Original source · versioned page text
Stormwater Management Report
Attached to the e-mail Response to Information Request - MCU18/0120, RAL18/0013, OPW18/0197.
Original PDF page 22, section 1. The text section number identifies this passage in the reader.
SEDIMENT & EROSION NOTES:
1.0 GENERAL: 5.0 SITE MANAGEMENT: 7.0 EROSION CONTROL: 10.0 SEDIMENT BASIN REHABILITATION: EROSION AND SEDIMENT CONTROL CONSTRUCTION SEQUENCE:
1.1 Additional erosion and sediment control measures must be implemented and 5.1 All office facilities and operational activities must be located such that any 7.1 All erosion control measures must be applied and maintained in accordance 10.1 Required drainage, erosion and sediment control measures during the PHASE 1 - PRIOR TO EARTHWORKS:
a revised Erosion and Sediment Control Plan (ESCP) must be submitted for liquid effluent (e.g. process water, wash-down water, effluent from equipment with HR Design, local Authority and all relevant technical standards and decommissioning and rehabilitation or a sediment basin must comply with 1. CONSTRUCT ROAD ENTRY/EXIT AND SHAKER GRIDS.
approval in the event that site conditions change significantly from those cleaning, or plant watering), can be totally contained and treated within the guidelines. same standards specified for the normal construction works. 2. MARK OUT 'NO GO' AREAS
considered within the ESCP. site. 3. DIRECT CLEAN STORMWATER FLOW DIVERSIONS AROUND CONSTRUCTION AREAS.
7.2 The application of liquid-based dust suppression measures must ensure that 10.2 Upon decommissioning of a sediment basin, all water and sediment must be
4. CONSTRUCT SEDIMENT TRENCHES/BASINS. ENSURE SAFETY FENCING TO SURROUND
1.2 Additional erosion and sediment control measures must be implemented and 5.2 The construction schedule must aim to minimise the duration that any and all sediment-laden runoff resulting from such measures does not create a traffic removed from the basin prior to removal of the embankment (if any). Any
IF BATTERS STEEPER
a revised Erosion and Sediment Control Plan (ESCP) must be submitted for areas of soil are exposed to the erosive effects of wind, rain and surface water. or environmental hazard. such material, liquid or solid, must be dispose of in a manner that will not
THAN 1 IN 4 ARE USED.
approval in the event that the implemented works fail to achieve the stated 5.3 Land-disturbing activities must be undertaken in accordance with the Erosion 7.3 All temporary earth banks, flow diversion systems, and embankments create an erosion or pollution hazard.
5. TEMPORARY STOCKPILE AREAS TO BE MARKED OUT. TOPSOIL TO BE TRANSPORTED
“objective” of the ESCP, the local government ESC standard, or the State’s and Sediment Control Plan (ESCP) and associated development conditions. associated with constructed sediment basins must be machine-compacted, 10.3 A basin’s catchment conditions associated with the staged decommissioning IN DAMP CONDITION TO
environmental protection requirements. (alternative to above) seeded and mulched for the purpose of establishing a temporary vegetative of the basin from a Type 1 to a Type 2 sediment trap must comply with the
5.4 Land-disturbing activities must be undertaken in such a manner that allows all RETAIN SOIL STRUCTURE. TOPSOIL STOCKPILES TO BE LOW FLAT LONG MOUNDS.
1.3 Where there is a high probability that serious or material environmental harm reasonable and practicable measures to be undertaken to: cover within 10 days after grading. specified sediment control standard. 6. FORM AND LINE ALL DRAINAGE CHANNEL/SWALES.
may occur as a result of sediment leaving the site, appropriate additional 7.4 The construction and stabilisation of earth batters steeper than 6:1 (H:V) must 10.4 If an alternative, permanent, outlet structure is to be constructed prior to 7. CHECK DAMS TO BE LOCATED IN EXISTING SWALES, IF REQUIRED, TO CONTROL
(i) allow stormwater to pass through the site in a controlled manner and at
erosion and sediment control measures must be implemented such that all be staged such that no more than 3 vertical-metres of any batter is exposed to stabilisation of the up-slope catchment area, then this outlet structure must FLOW VELOCITIES.
non-erosive flow velocities up to the specified design storm discharge;
reasonable and practicable measures are being taken to prevent or minimise rainfall at any instant. not be made operational if it will adversely affect the required operation of the 8. SITE FENCING AND SECURITY GATES TO BE INSTALLED.
such harm. Only those works necessary to minimise or prevent environmental (ii) minimise soil erosion resulting from rain, water flow and/or wind; sediment basin.
7.5 Synthetic reinforced erosion control mats and blankets must not be placed
harm shall be conducted on-site prior to approval of the amended Erosion and (iii) minimise adverse effects of sediment runoff, including safety issues; PHASE 2 - DURING EARTHWORKS:
within, or adjacent to, riparian zones and watercourses if such materials are 10.5 The permanent stormwater treatment features (e.g. vegetation and filtration
Sediment Control Plan (ESCP). 1. ALL MEASURES FROM PHASE 1 ARE TO REMAIN IN PLACE.
(iv) prevent, or at least minimise, environmental harm resulting from work-related likely to cause environmental harm to wildlife or wildlife habitats. media) must be appropriately protected from the adverse effects of sediment
1.4 Where there is a high probability that serious or material environmental harm soil erosion and sediment runoff; runoff. 2. STRIP TOPSOIL TO STOCKPILES, PROVIDE SEDIMENT FENCE TO PERIMETER.
7.6 A minimum 60% ground cover must be achieved on all non-completed
may occur as a result of sediment leaving the site, a new or amended Erosion 3. CARRY OUT EARTHWORKS TO AREAS, IN A PHASED SEQUENCE.
(v) ensure that the value and use of land/properties adjacent to the development earthworks exposed to accelerated soil erosion if further construction activities 10.6 A sediment basin must not be decommissioned until all up-slope site
and Sediment Control Plan (ESCP) must be submitted for approval. Only 4. RESPREAD TOPSOIL FOLLOWING EARTHWORKS PHASED SEQUENCE, LEAVING IN A
(including roads) are not diminished as a result of the adopted ESC measures. or soil disturbances are likely to be suspended for more than 30 days during stabilisation measures have been implemented and are appropriately working
those works necessary to minimise or prevent environmental harm shall be ROUGHENED STATE. TOPSOIL TO BE TRANSPORTED IN DAMP CONDITIONS TO RETAIN
5.5 All erosion and sediment control measures must conform to the standards and those months when the expected rainfall erosivity is less than 60; minimum to control soil erosion and sediment runoff in accordance with the specified
conducted on-site prior to approval of the new or amended ESCP. (alternative SOIL STRUCTURE. SEED/MULCH/HYDROMULCH/TURF
specifications contained in: 70% cover within 30 days if between 60 and 100; minimum 70% cover within ESC standard.
to above) AND WATER AREAS IMMEDIATELY ON COMPLETION. AREA AROUND TEMPORARY
20 days if between 100 and 285; minimum 75% cover within 10 days if 10.7 Immediately prior to the construction of the permanent stormwater treatment
1.5 In circumstances where it is considered necessary to prepare an amended (i) the development approval condition issued by N.S.C.; and FIELD INLETS TO BE LEFT LOWER THAN
between 285 and 1500; and minimum 80% cover within 5 days if greater than device, appropriate flow bypass conditions must be established to prevent
Erosion and Sediment Control Plan (ESCP), and where the delivery of such an (ii) the approved ESCP and supporting documentation; or INLET TO FORM SEDIMENT TRAP
1500. sediment-laden water entering the device.
amended ESCP is not imminent, then all necessary new or modified erosion 5. PLACE ADDITIONAL SEDIMENT FENCE AND CONSTRUCT CUTOFF DRAINS AS
(iii) the latest version of [insert relevant document] if the standards and 7.7 A minimum 60% ground cover must be achieved on all non-completed EARTHWORKS PROGRESS.
and sediment control works must be in accordance to IECA Specification & 10.8 Immediately following the construction of the filter media of the permanent
specifications are not contained in the approved ESCP. earthworks exposed to accelerated soil erosion if further construction activities
Guide Lines. stormwater treatment device, the filter media must be covered by heavy-duty 6. AS ROADS ARE FORMED, SANDBAG WEIRS TO BE PLACED TO SLOW RUNOFF.
5.6 Any works that may cause significant soil disturbance and are ancillary to any or soil disturbances are likely to be suspended for more than 30 days during filter cloth (minimum bidum A44 or equivalent) and a minimum 200mm layer 7. FINAL LOCATION OF SEDIMENT FENCES/CUTOFF AND SAND BAG WEIRS TO BE
Upon approval of the amended ESCP, all works must be implemented in activity for which regulatory body approval is required, must not commence those months when the expected rainfall is less than 30mm; minimum 70% of earth or sacrificial filter media. Such earth and filter cloth must not be CONFIRMED ON SITE WITH
accordance with the amended plan. before the issue of that approval. cover within 30 days if between 30 and 45mm; minimum 70% cover within 20 removed from the device until suitable surface conditions being achieved SUPERINTENDENT.
2.0 LAND CLEARING: 5.7 Additional and/or alternative ESC measures must be implemented in the event days if between 45 and 100mm; minimum 75% cover within 10 days if within the basin’s catchment area.
that site inspections, the site’s Monitoring and Maintenance Program, or the between 100 and 225mm; and minimum 80% cover within 5 days if greater PHASE 3 - CIVIL CONSTRUCTION:
2.1 Land clearing must be delayed as long as practicable and must be undertaken 10.9 Immediately following the construction of the bioretention system an
regulatory authority, identifies that unacceptable off-site sedimentation is than 225mm. (alternative to above) 1. ALL MEASURES FROM PHASE 2 TO REMAIN IN PLACE.
in conjunction with development of each stage of works, unless otherwise appropriate Type 2 sediment trap must be installed in a manner to prevent
approved by HR Design & local Authority. occurring as a result of the work activities. sediment intrusion into the device. 2. MAINTAIN SANDBAG WEIRS AS REQUIRED TO LIMIT FLOWS ON ROADWAY AREAS NOT
2.2 All reasonable and practicable efforts must be taken to delay the removal of, 5.8 Additional and/or alternative ESC measures must be implemented in the event UNDER CONSTRUCTION.
10.10 The minimum sediment control standard for the protection of the permanent
or disturbance to, existing ground cover (organic or inorganic) prior to that HR Design & local Authority, identifies that unacceptable SAND BAG WEIRS TO BE REINSTATED PRIOR TO RAINFALL EVENT AS REQUIRED.FOR
stormwater treatment device during the construction and maintenance phases
land-disturbing activities. off-site sedimentation is occurring as a result of the work activities. ALL PIPELINE / SERVICE
is a Type 2 sediment trap. (alternative to above)
(alternative to above) TRENCHES EXCAVATED MATERIAL TO BE PLACED ON HIGH SIDE OF TRENCH TO
2.3 Bulk tree clearing must occur in a manner that minimises disturbance to 10.11 Plant establishment within the permanent stormwater treatment device must PREVENT RUNOFF INTRUSION INTO
existing ground cover (organic or inorganic). 5.9 Land-disturbing activities must not cause unnecessary soil disturbance if an be delayed until sediment intrusion into the device is suitably under control. OPEN EXCAVATION
2.4 Bulk tree clearing and grubbing of the site must be immediately followed by alternative construction process is available that achieves the same or 8.0 SEDIMENT CONTROL: 10.12 Upon suitable conditions being achieved within the basin’s catchment area, 3. INSTALL INLET PROTECTION (SANDBAGS OR GRAVEL FILLED FILTER FABRIC) AND
specified temporary stabilisation measures (e.g. temporary grassing, or equivalent outcomes at an equivalent cost.
8.1 All sediment control measures must be applied and maintained in accordance the operational features of the permanent stormwater treatment system must MONITOR.
mulching) prior to commencement of each stage of construction works. 5.10 Sediment (including clay, silt, sand, gravel, soil, mud, cement and ceramic with HR Design, local Authority and all relevant technical standards and be made fully operational (i.e. maintenance and/or reconstruction as 4. TURF STRIPS TO BACK OF KERB AND TO SWALES AS REQUIRED.
2.5 Disturbance to natural watercourses (including bed and banks) and their waste) deposited off the site as a direct result of an on-site activity, must be guidelines. required). 5. RESEED AND WATER ANY DISTURBED AREAS.
associated riparian zones must be limited to the minimum practicable. collected and the area appropriately cleaned/rehabilitated as soon as 6. INLET GRATES TO HAVE FILTER FABRIC PLACED OVER AND SECURED.
8.2 Optimum benefit must be made of every opportunity to trap sediment within 10.13 The permanent stormwater treatment features of the rehabilitated basin must
reasonable and practicable, and in a manner that gives appropriate 7. EARTHWORKS AREAS TO REMAIN IN ROUGHENED STATE, REINSTATE IF REQUIRED.
2.6 No land clearing shall be undertaken unless preceded by the installation of the work site, and as close as practicable to its source. not be made operational until all up-slope site stabilisation measures have
consideration to the safety and environmental risks associated with the 8. PLANTING, TURFING, MULCHING ETC. TO NOMINATED AREAS AS DETAILED ON
adequate drainage and sediment control measures, unless such clearing is been implemented and are appropriately working to control soil erosion and
sediment deposition. 8.3 Sediment traps must be installed and operated to both collect and retain LANDSCAPE ARCHITECTS
required for the purpose of installing such measures, in which case, only the sediment runoff in accordance with the specified ESC standard. (alternative to
sediment. DRAWINGS.
minimum clearing required to install such measures shall occur. 5.11 Wherever reasonable and practicable, brick, tile and masonry cutting must be above)
carried out on a pervious surface, such as grass, or open soil, or in such a 8.4 The potential safety risk of a proposed sediment trap to site workers and the
2.7 Land clearing must be limited to 5m from the edge of proposed constructed 10.14 Upon the approval of N.S.C, the newly constructed permanent stormwater
manner that all sediment-laden runoff is prevented from discharging into a public must be given appropriate consideration, especially those devices PHASE 4 - CONSTRUCTION COMPLETION:
works, 2m of essential construction traffic routes, and a total of 10m width for treatment features of the basin may be made operational if such actions do not
gutter, drain, or water body. located within publicly accessible areas. 1. ALL MEASURES FROM PHASE 3 TO REMAIN IN PLACE.
construction access, unless otherwise approved by HR Design & local prevent the site from operating at the required sediment control standard.
5.12 Adequate waste collection bins must be provided on-site and maintained such 8.5 All reasonable and practicable measures must be taken to prevent, or at least 2. MONITOR AND MAINTAIN ALL DEVICES.
Authority. (alternative to above)
that potential and actual environmental harm resulting from such material minimise, the release of sediment from the site. 3. INSPECT ALL DEVICES BEFORE AND AFTER RAINFALL EVENTS.
2.8 Prior to land clearing, areas of protected vegetation, and significant areas of waste is minimised. 4. RESEED AND WATER ANY DISTURBED AREAS.
8.6 Suitable all-weather maintenance access must be provided to all sediment
retained vegetation must be clearly identified (e.g. with high-visibility tape, or 5. SEDIMENT TRENCHES/BASINS TO BE DECOMMISSIONED AND AREAS TO BE
5.13 Concrete waste and chemical products, including petroleum and oil-based control devices. 11.0 SITE MONITORING:
light fencing) for the purposes of minimising the risk of unnecessary land REHABILITATED AS REQUIRED.
clearing. products, must be prevented from entering an internal water body, or an 8.7 Sediment control devices must be de-silted and made fully operational as 11.1 All water quality data, including dates of rainfall, dates of testing, testing 6. ROAD SIDE SWALE BIO-FILTRATION MATERIAL TO BE INSTALLED AND PLANTED OUT.
external drain, stormwater system, or water body. soon as reasonable and practicable after a sediment-producing event, whether results and dates of water release, must be kept in an on-site register. The
2.9 All reasonable and practicable measures must be taken to minimise the 7. TEMPORARY STOCKPILES AND SITE COMPOUND/OFFICE TO BE DECOMMISSIONED.
5.14 All flammable and combustible liquids, including all liquid chemicals if such natural or artificial, if the device’s sediment retention capacity falls below 75% register is to be maintained up to date for the duration of the approved works
removal of, or disturbance to, those trees, shrubs and ground covers (organic
chemicals could potentially be washed or discharged from the site, are stored of its design retention capacity. and be available on-site for inspection by Local Authority on request.
or inorganic) that are intended to be retained.
and handled on-site in accordance with relevant standards such as AS1940 8.8 Materials, whether liquid or solid, removed from sediment control devices 11.2 At nominated instream water monitoring sites, a minimum of 3 water samples
2.10 All land clearing must be in accordance with the Federal, State and local The storage and handling of flammable and combustible liquids. during maintenance or decommissioning, must be disposed of in a manner must be taken and analysed, and the average result used to determine quality.
government Vegetation Protection/Preservation requirements and/or policies.
5.15 Trenches not located within roadways must be backfilled, capped with topsoil, that does not cause ongoing soil erosion or environmental harm. 11.3 Sediment basin water quality samples must be taken at a depth no greater
2.11 Land clearing is limited to the minimum practicable during those periods and compacted to a level at least 75mm above adjoining ground level and 8.9 As-Constructed plans must be prepared for all for constructed sediment than 200mm above the level of settled sediment.
when soil erosion due to wind, rain or surface water is possible. appropriately stabilised. basins and associated emergency spillways. Such plans must appropriately 11.4 All environmentally relevant incidents must be recorded in a field log that
2.12 Land clearing must not extend beyond that necessary to provide up to eight 5.16 All stormwater, sewer line and other service trenches, not located within verify the basin’s dimensions, levels and volumes, and must be submitted to must remain accessible to all relevant regulatory authorities.
(8) weeks of site activity during those months when the expected rainfall roadways, must be mulched and seeded, other otherwise appropriately HR Design and Local Authority within 14 calender days of the construction of
erosivity is less than 100, six (6) if between 100 and 285, four (4) weeks if stabilised within 7 days after backfill. each basin.
between 285 and 1500, and two (2) weeks if greater than 1500.
5.17 No more than 150m of a stormwater, sewer line or other service trench must 8.10 Constructed sediment basins must be maintained and fully operational
2.13 Land clearing must not extend beyond that necessary to provide up to eight throughout the construction period.
12.0 SITE MAINTENANCE:
to be open at any one time.
(8) weeks of site activity during those months when the actual or average 12.1 All erosion and sediment control measures, including drainage control
5.18 Site spoil must be lawfully disposed of in a manner that does not result in 8.11 Settled sediment must be removed from sediment basins when the volume of
rainfall is less than 45mm, six (6) if between 45 and 100mm, four (4) weeks if measures, must be maintained in proper working order at all times during
ongoing soil erosion or environmental harm. the sediment exceeds the designated sediment storage volume, or the design
between 100 and 225mm, and two (2) weeks if greater than 225mm. their operational lives.
5.19 All fill material placed on site must comprise only natural earth and rock, and maximum sediment storage elevation.
(alternative to above)
12.2 All temporary erosion and sediment control measures, including drainage
is to be free of contaminants, be free draining, and be compacted in layers not
3.0 SITE ACCESS: control measures, must be fully operational and maintained in proper working
exceeding 300mm to 90% modified maximum dry density in accordance with
order at all times during the maintenance period as specified by Local
3.1 Prior to the commencement of site works, the location of the site access AS1289. 9.0 SITE REHABILITATION: Authority.
point(s) must be verified with HR Design & local Authority.
9.1 All disturbed areas identified as very low, low, medium, high, or extreme 12.3 All temporary erosion and sediment control measures, including drainage
3.2 Site access must be restricted to the minimum practical number of locations. erosion risk must be suitably stabilised within 30, 30, 20, 10 or 5 days control measures, must removed after achieving a satisfactory
3.3 Site exit points must be appropriately managed to minimise the risk of 6.0 DRAINAGE CONTROL: respectively, or prior to anticipated rainfall, whichever is the greater, from the “off-maintenance inspection” by Local Authority.
sediment being tracked onto sealed, public roadways. 6.1 All drainage control measures must be applied and maintained in accordance day that soil disturbances on the area have been finalised.
12.4 All drainage, erosion and sediment control measures must be inspected:
3.4 Stormwater runoff from access roads and stabilised entry/exit points must with HR Design, local Authority and all relevant technical standards and 9.2 A minimum 60% ground cover must be achieved on all completed earthworks
(i) at least daily (when work is occurring on-site);
drain to an appropriate sediment control device. guidelines. exposed to accelerated soil erosion within 30 days during those months when
the expected rainfall erosivity is less than 60; minimum 70% cover within 30 (ii) at least weekly (when work is not occurring on-site);
6.2 Wherever reasonable and practicable, stormwater runoff entering the site from
external areas, and non-sediment laden (clean) stormwater runoff entering a days if between 60 and 100; minimum 70% cover within 20 days if between (iii) within 24 hours of expected rainfall; and
4.0 SOIL & STOCKPILE MANAGEMENT: 100 and 285; minimum 75% cover within 10 days if between 285 and 1500;
work area or area of soil disturbance, must be diverted around or through that (IV) within 18 hours of a rainfall event of sufficient intensity and duration to cause
4.0 All reasonable and practicable measures must be taken to obtain the area in a manner that minimises soil erosion and the contamination of that and minimum 80% cover within 5 days if greater than 1500. runoff on-site).
maximum benefit from existing topsoil, including: water for all discharges up to the specified design storm discharge. 9.3 A minimum 60% ground cover must be achieved on all completed earthworks 12.5 Washing/flushing of sealed roadways must only occur where sweeping has
(i) Where the proposed area of soil disturbance does not exceed 2500m2, and 6.3 During the construction period, all reasonable and practicable measures must exposed to accelerated soil erosion within 30 days during those months when failed to remove sufficient sediment and there is a compelling need to remove
the topsoil does not contain undesirable weed seed, the top 100mm of soil be implemented to control flow velocities in such a manner than prevents soil the expected rainfall is less than 30mm; minimum 70% cover within 30 days the remaining sediment (e.g. for safety reasons). In such circumstances, all
located within areas of proposed soil disturbance (including stockpile areas) erosion along drainage paths and at the entrance and exit of all drains and if between 30 and 45mm; minimum 70% cover within 20 days if between 45 reasonable and practicable sediment control measures must be used to
must be stripped and stockpiled separately from the remaining soil. drainage pipes during all storms up to the relevant design storm discharge. and 100mm; minimum 75% cover within 10 days if between 100 and 225mm; prevent, or at least minimise, the release of sediment into receiving waters.
(ii) Where the proposed area of soil disturbance exceeds 2500m2, and the topsoil 6.4 To the maximum degree reasonable and practicable, all waters discharged and minimum 80% cover within 5 days if greater than 225mm. (alternative to Only those measures that will not cause safety and property flooding issues
does not contain undesirable weed seed, the top 50mm of soil must be during the construction phase must discharge onto stable land, in a above) shall be employed. Sediment removed from roadways must be disposed of in
stripped and stockpiled separately from the remaining topsoil, and spread as a non-erosive manner, and at a legal point of discharge. 9.4 No completed earthwork surface must remain denuded for longer than 60 a lawful manner that does not cause ongoing soil erosion or environmental
final surface soil. days. harm.
6.5 Wherever reasonable and practicable, “clean” surface waters must be diverted
(iii) In areas where the topsoil contains undesirable weed seed, the affected soil away from sediment control devices and any untreated, sediment-laden 9.5 The type of ground cover applied to completed earthworks is compatible with 12.6 Sediment removed from sediment traps and places of sediment deposition
must be suitably buried or removed from the site. waters. the anticipated long-term land use, environmental risk, and site rehabilitation must be disposed of in a lawful manner that does not cause ongoing soil
4.1 Stockpiles of erodible material that has the potential to cause environmental 6.6 During the construction period, roof water must be managed in a manner that measures. erosion or environmental harm.
harm if displaced, must be: minimises soil erosion throughout the site, and site wetness within active 9.6 Unless otherwise directed by HR Design and/or Local Authority or where 12.7 Maintenance mowing of all road shoulders, table drains, batters and other
(i) Appropriately protected from wind, rain, concentrated surface flow and work areas. directed by the approved revegetation plan, topsoil must be placed at a surfaces likely to experience accelerated soil erosion must aim to leave the
excessive up-slope stormwater surface flows. minimum depth of 75mm on slopes 4:1 (H:V) or flatter, and 50mm on slopes grass length no shorter than 50mm where reasonable and practicable.
steeper than 4:1. 12.8 Maintenance mowing must be done in a manner that will not damage the
(ii) Located at least 2m from any hazardous area, retained vegetation, or
concentrated drainage line. 9.7 The pH level (soil:water 1:5) of topsoil must be adequate to enable profile of formed, soft edges, such as the crest of earth embankments.
establishment and growth of the specified vegetation.
(iii) Located up-slope of an appropriate sediment control system.
9.9 Soil ameliorants must be added to the soil in accordance with the approved
(iv) Provided with an appropriate protective cover (synthetic, mulch or vegetative)
landscape/revegetation plans and/or soil analysis.
if the materials are likely to be stockpiled for more than 28 days.
9.10 Soil density/compaction must be adjusted prior to seeding/planting.
(v) Provided with an appropriate protective cover (synthetic, mulch or vegetative)
if the materials are likely to be stockpiled for more than 10 days during those 9.11 Temporary site stabilisation procedures must commence at least 30 days
months that have a high erosion risk. prior to the nominated site shutdown date. At least 70% stable cover of all
unstable and/or disturbed soil surfaces must be achieved prior to [insert the
(vi) Provided with an appropriate protective cover (synthetic, mulch or vegetative)
start of shutdown]. The stabilisation works must not rely upon the longevity of
if the materials are likely to be stockpiled for more than 5 days during those
non-vegetated erosion control blankets, or temporary soil binders.
months that have a extreme erosion risk.
9.12 All unstable or disturbed soil surfaces must be adequately stabilised against
4.2 A suitable flow diversion system must be established immediately up-slope of
erosion (minimum 70%) prior to commencement of use, or survey plan
a stockpile of erodible material that has the potential to cause environmental
endorsement.
harm if displaced, if the up-slope catchment area draining to the stockpile
exceeds 1500m2.
Issue Made By Date Description PROPOSED COMMERCIAL DEVELOPMENT Scale : N.T.S. NOTES:
0 PC 06/07/18 Preliminary ONLY - for DA Approval
at NO. 5 TAYLOR COURT, COOROY
REVISION
A PC 06/07/18 Issue for BA Job No.: 18-0165 1. Do not scale drawings.
2. Scale is correct at A1.
CLIENT: HASS HOLDINGS PTY LTD
Dwg No.: C05 3. Check and verify all dimensions
Designed By : B.J. WINNING BEngTech (Civil) Drawn By : PC Date : 29/05/18 prior to commencement of work.
Certified By : B.R. CROMAR BEng (Civil), MIEAust, CPEng, RPEQ, NPER Date : 11/09/18 Ph: (07) 5444 5578 Email: [email protected] SEDIMENT & EROSION NOTES
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