Information Request OPW23 0179 · OPW23/0179

                 Issue
                 Flooding and access to the basement. The driveway ramp to the basement does not
                 incorporate the required 300mm freeboard above the defined flood level (DFE).
                 Information Required
                 3.       Amend the driveway and access design to ensure that 300mm freeboard above the DFE
                          is achieved for all openings to the basement or provide a passive flood barrier system
                          which will achieve the equivalent level of protect and flood immunity for the basement.
                 Issue
                 The submitted dewatering management plan requires amendment.
                 Information Required
                 4.       Provide an updated dewatering management plan that includes the following:
                         i.   The DMP states that the shoring design is provided in Appendix C – however only
                              the civil engineering plans are provided. Include plans which show the location and
                              type of temporary shoring, groundwater spears, treatment and monitoring equipment
                              location and space requirements. Why do the structural engineering plans (provided
                              separately) only show shoring on 3 sides of the excavation? The type of CFA piling
                              (contiguous or secant) should also be stated on plan
                        ii.   Remove references to ‘steel sheet piling’ on page 10 and refer to CFA secant piling.
                              Please note that the references should reflect the proposed method or the alternate
                              method chosen by the civil engineer.
                       iii.   Update section 6.5.2 and 6.5.3 (Water Quality Monitoring) to include continuous
                              monitoring of pH and dissolved oxygen at the release point from the treatment
                              system. Total iron and aluminum are to be sampled where identified in the document
                              as ‘if required’.
                       iv.    Update the figure in Appendix A to also show the stormwater network and specifically
                              the stormwater pit which the dewatering system will discharge into and the outlet
                              headwall.
                        v.    Update section 6.4.3 to identify that discharge is to the stormwater network prior to
                              entering the canal system.
                       vi.    There seems to be plenty of room in the frontage of the site for establishing a
                              groundwater monitoring bore outside of the excavation and shoring system in which
                              to monitoring groundwater drawdown and quality. Update the monitoring section of
                              the DMP to incorporate such a monitoring location.
                      vii.    Section 7 (Noise) is to be updated to refer to the default noise standard for pumps
                              in Section 440T of the EPAct. The EEP (Noise) objectives currently referenced are
                              long-term objectives rather than a specific enforceable standard.
                      viii.   Provide dilapidation reports for neighbouring properties and any other structures or
                              infrastructure identified as being within the estimated cone of depression associated
                              with the groundwater drawdown.
                 Issue
                 A number of the submitted engineering plans are stamped “not for construction” and have not
                 been signed by the RPEQ.




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Document Set ID: 22730091
Version: 2, Version Date: 15/12/2023