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RFI 9.3.20 - Attachment B - Revised Engineering plans · OPW19/0082
Plans and drawings: the text below has words only, no drawings.
SEDIMENT AND EROSION
CONTROL DETAILS
GRATE TO BE GEOFABRIC LINDSAY CONSULTING PTY LTD
WRAPPED.
LINDSAY CONSULTING PTY
LTD
SPACER BLOCK EARTH BUND CONSTRUCTION NOTES RPEQ 4928
1. BUILD WITH GRADIENTS BETWEEN 1 PERCENT AND 5 PERCENT. OVERLA TRAPPED SEDIMENT
OFF. 2C/82 PARKER STREET, MAROOCHYDORE PH 54 792 118
2. AVOID REMOVING TREES AND SHRUBS IF POSSIBLE - WORK AROUND THEM. ND FLO THIS DRAWING REMAINS THE PROPERTY OF
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 LINDSAY CONSULTING PTY LTD AND IS FOR
WATER FLOW. THE SOLE USE OF THE CLIENT. NO PART
3. BUILD THE DRAINS WITH CIRCULAR, PARABOLIC OR TRAPEZOIDAL CROSS SECTIONS, NOT V SHAPED.
KERB INLET PROTECTION 4. ENSURE THE BANKS ARE PROPERLY COMPACTED TO PREVENT FAILURE.
5. COMPLETE PERMANENT OR TEMPORARY STABILISATION WITHIN 10 DAYS OF CONSTRUCTION.
MAY BE USED IN PART OR WHOLE WITHOUT
PRIOR EXPRESS WRITTEN CONSENT OF
NTS LINDSAY CONSULTING PTY LTD
CLIENT AND PROJECT DESCRIPTION
DIRECTION OF FLOW
OVERLA
TYPICAL GRASS FILTER STRIP DETAIL BRIAN WILLIAMS
ND FLO
W
TRAPPED SEDIMENT
TURF STRIPS BATTER GRADE N.T.S. VILLAS DEVELOPMENT
1:2 max.
396 LAKE COOROIBAH RD
CHANNEL STABILISATION
AS REQUIRED
UNDISTURBED
AREA
NOOSA
NOTE:-
Min. GRADE 0.25%
Max. GRADE 0.75%
MUST HAVE A STABILISED OUTLET. DRAWING TITLE
TURF FLARES TO MAYBE USED AS CONTOUR DRAINS
RESTRICT SCOURING
ALONG TURF EDGE EROSION CONTROL
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 SURVEY DATUM
to be drawn together and settle under gravity.
METHOD OF APPLICATION SPACING OF CHECK DAMS ALONG CENTRELINE
.
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 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 ASSOCIATED CONSULTANTS
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
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
E SLO
FLOW SLOP PE
STORMWATER DISCHARGE QUALITY CRITERIA 2:1 (MA
X.)
ACCEPTABLE TSS ACCEPTABLE PH DISSOLVED O2
REVISION LIST
50mg/L 6.5 - 8.5 > 80% SEDIMENT FENCE A ORIGINAL ISSUE 21/12/17
TOPSOIL STOCKPILE C REVISED
D REVISED
30/09/19
26/02/20
TOPSOIL STOCKPILE CONSTRUCTION NOTES
SEDIMENT BASIN FLOCCULENT APPLICATION 1. PLACE STOCKPILES MORE THAN 2 (PREFERABLY 5) METRES FROM EXISTING VEGETATION, CONCENTRATED
WATER FLOW, ROADS AND HAZARD AREAS.
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
171687-CP.DWG
DRAWING NUMBER SHEET REV.
17-1687-C7 7 D
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