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Page 7 of 11 The proposed wall is designed with treated wood and concrete panels. City code requires fences to be made of chain-link, aluminum, wood, vinyl, composite or other materials approved by the Zoning Administrator. Alternate fencing materials may be allowed in business and industrial zoning districts subject to conformance with the design standards. The concrete panels are considered alternate materials. The Applicant states both wood and concrete are needed to achieve a functional noise barrier with a natural look. The application describes the materials as durable and intended to blend in with the natural landscape surrounding the proposed work area. The proposed wall height ranges from eight (8) feet to 21 feet as existing grade changes but would appear relatively even at elevation on the north leg with a gradual downward slope on the southwest leg. In Industrial Districts, walls and fences may be up to eight (8) feet in height in the side and rear yards up to the front building line of the principal structure. The proposed wall is in the rear yard of Building 14 and would exceed 8 feet in height. The north leg of the wall has a maximum height of 15 as measured from grade and the southwest leg of the wall has a maximum height of 21 feet. Images showing the height of the wall relative to Building 14 as viewed from different elevations are included on Sheet L402 in Attachment E. The Applicant states the design is intended to provide screening to mitigate noise from Building 14. The height of the wall, along with the 576-foot length, are designed to achieve the highest degree of sound management relative to the environment of the work area and adjacent residential properties. 2. Section 1325.055 – General Regulations, Tree and Landscaping Preservation The Applicant’s request requires the removal of existing landscaping adjacent to the proposed barrier wall. The submitted landscaping plan states that there is a total of 439 caliper inches of significant trees within the project area, and that 332 caliper inches need to be removed. Section 1325.055 Subd. 5 requires tree replacement if more than 10 percent of the caliper inches of significant trees on the property will be removed, which accounts for 43.9 caliper inches. The Applicant is required to plant 144 caliper inches. The landscaping plans show 127.5 caliper inches will be replaced within the project area, and that an additional 38.5 caliper inches will be planted at another location on the Boston Scientific Campus for a total of 166 caliper inches replaced by the applicant. The proposed mitigation plan exceeds the caliper inches required for replanting. To accommodate the required 166 caliper inches, the Applicant states that 51 new trees will be planted. Twenty-nine (29) are to be planted on the trail side of the barrier wall, with 22 planted on the campus side of the wall. The Applicant states the trees are intentionally located a sufficient distance from the wall to ensure viability and keep the planting activities inside the property lines. The application materials identify that the additional plantings will include 15 8-foot-tall white pines which will be planted near the Central Plant. As part of the tree preservation plan, the Applicant shall provide a performance guarantee in the amount of 125% of the cost of materials and installation, to be held for two growing seasons, upon which time the applicant shall satisfy the required replanting. The guarantee shall include the costs for planting within the project area and those planned near the Central Plant. A condition of approval is drafted to reflect this requirement.