(1)  For the purposes of section 152(2) of the Act, a person may only –

(a) excavate, or deposit, material in a landslip area if the excavation or deposition is carried out in such a manner as to allow rainwater or seepage to drain from the site; or

(b) permanently excavate or deposit any material for, or in connection with, building work in a landslip area if –

(i) the excavation is not more than 600 millimetres in depth; and

(ii) the material, when deposited, is not more than one metre in height above ground level and is compacted and graded so as not to aggravate existing landslip conditions; or

(c) backfill a trench or hole in a landslip area if the trench or hole is backfilled with well compacted material which was previously removed from the trench or hole; or

(d) fell or remove trees or other vegetation for, or in connection with, building work on land in a landslip area if the person has obtained the written agreement of a permit authority; or

(e) use any earth-moving or vibrating compaction equipment for, or in connection with, building work on land in a landslip area if the person has obtained the written agreement of a permit authority.

(2)  The building surveyor may grant a certificate of likely compliance for a permanent excavation of any vertical depth, or a deposit of filling of any height, in a landslip area if satisfied on the basis of a certificate given by a practising professional engineering geologist, or a practising professional engineer who has expertise in landslip areas, that the excavation or filling will not affect the stability of the land.