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Project Detail

Project number 911/2
Project name

Samson Brook Dam Remedial Works
Project status Current
Proponent(s) Water Corporation
Project location

State Forest 14, Hoffman 6220
Project bioregion(s) Jarrah Forest
Assessment criteria (b) it comprises the whole or a part of, or is necessary for the maintenance of, a significant habitat for fauna indigenous to Western Australia., (f) it is growing in, or in association with, an environment associated with a watercourse or wetland.
Residual impact

Loss of up to 8.4 hectares of native vegetation in excellent (Keighery 1994) condition that includes:
- foraging and potential nesting and roosting habitat for forest red-tailed black cockatoo
- significant riparian vegetation growing in association with Samson Brook.
Offset conditions

9. Offsets
(a) Determination of offsets
(i) If part or all of the clearing to be done is or may be at variance with one or more of the clearing principles, then the permit holder must implement an offset in accordance with Conditions 9(a) and 9(b) of this Permit with respect to that native vegetation.
(ii) In determining the offset to be implemented with respect to a particular area of native vegetation proposed to be cleared under this Permit, the permit holder must have regard to the offset principles contained in condition 9(b) of this Permit.
(iii) Once the permit holder has developed an offset proposal, the permit holder must provide that offset proposal to the CEO for the CEO’s approval prior to undertaking any clearing to which the offset relates, and prior to implementing the offset.
(iv) Clearing may not commence until and unless the CEO has approved the offset proposal.
(v) The permit holder shall implement the offset proposal approved under condition 9(a)(iii).
(vi) Each offset proposal shall include a direct offset, timing for implementation of the offset proposal and may additionally include contributing offsets.

(b) Offset principles
For the purpose of this Part, the offset principles are as follows:
(i) direct offsets should directly counterbalance the loss of the native vegetation;
(ii) contributing offsets should complement and enhance the direct offset;
(iii) offsets are implemented only once all avenues to avoid, minimise, rectify or reduce environmental impacts have been exhausted;
(iv) the environmental values, habitat, species, ecological community, physical area, ecosystem, landscape, and hydrology of the offset should be the same as, or better than, that of the area of native vegetation being offset;
(v) a ratio greater than 1:1 should be applied to the size of the area of native vegetation that is offset to compensate for the risk that the offset may fail;
(vi) offsets must entail a robust and consistent assessment process;
(vii) in determining an appropriate offset, consideration should be given to ecosystem function, rarity and type of ecological community, vegetation condition, habitat quality and area of native vegetation cleared;
(viii) the offset should either result in no net loss of native vegetation, or lead to a net gain in native vegetation and improve the condition of the natural environment;
(ix) offsets must satisfy all statutory requirements;
(x) offsets must be clearly defined, documented and audited;
(xi) offsets must ensure a long-term (10-30 year) benefit; and
(xii) an environmental specialist must be involved in the design, assessment and monitoring of offsets.
Statutory process EP Act Clearing (Part V)
Approved project area (ha) 8.4

Decision(s):

DECISION 1
Date: 2012-06-21 Ministerial statement: None
OFFSET 1
Condition status: Complete
Type(s): Land acquisition
Rationale:

This offset includes the acquisition of 5.7 hectares of native vegetation in a very good to excellent (Keighery 1994) condition that includes:
- native vegetation suitable as forest red-tailed black cockatoo breeding, roosting and foraging habitat; and
- riparian vegetation growing in association with Blackwood River.
 
The vegetation to be acquired is similar in condition to the clearing area. Acquisition will greatly reduce the risk of loss of the values of the offset site, helping to protect it from threatening processes such as clearing (e.g. for exempt activities) and land degradation (e.g. weeds, soil erosion, dieback etc.).
 
When combined with offset 2, a total of 6.61 hectares of native vegetation will be acquired/rehabilitated. The offsets combined are considered relevant and proportionate to the significance of the environmental values being impacted.
Security arrangements:

The offset site will be managed for conservation under the ownership of the Department of Environment and Conservation.
Governance arrangements:

Offset location:

Portion of Lot 1143 on Deposited Plan 82030, Darradup (Sussex Location 1143, Wye Road, Darradup).
Approved offset area (ha): 5.7
Bioregion(s): Jarrah Forest
Delivery agent:

CONDITION MILESTONE 1
Milestone:

Condition Milestone 1 - relates to permit condition 9(a)(iii)
 
Once the permit holder has developed an offset proposal, the permit holder must provide that offset proposal to the CEO for the CEO's approval.
Timeframe:

Prior to undertaking any clearing to which the offset relates and prior to implementing the offset.
Complete: Yes
CONDITION MILESTONE 2
Milestone:

Condition Milestone 2 - relates to permit condition 9(a)(v)
 
The permit holder shall implement the offset proposal approved under condition 9(a)(iii).
Timeframe:

For the term of the permit.
Timeframe (date): 2020-02-17
Complete: Yes
IMPLEMENTATION MILESTONE 1
Milestone:

Implementation Milestone 1 - relates to Condition Milestone 2
 
In accordance with the approved offset proposal, the permit holder is to provide funding of $31,311.35 to the Department of Environment and Conservation for the purchase of a 5.7 hectare portion of Lot 1143 on Deposited Plan 82030, Darradup.
Timeframe:

Complete: Yes
IMPLEMENTATION MILESTONE 2
Milestone:

Implementation Milestone 2 - relates to Implementation Milestone 1
 
Department of Environment and Conservation to purchase a 5.7 hectare portion of Lot 1143 on Deposited Plan 82030, Darradup.
Timeframe:

Complete: Yes
OFFSET 2
Condition status: Current
Type(s): Rehabilitation
Rationale:

This offset involves the rehabilitation of portions of State Forest 14 within close proximity of the clearing area totaling 0.91 hectares. The rehabilitation will aim to establish native vegetation that has value as foraging and potential nesting and roosting habitat for forest red-tailed black cockatoo. The rehabilitation will also aim to establish riparian vegetation.
 
When combined with offset 1, a total of 6.61 hectares of native vegetation will be acquired/rehabilitated. The offsets combined are considered relevant and proportionate to the significance of the environmental values being impacted.
 
Note: Although the rehabilitation areas are located within the boundary of the approved clearing permit footprint, these areas were disturbed historically and therefore do not represent areas to be cleared under the permit.
Security arrangements:

The offset site is located within State Forest 14, Hoffman, under the management of the Department of Environment and Conservation.
Governance arrangements:

Offset location:

Portions of State Forest 14, Hoffman
Approved offset area (ha): 0.91
Bioregion(s): Jarrah Forest
Delivery agent:

CONDITION MILESTONE 1
Milestone:

Condition Milestone 1 - relates to permit condition 9(a)(iii)
 
Once the permit holder has developed an offset proposal, the permit holder must provide that offset proposal to the CEO for the CEO's approval.
Timeframe:

Prior to undertaking any clearing to which the offset relates and prior to implementing the offset.
Complete: Yes
CONDITION MILESTONE 2
Milestone:

Condition Milestone 2 - relates to permit condition 9(a)(v)
 
The permit holder shall implement the offset proposal approved under condition 9(a)(iii).
Timeframe:

For the term of the permit.
Timeframe (date): 2020-02-17
Complete: No
IMPLEMENTATION MILESTONE 1
Milestone:

Implementation Milestone 1 - relates to Condition Milestone 2
 
In accordance with the approved offset proposal, the permit holder is to submit a revegetation plan to the Department of Environment and Conservation in relation to the revegetation of 0.91 hectares of State Forest 14.
Timeframe:

One year prior to commencement of the second stage of remedial works at Samson Brook Dam.
Complete: Yes
IMPLEMENTATION MILESTONE 2
Milestone:

Implementation Milestone 2 – relates to Condition Milestone 2 and Implementation Milestone 1
 
Water Corporation is to implement the “P134B Samson Brook Dam Remedial Works Revegetation Plan – Water Corporation P134B-01-Rev4 – November 2015” which includes, but is not limited to, the following actions:
 
Site preparation:
- soil testing and amendment where required
- weed management
- ripping and contouring
- topsoil recovery
 
Vegetation establishment:
- planting by tube stock
- direct seeding of 4 kilograms per hectare
- hydromulching
 
Monitoring:
- establishment of permanent monitoring plots and recording seed germination, seedling survival, plant development, maintenance requirements and weed impacts
 
Other:
-disease and pest control
 
Remedial actions (if completion criteria are not met):
- weed control
- infill planting
- re-seeding
 
Completion criteria:
- target density of 1 plant per 1 metre squared
- 500 tree stems per ha
- Minimal weed cover
Timeframe:

Site preparation: prior to vegetation establishment.
 
Vegetation establishment: winter 2016
 
Monitoring: spring 2016, summer 2016/17, autumn 2017, spring 2017, autumn 2018 and spring 2018.
 
Remedial actions: as required.
Complete: No

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