801 E CASINO RD 2019-02-01 - Laserfiche WebLink

1.0 PROJECT OVERVIEW This Technical Information Report(TIR)provides the engineering data, analysis, and supporting calculations to develop the storm design for Cascade High School's new synthetic field improvements. This project is subject to the City of Everett's Everett Municipal Code (EMC) Chapter 14.28—Ordinance 2196-97 and the 2010 Stormwater Management Manual. 1.1 General Project Description The 37.3-acre site, owned by Everett Public Schools, is located at 801 East Casino Road in Everett, Washington. The school campus is bounded by East Casino Road to the east, State Route 526 to the south, commercial properties to the west, and Bruin Boulevard to the north. Originally built in 1961, the school and its associated improvements have gone through several modernizations and renovations to date. Existing driveways along the east side of the property provides access into the site from East Casino Road. The athletic fields and open grassy areas are located on the north half of the subject property. This area will be the primary focus of the campus improvements. The remaining south half of the site consists of the existing buildings and parking lots and is not a part of this project. The proposed improvements primarily consist of re-surfacing the existing natural turf football field with synthetic turf The project scope also includes an asphalt pedestrian path to link Bruin Avenue to the campus and a small set of bleachers. The existing drainage system will, for the most part, remain in place. A recent TV inspection of the system showed it to be in good condition. 2.0 SITE ASSESSMENT 2.1 Topography In the area of the track and field, the general topography slopes down in elevation from west to east. The total topographic relief in this area is approximately 10 feet. An existing mounded slope and bench is located along the western perimeter of the site, which includes an existing gravel access road and the shot-put area. The track and field is generally flat. The athletic fields and parking lots east of the project site slopes gently down, at 1-3 percent,to East Casino Road. 2.2 Drainage The existing drainage system, which will remain in place, consists of a series of pipes and catch basins conveying flows east to an 18" diameter storm system adjacent to the existing tennis courts. From here, the piped system directs runoff north to a 27" storm drain in Bruin Boulevard (See Appendix B - Existing Drainage Map). The football field has perforated underdrains. A recent TV inspection of the drainage system showed it to be in good condition. Upon completion of all construction activities, the existing drainage system will be cleaned as necessary. 2.3 Soils Based on the Natural Resources Conservation Service - Soil Survey of Snohomish County, the onsite soils consist of Alderwood Urban Land Complex, which is classified as a "C" hydrologic soil type. A copy of the soil survey and a detailed description is provided in Appendix B. Technical Information Report Synthetic Turf Field Project 1 Integrityworks Consulting Engineers,LLC Project No.212107