Appendix B - OPW - Civil plans · OPW19/0082

LINDSAY CONSULTING PTY LTD




LINDSAY CONSULTING PTY
                   LTD


[OCR of page images]
 

 

 

SEDIMENT AND EROSION
CONTROL DETAILS

GRATE TO BE GEOFABRIC
WRAPPED.

   

LINDSAY CONSULTING (7;

ivfl Engineers)
RPEQ 4928

 

  
 

Cstructural
_— SPACER BLOCK EARTH BUND CONSTRUCTION NOTES

 
  

 

 
 

 

1. BUILD WITH GRADIENTS BETWEEN 1 PERCENT AND 5 PERCENT. RAPPED SEDIMENT OFF. 26/82 PARKEA/STREET, MAROGAHYDORE PH 54 792 118
ROLL OF NETTING FILLED 7 2. AVOID REMOVING TREES AND SHRUBS IF POSSIBLE — WORK AROUND THEM. . THIS DRAWING REMAINS THE PROPERTY OF
WITH 50 TO 7Omm GRAVEL 3. ENSURE THE STRUCTURES ARE FREE OF PROJECTIONS OR OTHER IRREGULARITIES THAT COULD IMPEDE , LINDSAY CONSULTING PTY LTD AND IS FOR
. 3 BULD THE DRAINS WITH CIRCULAR, PARABOLIC OR TRAPEZOIDAL CROSS SECTIONS, NOT V SHAPED THE SOLE USE OF THE CLIENT. NO PART
KERB INLET PROTECTION 4. ENSURE THE BANKS ARE PROPERLY COMPACTED TO PREVENT FAILURE. , MAY BE USED IN PART OR WHOLE WITHOUT
NTS 5. COMPLETE PERMANENT OR TEMPORARY STABILISATION WITHIN 10 DAYS OF CONSTRUCTION. PRIOR EXPRESS WRITTEN CONSENT OF

LINDSAY CONSULTING PTY LTD

 

CLIENT AND PROJECT DESCRIPTION

 

DIRECTION OF FLOW ay

  
  

TYPICAL GRASS FILTER STRIP DETAIL BRIAN WILLIAMS

 

OVER, A _—— oo — — ;
yee a ay —— Ns. VILLAS DEVELOPMENT
SOR / r

 
  
  
    

Ret <r es DR. 396 LAKE COOROIBAH RD

      
 
 
  
 

 

    
           

 

   

 

    
  
 
    

   

Vv <1
RES CHANNEL STABILISATION UNDISTURBED Tae NOOSA
SO \ er
KISSES AS REQUIRED or Y AREA Oe
a NOTE:— SELLE
Min. GRADE 0.25% LLL
Max. GRADE 0.75% LLL
STENT MUST HAVE A STABILISED OUTLET. _ EEE DRAWING TITLE
TURF FLARES) TO ® MAYBE USED AS CONTOUR DRAINS ELLE
RESTRICT SCOURING x LILLE EROSION CONTROL
ALONG TURF EDGE 2 LOEW
\ GE
Ky Y\\ CAIEE
TURE STRIP RRARRS | , ALE
BEHIND KERB oT | “ CAN BE CONSTRUCTED WITH ee
SKA | | OR WITHOUT CHANNEL
Sixx, ESSA | | 00d surface GRADIENT OF DRAIN ALL BATTER GRADES
iw SA | \ 1% to 5% 2(H):1(V) MAX. SURFACE ROUGHENING SCALES
SAAN | DIRECTION
RRS OF FLOW
yyy VYY) i
ey 150’ myo? sy 300mm min,
- SAIS et 150 MM MIN. S5q NN win
GRASSED FILTER STRIPS 2 eties min, St
NOT TO REGULAR SCALE NOTE: ONLY TO BE USED AS TEMPORARY BANK VV
WHERE MAXIMUM UPSLOPE LENGTH IS 80 METRES. to
STORMWATER TREATMENT DETAILS EARTH BUND CUT OFF DRAIN

SEDIMENT FLOCCULATION

 

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
to be drawn together and settle under gravity.

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
basin. It is essential that the gypsum is spread evenly over the entire surface for efficient treatment of the turbid water.

SURVEY DATUM

   

SPACING OF CHECK DAMS ALONG CENTRELINE
AND SCOUR PROTECTION BELOW EACH CHECK
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. The above dosing rate for the site ROCK CHECK DAM ASSOCIATED CONSULTANTS
should be calibrated after the first two storm events to assess the actual flocculent application rate and settling time required for the site.
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
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 BALES. IN THE CASE OF BALES, THIS MIGHT REQUIRE THEIR REPLACEMENT EVERY TWO TO FOUR MONTHS.
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, nis Ook LEAST 100 uM ae THE GROUND SURFACE TO REDUCE THE RISK to 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, EIR MAXIMUM HEIGHT SHOULD NOT EXCEED 600 MM ABOVE THE GULLY FLOOR. THE CENTRE SHOULD
lf 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.

. . : . . . 4. SPACE THE DAMS SO THE TOE OF THE UPSTREAM DAM IS LEVEL WITH THE SPILLWAY OF THE NEXT DOWNSTREAM

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.

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. ae NSe STOCKPILE

   

EARTH BANK wr

STORMWATER DISCHARGE QUALITY CRITERIA

 

ACCEPTABLE TSS ACCEPTABLE PH DISSOLVED 0,

 

 

REVISION LIST

50mg/L 6.5 -— 8.5 > 80% SEDIMENT FENCE A_| ORIGINAL ISSUE 21/12/17

 

 

 

 

 

 

 

TOPSOIL STOCKPILE
TOPSOIL STOCKPILE CONSTRUCTION NOTES

1. PLACE STOCKPILES MORE THAN 2 (PREFERABLY 5) METRES FROM EXISTING VEGETATION, CONCENTRATED

 

 

 

SEDIMENT BASIN FLOCCULENT APPLICATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WATER FLOW, ROADS AND HAZARD AREAS.
2. CONSTRUCTION ON THE CONTOUR AS LOW, FLAT, ELONGATED MOUNDS.

AGENT INDICATIVE DOSAGE COMMENTS PRECAUTIONS & CONSTRAINTS MIN. REQD. ON SITE 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\A