(5) The HEMP must address the matters set out in the approved CEMP that are relevant to the  operation and maintenance of the authorised development, and must contain—  (6) The authorised development must be operated and maintained in accordance with the  HEMP.  5. —(1) The authorised development must be landscaped in accordance with a landscaping  scheme which sets out details of all proposed hard and soft landscaping works and which has been  submitted to and approved in writing by the Secretary of State, following consultation with the  relevant planning authority on matters related to its function.  (2) The landscaping scheme must reflect the mitigation measures set out in the REAC and must  be based on the illustrative environmental masterplan within the environmental statement  (Application Document TR010035/APP/6.19).  (3) The landscaping scheme prepared under sub-paragraph (1) must include details of—  (4) All landscaping works must be carried out to a reasonable standard in accordance with the  relevant recommendations of appropriate British Standards or other recognised codes of good  practice.  (5) Any tree or shrub planted as part of the landscaping scheme that, within a period of 5 years  after planting, is removed, dies or becomes in the opinion of the relevant planning authority,  seriously damaged or diseased, must be replaced in the first available planting season with a  specimen of at least the same species and size as that originally planted, or where significant loss  occurs a size and species which accords with the provisions for replacement planting identified in  the approved HEMP, unless the Secretary of State, following consultation with the relevant  planning authority on matters related to its function, gives consent to a variation.  6. —(1) In the event that contaminated land, including groundwater, is found at any time when  carrying out the authorised development which was not previously identified in the environmental  statement, it must be reported as soon as reasonably practicable to the Secretary of State, the  relevant planning authority and the Environment Agency, and the undertaker must complete a risk  assessment of the contamination in consultation with the relevant planning authority and the  Environment Agency.  (2) Where the undertaker determines that remediation of the contaminated land is necessary, a  written scheme and programme for the remedial measures to be taken to render the land fit for its  intended purpose must be submitted to and approved in writing by the Secretary of State,  44 (a) the environmental information needed for the future maintenance and operation of the  authorised development;  (b) the long-term commitments to aftercare, monitoring and maintenance activities relating to  the environmental features and mitigation measures that will be required to ensure the  continued long-term effectiveness of the environmental mitigation measures and the  prevention of unexpected environmental impacts during the operation of the authorised  development; and  (c) a record of the consents, commitments and permissions resulting from liaison with  statutory bodies.  (a) location, number, species mix, size and planting density of any proposed planting;  (b) cultivation, importing of materials and other operations to ensure plant establishment;  (c) existing trees to be retained, with measures for their protection during the construction  period;  (d) proposed finished ground levels; and  (e) implementation timetables for all landscaping works.  Contaminated land and groundwater  Landscaping 