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r <br /> � 2.1.3 Soils <br /> I Sitc: specific geotechnical investigation and analysis has been pertortned by <br /> GeoEngineers and is included in Section 7.0. In general, soils onsite are composed of <br /> glacia!till underlain by advance outwash deposits. <br /> I3.0 OFFSITE ANALYSIS <br /> ' 3.1 Downstream Analysis <br /> Site discharge wili enter the existing 18-inch storm system in Tower Street. Flow eventually <br /> enters a sanitary sewer treatment plant. No adverse impact to the downstream system is <br /> f anticipated because proposed stormwa[er runoff will enter a closed combined storm and saniWry <br /> system, and the discharge poinks and peak Flows are approximately the same as in the pre- <br /> developed condition. <br /> f3.2 Upstream Analysis <br /> The storm systems within the developed adjacent properties preclude significant offsite <br /> � contributory runoff to the site. RunoH from the property to the noRh is contained within the <br /> stormwater mllection system in Tower Street. Runoff from the property [o the east is bordered <br /> by an existing building that provides its own stormwater wllection system. Runoff from the <br /> I property to the west is contained within the bus transit center and provides its own stormwater <br /> collection system. The only appreciable tributary runoff would be from the undeveloped property <br /> located southwest of the site, and the existing parking lot located southeast of the site. The <br /> � undeveloped property southwest of[he site is heavily vegetated with a fence that borders the <br /> site. Majority of the runoff within this undeveloped area will infiltrate onsite and be absorbed in <br /> the vegetation. Runoff from the existing parking lot southeast of the site will sheet Flow to the <br /> site and collect in the existing stormwater collection system located on the east portion of the <br /> ( site. Tributary runoff to the site is anticipated to be minimal. See Appendix A, Exhibit 4. <br /> 4.0 ANALYSIS AND DESIGN OF REQUIRED EROSION AND <br /> ISEDIMENT CONTROL BMPS <br /> All new development that inciudes land alteration activities of one acre or more requires specific <br /> I erosion and sediment control. It has been determined that there are no seasonal limitations for <br /> this projecl, as per the Seasonal Limitations Rating Checklist(see Appendix A, Exhibit 7). <br /> I4.1 System Description <br /> • Construction entrance will be provided to reduce the amount of sediment transported onto <br /> parcel roads by vehicles or equipment. <br /> � . Filter Fabric Fence will be provided along the downstream perimeter project clearing limits <br /> to capture sediments from impacting downstream properties or roadways. <br /> . Catch basin inlet protection will be placed on all offsite catch basin inlets affected by <br /> construction activities. After installation of onsite catch basins, inlet proteetion will be <br /> provided as work progresses. <br /> . Cover meas��s will be implemented, and seasonal special provisions shail be required. <br /> Slormwatcr Site Plan OQ � O <br /> Everett Community College <br /> Fitness Centcr 3 <br /> I 208221.10 <br /> � <br />