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15. Water Surface Use Will the project change the number or type of watercraft on any water body? _Yes --X.. No Response: No recreational surface waters are present on the site. 16. Soils Approximate depth in feet to: Groundwater: Bedrock: minimum i... minimum 50 average 1.Q. average ~ Describe the soils on the site, giving SCS classifications, ifknown (SCS interpretations and soil boring logs need not be attached). Response: 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 roadway, utility and other site improvements in order to more accurately classify the existing conditions. A soil map ofthe area is presented in Figure 5. 17. Erosion and Sedimentation. Give the acreage to be graded or excavated and the cubic yards of soil to be moved: acres: aporoximately 126: cubic yards: Assumin~ a tvoical cut or fill of approximate Iv 2 feet. it is estimated that aooroximatelv 410.000 cubic vards of material will be excavated or used in embankments for roadway construction and site develooment. Actual volume of soil to be moved will be determined as a part of the final design for each se~ent of the develooment area. Describe any steep slopes or highly erodible soils and identify them on the site map. Describe the erosion and sedimentation measures to be used during and after construction of the project. Response: 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). #24397 11