged from 7.02 to 9.63 with two samples, MW10-25 AS2 and BH10-19 AS1, reporting ph values of 9.63 and 9.33, respectively. These ph values fall outside the acceptable range of 5 9 for surface soil as required to allow use of the Table 3 SCS. Four additional soil samples collected from the same elevation and within a 2 metre radius of MW10-25 AS2 reported ph values of 7.97 (BH10-16 SS2), 8.25 (BH10-17 SS2), 7.29 (BH10-18 SS2) and 8.05 (BH10-19 SS2) which, together with sample MW10-25 AS2, yielded an average ph of 7.81 for sample location MW10-25 AS2. This ph values falls within the required range of 5 9. Page 11 of 52

12 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 Similarly, two additional soil samples collected from the same elevation and within a 2 metre radius of BH10-19 AS1 and two repeat analyses of BH10-19 AS1 reported ph values of (BH10-17 AS1), 9.08 (BH10-18 AS1), 9.21 (BH10-19 AS1 Repeat 1) and 9.26 (BH10-19 AS1 Repeat 2), which together with sample BH10-19 AS1, yield an average ph of 9.30 for sample location BH10-19 AS1. This ph values falls outside the required range of 5 9. Soil in the vicnity of BH10-19 will thus require removal from the Site during remedial operations and prior to the filing of a RSC. As such, a soil ph outside the range of 5 to 9 will not be present at the RA property Ground Water Quality Initial ground water sampling revealed impact by PHC at four monitoring well locations; however, re-sampling on two separate events reported PHC concentrations below Table 3 SCS at these locations. Ground water east of the Civic Centre Arena and south and north of the Aberdeen Pavilion has been mildly impacted by chloroform with reported concentrations having exceeded 2011 Table 3 SCS at 9 of the monitoring wells. The chloroform impacts were attributed to leaking municipal water supply infrastructure beneath the Site. Ground water samples submitted for laboratory analysis of general ground water chemistry parameters including one or more of nitrogen speciation (ammonia, nitrate and nitrite), sodium, cyanide and chloride all reported parameter concentrations below Table 3 SCS, where established. Ammonia was detected only at several sampling locations including MW10-1, MW10-2, MW10-11, MW10-12, MW10-17, MW10-22, MW10-25, MW10-27 and MW10-28 at concentrations ranging from 0.15 mg/l (MW10-11) to 2.13 mg/l (MW10-12) with a greater number of detections and higher concentrations occurring in the vicinity of the Eastern Landfill (Ur-27). Cyanide and nitrite were not detected in any of the samples submitted for analysis. Detectable concentrations of nitrate below the Table 2 SCS were reported in all samples analyzed for nitrate with concentrations ranging between 1.0 mg/l (MW10-22) and 5.7 mg/l (MW10-25) QA/QC A strict Quality Assurance/Quality Control (QA/QC) program was implemented and maintained throughout the Phase II ESA to ensure the Site data to be representative of the actual Site conditions. The QA/QC program provides a method of documented checks to assess the precision and accuracy of collected data. The QA/QC program includes a set of standard procedures or protocols to be followed throughout the investigations. AMEC field and QA/QC protocols have been developed to meet or exceed those defined in the MOE documents entitled Protocol for Analytical Methods Used in the Assessment of Properties under Part XV.1 of the Environmental Protection Act, March 9, 2004 (MOE, 2004), and Guidance on Sampling and Analytical Methods for Use at Contaminated Sites in Ontario (MOE, 1996). All sample containers and preservatives, where applicable, were supplied by the subcontract laboratory and were consistent with the specifications provided in MOE All samples were Page 12 of 52

13 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 placed on ice in coolers after collection to meet the storage requirements of MOE All samples were labelled with unique identifiers indicating the borehole/monitoring well of origin and depth interval (soil samples), with the exception of field duplicate samples that were labelled with aliases to prevent identification by the laboratory. All samples were transported by AMEC staff directly to the laboratory under continuous Chain of Custody documentation. Each Chain of Custody form had a unique serial number. The analytical laboratories (Caduceon and Paracel) employed to perform the laboratory analyses are accredited by the Canadian Association for Laboratory Accreditation Inc. (CALA) in accordance with ISO/IEC 17025:1999 General Requirements for the Competence of Testing and Calibration Laboratories for the tested parameters set out in the Soil, Ground Water and Sediment Standards. It is noted that Paracel is not accredited by CALA for cis-1,2- dichloroethylene in ground water. Blind duplicate samples were submitted for analysis at the rate of approximately one for every ten real samples for all tested parameters in soil and ground water with the exception of VOC in soil (only a single sample was submitted for VOC analysis). The QA/QC program for this investigation included the collection and analysis of: Four (4) blind duplicate soil samples for BTEX/PHC F1-F4; Two (2) blind duplicate soil samples for PAH; Four (4) blind duplicate soil samples for Metals; Four (4) blind duplicate ground water samples for VOC; Two (7) blind duplicate ground water samples for BTEX/PHC F1-F4; One (1) blind duplicate ground water sample for PAH; One (2) blind duplicate ground water sample for Metals; One (1) blind duplicate ground water sample for general chemistry parameters; and, One (1) blind duplicate ground water sample for PCB. The results of the field duplicate sample analyses indicate that the sampling results were generally reproducible with relative percent differences (RPD) for the primary and duplicate samples reporting within acceptable ranges. Exceptions of several instances of poor correlation with metals in soil/fill samples were as follows: The duplicate soil sample pair collected at borehole MW10-18 AS2 reported RPDs of 50%, 43.1% and 48.5% for copper, mercury and zinc, respectively, all of which exceed the recommended limit of 35% for metals in soil duplicates. The data was accepted based on all other metals from that sample analysis reporting within the required RPD; and, The primary and blind duplicate ground water sample pair collected at monitoring well MW10-19 on March 24, 2010 reported an RPD of 49% for cobalt which exceeds the recommended limit of 25% for metals in ground water duplicates. The data was accepted based on reported concentrations less than and marginally above 5 times the Page 13 of 52

14 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 MDL (1 µg/l) and all other metals from that sample analysis reporting within the required RPD. In regards to the soil and ground water duplicates for metals analyses noted above, all samples were also reported at concentrations well below the applicable EPA Table 3 SCS and were therefore considered inconsequential. Three (3) trip (travel) blank samples were also prepared for VOC analyses during the June 2010 confirmatory ground water sampling event. There were no issues with any travel blanks that were shipped in any cooler containing ground water samples analyzed for VOC. All samples/sample extracts were analyzed within their applicable hold times using approved analytical methods. The relative percent differences (RPD) for corresponding data sets were met for all tested parameters with the following exceptions: Soil samples BH10-4 SS6 for PHC-F2; BH10-5 SS5 for PHC-F2; MW10-21 SS7 for PHC-F2; and ground water sample MW-12 for benzo(k)flouranthene. The raised detection limit were well below EPA Table 3 SCS thus there is no material effect on the quality of the data; and Ground water sample MW10-9 collected on May 27, 2010 reported an MDL of 50 µg/l for chromium (vi). The increased MDL is due to the laboratory reporting the total chromium value for chromium (vi) due to unknown error which resulted in an initial chromium (vi) concentration of 494 µg/l. The reported chromium (vi) value of 494 µg/l was considered to be incorrect based on the results of the initial sampling events and the results of the total chromium analyses from both the initial sampling and re-sampling events; Samples collected on May 27 and 28, 2010 and submitted for analysis of chromium (vi) exceeded the sample holding time before analysis; however, the concentrations reported for total chromium were all well below the EPA Table 3 SCS for chromium (vi). Surrogate recoveries were within acceptable ranges in all cases for all samples. Laboratory blanks, matrix spike samples, and laboratory duplicates were not reported by Caduceon. AMEC has been informed by Caduceon that sample analytical results are not reported unless these parameters meet the standards required by the Analytical Protocol. 1.3 Phase One ESA (AMEC, 2012a) The Phase One ESA (AMEC, 2012a) was undertaken as an update of the Phase I ESA (AMEC, 2010a) to meet the Phase One ESA reporting requirements under O. Reg. 153/04, as amended, to support the filing of a Record of Site Condition (RSC) in support of redevelopment of the Site to commercial, residential and parkland property uses. Page 14 of 52

15 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April Scope of Work The scope of work for the Phase One ESA consisted of the following tasks: Reviewing the historical occupancy of the Site through the use of available archived and relevant (in AMEC s opinion) municipal and business directories, fire insurance plans (FIPs), historical topographical plans (if applicable) and aerial photographs; Contacting municipal and provincial agencies to determine the existence of records of environmental regulatory non-compliance, if any, and reviewing such records where available. It should be noted that responses from these agencies may not be received prior to preparation of the report. The City will be notified when a response is received and any additional costs to obtain these records; Obtaining an EcoLog Environmental Risk Information Services Ltd. (ERIS) report for the Site and surrounding properties within a 500 metre (m) radius of the Site; Reviewing available geologic maps, well records and utility maps for the vicinity of the Site; Obtaining a search of land title and assessment rolls for the Site; Conducting a walk-through visual assessment (i.e., Site reconnaissance) of the Site and building facilities in order to identify the presence of actual and/or potential environmental contaminants or concerns of significance; Conducting interviews with designated Site representative(s) as a resource for current and historical Site information, as well as to provide AMEC staff with unrestricted access to all areas of the Site and Site buildings (as required by O.Reg. 153/04); Reviewing the current use of the Site and any land use practices that may have impacted its environmental condition; Reviewing the current use of the surrounding properties and any land use practices that may have impacted the environmental condition of the Site; Reviewing available previous environmental reports prepared for the Site; and, Preparing a report of our findings Current and Past Use of the Site Based on a review of the available information sources, it appears that the Site was developed for its use as a park and exhibition grounds beginning in the mid-1800s. Since that time, various buildings have been constructed and demolished on the Site, with the existing buildings having been constructed from 1898 through to Today, the majority of the Site is paved, both for at grade parking and for exhibition and entertainment use. The Site had hosted the annual Central Canada Exhibition since 1888 up until 2009 with some exceptions during war years. A weekly farmer's market was started at Lansdowne Park in Page 15 of 52

16 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 As the result of a review in the early 1990s, the City demolished some of the buildings and restored some parkland, notably along the Rideau Canal. The City also restored the Aberdeen Pavilion at that time. Due to structural problems, the lower grandstand of Frank Clair Stadium was demolished in July 2008 and not replaced. Current and past uses of the Phase One Property are summarized in Table D2. Page 16 of 52

17 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 Table D2: Current and Past Uses of the Phase One Property Years Owner Description of Property Use Property Use Other Observations from Aerial Photographs, Fire Insurance Plans, Etc City of Ottawa Agricultural Society (portion of the Site) Exhibition grounds Recreational/ Commercial Buildings present during this period included: the Main Building (a.k.a. Agricultural Building, Dog Show Building, and Manufacturers Annex), Ladies and Arts Building and attached band stand, Manitoba Hall, Dairy Building, the Grand Stand, stables for cattle and horses, and pens for sheep and swine. The area south of the Grand Stand included a race track and various show rings. Various Private Citizens (north portion of Site) Residential Residential The north portion of the current Site was not yet part of Lansdowne Park and was occupied by individual residential lots and residences as well as Lansdowne Avenue, Alexandria Street and Mary Street (now O Connor Avenue) extension. These properties were acquired by the City of Ottawa piecemeal from 1888 to The southern limit of the arm of the Canal extending onto the east-central portion of the Site was in-filled by Further in-filling was completed by 1900 creating a roughly rectangular pond. The pond was filled in at some point prior to Aberdeen Pavilion was opened in In 1903 it was converted into a hockey rink during the winter months. The original part (central and east portions) of the Coliseum Building was constructed for use as a Fat Stock and Poultry Show Building in 1903 and was expanded to the east in Further additions were built to the northeast and northwest in 1926 and used to house livestock. By 1950 a large addition called the Livestock Pavilion was added to the between the two previous additions of By 1975 the east portion and western most addition of the Coliseum Building were removed and by 1994 additions to the north had been removed as well. FIPs and an historic site plan circa 1946 indicated a boiler at the northeast corner of an addition to the northeast corner of the Coliseum Building; a boiler room in the north Annex of the Coliseum Building, northeast of the current northeast corner of the building; two boilers in a small outbuilding constructed north of the Coliseum Building and connected via a corridor; and a transformer located west of an addition built north of the Coliseum Building. The Ottawa Football Club began renting the land to the south of the Grand Stand in Over time this area evolved into Frank Clair Stadium. Bleachers were constructed on the south side of the stadium in An upper level and canopy were added in The Civic Centre and the North Side Stands, as they exist today were constructed by By 1979 Frank Clair Stadium existed as it appears today with the exception of variations in the field configuration (e.g., baseball diamonds added and removed over time). A fire in 1907 destroyed the Ladies and Art s Building, Experimental Farms Building, Dairy Building and the original wooden Grand Stand The City of Ottawa (24.5 acres south portion of Site) Multi-purpose exhibition and recreation facility Recreational/ Commercial Page 17 of 52

18 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 Years Owner Description of Property Use Property Use Other Observations from Aerial Photographs, Fire Insurance Plans, Etc. The Arts and Ladies Building (a.k.a. Ladies Fine Arts Building) was rebuilt in 1908 and later demolished in 1966 to make way for construction of the Civic Center. The Grand Stand was rebuilt using steel and concrete construction in The lower level of the Grand Stand housed a dining hall, Secretary s office, Treasurer s office, Press Room, Fire Station, Police Station and exhibition hall. In 1913 the Machinery Hall was constructed immediately adjacent the east Site perimeter with only the southwest portion extending onto the Site. Machinery Hall was later destroyed by fire in 1944 and replaced by the General Purpose Building constructed in the same location. A historic Site plan circa 1946 identifies the General Purpose Building as a Garage. The Garage was used for storage and parking of equipment and vehicles and was not used for vehicle repairs or maintenance. In 1961 the General Purpose Building was converted to a curling facility with seven sheets of ice. In 1914 the Horticultural Building was constructed. Undated building plans identify a basement level boiler room near the southeast corner of the building as well as a coal storage room and chute south of the boiler room. Five sheets of ice for curling were added to the Horticultural Building in Beginning in 1914 the Department of Militia and Defence (now the Department of National Defence) used the grounds and buildings during World War I for the training of troops. This was repeated during World War II. This included construction of two buildings identified as the CWAC mess and quarters, both located immediately east of the Site both of which were not longer present by A Lavatory located east of the Horticultural Building is noted as a former boiler room used by the Military. The Press Building was constructed in 1920 immediately east of the Horticultural Building and was demolished by The Assembly Hall was built circa 1925 and later demolished in 1966 to make way for the current Civic Centre. The cattle and horse stables and sheep and swine pens were torn down in 1925 and The Pure Foods Building, located immediately north of the east portion of the current Site boundary, was constructed in Pre-1945 various records indicate two landfills located on-site. One on the south portion of the Site and one on the east portion of the Site roughly corresponding to the in-filled arm of the Canal once present at the Site. In 1957 the McElroy Building was built. Eight sheets of ice for curling were added to the McElroy Building supported by an ice making plant in the basement in A previous Phase I ESA (Paterson, 1998a) identified an oil spill in the basement boiler room of the McElroy Corporation of the City of Ottawa Multi-purpose exhibition and recreation facility Recreational/ Commercial Page 18 of 52

19 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April 2012 Years Owner Description of Property Use Property Use Other Observations from Aerial Photographs, Fire Insurance Plans, Etc. Building. During this period of time numerous other small buildings were erected and demolished, most of which were not identified in any detail or were deemed insignificant for the purposes of the Phase One ESA. One noteworthy structure, however, is a small building for gasoline and oil storage were noted on the east portion of the Site, near the General Purpose Building on a circa 1946 site plan National Capital Commission Multi-purpose exhibition and recreation facility Recreational/ Commercial No noteworthy changes observed present The City of Ottawa Recreational/ Commercial In 1992 the Curl-O-Drome (General Purpose Building) was demolished and the area converted to green space, now owned by the NCC. A restoration of the Aberdeen Pavilion was also undertaken in By 1994 the addition to the east of the Horticultural Building was no longer present and Sylvia Holden Park had been developed. The McElroy Building was demolished in In 2008 the lower portion of the south side stands at Frank Clair Stadium were demolished. Page 19 of 52

20 City of Ottawa Risk Assessment Lansdowne Park, Ottawa, Ontario April Potentially Contaminating Activities Several potentially contaminating activities (PCAs) were identified both at the Site and within the Phase One Study Area. PCAs are identified on Figure 5 and described below. Site Gasoline and Associated Products Storage in Fixed Tanks (PCA 1) Several boilers have been present at the Site including the former Coliseum Annex, the former East Lavatory, the former McElroy Building and potentially the Horticultural Building. In some cases the boilers are known to have been fueled by heating oil while others such as the Horticultural Building are speculated to have been fueled by heating oil for periods between the use of coal and natural gas. In addition, a former gasoline and oil storage building was present on the east portion of the Site during military occupation during WWII; Importation of Fill Material of Unknown Quality (PCA 2) - the Site has been subjected to various degrees of Site-wide filling to achieve the existing grade elevations. Significant quantities of fill were placed to reclaim the former inlet of the Rideau Canal which extended in a southerly direction from the northeast corner of the Site to the area east of Frank Clair Stadium. Trace waste materials including wood, glass, brick and ash have been reported at borehole locations in the vicinity of the McElroy Building, Civic Centre and Aberdeen Pavilion; however, no evidence of contamination was reportedly observed at these locations (Golder 2008); Transformer Manufacturing, Processing and Use (PCA 4) - A historic transformer was noted to exist north of the west end of Coliseum Building, between two adjacent buildings comprising the former Annex. A Hydro Ottawa transformer that currently supplies the Site presently resides at this location; Waste Disposal and Waste Management (PCA 5) - Former Lansdowne Park Landfill (Eastern Landfill Ur-27) is located on the east portion of the Site, while a suspected second landfill is inferred to be present beneath and to the south of the South Side Stands. The Eastern Landfill (Ur-27) reflects the last vestige of the former inlet from the Rideau Canal having comprised a wood timber lined pond constructed at the rear (east) of the Aberdeen Pavilion through sequential filling of the former inlet. Phase One Study Area Garages and Maintenance and Repair of Railcars, Marine Vehicles and Aviation Vehicles (PCA 6) A number of automotive garages were noted within the Phase One Study Area at 852, 855, 875, 885, 889, 890, 901 and 1063 Bank Street. The garages currently and/or historically located within the Phase One Study Area vary from 55 to 190 metres from the Site and were either located hydraulically downgradient to the Site or at distances great enough that they are not inferred to present significant concern with respect to the environmental condition of the Site. Gasoline and Associated Products Storage in Fixed Tanks (PCA 1) Several historic gasoline service stations were noted within the Phase One Study Area at 812, Page 20 of 52