LMDIP - Wimmers Carpark Site Planning Assessment

4. Traffic Assessment
4.1         Construction Phase
The construction of the carpark and laydown area will have minimal impact on local traffic. Gravel for the area surfacing will
be loaded at the LMDIP project site and transported 1.7km along Lake Macdonald Drive to the Wimmers site. The expected
truck movements with the delivery of gravel materials is between 20-30 loads.

4.2         Operation Phase
The traffic associated with workers vehicles has been considered in the existing Traffic Management Plan (TMP) for the
LMDIP. The existing project TMP notes the utilisation of the Lake MacDonald project site for car parking and acknowledges
that offsite car pooling / parking area / shuttle services may be required. The temporary car parking use at the Wimmers site
does not represent an increase in traffic for the project, merely a different location, which is conveniently located enroute to
the project site. The vehicle movements at this location will be managed through a Traffic Guidance Scheme (TGS).
In order to minimise any impact on the local traffic, a TGS will be implemented consisting of appropriate signage in order to
manage the vehicles both coming in and out of the Wimmers car park location.




5. Environmental Management
The works involve a small amount of earthworks and are considered low impact with:
      no vegetation clearing
      no waterway disturbance
      no MNES impacts
      no changes to approved stormwater discharge

As seen in Figure 2 the area transects a riparian buffer therefore an erosion and sediment plan will be implemented.


5.1 Erosion & Sediment Control


5.1.1       Soil Loss
An erosion risk assessment has been conducted using the Revised Universal Soil Loss Equation (RUSLE). The calculated soil
loss is then used to determine the level of sediment control required, as well as stabilisation and staging requirements.

A (predicted soil loss per hectare per year) = K x R x LS x P x C (IECA 2008)

Where:

    Parameter                                      Assigned value      Comments
    K is the soil erodibility factor                          0.05     Conservative factor applied based on lack of available
                                                                       soils information
    R is the rainfall erosivity factor                         3700    Based on table E2 of IECA
    LS is the slope length/gradient factor                     0.55    Based on a 3% slope across 56m slope length – Table
                                                                       E3 IECA
    P is the erosion control practice factor                     1.3   Default as per IECA
    C is the ground cover and management factor                    1   Default as per IECA

Therefore A = 132 t/ha/yr. Based on Table 4.4.3 of IECA this presents a VERY LOW risk rating. This figure assumes that the




REX# D26/127335 Wimmers Carpark Planning Assessment, 20 July 2026                                                     Page 6 of 13