Vegetation Scan
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Additional lane to northern section of the N4 between the K67 (Ga-Rankuwa Interchange) and the R512 (Brits West Interchange), as well as upgrade of two of the interchanges North West and Gauteng Province Vegetation Scan Date: February 2016 Report drafted for: Environamic Environmental Consultants PO Box 2644 Montana Park, 0159 T: +27 (0)82 781 9454 F: +27 (0)12 548 4712 E: [email protected] Report drafted by: Copyright Copyright in all text and other matter is the exclusive property of the author. It is a criminal offence to reproduce and/or use, without written consent, any matter, technical procedure and/or technique contained in this document. Criminal and civil proceedings will be taken as a matter of strict routine against any person and/or institution infringing the copyright of the author and/or proprietors. This document may not be modified other tan by the author and when incorporated into overarching studies, it should be included in its entirety as an appendix to the main report. Indemnity This report is based on survey and assessment techniques which are limited by time and budgetary constraints relevant to the type and level of investigation undertaken. The findings, results, observations, conclusions and recommendations given in this report are based on the author’s best scientific and professional knowledge as well as available information at the time of study. Therefore, the author reserves the right to modify aspects of the report including the recommendations if and when new information may become available from ongoing research or further work in this field, or pertaining to this investigation. Although the author exercises due care and diligence in rendering services and preparing documents, she accepts no liability, and the client, by receiving this document, indemnifies the author against all actions, claims, demands, losses, liabilities, costs, damages and expenses arising from or in connection with services rendered, directly or indirectly by the author and by the use of this document. The Environmental Impact Assessment Regulations (Government Notice No. R982 of 4 December 2014), requires that certain information is included in specialist reports. The terms of reference, purpose of the report, methodologies, assumptions and limitations, impact assessment and mitigation (where relevant to the scope of work) and summaries of consultations (where applicable) are included within the main report. Other relevant information is set out below: Expertise of author: Working in the field of ecology, and in specific vegetation related assessments, since 2007; Is registered as a Professional Natural Scientist with the South African Council for Natural Scientific Professions in the field of ecology (Reg. No. 400019/11); and Has been working with plants indigenous to South Africa since 1997. Declaration of independence: Dimela Eco Consulting in an independent consultant and hereby declare that it does not have any financial or other vested interest in the undertaking of the proposed activity, other than remuneration for the work performed in terms of the National Environmental Management Act, 1998 (Act 107 of 1998). In addition, remuneration for services provided by Dimela Eco Consulting is not subjected to or based on approval of the proposed project by the relevant authorities responsible for authorising this proposed project. Disclosure: Dimela Eco Consulting undertake to disclose, to the competent authority, any material information that has or may have the potential to influence the decision of the competent authority or the objectivity of any report, plan or document required in terms of the National Environmental Management Act, 1998 (Act 107 of 1998) and will provide the competent authority with access to all information at its disposal regarding the application, whether such information is favourable to the applicant or not. Based on information provided to Dimela Eco Consulting by the client, and in addition to information obtained during the course of this study, Dimela Eco Consulting present the results and conclusion within the associated document to the best of the authors professional judgement and in accordance with best practise. _________________________________ ____2016.02.18________ Antoinette Eyssell-Knox Date SACNASP Reg. No. 400019/11 February 2016 Additional lane N4 (K67 to R512): vegetation scan EXECUTIVE SUMMARY An additional lane to the northern portion of the N4, between the K67 (Ga-Rankuwa Interchange) (km 266.3) to the R512 (Brits West Interchange) (km 238.2) is proposed. Currently, this section for the N4 comprise a single lane in each direction, with a shoulder on either side. This section is about 30km in length and the western extent is situated in the North West Province, while the eastern extent is situated in Gauteng. A second carriageway will be constructed on the northern side of this section of the N4 to form a dual carriageway road. The works will include the construction of the second carriageway with two 3.7 m wide lanes, a 1 m fast shoulder and a 2.5 m slow shoulder. Water crossings over the perennial Krokodil River and the Tolwane (Sand) River will also need to be constructed, as well as over non- perennial rivers and cement irrigation canals. All the minor storm water culverts along this section of road will be extended to accommodate the new carriageway. The proposed works will remain within the existing road reserve, so no additional land will be required. No special fencing is required. The construction will also include the upgrade of the Road P35-1 (R511) interchange. Environamic Environmental Consultants appointed Dimela Eco Consulting to scan the vegetation within the existing servitude and at the proposed interchanges for any sensitivities such as protected plant and tree species. The deliverables and methodology were as follows: Research the regional background information pertaining to this section of the N4 route such as The deliverables and methodology were as follows: Research the regional background information pertaining to this section of the N4 route such as the North West and the Gauteng Conservation Plan, vegetation types and threatened ecosystems, recent land use maps as well as aerial imagery; List the threatened or protected plant and tree species that were historically recorded in the area and that have a likelihood of colonising or persisting in the servitudes; Based on the information gathered, undertake a site survey of the servitude. The sampling areas will focus on potential sensitive areas or habitats to threatened plants (e.g. wetland, river crossings, koppies), recording protected trees and any other sensitivities that may be encountered within the road verges; Map the potential sensitivities and recommend management objectives to protect and conserve potential sensitive areas / species; and Provide the coordinates of protected trees species / threatened species recorded in the sample areas in tabulated format. The assessment entailed a literature review which included the short listing plants of conservation concern that could potentially occur along the servitude, a visit to the site and reporting. Vegetation studies should be conducted during the growing season of all plant species that may potentially occur. This may require more than one season’s survey with two visits undertaken preferably during November i February 2016 Additional lane N4 (K67 to R512): vegetation scan and February. However, due to the historical impacts within the servitude, this assessment report relied on a single site visit undertaken on the 1st of February 2016, after some summer rains has fallen, in an otherwise warm and unusually dry season. The N4 section assessed is situated within the Savanna Biome of South Africa and traverses the original extent of the Marikana Thornveld vegetation type, which is listed as an Endangered vegetation type. However, the proposed project will make use of an existing servitude and areas historically disturbed by the construction of and maintenance to the N4. The majority of the servitude comprised species poor secondary vegetation with little or no conservation potential. These low sensitivity vegetation, prior to disturbances, formed part of the Endangered Marikana Thornveld. However, due to the historical and continuous impacts on the vegetation within the servitude, the vegetation are not conservation worthy and cannot significantly contribute to the conservation of the Marikana Thornveld. Within the servitude assessed, landscape features such as the river crossings and areas with high rocky cover, were classified as being of medium sensitivity. Rocky areas occurred within a small portion of the servitude and although no plant species of conservation concern were recorded here, it does provide suitable habitat to some of the species and support a higher species diversity and was also classified as being of medium sensitivity. When these areas are cleared for construction, excavated succulents or bulbs should be replanted in the subsequent servitude. Provincially protected geophytes (Crinum lugardiae and Gladiolus species) as well as trees (Cussonia paniculata and Spirostachys africana) were recorded in or directly adjacent to the servitudes. The provincially protected species localities are also considered to be of medium sensitivity. However, these species could be removed and relocated into the resulting servitude or other suitable habitat, with authorisation from the relevant provincial authorities.