F0002-AA007595-AAR-10-SMP · MCU14/0102.05

            2.2        SPEL Puraceptor Sizing

            The sizing of the SPEL Puraceptor is based on the Rational Method that is common practice among water
            engineers to determine the treatment flow rate 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 3 month ARI (Annual Recurrence Interval).


            2.3        SPEL Puraceptor Application Areas

            Typically, fuel stations have been required to install a blind sump to capture any hydrocarbon spills. A blind sump
            is effectively an underground tank that has no outlet. These sumps have been designed with an upstream
            drainage network to capture runoff from the under-canopy areas and the fill box used by tankers to refill
            underground tanks. These areas have traditionally been considered the “high-risk” areas for fuel spills, and so
            treatment measures have focussed on capturing and retaining runoff/spills from these areas for subsequent
            removal via vacuum truck. In reality, a hydrocarbon spill is a higher risk anywhere on a fuel station site in
            comparison to a residential catchment, for example. It is considered, therefore, that runoff from all areas of fuel
            stations should be treated. Where this becomes problematic with blind sumps, is that they provide no treatment
            and are simply capture systems. Therefore, they must be emptied each time they are full. In many cases, blind
            sumps fill with stormwater that occupies, and reduces, hydrocarbon volume should a spill occur. The solution is
            to implement a treatment system that can remove hydrocarbons from stormwater runoff, allowing treated
            water to escape, yet retain hydrocarbons and seal the system if a spill occurs. This is the function provided by
            the Puraceptor.


            2.4        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.

            2.4.1      University of South Australia Testing – Oil & TPH
            Tests were performed at the UNISA Hydraulics Research facility with the device in flow mode, with the following
            results. Test methodology was done to European Standard BS EN 858.1 Section 8.3.

            The oily water mix compiled by the UniSA was specifically 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, highlights 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 should be noted that Environmental Authorities



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