Flora & Fauna Survey & Ecological Assessment (pdf. 5MB)

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Flora & Fauna Survey & Ecological Assessments – 35 Water Street Wahroonga stipoides) was the main ground cover here, with significant numbers of Basket Grass (Oplismenus aemulus). Sydney Blue Gum (Eucalyptus saligna) and Rough-barked Applebox (Angophora floribunda) were scattered through the area. Morning Glory Vine (Ipomoea indica) and Wandering Jew (Tradescantia fluminensis) were noted to be invading the margins of this more natural ground cover area, and can be expected to eventually cover it completely unless suitably managed. Table 3.3: Condition of vegetation in 11 quadrats established in the BGHF Habitat Area Quadrat Cumberland Ecology 2007 UBM 2012 CT ST Sh GC CT ST Sh GC 1 40 40 100 95+ 30 80 90 98 2 0 100 70 95+ 0 100 80 99 3 0 70 95+ 95+ 0 100 95 99 4 0 50 80 80 0 100 95 99 5 0 5 100 90 0 40 100 90 6 0 90 70 95+ 50 50 99 90 7 100 a 100 70 30 a 100 60 8 0 a 100 40 10 a 100 99 9* 20 a a 90 0 60 50 90 10# 50 10 95 100 a 80 90 95 11 No equivalent quadrat a a a 90 *Quadrat 9 (2012) was equivalent to Quadrats 9 & 10 (2007). # Quadrat 10 (2012) did not align with Quadrat 10 (2007). See Figure 3.1 for locations of quadrats Key: CT = canopy trees, ST = small trees, Sh = shrubs, GC = ground covers Numbers indicate cover abundance (modified Braun Blanquet system). “a” indicates stratum absent NOTE: a colour-coded condition of bushland map has not been prepared as there is little difference between quadrats, and they would all be classified as being in ‘poor’ condition and be assigned a single colour UBM Ecological Consultants Pty Ltd Page 31
Flora & Fauna Survey & Ecological Assessments – 35 Water Street Wahroonga 3.5 Description of the Vegetation in the Proposed Subdivision Area The current Proposal is to rezone the Subject Property Lot 1 in DP 375262 at 35 Water Street from 5(a) Special Uses (Hospital) to E4 Environmental Living. This rezoning will facilitate a future subdivision to be considered by Ku-ring-gai Council under a future development application. However, for the purposes of the current Ecological Survey, each of the four (4) proposed new Lots (i.e. one [1] new Lot in Area 1 and three [3] new Lots in Area 2) has been surveyed separately (see Figure 1.3) and the potential impacts of the future subdivision proposal have been assessed to consider any loss or impact on the BGHF Habitat. The results of the flora survey in the eight (8) transects established in Area 1 and2 are presented below. Each proposed new Lot has been subdivided into the ‘Development Zone’ – i.e. where the footprint of the new residence has been proposed; and the ‘Non-development Zone’, which is located to the rear (east) of the Lot. Figure 1.4 is a preliminary sketch used to determine the area of BGHF Habitat in Area 2 on each of potential new Lots 3, 4 and 5 which is likely to be impacted (courtesy TKD Architects). The code provided for the Condition of Vegetation assumes four (4) structural strata: tall tree (canopy), small tree, shrub and ground cover. The % of exotics is estimated for each of these and entered with a slash / between. If a stratum is absent this is shown by an “a” in the relevant place. Where there are a few individuals, but less than the 5% considered necessary to form a structural stratum, “a” might be used with the % of these species that are exotic (e.g. a-80), in the relevant place. An example would be 0/a/a-20/60. NOTE: in the descriptions provided below * indicates an introduced or non-indigenous native species. AREA 1 - POTENTIAL NEW LOT 2 i) Development Zone Location: potential battle axe Lot located in south-western corner of the Property with a driveway from Water Street (see Figure 1.3) Vegetation Type: Non-bushland. Exotic garden with minor occurrences of native species: mostly planted specimens Condition of Vegetation: i) Condition north of existing building: a/100/99/99% ii) Condition south of existing building: a-100/a-100/99/70% [“a” refers to the stratum being substantially absent] Description: the area proposed as a driveway is a landscaped garden which has been overrun with weeds and horticultural escapes. In the area to the rear – proposed as a battle axe Lot - in 2006 a screening hedge of BGHF shrubs and small trees was planted along the southern and western boundary fences to provide privacy for neighbouring properties. These plantings include Sydney Blue Gum (Eucalyptus salignus); Backhousia myrtifolia; Lilly Pilli (Acmena smithii); Bleeding Heart Tree (Homalanthus populifolius); Acacia UBM Ecological Consultants Pty Ltd Page 32
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