Attachment G - Stormwater Quality Management plan

                                                                                 Callaghan & Toth


3.0 DESCRIPTION
The site currently consists of three lots including part of Lot 3 SP230055, and Lots 1 and 2
RP153299 currently an open grassed area with an existing vegetated swale running through the
site and a concrete pathway connecting the library carpark to the bridge crossing Cooroy Creek
to the north.

The sites are bounded by Cooroy Creek to the north, the library carpark in the Marara Street
road reserve to the east and Maple Street road reserve to the south-west.


3.1      Contaminated Land:

Core Consultants undertook a contaminated land survey across the three lots in 2019. During
previous development on the site, contaminated land issues have been addressed by Council
and managed in accordance with Site Based Management Plans, mostly relating to
contaminants identified to the north of Cooroy Creek.

As such an investigation for the playground site included soil sampling for potential
contaminants associated with the previous timber mill activities which were based mostly north
of the creek. As a result of the investigation, Core Consultants found that:

         …the site is considered to pose a low health risk and is considered suitable for the
         current land use, which includes the proposed playground upgrades.

Subsequent to the initial investigation, anecdotal evidence a further investigation was
undertaken to determine presence/absence of polychlorinated dibenzodioxins and furans
(PCDD/F). Core undertook sampling and did find traces of PCDD/F at twelve targeted locations
across the site, with one borehole requiring treatment as follows:

         Soils within a 5m x 5m radius of BH27 can be removed from the site to an approved
         landfill facility

See Appendix B showing a plan of the boreholes on site.


3.1      Proposed Works
The overall proposal is to provide a nature-based playground in an existing open space area
south of Cooroy Creek adjacent to the library carpark and bounded by Maple Street in the
south. The proposed new Cooroy Hinterland Playground works involve constructing
playground-related infrastructure including:
               o Frog pond precinct
               o Water play precinct
               o Climbing precinct
               o Event precinct
               o Associated play equipment, climbing structures, etc
               o Above and underground-services (water, sewer, and drainage),
               o Toilet block,
               o Picnic shelters,
               o Pathways and landscaping.


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2001 Hinterland Playground SWMP                                               February 2020