MCU14/0056 - Attachment H -Economic Needs Assessment

                                                                                                                                                                      Debris screen
                              INSTALLATION OF RISER PIPE          8. ANCHOR THE RISER IN PLACE BY
                                                                                                                                                                       Oil skimmer
                                                                  CONCRETE OR OTHER
                              1. DRILL DE-WATERING HOLES IN THE   SATISFACTORY MEANS TO PREVENT
                              RISER AS SPECIFIED ON THE PLAN.                                                                              150                         Perforated
                                                                  FLOTATION. ENSURE THE                   Outlet chamber barrier          (min)                        riser pipe
                              2. EXCAVATE ANTI-FLOTATION PIT.     ANTI-FLOTATION MASS IS AT LEAST         (optional)
                                                                                                                                                                       Aggregate
                                                                  110% OF WATER MASS DISPLACED BY                                                                      15 to 25 mm
                              3. SECURELY ATTACH THE RISER TO     THE RISER PIPE OUTLET SYSTEM,
                              THE CONDUIT OR CONDUIT STUB TO      INCLUDING THE VOLUME DISPLACED
                              MAKE A WATERTIGHT STRUCTURAL        BY THE ANTI-FLOTATION WEIGHT.
                              CONNECTION. SECURE ALL
                              CONNECTIONS BETWEEN CONDUIT         9. IN NO CASE SHOULD THE CONDUIT
                              SECTIONS BY APPROVED                BE INSTALLED BY CUTTING A TRENCH
                              WATERTIGHT ASSEMBLIES.              THROUGH THE DAM AFTER THE
                                                                  EMBANKMENT IS COMPLETED.
                              4. ATTACH THE ANTI-SEEP COLLARS
                              TO THE CONDUIT AS SHOWN ON THE      10. ATTACH ANTI-VORTEX DEVICE
                              APPROVED PLAN, OR OTHERWISE AS      AND TRASH GUARD TO RISER AND AS                        Anti-flotation weight
                              SPECIFIED.                          REQUIRED (REFER TO
                                                                  SPECIFICATIONS SHOWN ON THE
                              5. PLACE THE CONDUIT AND RISER      APPROVED PLANS).                   (a) Riser pipe outlet with aggregate filtration system
                              ON A FIRM, SMOOTH FOUNDATION OF
                              IMPERVIOUS SOIL. DO NOT USE                                                                                                           Debris screen
                                                                  MAINTENANCE
                              PERVIOUS MATERIAL SUCH AS SAND,                                                                                                       Oil skimmer
                              GRAVEL, OR CRUSHED ROCK AS          1. CHECK ALL VISIBLE PIPE
                              BACKFILL AROUND THE CONDUIT OR      CONNECTIONS FOR LEAKS, AND                                            150                         Riser pipe
                              ANTI-SEEP COLLARS.                  REPAIR AS NECESSARY.                                                 (min)
                                                                                                                                                                    Gabion basket
                              6. PLACE FILL MATERIAL AROUND       2. REMOVE ALL TRASH AND OTHER
                              THE CONDUIT IN 100mm LAYERS AND     DEBRIS FROM THE BASIN AND RISER.                                                                  Heavy-duty
                                                                                                        Outlet chamber barrier
                              COMPACT AROUND THE PIPE TO AT       3. SUBMERGED INFLOW PIPES MUST        (optional)                                                  needle punched
                              LEAST THE SAME DENSITY AS THE                                                                                                         filter cloth
                                                                  BE INSPECTED AND DE-SILTED (AS
                              ADJACENT EMBANKMENT. ENSURE         REQUIRED) AFTER EACH INFLOW
                              APPROPRIATE CARE IS TAKEN NOT       EVENT.
                              TO RAISE THE PIPE FROM FIRM
                              CONTACT WITH ITS FOUNDATION         REMOVAL
                              WHEN COMPACTING UNDER THE
                              PIPE HAUNCHES.                      1. DISPOSE OF ALL MATERIALS IN A
                                                                  MANNER THAT WILL NOT CREATE AN
Catchments & Creeks Pty Ltd




                              7. PLACE A MINIMUM DEPTH OF         EROSION OR POLLUTION HAZARD.
                              600mm OF LIGHTLY COMPACTED
                              BACKFILL OVER THE CONDUIT                                        (b) Riser pipe outlet with rock-filled gabion basket filter system
                              BEFORE CROSSING IT WITH
                                                                                                             Drawn:          Date:
                              CONSTRUCTION EQUIPMENT.                                                                                            Sediment Basins - Riser Pipe
                                                                                                                GMW              Feb-10 Primary Outlet System                         SB-04