9212 HOLLY DR 2018-01-02 MF Import

1 Page 7 of 29 ' 11. Off -Site Analysis ' The existing topography of the site directs flow from the subject property into the North Creek sub basin of the Lake Washington Watershed. The downstream analysis for the ' property is based on field reconnaissance and on available record information. ' Date of Field Inspection: Friday, March 16, 2007 Weather Conditions: Overcast, mid - 500 F Water flows through 12" concrete pipe along the 375 feet of property fronting Holly Drive. See Figure 4 — Natural Drainage Pattern. At the northeast/southeast property comer flow continues through 70 ft of 18" concrete pipe. Flow exits the pipe into 25 ft of ' open channel. Water exits the open channel into 60 ft of 18" concrete pipe that flows into a catch basin on the south east corner of Corbin and Holly Drive. From the catch basin, ' water flows north along Holly drive. The catch basin on the northeast corner of Corbin and Holly Drive could not be located. There was a large amount of dirt and gravel covering the area. Drainage could be located again 220 fl north of Corbin drive at a catch basin in the Fluke Corporation parking lot. Flow entered and exited the catch basin ' through 18" piping. From the parking lot, flow continues north and mergers with the storm drainage system along Evergreen Way. The field investigation was completed at eEvergreen Way. Storm Drainage records continue drainage flow down Evergreen Way to the completion of the '/a mile downstream analysis. See Figure 5 — City of Everett ' Drainage Record. Based on field observations, there were signs of flooding and insufficient drainage along the NE boundary of the property. Offsite drainage was adequate, but requiring maintenance. 1 1 1 1