Geo-environmental Investigation · MCU25/0020

Table 6: Water Quality Release Criteria

                        Indicator                                       Release Limit
                            pH                                            6.5 to 8.5
                Total Suspended Solids                                    < 50 mg/L
                 Dissolved Aluminium                                      < 0.3 mg/L
                     Dissolved Iron                                       < 0.2 mg/L
                                                      No visible litter, sheen or odour washed from the
                 Litter/Gross Pollutants               site or deposited in waters downstream of any
                                                                            discharge

Groundwater extracted during construction would be expected to require quality adjustment prior to off-
site release to stormwater. At a minimum, this is expected to involve buffering (increasing) of the pH to
within the range 6.5 to 8.5 by the addition of a suitable agent, followed by the addition of a flocculant,
and sufficient settling/contact times to reduce turbidity and metal loads. Effective treatment of
groundwater to achieve suitable release criteria requires reasonable spatial and temporal consideration.
An experienced dewatering sub-contractor should be consulted to ensure appropriate outcomes can be
achieved.




8.           Limitations
Your attention is drawn to the document Limitations, which is included in Appendix C of this report. The
statements presented in this document are intended to advise you of what your realistic expectations of
this report should be, and to present you with recommendations on how to minimise the risks associated
with the services provided by Tectonic for this project.




Geo-environmental Investigation Proposed Residence
11 March 2025 | 25040-001-Rev0                                                                         22