MCU14/0056 Response to SARA - Consulting Report

          3.2        SPEL Puraceptor Sizing
          The sizing of the SPEL Puraceptor is based on the Rational Method that is common practice among
          hydrologists to determine the amount of runoff as a result of rainfall events. The geographical location of
          the site by means of its latitude and longitude figures is used along with the Intensity-Frequency-Duration
          (IFD) data provided by the Bureau of Meteorology to determine the amount of Rainfall Intensity relevant to
          the duration of time of concentration of the catchment area and 20 Years ARI (Annual Recurrence Interval).


          3.3        Performance Analysis
          SPEL Puraceptor devices have undergone rigorous and comprehensive testing for total suspended solids,
          heavy metals and hydrocarbons. The reduction values listed within are from flow tests conducted by the
          University of South Australia Hydraulics Research Laboratory (UniSA) and at HR Wallingford United
          Kingdom.

          3.3.1      University of South Australia Testing – Oil & TPH
          Tests were performed at the UNISA Hydraulics Research facility and at HR Wallingford UK with the device
          in flow mode, with the following results. Test methodology was done to European Standard BS EN 85.1
          Section 8.3.


          The oily water mix compiled by the UniSA was deliberately made to replicate service station runoff. This
          field testing illustrates that for an inflow of 5699 mg/l (5% over test target level of 5000 mg/l), which was
          expected to have deleterious effects on the performance of the unit, the SPEL Puraceptor was able to treat
          the runoff to a TPH concentration complying with the most stringent standards. This, points up the
          conservative and rigorous character of the testing conducted by UniSA. As such, the Puraceptor is
          considered to qualify as a Class 1 light liquid separator in accordance with EN 858-1. Moreover it is
          worthwhile to note Environmental Authorities worldwide regard less than 10 ppm as being the benchmark
          for no visible trace or sheen. Table 2.1 shows that discharge water quality reduction remains constant at
          <0.1ppm of TPH translating to `no visible trace` from a constant inflow concentration of 5,000ppm. The
          detail of the field study can be reviewed in Appendix 3.


          The Hydrocarbon mix used for the University of South Australia testing program was deliberately
          formulated to replicate the carbon fraction breakdown that we see in the field on service stations all over
          Australia. The NATA detection instruments detect all forms of hydrocarbon as in free phase, emulisified
          and dissolved fractions. The C6 – C9 fraction represents the BTEX (Benzene, Toluene, Ethylbenzene, and
          Xylene) constituent of the mix.

          Table 2.1- Reduction of Total Petroleum Hydrocarbons



                                   Inflow               Outlet Samples TPH Fraction Concentrations     Calculated
          Hydrocarbon
                           EQL*    Concentration                                                       Mean
          Fraction
                                   (Total 5699.0)                                                      Concentration
                                                        1         2       3         4        5


          C6-C9            0.02    0.15                 <0.02     <0.02   <0.02     <0.02    <0.02     <0.02


          C10-C14          0.04    125.43               <0.04     <0.04   <0.04     <0.04    <0.04     <0.04


          C15-C28          0.10    5570.62              <0.1      0.162   <0.1      <0.1     <0.1      < 0.032




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