ADG1304.21 Dewatering Management Plan_Rev1.1_17.12.24

                                                                                  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                                                                  1
1.4      DMP OBJECTIVES                                                                              1
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      DOUGLAS PARTNERS PTY LTD 2021                                                               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                                                                      9
5.1      BASEMENT EXCAVATION AND SHORING                                                             9
5.2      GROUNDWATER EXTRACTION                                                                      9
5.3      EXTRACTION/DISCHARGE RATES AND VOLUME                                                       9
5.3.1    DEWATERING EXTRACTION CALCULATION BASED ON SUBSURFACE SOIL PROFILE                          9
5.3.2    DEWATERING DISCHARGE RATE BASED ON STORMWATER SYSTEM SIZE (ESTIMATION)                      10
5.3.3    CONCLUSIONS ON EXPECTED EXTRACTION RATES                                                    10
5.4      DEWATERING DURATION                                                                         10
5.5      GROUNDWATER DRAWDOWN                                                                        10
5.6      GROUNDWATER TREATMENT                                                                       11
6        WATER QUALITY MANAGEMENT                                                                    12
6.1      RESPONSIBILITY                                                                              12
6.2      OPERATIONAL POLICY                                                                          12
6.3      PERFORMANCE CRITERIA                                                                        12
6.4      IMPLEMENTATION STRATEGY                                                                     12
6.4.1    GROUNDWATER TREATMENT SYSTEMS                                                               12
6.4.2    DEWATERING STRATEGY                                                                         13
6.4.3    INITIAL PUMP‐OUT                                                                            13
6.5      MONITORING                                                                                  13
6.5.1    VISUAL MONITORING                                                                           13
6.5.2    WATER QUALITY MONITORING                                                                    13
6.5.3    MONITORING RESPONSIBILITIES                                                                 14
6.6      MAINTENANCE                                                                                 14
6.7      REPORTING                                                                                   15
6.8      CONTINGENCIES                                                                               15
7        NOISE & ODOUR MANAGEMENT                                                                    17
7.1      RESPONSIBILITY                                                                              17
7.2      OPERATIONAL POLICY                                                                          17
7.3      PERFORMANCE CRITERIA                                                                        17
7.4      IMPLEMENTATION STRATEGY                                                                     17
7.4.1    NOISE                                                                                       17
7.4.2    ODOUR                                                                                       17


    ADG1304.21 Dewatering Management Plan_Rev1.1_17.12.24                                         Page iii