Performance Verification Plan

Transcription

1 Southwest Marine Drive Vancouver, BC Prepared for: 6735 Salish Drive Vancouver, BC V6N 4C4 Prepared by: Pottinger Gaherty Environmental Consultants Ltd. # West Georgia Street Vancouver, BC V6E 4E6 October 2014

2 Table of Contents 1.0 Required Risk Controls Action Required to Implement Risk Controls Rationale for selecting Performance Verification Plan Elements Standard Limitations... 2 LIST OF FIGURES Figure 1 Risk Management Implementation Zone

3 October 2014 Page 1 Performance Verification Plan Site ID: Site Location: 1314 to 1348 Southwest Marine Drive, Vancouver, BC Risk Control Type: 2 This document is meant to satisfy the reporting requirements for Type 2 risk controls as outlined in Contaminated Sites Regulation (CSR) Administrative Guidance 14. Specifically, this document outlines the performance verification plan for implementing the institutional risk management measures described below. 1.0 REQUIRED RISK CONTROLS The following institutional risk controls are equired at the site: a) Future buildings at the site must be slab-on-gradmust be prepared by a qualified professional to minimize the inhalation of vapour contamination by archaeologists s, construction, and utility workers while completing activities in a trench 1 setting in the northern area of Lott 6 defined by Figure 1; construction; b) A health and safety plan c) Deep-rooting vegetation 2 must not be established inn the northern area of Lot 6 defined by Figure 1; d) Groundwater wells intendedd to supply potable water must not be installed at the site; and e) Land use in the northern area of Lot 6 defined by Figure 1 in the Performance Verification Plan (Report #1) must not include a residence by persons on a permanent, temporary or seasonal basis, including, without limitation, single-family dwellings, cabins, apartments, condominiums or townhouses. 2.0 ACTION REQUIRED TO IMPLEMENT RISK CONTROLS The following measures are required to implement risk controls: a) Mandatory communication with the site owner/operator to ensuree future buildings at the site will be limited to slab-on-grade construction; b) Mandatory communication with the site owner/operator to ensure that a health and safety plan is prepared prior to trench work in the northern area of Lot 6, defined by Figure 1 to minimize the inhalation of vapour contamination by archaeologists, construction workers and utility workers while completing activities in a trenching setting; c) Mandatory communicationn with the site owner/operator to ensure thatt deep-rooting vegetation is not established in the northern area of Lot 6 defined by Figure 1; d) Mandatory communication with the site owner/operator to ensure that groundwater wells intended to supply potable water are not installed; andd e) Mandatory communication with the site owner/operator to ensure that land use in the northern area of Lot 6 defined by Figure 1 must not include a residence by persons on a permanent, temporary or seasonal basis, including, without limitation, single-family dwellings, cabins, apartments, condominiums or townhouses. 1 Defined as an excavation with a depth greater than 1..5m, a depth greater than its width, and intended for human entry. 2 Defined as vegetation with root mass that extend deeper than 2m below ground surface.

4 September 2014 Page 2 Records of these performance verification actions shouldd be maintained by the site owner to be submitted to the Ministry of Environment if requested. A statement signed by an Approved Professional on whether the Risk-management measures have been implemented and are being met must be submitted to the Director after 5 years within 90 days of the anniversary of the date of issuance of the Certificate of Compliance or as otherwise approved by the Director. This level or reporting is warranted based on our understanding of the cultural and archeological significance of the site, and its intended future use. The site will be developedd as a park/institutional use, and is unlikely to be developed for residential use. Additionally, the site owner will be the sitee operator for the foreseeable future, and there is low risk of transferring the land. The current owner is aware of the Risk-management measures. Once the final configuration of the park is established, it is unlikely to change. 3.0 a) Soil-vapour concentrations at the site exceed thee CSR Schedule 11 standards (PGL s Stage 2 Investigation Report, dated September 2014). PGL s Risk Assessment indicates that a concrete slab will be a sufficient barrierr to contamination. b) Unacceptable risk levels associated with inhalation off volatile petroleum hydrocarbons (VPH), as represented by F1 aliphatics (C 6 -C 8 and C >8 -C 10 ), F1 aromatics (C >8 -C 10 ) and 1,2-dichloroethane were identified in PGL s Risk Assessment Report dated September 2014; A health and safety plan which includes measures that mitigate the inhalation pathway is recommended only for the area of the site wheree contaminan concentrations have the potential to cause adverse health effects. This area iss in the northern area of Lot 6 defined by Figure 1. c) Contamination n remains in place in soil and groundwater located 2m to 14..5m below the ground surface. PGL s Risk Assessment Report dated September 2014 recommends not planting deep-rooting the contaminated soil or groundwater in the area identified to minimize the uptake of contaminants. d) Contamination n remains in place in groundwater exceeding the CSR Schedule 6 Drinking Water standards. Regular inspection to ensure that the Site does not have a drinking well installed is not required because: o The site is connected to the municipal water supply and will be for the foreseeable future; o The planned future use of the site as an urban park would not t need a drinking water well; and vegetation (primarily trees and shrubs with a root depth capable of contacting o The site owner will be the site operator for the foreseeable future, and is aware of the restrictionss on installing drinking water wells. e) The Risk Assessment Report dated September 2014, included the scenarios where individuals may use the park or visit the interpretive center, but didd not include the residential land use scenario. Without further assessment, the site, in particular the northern portion of Lot 6 as shown in Figure 1, should not be used for residential purposes. 4.0 RATIONALE FOR SELECTING PERFORMANCE VERIFICATION PLAN ELEMENTS STANDARD LIMITATIONS PGL prepared this report for and its agents exclusively. It may be relied upon by these parties, the BC Ministry of Environment andd the Contaminated Sites Approved Professionals Society exclusively. PGL accepts no responsibility for any damages that may be suffered by third parties as a result of decisions or actionss based on this report.

5 September 2014 Page 3 The purpose of the Performance Verification Plan is too provide the client and the Ministry of Environment with the steps necessary to implement and maintain the recommended risk management measures at the site. These recommendations are based on information collected during PGL s environmental investigations. These investigations consisted of a screening for potential contamination and, as is true for all environmental investigations, potential remains for the presence of unknown, unidentified, or unforeseen surface or subsurface contamination. More or different investigation may be required, and additional risk management measures may be required if other risks are identified. The data used to develop these risk management measures is valid for the date of sampling, but site conditions may change with time. The findings and conclusions are site-specific and were developed in a manner consistent with that level of care and skill normally exercised by environmental professionals currently practicing under similar conditions in the area. Changing assessment techniques, regulations, and site conditions means that environmental investigations andd their conclusions can quickly become dated, so this report is for use now. The project has been conducted according to our instructions and work program. Additional conditions and limitations on our liability are set forth in our work program/contract. This report is neither an endorsement nor a condemnation n of the subject property. No warranty, expressed or implied, is made. Respectfully submitted, POTTINGER GAHERTY ENVIRONMENTAL CONSULTANTS LTD. Per: Zayed Mohamed, B.Sc., P.Ag. Environmental Scientist Simone Mol, Ph.D., PChem Senior Environmental Scientist ZPM/SNM/mtl/slr r pvp-oct14-rev2.docx

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