ADG1290.21 Dewatering Management Plan_Rev1_02.02.22 · 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                                                                          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 2020 & 2022                                                    4
3.1.1    SOILS                                                                                   4
3.1.2    GROUNDWATER                                                                             4
3.2      GROUNDWATER QUALITY                                                                     6
4        WATER QUALITY OBJECTIVES                                                                7
4.1      RECEIVING ENVIRONMENT                                                                   7
4.2      DEVELOPMENT OF WATER QUALITY OBJECTIVES                                                 7
4.3      PROPOSED WATER QUALITY OBJECTIVES                                                       8
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                                                                   11
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                                                                           16
7        NOISE & ODOUR MANAGEMENT                                                                18
7.1      RESPONSIBILITY                                                                          18
7.2      OPERATIONAL POLICY                                                                      18
7.3      PERFORMANCE CRITERIA                                                                    18
7.4      IMPLEMENTATION STRATEGY                                                                 18
7.4.1    NOISE                                                                                   18
7.4.2    ODOUR                                                                                   18
7.5      MONITORING                                                                              18


    ADG1290.21 Dewatering Management Plan_Rev1_02.02.22                                       Page iii