Reference Document - Dewatering Management Plan (For Stamping) MCU25/0053 & OPW25/0074

                                                                                                    ADG Consulting Pty Ltd



                                                                             Table of Contents

                      1        INTRODUCTION                                                                           1
                      1.1      PROPOSED DEVELOPMENT                                                                   1
                      1.2      RELEVANT GUIDELINES                                                                    1
                      1.3      GENERAL ENVIRONMENTAL DUTY                                                             2
                      1.4      DMP OBJECTIVES                                                                         2
                      1.5      SCOPE OF WORK                                                                          2
                      2        SITE CHARACTERISTICS                                                                   3
                      2.1      PROPERTY DESCRIPTION                                                                   3
                      2.2      SURROUNDING ENVIRONMENT                                                                3
                      2.3      TOPOGRAPHY                                                                             3
                      2.4      GEOLOGY & SOILS                                                                        3
                      2.5      HYDROGEOLOGY                                                                           3
                      3        PREVIOUS INVESTIGATIONS                                                                4
                      3.1      PTG CONSULTING 2025                                                                    4
                      3.1.1    SOILS                                                                                  4
                      3.1.2    GROUNDWATER                                                                            4
                      3.2      GROUNDWATER QUALITY                                                                    5
                      4        WATER QUALITY OBJECTIVES                                                               6
                      4.1      RECEIVING ENVIRONMENT                                                                  6
                      4.2      DEVELOPMENT OF WATER QUALITY OBJECTIVES                                                6
                      4.3      PROPOSED WATER QUALITY OBJECTIVES                                                      7
                      5        DEWATERING METHODOLOGY                                                               10
                      5.1      BASEMENT EXCAVATION AND SHORING                                                      10
                      5.2      GROUNDWATER EXTRACTION                                                               10
                      5.3      EXTRACTION/DISCHARGE RATES AND VOLUME                                                10
                      5.3.1    DEWATERING EXTRACTION CALCULATION BASED ON SUBSURFACE SOIL PROFILE                   10
                      5.4      DEWATERING DURATION                                                                  11
                      5.5      GROUNDWATER DRAWDOWN                                                                 11
                      5.6      GROUNDWATER TREATMENT                                                                12
                      5.7      NOMINATED HOLD POINTS                                                                12
                      6        WATER QUALITY MANAGEMENT                                                             13
                      6.1      RESPONSIBILITY                                                                       13
                      6.2      OPERATIONAL POLICY                                                                   13
                      6.3      PERFORMANCE CRITERIA                                                                 13
                      6.4      IMPLEMENTATION STRATEGY                                                              13
                      6.4.1    GROUNDWATER TREATMENT SYSTEMS                                                        13
                      6.4.2    DEWATERING STRATEGY                                                                  14
                      6.4.3    INITIAL PUMP‐OUT                                                                     14
                      6.5      MONITORING                                                                           14
                      6.5.1    VISUAL MONITORING                                                                    14
                      6.5.2    WATER QUALITY MONITORING                                                             14
                      6.5.3    MONITORING RESPONSIBILITIES                                                          15
                      6.6      MAINTENANCE                                                                          16
                      6.7      REPORTING                                                                            16
                      6.8      CONTINGENCIES                                                                        17
                      7        NOISE & ODOUR MANAGEMENT                                                             18



                          ADG1777.25 Dewatering Management Plan_Rev0_01.05.25                                       Page iii




Document Set ID: 23735664
Version: 1, Version Date: 12/05/2025