(1) Intent. The L1 standard is a landscape treatment for open areas. It is intended to be applied in situations where distance is used as the principal means of separating uses or development, and landscaping is required to enhance the area in-between. While primarily consisting of ground cover plants, it also includes a mixture of trees, high shrubs, and low shrubs.

(2) Required Materials. The L1 standard requires one tree per 800 square feet and either two high shrubs or three low shrubs per 400 square feet of landscaped area. The shrubs and trees may be grouped. A combination of ground cover plants, grass, barkdust, decorative rock or like materials as approved by the Design Review Board, must fully cover the remainder of the landscaped area. See Figure 330-1.

(1) Intent. The L2 standard is a landscape treatment which uses a combination of distance and low level screening to separate uses or development. The standard is applied where a low level of screening is adequate to soften the impact of the use or development, or where visibility between areas is more important than a total visual screen. It is usually applied along street lot lines.

(2) Required Materials. The L2 standard requires enough low shrubs to form a continuous screen 3 feet high and 95 percent opaque year around. In addition, one tree is required per 30 linear feet of landscaped area or the equivalent. A combination of ground cover plants, grass, barkdust, decorative rock or like materials as approved by the Design Review Board, must fully cover the remainder of the landscaped area. A 3 foot high masonry wall or a berm may be substituted for the shrubs, but the trees and ground cover are still required. When applied along street lot lines, the screen or wall is to be placed along the interior side of the landscaped area. See Figure 330-2.

(1) Intent. The L3 standard is a landscape treatment which uses screening to provide the physical and visual separation between uses or development. It is used in those instances where visual separation is required.

(2) Required Materials. The L3 standard requires enough high shrubs to form a screen 6 feet high and 95 percent opaque year around. In addition, one tree is required per 30 linear feet of landscaped area or the equivalent. A combination of ground cover plants, grass, barkdust, decorative rock or like materials as approved by the Design Review Board, must fully cover the remainder of the landscaped area. A 6 foot high masonry wall may be substituted for the shrubs, but the trees and ground cover are still required. When applied along street lot lines, the screen or wall is to be placed along the interior side of the landscaped area. See Figure 330-3.

(1) Intent. The L4 standard is intended to be used in special instances where extensive screening of both visual and noise impacts is needed to protect abutting sensitive uses in areas and where there is little space for separation.

(2) Required Materials. The L4 standard requires a 6 foot high masonry wall along the interior side of the landscaped area. One tree is required per 30 linear feet of wall or the equivalent. In addition, four high shrubs are required per 30 linear feet of wall. A combination of ground cover plants, grass, barkdust, decorative rock or like materials as approved by the Design Review Board, must fully cover the remainder of the landscaped area. See Figure 330-4.

(1) Intent. The L5 standard is intended to be used in special instances where extensive screening of both visual and noise impacts is needed to protect abutting sensitive uses, and where it is desirable and practical to separate a use by distance as well as sight-obscuring materials.

(2) Required Materials. The L5 standard requires a berm between 4 and 6 feet high. If the berm is less than 6 feet high, low shrubs that meet the L2 standard must be planted on top of the berm to assure that the overall screen height is 6 feet. In addition, one tree is required per 30 linear feet of berm or the equivalent. A combination of ground cover plants, grass, barkdust, decorative rock or like materials as approved by the Design Review Board, must fully cover the remainder of the landscaped area. See Figure 330-5.

(1) Intent. The F1 fence standard provides a tall, but not totally blocked visual separation. The standard is applied where a low level of screening is adequate to soften the impact of the use or development, or where visibility between areas is more important than a total visual screen. It is applied in instances where landscaping is not necessary and where nonresidential uses are involved.

(2) Required Materials. Fences must be 6 feet high and at least 50 percent sight-obscuring. Fences may be made of wood, metal, bricks, masonry or other permanent materials. See Figure 330-6.

(1) Intent. The F2 fence standard provides a tall and complete visual separation, and is intended to be used in special instances where complete screening is needed to protect abutting uses, and landscaping is not practical. It is usually applied in nonresidential situations.

(2) Required Materials. Fences must be 6 feet high and 100 percent sight-obscuring. Fences may be made of wood, metal, bricks, masonry or other permanent materials. See Figure 330-7.