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Appendix D - Erosion and Sediment Control Plan
Attached to the e-mail Operational Works Application - DA Form 1 - Town Planning Report - Global Stability Assessment Report - Earthworks Compaction Report - Erosion and Sediment Control Plan - 36 Tunba Court Cooroy Mountain.
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[OCR of page images]
MATERIALS
FIBRE ROLLS: TYPICALLY 200 TO 250mm
JUTE, COIR OR STRAW ROLL TIED WITH
SYNTHETIC OR BIODEGRADABLE MESH.
STAKES: MINIMUM 25 x 25mm TIMBER
STAKES.
INSTALLATION
1. REFER TO APPROVED PLANS FOR
LOCATIONAND INSTALLATION DETAILS.
IF THERE ARE QUESTIONS OR PROBLEMS
WITH THE LOCATION, DIMENSIONS OR
METHOD OF INSTALLATION CONTACT THE
ENGINEER OR RESPONSIBLE ON-SITE
OFFICER FOR ASSISTANCE.
2. WHEN PLACED ACROSS
NON-VEGETATED OR NEWLY SEEDED
SLOPES, THE ROLLS MUST BE PLACED
ALONG THE CONTOUR.
3. IF PLACED ON OPEN OR LOOSE SOIL,
ENSURE THE FIBRE ROLLS ARE
TRENCHED 75 TO 125mm IN SANDY SOILS
AND 50 TO 75mm IN CLAYEY SOILS.
4. ENSURE THE OUTER MOST ENDS OF
THE FIBRE ROLLARE TURNED UP THE
SLOPE TO ALLOW WATER TO
ADEQUATELY POND UP-SLOPE OF THE
ROLL, AND TO MINIMISE FLOW
BYPASSING.
5. WHEN PLACED ACROSS THE INVERT
OF MINOR DRAINS, ENSURE THE SOCKS
ARE PLACED SUCH THAT.
(i) THE CREST OF THE DOWNSTREAM
ROLL IS LEVEL WITH THE CHANNEL
INVERT AT THE IMMEDIATE UPSTREAM
SOCK (IF ANY);
(ii) EACH ROLL EXTENDS UP THE
CHANNEL BANKS SUCH THAT THE CREST
OF THE FIBRE ROLLAT ITS LOWEST
POINT IS LOWER THAN THE GROUND
LEVELAT EITHER END OF THE ROLL.
6. ENSURE THE ANCHORING STAKES ARE
DRIVEN INTO THE END OF EACH ROLL
AND ALONG THE LENGTH OF EACH ROLL
ATASPACING NOT EXCEEDING 1.2m OR
SIX TIMES THE ROLL DIAMETER,
WHICHEVER IS THE LESSER. A MAXIMUM
STAKE SPACING OF 0.3m APPLIES WHEN
USED TO FORM CHECK DAMS.
7. ADJOINING ROLL MUST BE OVERLAP AT
LEAST 450mm, NOT ABUTTED.
MAINTENANCE
4. INSPECT ALL FIBRE ROLLS PRIOR TO
FORECAST RAIN, DAILY DURING
EXTENDED PERIODS OF RAINFALL,
AFTER SIGNIFICANT RUNOFF
PRODUCING STORMS OR OTHERWISE AT
WEEKLY INTERVALS.
2. REPAIR OR REPLACE DAMAGED FIBRE
ROLLS.
3. REMOVE COLLECTED SEDIMENT AND
DISPOSE OF INA SUITABLE MANNER
THAT WILL NOT CAUSE AN EROSION OR
POLLUTION HAZARD.
REMOVAL
1. ALL EXCESSIVE SEDIMENT TRAPPED
BY THE ROLLS MUST BE REMOVED FROM
THE DRAIN OR SLOPE IF SUCH SEDIMENT
IS LIKELY TO BE WASHED AWAY BY
EXPECTED FLOWS.
2. DISPOSE OF COLLECTED SEDIMENT IN
A SUITABLE MANNER THAT WILL NOT
CAUSE AN EROSION OR POLLUTION
HAZARD.
3. THE BIODEGRADABLE CONTENT OF
THE STRAW ROLLS MAY NOT
NECESSARILY NEED TO BE REMOVED
FROM THE SITE.
4. ALL SYNTHETIC (PLASTIC) MESH OR
OTHER NON READILY BIODEGRADABLE
MATERIAL MUST BE REMOVED FROM THE
SITE ONCE THE SLOPE OR DRAIN IS
STABILISED, OR THE ROLLS HAVE
DETERIORATED TO A POINT WHERE THEY
ARE NO LONGER PROVIDING THEIR
INTENDED DRAINAGE OR SEDIMENT
CONTROL FUNCTION.
Collected sediment
Figure 1 - Typical installation of fibre rolls
Fibre rolls recessed
50 to 75 mm in clayey soils,
or 75 to 125 mm in sandy soils
Drawn: ate:
GMW | Apr-10 | Fibre Rolls
FR-01
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