Updated Engineering Plans · MCU14/0067

LINDSAY CONSULTING PTY
                   LTD


[OCR of page images]
 

 

SEDIMENT AND EROSION
CONTROL DETAILS

GRATE TO BE GEOFABRIC
Z- WRAPPED.

 
   
  
   

<< SPACER BLOCK EARTH BUND CONSTRUCTION NOTES

1. BUILD WITH GRADIENTS BETWEEN 1 PERCENT AND 5S PERCENT.
2. AVOID REMOVING TREES AND SHRUBS IF POSSIBLE — WORK AROUND THEM
3. ENSURE THE STRUCTURES ARE FREE OF PROJECTIONS OR OTHER IRREGULARITIES THAT COULD IMPEDE
WATER FLOW
3. BUILD THE DRAINS WITH CIRCULAR, PARABOLIC OR TRAPEZOIDAL CROSS S
KERB INLET PROTECTION 4. ENSURE THE BANKS ARE PROPERLY COMPACTED TO PREVENT FAILURE.
NTS 5. COMPLETE PERMANENT OR TEMPORARY STABILISATION WITHIN 10 DAYS OF CONSTRUCTION.

 
   

ROLL OF NETTING FILLED
WITH 50 TO 70mm GRAVEL. —~

 

TIONS, NOT V SHAPED.

     

TRAPPED §

 

OMENT

  
      
 
 
 
  

Va / JURF STRIPS ~| \ BATTER GRADE
Wyo, / 1:2 max.
KK

“SRS A "

   

v
UNDISTURBED

AS REQUIRED Y AREA

: CHANNEL STABILISATION J"
~ “ NOTE:—
Min. GRADE 0.25%
Max. GRADE 0.75%
MUST HAVE 4 STABILISED OUTLET.
MAYBE USED AS CONTOUR DRAINS

 

  
 
 
 
 
  

TURF FLARES TO
RESTRICT SCOURING
ALONG TURF EDGE ~

TURF STRIP

BEHIND KERB _ CAN BE CONSTRUCTED WITH
Apa OR WITHOUT CHANNEL
EADIE OF ORAIN ALL BATTER GRADES
aa 2(H):1(V) MAX
ON
Ww /
/

aN a - 300'mm min
Le ' TOTTTRIRIR GR

 

 

Wipes KEI
GRASSED FILTER STRIPS L____2 metres min. —___]_ ~
NOT TO REGULAR SCALE NOTE: ONLY TO BE_USED AS TEMPORARY BANK
WHERE MAXIMUM UPSLOPE LENGTH IS 80 METRES.
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. Il is essential that the gypsum is spread evenly over the enlire surface for efficient treatment of the turbid water.

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
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%).

METHOD OF TESTING THE STORMWATER

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.

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,
pH, turbidity and temperature of the stormwater. For further details and specifications on the TPS 90-FLT please refer to Appendix B.

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
water and then hold if up fo the light. If seeing clearly through the sample is not possible, then the sample is probably above the 50 NTU level.

METHOD OF DEWATERING

The sediment basin can be dewatered as soon as the water quality criteria met (refer table below). A pump is fo be used fo 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.

STORMWATER DISCHARGE QUALITY CRITERIA

 

ACCEPTABLE TSS ACCEPTABLE PH DISSOLVED 0,

 

 

g/L 6.5 - 85 > 80%

 

 

 

 

SEDIMENT BASIN FLOCCULENT APPLICATION

 

 

   

AGENT INDICATIVE DOSAGE COMMENTS PRECAUTIONS & CONSTRAINTS MIN. REQD. ON SITE
GYPSUM 32kg/100cub.m LITTLE PH CHANGE, SLIGHT INCREASE IN | NEEDS TO BE SPREAD EVENLY ACROSS POND. } 260 kgm
SALINITY CAN CAUSE SCUM DEPOSITS IN EQUIPMENT,

 

 

 

 

 

 

 

NOTE: NOTIFY ENGINEER TO CONFIRM DOSAGES & APPLICATION PRIOR T

 

    

PPED SEDIMENT
TURF STRIPS

TYPICAL GRASS FILTER STRIP DETAIL

N.T.S.

 

 
 
  
  
 
 

SPILLWAY
150 M

150 MM MIN Ne MIN.
—4

 

AGGREGATE

 

SPACING OF CHECK DAMS ALONG CENTRELINE
AND SCOUR PROTECTION BELOW EACH CHECK
DAM TO BE SPECIFIED ON SWMP/ESCP

    

 

ROCK CHECK DAM

ROCK CHECK DAM CONSTRUCTION NOTES

1

wn

TR

   

CHECK DANS CAN BE BUILT WITH VARIOUS MATERIALS, INC SANDBAGS ANDO STRAW BALES. THE
MAINTENANCE PROGRAM SHOULD ENSURE THEIR INTEG SPECIALLY WHERE CONSTRUCTED WITH STRAW
BALES. IN THE CASE OF BALES, THIS MIGHT REQUIRE THEIR REPLACEMENT EVERY TwO TO FOUR MONTHS

TRENCH THE CHECK DAM 200 MM INTO THE GROUND ACROSS ITS WHOLE WIDTH. WHERE ROCK IS USED, FILL THE
TRENCHES TO AT LEAST 100 MM ABOVE THE GROUND SURFACE TO REDUCE THE RISK OF UNDERCUTTING.

NORMALLY, THEIR MAXIMUM HEIGHT SHOULD NOT EXCEED 600 MM ABOVE THE GULLY FLOOR. THE CENTRE SHOULD.
ACTING AS A SPILLWAY, BEING AT LEAST 150 MM LOWER THAN THE OUTER EDGES.

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

 

 

  

   

  

 

 

 

 

            

 

   
 

LINDSAY CONSULTING {7
7

RPEO 4928

PH Su 792 118

 

PRIOR EXPRESS WRITTEN CONS

THIS DRAWING REMAINS THE PROPERTY OF
LINDSAY CONSULTING PTY LTD AND IS FOR
THE SOLE USE OF THE CLIENT. NO PART
MAY BE USED IN PART OR WHOLE WITHOUT

ENT OF

LINDSAY CONSULTING PTY LTD

 

CLIENT AND PROJECT DESCRI
RON LOGAN
PROPOSED DEVELOPMENT

LOT 2 RENE STREET
NOOSAVILLE

PTION

 

DRAWING TITLE
EROSION CONTROL

 

SCALES

 

 

SURVEY DATUM

 

ASSOCIATED CONSULTANTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14-0821-C5

 

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/ A_| ORIGINAL ISSUE 27/08/14,
DIMENT FENCE.
TOPSOIL STOCKPILE

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

WATER FLOW, ROADS AND HAZARD AREAS.
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

ESCP OR SWMP TO REDUCE THE C-FACIRCUITOR TO LESS THAN 0.1
5. INSTRUCTION EARTH BANKS (STANDARD DRAWING 5-5) ON THE UPSLOPE SIDE DIVERT WATER AROUND

STOCKPILES AND SEDIMENT FENCES (STANDARD DRAWING 6-8) 1 TO 2 METRES DOWNSLOPE Fenpotar Fie

140821CP.dwg
DRAWING NOMBER SHEET] EV.