Attachment 4 - Stormwater Managment Plan

SQIDEP Evaluation                                          SPEL Basin, Sippy Downs


Performance         Performance Requirement                                     Monitoring action or result          Compliance or
Criteria                                                                                                             non
                                                                                                                     compliance

                                                                                cartridge of sorts – both of which
                                                                                would typically be credited with
                                                                                gross pollutant capture. The
                                                                                caveat here is that every
                                                                                installation of SPEL Basin must
                                                                                include a SPEL Sack at the entry
                                                                                pit.

Performance         ER and CRE. If CRE average and median > 10% difference      Both ER and average CRE was          Compliance.
Indicators          inspect dataset.                                            reported. The evaluators
                                                                                determined the median CRE and
                                                                                found median CRE aligned very
                                                                                closely with ER and the difference
                                                                                was less than 10%. The
                                                                                difference between ER and
                                                                                average CRE was found to be >
                                                                                10%. It was agreed with the
                                                                                Applicant that an average of ER
                                                                                and average CRE would be
                                                                                adopted as a conservative
                                                                                approach that enables both
                                                                                metrics to be used and gives
                                                                                them equal weighting. We note
                                                                                that adoption of average CRE in
                                                                                lieu of median CRE reduced the



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