• <br /> (2). Existing trees to be retained on private property shal not have <br /> construction occur within the drip line, unless a andscape <br /> architect certifies that affected trees will have at 1 st a 90 <br /> percent chance of survival over a 5 year period. .Tre s to be . <br /> saved shall be kept free from trunk abrasion. <br /> (3) The Planting Plan may be required to include specificat ons for <br /> topsoil, including depth and organic matter requirem nts, to <br /> ensure the health and vitality of required plantin . Where <br /> planting areas have been excavated, the Planting P an shall <br /> provide for the replacement of topsoil. All waste material shall <br /> be removed from required planting areas prior to the ap <br /> of topsoil. <br /> (a) Inspection may be made by the Director prior to p1_nting to <br /> verify proper rough grade and installation of i rigation <br /> systems. <br /> (b) Plant materials and soil preparation may be inspec'ed prior <br /> to or in conjunction with the occupancy inspection :o ensure <br /> that placement, quantity, size and variety confor to the <br /> approved Planting Plan and the requirements of this Article. <br /> Nursery tags identifying variety and species shall remain on <br /> plant specimens until the Final Building Inspectio by the <br /> Building Official or the issuance of a Certif sate of <br /> Occupancy. <br /> 31.160 SITE PLAN REVIEW - SCREENING AND LIGHTING STANDARDS <br /> (1) Unless otherwise specified in this Code, screening - hall be <br /> required: <br /> (a) Where commercial and industrial districts abut re- .dential <br /> districts and no approved screening exists. <br /> (b) For outdoor mechanical devices and minor and maj. public <br /> facilities. <br /> (c) For outdoor storage yards and areas. <br /> (d) For trash receptacles. <br /> (2) Screening shall be vegetative, earthern and /or structu al and <br /> shall be designed to minimize visual and audible incompati,le uses <br /> from adjacent properties. Except as specified in Subsecti (2) <br /> (d)1. of this Section, screening shall be continuous to at least 6 <br /> feet above ground level. The following standards shall app y: <br /> 31 -12 <br />