201343Ow(D) · OPW21/0107

                                                                                                                              SEDIMENT AND EROSION
                                                                                                                                 CONTROL DETAILS                                                                                                                                                                        LINDSAY CONSULTING PTY LTD




                                                                                                                                                                                                                                                                                                                      LINDSAY CONSULTING PTY
                                                                                                                                                                                                                                                                                                                                         LTD
                                                  GRATE TO BE GEOFABRIC
                                                  WRAPPED.
                                                                                                                                                                                                                                                                                                                                                                      RPEQ 4928
                                                                                                                                                                                                                                                                                                                      OFF. 2C/82 PARKER STREET, MAROOCHYDORE        PH 54 792 118
                                                                SPACER BLOCK                        EARTH BUND CONSTRUCTION NOTES                                                                                                                                                                                    THIS DRAWING REMAINS THE PROPERTY OF
                                                                                                    1. BUILD WITH GRADIENTS BETWEEN 1 PERCENT AND 5 PERCENT.                                              OVERLA                          TRAPPED SEDIMENT                                                           LINDSAY CONSULTING PTY LTD AND IS FOR
                                                                                                    2. AVOID REMOVING TREES AND SHRUBS IF POSSIBLE - WORK AROUND THEM.                                            ND FLO
 ROLL OF NETTING FILLED
 WITH 50 TO 70mm GRAVEL.
                                                                                                    3. ENSURE THE STRUCTURES ARE FREE OF PROJECTIONS OR OTHER IRREGULARITIES THAT COULD IMPEDE                             W                      TURF STRIPS                                                          THE SOLE USE OF THE CLIENT. NO PART
                                                                                                                                                                                                                                                                                                                     MAY BE USED IN PART OR WHOLE WITHOUT
                                                                                                       WATER FLOW.
                                                                                                    3. BUILD THE DRAINS WITH CIRCULAR, PARABOLIC OR TRAPEZOIDAL CROSS SECTIONS, NOT V SHAPED.                                                                                                                           PRIOR EXPRESS WRITTEN CONSENT OF
                     KERB INLET PROTECTION                                                          4. ENSURE THE BANKS ARE PROPERLY COMPACTED TO PREVENT FAILURE.
                                                                                                    5. COMPLETE PERMANENT OR TEMPORARY STABILISATION WITHIN 10 DAYS OF CONSTRUCTION.
                                                                                                                                                                                                                                                                                                                           LINDSAY CONSULTING PTY LTD
                                       NTS
                                                                                                                                                                                                                                                                                                                    CLIENT AND PROJECT DESCRIPTION

                                                                                                                             DIRECTION OF FLOW
                                                                                                                                                                                                                                                                                                                      CLOUT DESIGN
                                                                                                                                                                                                                                                                                                                      OPERATIONAL WORKS
                    OVERLA              TRAPPED SEDIMENT
                                                                                                                                                                                                            TYPICAL GRASS FILTER STRIP DETAIL                                                                         NO. 7 WILLIAM ST
                          ND FLO                                                                                                                                                                                                          N.T.S.
                                W               TURF STRIPS                                                                                                       BATTER GRADE
                                                                                                                                                                  1:2 max.                                                                                                                                            NOOSAVILLE
                                                                                               CHANNEL STABILISATION                                                             UNDISTURBED
                                                                                               AS REQUIRED                                                                       AREA
                                                                                                                         NOTE:-
                                                                                                                         Min. GRADE 0.25%
                                                                                                                         Max. GRADE 0.75%                                                                                                                                                                           DRAWING TITLE
                                                                                                                         MUST HAVE A STABILISED OUTLET.
            TURF FLARES TO
            RESTRICT SCOURING
            ALONG TURF EDGE
                                                                                                                         MAYBE USED AS CONTOUR DRAINS
                                                                                                                                                                                                                                                                                                                      SEDIMENT CONTROLS

              TURF STRIP
              BEHIND KERB                                                                                                               CAN BE CONSTRUCTED WITH
                                                                                                                      GRADIENT OF DRAIN OR WITHOUT CHANNEL
                                                   road surface
                                                                                                                      1% to 5%
                                                                                                                DIRECTION
                                                                                                                                                       ALL BATTER GRADES
                                                                                                                                                       2(H):1(V) MAX.                                                                                                SURFACE ROUGHENING                             SCALES
                                                                                                                OF FLOW

                                                                                                           150 mm min.                                     300 mm min.
                                                                                                                                                                                                                                                                            150 MM MIN.      SPILLWAY
                                                                                                                                                                                                                                                                                             150 MM MIN.
                      GRASSED     FILTER STRIPS
                            NOT TO REGULAR SCALE
                                                                                                                                    2 metres min.
                                                                                                                       NOTE: ONLY TO BE USED AS TEMPORARY BANK
                                                                                                                       WHERE MAXIMUM UPSLOPE LENGTH IS 80 METRES.

STORMWATER TREATMENT DETAILS                                                                                        EARTH BUND CUT OFF DRAIN                                                                AGGREGATE OR RECYCLED CONCRETE.                                     ROCK TRENCHED 200 MM INTO GROUND

SEDIMENT FLOCCULATION                                                                                                                                                                                                                                       FLO
The job of a flocculent is to effectively break down the dominance of the clay particles that contain a residual negative eleCIRCUITro-magnetic charge and thus allowing individual particles                                                                   W
to be drawn together and settle under gravity.                                                                                                                                                                                                                                                                      SURVEY DATUM
METHOD OF APPLICATION
Large sediment basins such as the one this site, require that the gypsum is mixed into a slurry with water and then sprayed over the surface of the turbid water in the sediment
                                                                                                                                                                                                                                                                    SPACING OF CHECK DAMS ALONG CENTRELINE
                                                                                                                                                                                                                                                                    AND SCOUR PROTECTION BELOW EACH CHECK             .
basin. It is essential that the gypsum is spread evenly over the entire surface for efficient treatment of the turbid water.                                                                                                                                        DAM TO BE SPECIFIED ON SWMP/ESCP
Generally the gypsum should be applied at a rate of about 32 kgm per 100 cubic metres of detained turbid water, as per the adjacent table.
should be calibrated after the first two storm events to assess the actual flocculent application rate and settling time required for the site.
                                                                                                                                                 The above dosing rate for the site                                                            ROCK CHECK DAM
The final application rate should be sufficiently high to permit adequate sediment sediment flocculation (less than 50 NTU) and basin dewatering within two days (48 hours) from the
                                                                                                                                                                                                                                                                                                                    ASSOCIATED CONSULTANTS
conclusion of each storm event, whilst maintaining other required water quality criteria such as pH (6.5 - 8.5) and dissolved oxygen (>80%).                                                     ROCK CHECK DAM CONSTRUCTION NOTES
                                                                                                                                                                                                 1. CHECK DAMS CAN BE BUILT WITH VARIOUS MATERIALS, INCLUDING ROCKS, LOGS, SANDBAGS AND STRAW BALES. THE
METHOD OF TESTING THE STORMWATER                                                                                                                                                                    MAINTENANCE PROGRAM SHOULD ENSURE THEIR INTEGRITY IS RETAINED, ESPECIALLY WHERE CONSTRUCTED WITH STRAW
                                                                                                                                                                                                    BALES. IN THE CASE OF BALES, THIS MIGHT REQUIRE THEIR REPLACEMENT EVERY TWO TO FOUR MONTHS.
The stormwater detained in the sediment basin will be tested at a suitable location that will be decided upon at the site. The sample should be taken at a location that has adequate
access so no sediment is resuspended while the testing is being conducted.                                                                                                                       2. TRENCH THE CHECK DAM 200 MM INTO THE GROUND ACROSS ITS WHOLE WIDTH. WHERE ROCK IS USED, FILL THE
The stormwater detained in the sediment basin will be tested with the TPS 90-FLT water quality logger. The TPS 90-FLT unit samples and records the dissolved oxygen, conductivity,                  TRENCHES TO AT LEAST 100 MM ABOVE THE GROUND SURFACE TO REDUCE THE RISK OF UNDERCUTTING.
pH, turbidity and temperature of the stormwater. For further details and specifications on the TPS 90-FLT please refer to Appendix B.                                                            3. NORMALLY, THEIR MAXIMUM HEIGHT SHOULD NOT EXCEED 600 MM ABOVE THE GULLY FLOOR. THE CENTRE SHOULD
If the TPS 90-FLT unit is not present a practical field test that approximates the required 50 NTU level is to fill a clear plastic or glass 65mm diameter soft drink bottle with the               ACTING AS A SPILLWAY, BEING AT LEAST 150 MM LOWER THAN THE OUTER EDGES.
water and then hold it up to the light. If seeing clearly through the sample is not possible, then the sample is probably above the 50 NTU level.
                                                                                                                                                                                                 4. SPACE THE DAMS SO THE TOE OF THE UPSTREAM DAM IS LEVEL WITH THE SPILLWAY OF THE NEXT DOWNSTREAM
                                                                                                                                                                                                    DAM.
METHOD OF DEWATERING
The sediment basin can be dewatered as soon as the water quality criteria met (refer table below). A pump is to be used to decant the basin with a floating inlet to prevent the
settled sediments from being removed from the basin. The pumping must cease prior to the settled sediments being drawn into the intake pipe, it is essential that materials from
the sediment layer are not discharged in the pumping process.                                                                                                                                                                                                                       STABILISE STOCKPILE
                                                                                                                                                                                                                                               .)                                   SURFACE
                                                                                                                                                                                                              EARTH BANK                    MAX                     2:1
                                                                                                                                                                                                                                           (
                                                                                                                                                                                                  FLOW                               SLOPE                                SLO
                                                                                                                                                                                                                                                                             PE
 STORMWATER DISCHARGE QUALITY CRITERIA                                                                                                                                                                                         2:1                                                (MA
                                                                                                                                                                                                                                                                                     X.)
   ACCEPTABLE       TSS            ACCEPTABLE      PH         DISSOLVED    O2


   50mg/L                             6.5 - 8.5                   > 80%                                                                                                                                                                                                             SEDIMENT FENCE
                                                                                                                                                                                                                                          TOPSOIL STOCKPILE
                                                                                                                                                                                                                                                                                                                    REVISION LIST
                                                                                                                                                                                                   TOPSOIL STOCKPILE CONSTRUCTION NOTES                                                                             A ORIGINAL ISSUE                                     20/11/20
                                                                                                                                                                                                                                                                                                                    B REVISED                                            19/01/21
 SEDIMENT BASIN FLOCCULENT APPLICATION                                                                                                                                                             1. PLACE STOCKPILES MORE THAN 2 (PREFERABLY 5) METRES FROM EXISTING VEGETATION, CONCENTRATED                     C REVISED                                            02/02/21
                                                                                                                                                                                                      WATER FLOW, ROADS AND HAZARD AREAS.                                                                            D REVISED                                            25/03/21
 AGENT          INDICATIVE         DOSAGE         COMMENTS                               PRECAUTIONS        &   CONSTRAINTS           MIN.   REQD.    ON   SITE
                                                                                                                                                                                                   2. CONSTRUCTION ON THE CONTOUR AS LOW, FLAT, ELONGATED MOUNDS.
                                                                                                                                                                                                   3. WHERE THERE IS SUFFICIENT AREA, TOPSOIL STOCKPILES SHALL BE LESS THAN 2 METRES IN HEIGHT.
                                                                                                                                                                                                   4. WHERE THEY ARE TO BE IN PLACE FOR MORE THAN 10 DAYS, STABILISE FOLLOWING THE APPROVED
  GYPSUM        32kg/100cub.m                     LITTLE PH CHANGE, SLIGHT INCREASE IN   NEEDS TO BE SPREAD EVENLY ACROSS POND.      260 kgm                                                          ESCP OR SWMP TO REDUCE THE C-FACIRCUITOR TO LESS THAN 0.10.
                                                  SALINITY                               CAN CAUSE SCUM DEPOSITS IN EQUIPMENT.                                                                     5. CONSTRUCTION EARTH BANKS (STANDARD DRAWING 5-5) ON THE UPSLOPE SIDE TO DIVERT WATER AROUND
                                                                                                                                                                                                      STOCKPILES AND SEDIMENT FENCES (STANDARD DRAWING 6-8) 1 TO 2 METRES DOWNSLOPE.
 NOTE: NOTIFY ENGINEER TO CONFIRM DOSAGES & APPLICATION PRIOR TO USE.




                                                                                                                                                                                                                                                                                                                   Computer File
                                                                                                                                                                                                                                                                                                                                                     201343OW.DWG
                                                                                                                                                                                                                                                                                                                   DRAWING NUMBER                                     SHEET   REV.

                                                                                                                                                                                                                                                                                                                                                      20-1343-F5        5 D