Attachment I - Updated Engineering Report & SWMP

 BASIN PROTECTION:




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 1.    BIO BASIN IS TO BE A SEDIMENT BASIN UNTIL ALL EARTHWORKS AND ROADS COMPLETED AND LOTS




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       ARE FULLY STABILIZED.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              1.       ALL BIORETENTION BASINS TO BE COVERED WITH A SACRIFICIAL LAYER OF GEOFABRIC,




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 2.    BASIN OUTLETS/INLETS, RETAINING WALLS, HDPE LINER AND SUBSOILS TO BE CONSTRUCTED —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          TOPSOIL AND TURF UNTIL PRACTICAL COMPLETION OF CIVIL WORKS OR UNTIL 90% OF




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       HOLD POINT FOR INSPECTION BY RPEQ AND BCC (IF NOTED IN PRESTART MEETING).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   BUILDING WORKS WITHIN THE LOTS ARE COMPLETE, WHICH EVER IS LATER. AT THIS POINT




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 3.    THE BASIN DRAINAGE LAYERS AND FILTER IS TO BE PLACED AND TEMPORARILY PROTECTED USING                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        THE TEMPORARY COVER IS TO BE REMOVED AND REPLACED WITH LANDSCAPED PLANTS AS




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       GEOTEXTILE PLACED OVER FILTER WITH 75mm TOPSOIL AND TURFED. BASIN BATTERS ARE TO BE                                                                                                                                                                             D.P
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   PER NOTE 2. PLANTS ARE THEN TO BE MAINTAINED FOR A PERIOD OF 3 YEARS BEFORE
       PLANTED                                                                                                                                                                                                                                                                                                                    1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                BEING ACCEPTED 'OFF-MAINTENANCE.'
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 4.    IN ACCORDANCE WITH LANDSCAPE PLANS.                                                                                                        C
 5.    BASIN TO BE LEFT IN PROTECTED STATE FOR 24months (MAINTENANCE PERIOD FOR ALL BCC OWNED                                                    D01                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      2.       FUTURE VEGETATION TO COMPLY WITH THE REQUIREMENTS OF APPENDIX A OF 'HEALTHY
       BASINS) TO ALLOW SUBSTANTIAL AMOUNT OF BUILDING WORK TO BE COMPLETED IN THE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   2m2 DUMP ROCK SCOUR                                           WATERWAYS WATER SENSITIVE URBAN DESIGN' TO LOAMY SOILS. REFER LANDSCAPE
       CATCHMENT. WHEN 80% OF BUILDING WORK IN CATCHMENT IS COMPLETED THE MINIMUM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  ARCHITECTS DETAILS
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     PROTECTION (d50=0.2)




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       MAINTENANCE PERIOD CAN BE REDUCED TO 12MONTHS UPON AGREEMENT BY BCC OFFICERS.




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                                                                                                                                                                                                                                  MANHOLE




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 6.    PRIOR TO OFF MAINTENANCE INSPECTION THE PROTECTIVE LAYER/S ARE TO BE REMOVED AND A                                                                                                                                          ACCESS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 3.       CLEANOUT POINTS (INCLUDING CONCRETE SURROUND AND END CAP) TO BE PROVIDED IN




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       MINIMUM OF THREE (3) IN-SITU INFILTRATION TESTS ARE PROVIDED THAT DEMONSTRATE THAT THE                                                     B                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ACCORDANCE WITH BRISBANE CITY COUNCIL DRAFT STANDARD DRAWING UMS 153 WITH




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       HYDRAULIC CONDUCTIVITY MEETS OR EXCEEDS THE DESIGN HYDRAULIC CONDUCTIVITY (TYPICALLY                                                      D01                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               THE SECTION OF SUB-SOIL DRAIN FROM THE BEND TO THE SURFACE TO BE PROVIDED AS




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       >120MM/H).                                                                                                                                                                                                                 MANHOLE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          AN UNSLOTTED/UNPERFORATED PIPE.




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          FLUSH POINTS TO HEAD OF LINE




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                                                                                                                                                                                                                                   ACCESS




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 7.    UPON SUCCESSFUL HYDRAULIC CONDUCTIVITY TESTS AND OFF-MAINTENANCE INSPECTION THE




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          (TYPICAL)




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       FILTER IS TO BE PLANTED OUT IN ACCORDANCE WITH THE APPROVED LANDSCAPE PLANS. A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     4.       REFER DRAWING WQ03 FOR BIO BASIN TYPICAL SECTIONS.




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       FURTHER 12 MONTH MAINTENANCE SECURITY TO BE APPLIED FOR TO FILTER LANDSCAPING WORKS




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       ONLY.




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                                                                                                                                                                                                                  RL 4.60




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       FILTER MATERIAL GRADING:




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      100mm SLOTTED UPVC SUBSOIL DRAINAGE




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       FILTER MATERIAL TO HAVE HYDRAULIC CONDUCTIVITY OF 180mm/hr




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      [email protected] Crts AND GRADED @ MIN 0.5%.




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       UNDER DRAINAGE MATERIAL IS TO HAVE A MINIMUM HYDRAULIC CONDUCTIVITY OF 5000mm/hr. THE




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      CAPPED UPVC FLUSH POINTS TO BE




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       GRADING OF THE UNDER DRAINAGE GRAVEL, TRANSITION LAYER AND FILTER MEDIA SHALL COMPLY




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      INSTALLED TO CHANGE OF DIRECTIONS,




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       WITH THE FOLLOWING CRITERIA:-




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      HEADS OF ALL SUBSOIL DRAINAGE PIPES




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             D15 (TRANSITION LAYER) ≤ 5xD85 (FILTER MEDIA)




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      AND @ 30m (MAX) CTS. (TYPICAL)




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             D15 (DRAINAGE LAYER) ≤ 5xD85 (TRANSITION LAYER)




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       FILTER MEDIA PARTICLE SIZE DISTRIBUTION:




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