LONMIN EASTERN PLATINUM Ltd - MARIKANA OPERATIONS
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LONMIN EASTERN PLATINUM Ltd - MARIKANA OPERATIONS SPECIALIST REPORT: SURFACE WATER PART OF THE ENVIRONMENTAL ASSESSMENT AND AUTHORISATION PROCESS FOR THE PROPOSED CONSTRUCTION OF A NEW CHROME PLANT PROJECT REFERENCE NR: 100279 REPORT REFERENCE DATE: 8 JANUARY 2018 REVISION 0.0 PREPARED BY: E-TEK CONSULTING LONMIN EASTERN PLATINUM – SURFACE WATER SPECIALIST REPORT CLIENT DETAILS: CLIENT Lonmin Eastern Platinum Limited CONTACT PERSON Alta Van Dyk: Alta Van Dyk Environmental Consultants CC Email: [email protected] CONTACT DETAILS Tel +27(0)12 940 9089 Mobile: +27(0)82 782 4005 CONSULTANT DETAILS: CONSULTANT E-TEK Consulting CONTACT PERSONS Pieter Vlok, P Harris Email: [email protected] CONTACT DETAILS Tel: +27 (0) 18 294 3652 Mobile +27 (0) 83 446 6154 P O Box 19144 POSTAL ADDRESS Noordbrug 2522 PHYSICAL ADDRESS 7 Solomon Street, Potchefstroom, South-Africa DOCUMENT CONTROL: PROJECT TITLE Lonmin EPL expansion: Surface Water Specialist Report REPORT STATUS Rev 0.0 REPORT NUMBER RPT 100279 CONTRACT - SIGN-OFF NAME SIGNATURE DATE AUTHOR P. Vlok Pr Tech (Eng) DOCUMENT P. Harris (BSc Eng) REVIEWER ACCEPTED BY APPROVED BY ELECTRONIC DISTRIBUTION HARD COPY COPY E-TEK Consulting Alta Van Dyk Environmental Consultants CC E-TEK Consulting: RPT 100279 Page 2 LONMIN EASTERN PLATINUM – SURFACE WATER SPECIALIST REPORT DECLARATIONS AND DISCLAIMER INDEPENDENCE E-TEK Consulting (Pty) Ltd (E-TEK) hereby declares that it is an independent consulting company in that it has no business, financial, personal or other interest in this project in respect of which E-TEK is appointed. Furthermore, no circumstances exist that may compromise the objectivity of E-TEK, excluding fair remuneration for work performed in connection with this surface water management plan. COMPETENCE OF PROJECT TEAM • PM Harris (B.Sc. Eng (Agric) has been practicing in the field of environmental management and engineering for the past 17 years. The focus area in his career has been the compilation and implementation of closure, rehabilitation and stormwater management plans. • P Vlok (B. Tech Engineering Civil), (B.Sc. (Water Resources)), (Pr. Tech Eng) has been practicing in the field of construction management and engineering for the past 11 years. His focus area is the design and implementation of stormwater management plans. DISCLAIMER This report has been produced by E-TEK Consulting (Pty) Ltd., (hereafter “E-TEK”) with the skill and care ordinarily exercised by a reasonable Environmental Consultant at the time the services were performed. Further, and in particular, the Services were performed by E-TEK taking into account the limits of the scope of works required by the Client, the time scale involved and the resources, including financial and manpower resources. Any and all intellectual property rights in this report remain the property of E-TEK. This report is produced exclusively for the purposes of the Client and is confidential to the Client and their assigns. E-TEK accepts no responsibility of whatsoever nature to third parties to whom this report, or any part thereof, is made known. Any third party relies upon the report at their own risk. E-TEK shall not be liable for any loss or damage caused by or arising out of circumstances over which E-TEK have no control, such as the use and interpretation of this report by the Client, its officials, their representatives or agents. Furthermore, E-TEK hereby disclaims any responsibility to the Client and others in respect of any matters outside the scope of work as agreed in the relevant proposal. None of the work performed during this project shall constitute or be represented as a legal opinion of any kind or nature, but shall be a representation of the findings. No warranties or guarantees, expressed or implied, are included in or intended by the report, except that it has been prepared in accordance with the current generally accepted practices and standards consistent with the level of care and skill exercised under similar circumstances by professional consultants or firms that perform the same or similar services. Any reference to legislation in this report should not be perceived as a substitute for the provisions of such legislation. In the event of any inconsistency between this document and such legislation, the latter would prevail. Whilst every endeavour has been made by the E-TEK to ensure that information provided is correct and relevant, this report is, of necessity, based on information that could reasonably have been sourced within the time period allocated to the assessment, and is, furthermore, of necessity, dependent on information provided by management and/or its representatives. It should, accordingly, not be assumed that all possible and applicable findings, observations and/or measures are included in this report as this report represents a sample of assessable parameters. As a subsequent event, should additional information become available, E-TEK reserves the right to amend its findings, observations, measures and executive summary. E-TEK Consulting: RPT 100279 Page 3 LONMIN EASTERN PLATINUM – SURFACE WATER SPECIALIST REPORT EXECUTIVE SUMMARY Lonmin Eastern Platinum Ltd (Marikana Operations) (Lonmin Marikana) has initiated an expansion project of the existing chrome plant. As part of the required Environmental Impact Assessment (EIA) process, a specialist study is required relating to the hydrology of the site and stormwater management infrastructure requirements. This includes the following: • Hydrology of upstream catchments and infrastructure; • A stormwater management plan (SWMP) for the proposed project which complies to all applicable legislation; • Conceptual designs of the infrastructure required for the functioning of the SWMP; • The delineation of the 1:100 yr floodlines of drainage lines impacting on the site; • The delineation of the 100m exclusion zone of drainage lines impacting on the site; • Impact assessments for: Construction-, operational- and closure phases. The following regulations described in Government Notice No. 704 Operational Guideline No. M6.1 are relevant to this site and cited in the report. • Regulation 4: Restrictions on locality; • Regulation 6: Capacity requirements of clean and dirty water systems; • Regulation 7. Protection of water resources. The Department of Water and Sanitation’s Resource Protection and Waste Management hierarchy of decision-taking is based on a precautionary principle and sets the order of priority for water and waste management decisions and/or actions. This project aims to manage surface water up to the first two levels of the hierarchy namely • Prevent or minimise pollution / contamination of water by implementing necessary management measures or strategies; • Reuse or Reclaim contaminated water in cases where complete pollution prevention was not possible. Also included in this document is a brief description of the methodology used to calculate the positions of the floodlines and all flood calculations required for the sizing of infrastructure which is identified as a minimum requirement for compliance to legislation and best practice. The optimal functioning of the stormwater management plan for the proposed chrome plant expansion is described in this document in the section dealing with the Legislative compliance aspects. Refer to the summaries in Table 1, Table 2 and Table 3 below: E-TEK Consulting: RPT 100279 Page 4 LONMIN EASTERN PLATINUM – SURFACE WATER SPECIALIST REPORT Table 1: Compliance to GN 704 regulation 4 DESCRIPTION ADHERENCE Restrictions on locality Outside the 1in100-year Floodline; Outside the 100 m Exclusion zone. Table 2: Compliance to Regulation 6: Summary of proposed infrastructure requirements PROPOSED FACILITIES CAPACITY REQUIREMENTS OF CLEAN AND DIRTY WATER SYSTEMS AND SPECIFICATIONS Silt trap Capacity per compartment: 500 m3; Silt management is required to ensure that the Barrier requirements: Waste “Type 3” requiring a capacity of the pollution control dam (PCD) is not “Class C” liner with leakage detection; compromised over time. Required licenced storage capacity: A dual silt trap is proposed to facilitate regular Total: 500 m3. maintenance although not indicated in this document. Pollution control dam (PCD) Barrier requirements: Waste “Type 3” requiring a “Class C” liner with leakage detection; Sub surface drains – confirm water table depth; 1000mm free board above spillway; Max dam depth: 3.0m (below NOC); Licenced capacity: 7700 m3 (FSL). Bundwalls Entire plant bunded to contain all dirty water and shed clean water to the environment. Table 3: Compliance to Regulation 7: Protection of water resources PROPOSED FACILITIES CAPACITY REQUIREMENTS OF CLEAN AND DIRTY WATER SYSTEMS AND SPECIFICATIONS Bunding and paving All dirty water contained in a PCD sized to handle a 1:50 yr storm event plus operational water needs; Pumping capacity to empty PCD to NOL within 24 hours; Reinforced concrete paving over entire plant footprint. Management protocol Management of the site during construction, operations and decommissioning. E-TEK Consulting: RPT 100279 Page 5 LONMIN EASTERN PLATINUM – SURFACE WATER SPECIALIST REPORT TABLE OF CONTENTS 1. TERMS OF REFERENCE ........................................................................................................................ 11 2. LEGISLATIVE REQUIREMENTS ............................................................................................................ 11 2.1. EXTRACTS FROM GN704 APPLICABLE TO THIS PROJECT ......................................................