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Hydrology Management Monitoring Plan

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Hydrology Management Monitoring Plan Hydrology Assessment Lot 6 Banksia Road and Lots 300 and 301 Boomerang Road, Oldbury - 4.0 SURVEYING 4.1 Objectives and Scope This section provides information on surveying that was conducted at the L120 Wetland. The purpose of the surveying was to determine the elevation of the open drains (and other features) relevant to wetland hydrology, and hence to determine the potential controlling impact of the drains on wetland water levels. The surveying was conducted on 28 August 2012. Water (approximately 5 to 10 cm deep) was visibly flowing from the groundwater drain along the southern railway embankment, down to the eastern drain and into the eastern side of the L120 Wetland. Water within the wetland (approximately 10 cm water) was connected to the drain directly south (approximately 30 cm deep), which in turn was connected to water in the major drain further to the south. Although water was present and connected in the wetland and southern drains, it was not visibly flowing. The surveying was conducted with elevations calculated to a temporary datum (not Australian Height Datum) in order to compare relative levels between the drain and wetland bases. A total of 62 survey points were measured, which included visibly low points of the wetland, open drains and surrounding paddocks. Figure 7 shows the survey locations and Figure 8 shows the elevations relative to a temporary benchmark. 4.2 Survey Results 4.2.1 Overview This section provides details of relative ground elevations for the wetland, drains and other relevant features. Full survey results, including statistics, are provided in Appendix 5. 4.2.2 North-east Drain The groundwater drain located along the southern edge of the railway embankment to the north-east of the L120 Wetland controls groundwater flow from the north before discharging to the open drain along the eastern edge of the wetland. The RL of the drain discharge point is 4.83 m (Point 1 on Figure 7). L09864, Rev 3, December 2012 Page 21 Hydrology Assessment Lot 6 Banksia Road and Lots 300 and 301 Boomerang Road, Oldbury - Figure 7: Survey Labels L09864, Rev 3, December 2012 Page 22 Hydrology Assessment Lot 6 Banksia Road and Lots 300 and 301 Boomerang Road, Oldbury - Figure 8: Surveying Relative Levels L09864, Rev 3, December 2012 Page 23 Hydrology Assessment Lot 6 Banksia Road and Lots 300 and 301 Boomerang Road, Oldbury - 4.2.3 Eastern Drain The groundwater from the north-east drain discharges into a livestock watering area, which in turn migrates through a groundwater drain to discharge to the eastern side of the L120 Wetland. Eastern drain elevations (five locations) ranged from 3.52 m at the livestock watering area down to 2.22 m adjacent to the eastern edge of the L120 Wetland. Note that the survey locations on Figure 7 (Points 2 to 5, 64) appear slightly east of the drain; this is likely due to handheld GPS error. In reality the survey locations were taken within the drain itself. 4.2.4 L120 Wetland Wetland ground elevations for 21 locations ranged from 1.28 m to 2.27 m, with a median of 1.39 m and mean of 1.50 m. All of the wetland ground elevations (except for one in a raised area) are lower than those in the eastern drain, confirming that water flows from the eastern drain to the wetland, as was visibly identified on 28 August 2012. 4.2.5 Southern Drain Elevations of the drain that runs from the south of the wetland down to the major drain (four locations – Point 13, 14, 17, 18) ranged from 1.01 m to 1.17 m, with a median of 1.15 m and mean of 1.12 m. All elevations in this drain are lower than wetland elevations, indicating it controls water levels in the wetland. The survey locations on Figure 7 appear slightly east of the drain, which is likely due to handheld GPS error. 4.2.6 Main Drain The southern drain runs down to the major drain that in turn runs to the east south- east. Correspondence with Water Corporation confirms that water in this major drain flows from west to east, finally terminating in the Peel Main Drain. Elevations of the main drain (five locations) ranged from 0.54 m (at the culvert under the railway, Point 38) to 0.98 m, with a median of 0.89 m and mean of 0.83 m. All elevations in the main drain are lower than wetland elevations, indicating it controls water levels in the wetland. The survey locations on Figure 7 appear slightly north of the drain, which is likely due to handheld GPS error. 4.2.7 Paddock Paddock elevations between the wetland and main drain are typically higher than the wetland and drain. Paddock elevations (13 locations) ranged from 1.43 m to 1.83 m, with a median of 1.53 m and mean of 1.58 m. L09864, Rev 3, December 2012 Page 24 Hydrology Assessment Lot 6 Banksia Road and Lots 300 and 301 Boomerang Road, Oldbury - 4.2.8 Embankment Drainage Area and Access Track A railway embankment drainage area is located directly south of the railway embankment and directly north of an access track, to the north of the L120 Wetland. Embankment drainage area elevations (four locations) ranged from 1.59 m to 1.92 m, with a median of 1.73 m and mean of 1.74 m. Access track elevations (nine locations) ranged from 1.44 m to 3.06 m, with a median of 1.89 m and mean of 1.91 m. These elevations are typically higher than those of the wetland. 4.2.9 Summary Graph 1 shows the relative elevation of various areas including the wetland and drains. 5 r • • Northeast Drain 4.5 • Eastern Drain - • Wetland Southern Drain 4 • ,_ ... Main Drain ■ Paddock 3.5 . • Embankment Drainage ... Track I 3 • .. 2.5 • - • • 2 ... - • ••• • ................ - •• •• •• .... 1.5 -• ... Relative Level (m) ••••••••••••• ■■---- 1 ' ••• - ........... - 0.5 - . 0 - Graph 1: Relative Elevations As can be seen on Graph 1, the major drain and southern drain elevations are lower than the L120 Wetland elevations, indicating that water levels in the wetland will be controlled by the drains. This is particularly so for any increases in wetland water levels, which groundwater modelling has predicted may occur due to the proposed quarrying activities to the north of the railway line. L09864, Rev 3, December 2012 Page 25 Hydrology Assessment Lot 6 Banksia Road and Lots 300 and 301 Boomerang Road, Oldbury - This page is intentionally blank. L09864, Rev 3, December 2012 Page 26 Hydrology Assessment Lot 6 Banksia Road and Lots 300 and 301 Boomerang Road, Oldbury - 5.0 ADDITIONAL INVESTIGATIONS 5.1 Hydrology Peer Review JDA Consultant Hydrologists (JDA) was commissioned by RPS to undertake a professional review of the Hydrology Assessment. The objective of the review was to provide independent advice on the conclusions of the RPS report, namely that: The proposed quarry is not expected to decrease water levels in the wetland, while any increase in groundwater and wetland levels is expected to be controlled by the drains in the immediate vicinity. In relation to present conditions, the proposed quarry’s predicted impact to the quality and quantity of the L120 Wetland is expected to be significantly overshadowed by the anthropogenic impacts that already exist. In addition, the JDA review included an assessment of the L120 Wetland in relation to the characteristics of a Tumulus or Mound Spring. JDA (2012) endorsed the general conclusion of the RPS report and stated that the wetland does not conform to the hydrogeological definition of a Tumulus or Mound Spring, in that it is located in a local topographic depression with no evidence of peat or sand mounding. JDA also stated there is no sign of coarse material having been brought to the surface by groundwater discharge via preferred pathways. JDA concluded that the slight predicted increase in water levels at the L120 Wetland forecast by the RPS computer model would be beneficial rather than otherwise, being superimposed on regionally declining water-levels in the general range of 1.0 – 1.5 m since the mid 1980s. The report also noted that water levels in the wetland are ultimately controlled by long-established drains on the south and southeast side, which would limit any significant rise in water-level and that these drains adequately define the boundaries of the local shallow groundwater flow system in the vicinity of the L120 wetland. The JDA (2012) report is provided in Appendix 6. 5.2 Vegetation Assessment Mattiske Consulting Pty Ltd was commissioned by RPS to undertake a reconnaissance survey of the L120 Wetland and adjacent wetland area to the north of the railway line (Mattiske Consulting 2012). The outcomes of the vegetation assessment include: . The preliminary assessment and comparison of vegetation within the L120 Wetland and the adjacent wetland to the north of the railway line suggests that these areas were once part of a larger contiguous wetland system. L09864, Rev 3, December 2012 Page 27 Hydrology Assessment Lot 6 Banksia Road and Lots 300 and 301 Boomerang Road, Oldbury - . Wetland L120 and the wetland north of the railway line both comprise typical Serpentine River Complex associations, with species and structure conforming to those detailed within Supergroup 2: Seasonal Wetlands (Bassendean landform types). Information gathered in the preliminary field assessment of the L120 Wetland and wetland area north of the railway line suggests that hydrological factors rather than botanical values should be used as the primary determinant for the presence/absence of a Tumulus Spring.
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