Acid sulfate Management Plan Reference Document OPW19-0239 · OPW19/0239

PROCEDURE C
Monitoring of Water Quality


C1.       GENERAL
The procedures outlined below are provided to monitor and manage water quality in open excavations and
run-off collection in treatment areas. Contingency measures are also provided for treatment and discharge of
minor amounts of water.

C2.       OBJECTIVES
     Appropriately monitor waters entering open excavations

     Appropriately manage waters to be discharged from open excavations

     Appropriately monitor and treat (if required) run-off collected in treatment areas

     Appropriately monitor groundwater to identify water quality changes that may indicate ASS impact

     Comply with conditions of licences, permits or other approvals issued for the project

C3.       STATUTORY REQUIREMENTS AND GUIDELINES
1)    State Planning Policy – state interest guideline, Water quality, August 2014

2)    Queensland Acid Sulfate Soil Technical Manual: Soil Management Guidelines V4.0, 2014. Dear, S-E.,
      Ahern, C. R., O'Brien, L. E., Dobos, S. K., McElnea, A. E., Moore, N. G. & Watling, K. M. Department of
      Science, Information Technology, Innovation and the Arts, Queensland Government

3)    Environmental Protection Act 1994

4)    Environmental Protection Policy (Water) 2009

C4.       IMPLEMENTATION MEASURES
The following provides a list of the environmental control measures for management of surface water and
groundwater at the site:

     Water quality monitoring will be undertaken in accordance with C5

     All surface water run-off and groundwater seepage within excavations is to undergo monitoring to
      determine if treatment is required for quality correction prior to off-site discharge, or reuse on site

     Agricultural lime or caustic soda will be kept on site at all times for pH adjusting of waters before
      discharging

     Discharge to surface waters, sewers or stormwater should meet with the requirements and conditions of
      the disposal permit issued for the project

     Two groundwater monitoring wells shall be installed external to the proposed basement excavation (one
      on the northern side of the basement and one on the southern side). Groundwater monitoring wells
      shall be monitored four times over a period of one month before earthworks and construction
      commence to establish baseline levels of the following parameters;

       Field measurements of pH, redox potential (Eh or ORP), dissolved oxygen, standing water level and
          electrical conductivity (EC)

       Laboratory measurements chloride, sulfate, total acidity, total alkalinity, dissolved aluminum
          (filtered), and dissolved iron (filtered)

C5.      INSPECTION AND MONITORING
C5 (a) Surface Water Monitoring
Waters from dewatering (if required) and all surface water run-off and groundwater seepage within
excavations shall be monitored prior to discharge during earthworks and construction works. Surface water
shall be monitored for pH, dissolved oxygen, suspended solids, oil, grease floating scum, litter and total and
dissolved aluminium and iron.


April 2019
J000799-003-R-Rev0 – Procedure C                        1/3