Proposed Construction of a Pedestrian Bridge at Kya Sands Informal Settlement, Gauteng Province
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PROPOSED CONSTRUCTION OF A PEDESTRIAN BRIDGE AT KYA SANDS INFORMAL SETTLEMENT, GAUTENG PROVINCE. ECOLOGICAL SURVEY REPORT AUGUST 2014 ENVIRONMENTAL, OHS AND SOCIAL CONSULTANTS P.O. BOX 1673 147 Bram Fischer Drive Phone: (011) 781 1730 SUNNINGHILL FERNDALE Fax: (011) 781 1731 2157 Randburg Email: [email protected] Copyright Nemai Consulting 2014 Proposed Construction of a pedestrian bridge at Kya Sands informal settlement, Gauteng Province. August 2014 EXECUTIVE SUMMARY City of Johannesburg (CoJ) has appointed Nemai Consulting as its Independent Environmental Consultant to undertake Environmental Authorisation for the proposed construction of a pedestrian bridge in the informal settlement of Kya Sands, Gauteng province. Kya Sands is located approximately 15km North West of the Sandton Central Business District (CBD) and about 3km directly north of the intersection of Malibongwe Drive and Witkoppen Road. The settlements can be accessed by either Agnes Avenue, Bloubosrand or Kya Sand Road. Kya Sands lies on both sides of the North Riding Stream (also known as the Kya Sandspruit depending on the source). It is closely bordered by the Kya Sand industrial area to the west, the Bloubosrand residential suburb to the east, the Hoogland industrial area to the south (separated by the old Randburg landfill site) and mostly small holdings to the north. The privately owned sections of the settlement lie on the western side of the stream. CoJ is the owner of the land immediately adjacent to the stream and the property containing the old Randburg Landfill site (Portion 46 of Houtkoppen 193-IQ). The river cannot be crossed during periods of heavy rain. The river fills up and people try crossing it and get swept away by the current. This often results in death and or injury. The local kids are forced to cross the river to get school and this is not safe. Furthermore if they do not cross the river they have to walk around the river which is very long and time consuming. This is why a bridge is required, for the purpose of safe travel from one side of the river to the other. CoJ have considered two alternative sites for the proposed bridge location. The preferred option is approximately 60m in length and 2m in width and the alternative option (Alternative 1) is approximately 48m in length and 2m wide. The reason for the preference of the longer bridge (Preferred option) is because the concrete foundations of the bridge are placed outside the floodlines of the river. The objective of this study was to identify sensitive species and their habitats in the proposed construction of a pedestrian bridge at Kya Sands informal settlement, Ecological Survey ii Proposed Construction of a pedestrian bridge at Kya Sands informal settlement, Gauteng Province. August 2014 Gauteng Province. Potential faunal habitats were investigated in the study area and all mammals, birds, and reptiles known to occur on site or seen on site were recorded. Red data species (both fauna and flora) that are known to occur on site were investigated. The current ecological status and conservation priority of vegetation on the site were also assessed. The study area falls within the grassland biome and has been categorised as consisting of the Egoli Granite Grassland vegetation unit. This vegetation type is listed as Endangered. According to data sourced from South African National Biodiversity Institute (SANBI), one Threatened Terrestrial Ecosystem was recorded within the proposed development site- Egoli Granite Grassland. This ecosystem is listed as Endangered and approximately 3% of this ecosystem is protected in Diepsloot and Melville Koppies Nature Reserves (Mucina et al., 2006). Gauteng Department of Agriculture and Rural Development (GDARD) identified areas that are considered as irreplaceable sites as those areas that are essential in meeting targets set for the conservation of biodiversity. Options for achieving these targets will be reduced should the site not be protected. An “irreplaceable “designation on an area usually implies the presence of red data species, endemic species or potential habitat for these species. According to the Gauteng Conservation Plan 3.3 “Ecological Support Area” and “Important Area” categories are represented within the study area. The riparian zones presently suffer considerable degradation and transformation, which is largely due to the immediate surrounding land use of an informal settlement area. Dumping of rubbles and domestic refuse, animal carcasses and perpetual contamination by raw sewerage all were contributing factors to the overall poor state of the two sites. Alien invasive plant species within the study area were observed to occur in clumps, scattered distributions or as single individuals on site. Invader and weed species must be controlled to prevent further infestation and it is recommended that all individuals of invader species (Especially Category 1) must be removed and eradicated (Henderson, 2001). Species such as Melia azedarach, Salix babylonica, Solanum mauritianum, and Ricinus communis were common on the two proposed sites. Given that the Red Data plant species was observed, it is important Ecological Survey iii Proposed Construction of a pedestrian bridge at Kya Sands informal settlement, Gauteng Province. August 2014 that a qualified professional should be on site prior to construction to identify other species of conservation importance which may occur on site. Two (2) mammal species were visually observed on site, namely the Four-striped grass mouse and Bushveld gerbil. The residents around the proposed development sites were also consulted to provide species that are found near their properties. The study area is not in a pristine condition, and so it is unlikely that development would have an effect on the mammals species recorded during the field assessment. The majority of larger mammal species are likely to have moved away from the area as a result of habitat alteration and/or degradation. The proposed development activities are not thought to have any significant impacts on the overall conservation of mammalian diversity within the area. Existing conservation and planning tools were reviewed for relevancy in terms of the project area, and it was found that the study area did not contain or form part of any Important Bird Area (IBA). IBAs form a network of sites, at a biogeographic scale, which are crucial for the long-term viability of naturally occurring bird populations. An avifaunal study indicated that the riparian habitats should provide natural habitats for bird species. Bird species visually recorded during the field survey are common and widespread. As part of the mitigations measures, construction should be limited to the periods outside of the breeding seasons and the construction footprint should remain as localised in extent as possible and any impacted grassland areas utilised as construction support areas must be rehabilitated and re-vegetated with local grass species. The riparian zones presently suffer considerable degradation and transformation, which is largely due to the immediate surrounding land use of an informal settlement area. Dumping of rubbles and domestic refuse, animal carcasses and perpetual contamination by raw sewerage all were contributing factors to the overall poor state of the two sites. Large areas surrounding the site have resulted in increased habitat modification and transformation as well as increased human presence and associated disturbances (illegal reptile collecting, indiscriminate killing of all snake species, frequent fires) surrounding the site coupled with increased habitat destruction and disturbances on the neighbouring properties are all causal factors in Ecological Survey iv Proposed Construction of a pedestrian bridge at Kya Sands informal settlement, Gauteng Province. August 2014 the alteration and disappearance of reptile diversity in the area (Jacobsen, 2005). No reptile species were recorded on site. Generally, the negative impacts to the receiving environment resulting from the proposed development are probably of an acceptable significance and magnitude if appropriate mitigations measures are implemented and construction is implemented in a sensitive manner. The proposed development will cause disruption during the construction phase, but as long as mitigation measures are implemented, these disruptions should have minimal lasting effect on the ecosystems of the proposed development. From an ecological point of view, the proposed development should proceed. Owing to the overall degradation of the habitats at both sites and the similarities shared by both sites, there are not significant differences between the sites and therefore there is not preference to one site being more suitable that the other. Ecological Survey v Proposed Construction of a pedestrian bridge at Kya Sands informal settlement, Gauteng Province. August 2014 TABLE OF CONTENTS EXECUTIVE SUMMARY ............................................................................................................................ ii TABLE OF CONTENTS .............................................................................................................................. vi LIST OF FIGURES .................................................................................................................................... vii LIST OF TABLES ...................................................................................................................................... vii LIST OF