1225_For Approval_A

                            Civil, Environmental &
                            Hydraulic Engineers




TYPICAL BASIN OUTLET WEIR


[OCR of page images]
 

 

 

DESIGN, INSTALLATION & MAINTENACE GUIDELINES

THE MANUAL FOR EROSION & SEDIMENT CONTROL VI.| MAROOCHY SHIRE COUNCIL HAS BEEN USED FOR THIS
PROJECT.

SEDIMENT BASIN SIZING FOR TYPE ’D’ SOILS

1, BASIN PARAMETERS

« LOCATE AWAY FROM A WATER COURSE IF POSSIBLE.

«MAX ALLOWABLE SUSPENDED SOLIDS FOR RELEASING WATER INTO STREAM IS 50mg/L

« — MINIMUM LENGTH TO WIDTH RATIO 3:1

« AIM TO TREAT DIRTY WATER WITH GYPSUM AND RELEASE TREATED CLEAN WATER WITHIN 1 TO 3 DAYS
2. BASIN SIZING

* BASIN 1— SETTLING ZONE VOLUME = 10 x 0.43 x 0.56Ha x 46.3mm = 111m>
— SEDIMENT ZONE VOLUME = 0.17 x 0.56Ha x 6000 x 0.04 x 0.72 x 1.3.x 1.0 / 1.3 = 16m?
— TOTAL BASIN VOLUME = 127m* (APPROX.SIZE 20m x 6.5m x 1.0m DEEP, 1:2 BATTERS)
Qu = 0.2m’/sec
* BASIN 2— SETTLING ZONE VOLUME = 10 x 0.43 x 0.33Ha x 46.3mm = 66m’
— SEDIMENT ZONE VOLUME = 0.17 x 0.33Ha x 6000 x 0.04 x 0.61 x 1.3.x 1.0 /1.3 = 8m?
— TOTAL_BASIN VOLUME = 74m* (APPROX.SIZE 10.5m x 4m x 1.0m DEEP, 1:2 BATTERS)
Quo = 0.14m*/sec

ONSITE EROSION & SEDIMENT CONTROL

OBJECTIVE:

TIME FROM COMMENCEMENT OF DISTURBANCE TO REHABILITATION TO BE <3 MONTHS.

CLEARANCE:

1. PLACE CLEAN WATER DIVERSION AND SEDIMENT BASINS IN PLACE BEFORE COMMENCING STRIPPING.
2. MINIMISE DISTURBANCE BEYOND EXTENT OF WORK TO 2m (Sm MAXIMUM).

3. SLASH AND STORE GRASS FOR MULCH, STRIP AND STOCK PILE TOPSOIL.

4, MULCH CLEARED VEGETATION FOR RE-USE AND STOCKPILE MULCH AND TOPSOIL AWAY FROM CONCENTRATED
STORMWATER FLOW PATHS.

5. STOCKPILE ON SITE
DIVERT OVERLAND STORMWATER AROUND STOCKPILES BY BUNDS
SILT FENCE IS TO BE PLACED ON DOWNSLOPE OF STOCKPILE

SEPERATE FROM REMAINING VEGETATION AREAS BY MINIMUM 2m.
IF STOCKPILES ARE TO BE LEFT FOR 2 WEEKS, COVER WITH GEOFABRIC OR EQUIVALENT

+
+
+
’
6. STORE EXTRA MATERIALS FOR EMERGENCY EROSION AND SEDIMENT CONTROL ON SITE (i.e. MULCH, GYPSUM,

ROCKS, GEOFABRIC, SAND BAGS).

7. \F WATER RELEASED FROM SITE IS, OR IS LIKELY TO EXCEED 5SQmg\L: TAKE FURTHER IMMEDIATE REMEDIAL
ACTION BEFRE RELEASING WATER.

8. ANY DIVERSION DRAINS WHICH DROP DOWN BATTERS MUST BE GEOTEXTILE LINED
9. EMBANKMENTS OR BATTERS NOT BEING WORKED MUST BE STABILISED IMMEDIATELY THEY ARE PREPARED.
10. STORE GYPSUM ON SITE FOR MULTIPLE BASIN FILLS.
11. HOLD POINTS FOR ESCP
* PRESTART MEETING

* SUBGRADE APPROVAL
* FINAL TRIM BASE APPROVAL

FLOCCULATION

a) TRIAL FLOCCULATION, USING GYPSUM SHALL BE APPLIED USING LEAKEY DRUM AND PUMP METHOD AT THE
RATE OF 30kg/100m’ OF STORED WATER IN THE SEDIMENT BASIN. THE RATE OF SETTLING SHALL BE MONITORED
AND THE DOSING RATE ADJUSTED ACCORDINGLY.

2.0m

 

 

 

 

 

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TYPICAL BASIN OUTLET WEIR

 

 

 

 

 

‘@—— Extend rock

 

OUTLET WEIR ]

BASIN WALL TYPICAL SECTION

SEDIMENT & EROSION CONTROL CHECK LIST

BASIN 1- 0.2m°/s AT 0.16m DEEP
BASIN 2 - 0.14m?/s AT 0.12m DEEP

pitching to
bottom of batter

Callaghan & Toth )

Civil, Environmental &
Hydraulic Engineers

PO BOX 2305

NOOSA HEADS 4567

i! 8/41 Sunshine Beach Road

= Phone 54749081

www.callaghonandtoth.com.au

 

designed | AH datum AHD DERIVED

 

drawn MM PSM 178243

 

 

checked | ADT | Origin (B.M.) RL 108.138

 

 

approved

 

 

ISSUE

MANAGEMENT COMMITMENT

 

OBJECTIVE / TARGET

Comply with all statutory regulations and maintain them
during earthworks/construction.Do not cause Enviromental
Harm. Keep TSS below target of 50mq/I

SURVEYED BY
MAX WATTERSON é& ASSOCIATES
PHONE (07) 54 426 121

_———

project

PROPOSED 9 LOT SUBDIVISION
AT 55 LAKE MACDONALD DRIVE
COOROY — ERINDALE PARK

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($$ <~r
Client

VALKEV PTY LTD

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—————————————————
title

SEDIMENT & EROSION CONTROL

PLAN 2 OF 2

_————

LOT 136 on MCH978

Parish of TEWANTIN
County of MARCH
NOOSA SHIRE COUNCIL
Locality of COOROY

 

 

SCALE

NOT TO SCALE

 

 

 

 

MANAGEMENT STRATEGY

Foreman to identify and check direction of storm water
flows. Provide diversion drains shown on the plan to divert
clean water flows away from disturbed areas.

Stage disturbance to mininise sed runoff & rill erosion.
Capture and treat turbid runoff before release to stream.

 

TASKS / ACTIONS

Erect diversions, barriers & traps as shown on the plans
before commencing earthworks or drainage improvements.
Cover disturbed areas with turf/mulch as soon as possible &
stage works to mininise exposer time.

 

PERFORMANCE
INDICATORS

Foreman to check that diversions, barrierrs and weirs are
trapping the flows after rain. Ensure no bypass of sediment
occurs. Ensure TSS target of 50mg/I up to 1 in 10 storm is
not_exceeded.

REVISIONS

revision
A |_ ISSUED FOR APPROVAL

 

FILES

 

COMPUTER DIRECTORY
X:\JOBS\CT PRJ N PRG\1225 30 LOTS LAKE MAC
DRV\DES\STG5\DES\CURRENT DWG:1225 BASE PLAI

 

 

 

FREQUENCY / DEADLINE

Foreman shall monitor & repair after every storm until grass is
80% established. Sediment shall be removed before it reaches
600mm below basin spillway, orotherwise 100mm below veir.

FOR APPROVAL

 

RESPONSIBLE PERSON

The Principal Contractors foreman shall be
responsible for inspections.

 

REPORTING / REVIEW

Foreman to keep a report of barrier repairs. Sample overflow
from dams after 25mm of rain in one day. Discuss
ammendments required with superintendent if TSS is over the
target.

 

CORRECTIVE ACTIONS

 

 

Foreman is to repair ony damaged barriers daily.

 

Ammend_structures_as_required_to_achieve_the_target_TSS.

Sheet 24 of 36 sheets
drawing number

1225-83

XK date 9th SEPTEMBER 2014 yy,