Reference Document Dewatering Plan 28_9_2023 OPW26_0094 · OPW26/0094

                                                                              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                                                                         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      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
5.4      DEWATERING DURATION                                                                  10
5.5      GROUNDWATER DRAWDOWN                                                                 10
5.6      GROUNDWATER TREATMENT                                                                10
5.7      NOMINATED HOLD POINTS                                                                10
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                                                                          15
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




    ADG1580.23 Dewatering Management Plan_Rev0_28.09.23                                       Page iii