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The Existing and Forecast Year 2011 noise estimates assumed a vehicle mix of 97,8 percent automobiles, 1.4 percent medium trucks and 0.8 percent heavy trucks. The percentage of vehicles was based on the Noise Impact Assessment Report which was included as part of the 1997 Centre Pointe Business Park EA W, The results of the 1997 noise modeling analysis indicated that the noise levels for the Forecast Year 2011 modeled conditions with and without the project traffic are predicted not to exceed the state daytime residential standard of 65 dBA. Project generated traffic was forecast to add 1 dBA or less to noise levels in the Twin Lakes Development. A change in traffic noise levels ofless than 3 dBA is generally considered to be imperceptible. Therefore, the forecast change in noise associated with project generated traffic was not considered to be a significant impact. XIX. Soils, Erosion and Sedimentation The native soils in the project area are moderately to well drained loams, sandy loams and sand/gravel. Native soils are apparent only in small isolated pockets within the project area. The majority of the project area is classified as Urban Land which includes 90% coverage by buildings and pavement. Native soils under the Urban Land have been greatly altered through excavation and filling accomplished during the original development of the area. Soil borings will be conducted prior to the design of buildings, roadway, utility and other site improvements in order to more accurately classify the existing conditions. The Twin Lakes project area includes generally flat to mildly sloped developed sites. It is anticipated that grading required to redevelop the area will be minor and minimal changes to existing surface slopes will occur. Sedimentation is a concern that is related primarily to the construction process. The use of appropriate erosion control and turf establishment practices (Best Management Practices) can greatly reduce the amount of construction-related sedimentation into the receiving waters. These measures will be specified in the contract documents and on the design plans, as required. Best Management Practices typically consist of silt fences, hay bales, wood fibre blankets, riprap, sodding, seeding and mulching. Ungrouted riprap with filter blankets will be placed at storm sewer outlets. All disturbed areas will also be seeded with native vegetation or sodded. Based on City standard site grading requirements, the maximum finished slope ratio on the project is proposed to be 3 (horizontal): 1 (vertical). Erosion and sedimentation control measures will be implemented prior to grading and maintained in a functional condition during construction. The control measures will remain in place until the project area has been resurfaced and revegetated. Installing and maintaining temporary erosion protection and sedimentation control will be the responsibility of contractors working in the project area in strict conformance with approved erosion control plans. 18