MCU14/0056 - Attachment G - Engineering Report & Stormwater Management Plan

                                                                                                              ENG
                                                  Engineering Report & Stormwater Management Plan
                                          Date:          16/06/2014     Document No.:     14012-ENG-01.Docx

                                           By:              AvT          Revision No.:              B


          the rubber type shall be NBR (nitrile) complying with AS 1646.3 (Elastomeric seals for
          waterworks purposes – Material requirements for pipe joints seals used in water and
          wastewater applications with the exception of natural rubber and polyisoprene
          compounds). The ring shall be water tight to 90kPa internal pressure and comply with
          the general requirements of AS 1646.1 (Elastomeric seals for waterworks purposes –
          General requirements).
     •    The underground containment vessel shall maintain adequate capacity to contain
          both a volume equivalent to at least the volume of the largest tanker compartment
          likely to be delivering fuel to the site plus a nominal allowance for windblown rain.
     •    The roof or canopy shall overhang by a horizontal distance of ¼ of the roof height out
          from the vertical above the boundary of the demarcated FDA.
     •    Preference is for stormwater from roofed areas to be collected in tanks for non-
          potable use (e.g. toilet flushing or garden watering). Alternatively, it may be diverted
          directly to on-site stormwater infrastructure.
     •    Bulk fuel transfers may be carried out under the canopy area within a defined Tanker
          Delivery Standing Area graded and drained to the underground containment
          vessel.
Areas Outside of Canopy:
   • All ground surfaces not under canopy shall be constructed of concrete or equivalent
       with all gaps and/or cracks filled so that the impervious barrier and integrity is
       maintained.
   • Drainage separation options may include grading, bunding, kerbing and/or
       channelling.
   • Bulk fuel transfers shall be carried out in a defined Tanker Delivery Standing Area. This
       area shall normally be drained to the uncovered area stormwater treatment system.
       However, during fuel delivery operations, automatic diversion valves shall be used to
       divert such drainage to the under-canopy containment vessel. The Tanker Delivery
       Standing Area in uncovered locations shall be sized so that the drainage area has a
       radius of at least 3 meters and a storage volume equivalent to that of the largest
       tanker storage compartment that is expected on site at any given time
     •    Signs indicating fate of flow such as “flows to creek” shall be provided in
          locations around the uncovered area.
     Service Station Treatment
The fuel dispensing areas shall be graded to a suitable underground containment and
treatment vessel (i.e. sump/tank) compatible with petroleum products and other likely
chemicals. It is proposed that a SPEL Puraceptor containment system be installed to capture
and retain flows from the fuel dispensing areas.

The SPEL Puraceptor (model P.040.C1.2C) is a 6 minute full retention tank that will hold and
treat all the stormwater runoff from the associated forecourt area catchment area of 538m2.
Based on a rainfall duration of 5 minutes and a rainfall intensity of 245 mm/hr for 20 ARI the
associated runoff is approximately 37l/s. The proposed SPEL Puraceptor P.040.C1.2C can treat
up to 40l/s, therefore it is considered to be suitable for this application.




A PO Box 26, Carina Q 4152                                                                   15 | P a g e
E [email protected]
W www.vtce.com.au