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

                              MATERIALS                                  INSTALLATION (COMPOST-FILLED SOCKS)       5. IF SEVERE SOIL EROSION OCCURS EITHER    REMOVAL
                                                                                                                   UNDER OR AROUND THE CHECK DAMS, THEN
                              ROCK: 150 TO 300mm EQUIVALENT DIAMETER,    1. REFER TO APPROVED PLANS FOR LOCATION   SEEK EXPERT ADVICE ON AN ALTERNATIVE       1. WHEN CONSTRUCTION WORK WITHIN THE
                              HARD, EROSION RESISTANT ROCK.              AND INSTALLATION DETAILS. IF THERE ARE    TREATMENT MEASURE.                         DRAINAGE AREA ABOVE THE CHECK DAMS
                                                                         QUESTIONS OR PROBLEMS WITH THE                                                       HAS BEEN COMPLETED AND DISTURBED
                              SANDBAGS: GEOTEXTILE BAGS (WOVEN           LOCATION OR METHOD OF INSTALLATION                                                   AREAS SUFFICIENTLY STABILISED TO
                                                                                                                   6. DE-SILT SEDIMENT TRAP IF THE SEDIMENT
                              SYNTHETIC, OR NON-WOVEN                    CONTACT THE ENGINEER OR RESPONSIBLE                                                  RESTRAIN EROSION, THE DAMS MUST BE
                                                                                                                   LEVEL EXCEEDS 1/3 THE CREST HEIGHT.
                              BIODEGRADABLE) FILLED WITH CLEAN           ON-SITE OFFICER FOR ASSISTANCE.                                                      REMOVED, UNLESS THE SEDIMENT TRAPS ARE
                              COARSE SAND, CLEAN AGGREGATE, OR                                                                                                TO REMAIN AS A PERMANENT FEATURE.
                                                                                                                   7. DISPOSE OF COLLECTED SEDIMENT IN A
                              COMPOST.                                   2. PRIOR TO PLACEMENT OF THE SEDIMENT     SUITABLE MANNER THAT WILL NOT CAUSE AN
                                                                         TRAP, ENSURE THE DRAINAGE CHANNEL IS      EROSION OR POLLUTION HAZARD.               2. REMOVE COLLECTED SEDIMENT AND
                              INSTALLATION (ROCK CHECK DAM)              DEEP ENOUGH TO PREVENT WATER BEING                                                   DISPOSE OF IN A SUITABLE MANNER THAT WILL
                                                                         UNSAFELY DIVERTED OUT OF THE DRAIN                                                   NOT CAUSE AN EROSION OR POLLUTION
                              1. REFER TO APPROVED PLANS FOR LOCATION
                                                                         ONCE THE CHECK DAMS ARE INSTALLED.                                                   HAZARD.
                              AND INSTALLATION DETAILS. IF THERE ARE
                              QUESTIONS OR PROBLEMS WITH THE
                                                                         3. LOCATE EACH SOCK AS DIRECTED WITHIN                                               3. REMOVE AND APPROPRIATELY DISPOSE OF
                              LOCATION OR METHOD OF INSTALLATION
                                                                         THE APPROVED PLANS, OR OTHERWISE AT                                                  ALL MATERIALS INCLUDING ANY GEOTEXTILE
                              CONTACT THE ENGINEER OR RESPONSIBLE
                                                                         SUCH A SPACING TO ACHIEVE THE REQUIRED                                               FABRIC.
                              ON-SITE OFFICER FOR ASSISTANCE.
                                                                         SEDIMENT TRAPPING OUTCOMES.
                                                                                                                                                              4. STABILISE THE DISTURBED CHANNEL WITH A
                              2. PRIOR TO PLACEMENT OF THE SEDIMENT
                                                                         4. PLACE EACH SOCK TO THE LINES AND                                                  LINING OF FABRIC AND ROCK, OR ESTABLISH
                              TRAP, ENSURE THE DRAINAGE CHANNEL IS
                                                                         PROFILE SHOWN IN THE APPROVED PLAN OR                                                VEGETATION AS APPROPRIATE.
                              DEEP ENOUGH TO PREVENT WATER BEING
                                                                         AS DIRECTED BY THE SITE SUPERVISOR.
                              UNSAFELY DIVERTED OUT OF THE DRAIN
                              ONCE THE CHECK DAMS ARE INSTALLED.
                                                                         5. ENSURE EACH SOCK EXTENDS UP THE
                                                                         CHANNEL BANKS (WHERE PRACTICAL) TO A
                              3. LOCATE EACH CHECK DAM SEDIMENT TRAP
                                                                         LEVEL AT LEAST 100mm ABOVE THE CREST
                              AS DIRECTED WITHIN THE APPROVED PLANS,
                                                                         LEVEL OF THE CHECK DAM.
                              OR OTHERWISE AT SUCH A SPACING TO
                              ACHIEVE THE REQUIRED SEDIMENT TRAPPING
                                                                         MAINTENANCE
                              OUTCOMES.
                                                                         1. INSPECT EACH CHECK DAM AND THE
                              4. IF THE CHECK DAMS ARE ALSO BEING USED   DRAINAGE CHANNEL AT LEAST WEEKLY AND
                              TO CONTROL EROSION WITHIN THE DRAINAGE                                                                                                         Pond surface area (As)
                                                                         AFTER RUNOFF-PRODUCING RAINFALL.
                              CHANNEL, THEN LOCATE EACH SUCCESSIVE
                              CHECK DAM SUCH THAT THE CREST OF THE       2. CORRECT ALL DAMAGE IMMEDIATELY. IF
                              IMMEDIATE DOWNSTREAM DAM IS LEVEL WITH     SIGNIFICANT EROSION OCCURS BETWEEN
                              THE CHANNEL INVERT AT THE IMMEDIATE        ANY OF THE CHECK DAMS, THEN CHECK THE
                              UPSTREAM CHECK DAM.                        SPACING OF THE DAMS AND WHERE
                                                                         NECESSARY INSTALL INTERMEDIATE CHECK
                              5. CONSTRUCT EACH CHECK DAM TO THE         DAMS OR A SUITABLE CHANNEL LINER.
                              DIMENSIONS AND PROFILE SHOWN WITHIN
                              THE APPROVED PLAN.                         3. CHECK FOR DISPLACEMENT OF THE CHECK
                                                                         DAMS.
                              6. WHERE SPECIFIED, THE CHECK DAMS MUST
                              BE CONSTRUCTED ON A SHEET OF               4. CHECK FOR SOIL SCOUR AROUND THE
Catchments & Creeks Pty Ltd




                              GEOTEXTILE FABRIC USED AS A DOWNSTREAM     ENDS OF EACH CHECK DAM. IF SUCH
                              SPLASH PAD.                                EROSION IS OCCURRING, CONSIDER                 Figure 1 - Placement of check dam sediment traps
                                                                         EXTENDING THE WIDTH OF THE CHECK DAM
                              7. EACH CHECK DAM MUST BE EXTENDED UP      TO AVOID SUCH PROBLEMS.
                              THE CHANNEL BANK (WHERE PRACTICABLE)
                              TO AN ELEVATION AT LEAST 150mm ABOVE THE                                                       Drawn:       Date:
                              CREST LEVEL OF THE DAM.                                                                          GMW         Apr-10 Check Dam Sediment Trap CDT-01