Attachment 6 - Stormwater Management Plan

R2015: NOOSA LANDFILL - STORMWATER MANAGEMENT PLAN



1.4.                LICENSE CONDITIONS AND WATER QUALITY OBJECTIVES

The following conditions specified by the site permit (Permit No. BRID0056) relate, directly or indirectly, to the
management of stormwater:

WT1 – Site erosion protection measures and sediment control measures must be implemented and must have the
hydraulic effectiveness to treat stormwater for 90% of the annual runoff for each stormwater catchment.

Where soils are temporarily exposed for the construction of new facilities or to facilitate changes in landfill design, all
reasonable and practical measures must be implemented to minimise the amount of sediments able to discharge from
the site. As a minimum the following design criteria apply:

       1.     Collect and drain stormwater from disturbed soils to a sediment basin sized to contain an 80 th% five-day event
              or similar; and
       2.     The design life and design storm for temporary drainage works to convey waters to the sediment basin and
              around disturbed areas are:
                   a. Disturbed area open < 12 months – 1 in 2-year ARI event plus 150mm freeboard
                   b. Disturbed area open 12-24 months – 1 in 5-year ARI event plus 150mm freeboard
                   c. Disturbed area open > 24 months – 1 in 10-year ARI event plus 150mm freeboard
                   d. Temporary culvert crossing – minimum 1 in 1-year ARI hydraulic capacity

WT2 - The release of collected and treated stormwater to waters, from areas of the site not likely to be contaminated
with waste materials, must be in accordance with Table 2 – compliance limits for controlled releases of treated stormwater
to surface waters

              Note: Table 2 is reproduced below as Table 1.

Table 1 – Surface Water Release Limits

          QUALITY
                                       RELEASE POINT        RELEASE LIMIT           LIMIT TYPE               MONITORING FREQUENCY
       CHARACTERISTICS

                   pH                                           6.5 - 9.0              Range

      Specific Conductance
                                                                  1500               Maximum           Commencement of Release then weekly
             (µS/cm)
                                                                                                         thereafter. If no release occurs, no
    Dissolved Oxygen (mg/L)                                         6                Minimum                   sampling is required.
       Total and Dissolved
                                                                  N/A                Maximum
        Aluminium (mg/L)

                                                                                                       Commencement of Release then weekly
                                             W1                                                          thereafter for a minimum of 5 events
                                                                                                        and until a reliable TSS:NTU correlation
    Suspended Solids (mg/L)                                        50
                                                                                                        is established and agreed in writing by
                                                                                                       the administering authority. If no release
                                                                                                            occurs, no sampling is required.

                                                             The established       The NTU value
                                                              correlation of      that correlates to   Commencement of Release then weekly
            Turbidity (NTU)                                turbidity with total   50mg/L TSS with        thereafter. If no release occurs, no
                                                            suspended solids       a correlation R             sampling is required.
                                                                  (TSS)              value of 0.9




WT3- Monitoring of contaminant releases from release point W1 must be undertaken in accordance with the condition
WT2.

WT4 - In addition to WT2, released to waters must not:

       1.     have any other properties and content concentration causing environmental harm
       2.     produce any slick or other visible evidence of oil or grease, nor contain visible floating oil, grease, scum, litter or
              other visually objectionable matter.




Environment. Engineering. Education.                                                                                                      PAGE 3