ADG Dewatering Management Plan · OPW21/0315

                                                                                  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 2020                                                               4
3.1.1    SOILS                                                                                       4
3.1.2    GROUNDWATER                                                                                 4
3.2      GROUNDWATER QUALITY                                                                         4
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                                                                       10
6        WATER QUALITY MANAGEMENT                                                                    11
6.1      RESPONSIBILITY                                                                              11
6.2      OPERATIONAL POLICY                                                                          11
6.3      PERFORMANCE CRITERIA                                                                        11
6.4      IMPLEMENTATION STRATEGY                                                                     11
6.4.1    GROUNDWATER TREATMENT SYSTEMS                                                               11
6.4.2    DEWATERING STRATEGY                                                                         12
6.4.3    INITIAL PUMP-OUT                                                                            12
6.5      MONITORING                                                                                  12
6.5.1    VISUAL MONITORING                                                                           12
6.5.2    WATER QUALITY MONITORING                                                                    12
6.5.3    MONITORING RESPONSIBILITIES                                                                 13
6.6      MAINTENANCE                                                                                 14
6.7      REPORTING                                                                                   14
6.8      CONTINGENCIES                                                                               14
7        NOISE & ODOUR MANAGEMENT                                                                    16
7.1      RESPONSIBILITY                                                                              16
7.2      OPERATIONAL POLICY                                                                          16
7.3      PERFORMANCE CRITERIA                                                                        16
7.4      IMPLEMENTATION STRATEGY                                                                     16
7.4.1    NOISE                                                                                       16
7.4.2    ODOUR                                                                                       16


    ADG1290.21 Dewatering Management Plan_Rev0_12.10.21                                           Page iii