3620 BROADWAY VERIZON 2019-01-11

Existing Impervious Ex. Building = 1,285 sf(prior to demolition) Ex. Pavement =4,819 sf Total = 6,104 sf Proposed Impervious Proposed Building = 3,800 sf Proposed Parking/DW = 3,058 sf Proposed Sidewalk = 490 sf Total = 7,348 sf Note: New Impervious Surface=7,348 sf—6,104 sf= 1,244 sf MR2 SWPPP NARRATIVE I. Elements A Construction Stormwater Pollution Prevention Plan(SWPPP) needs to have construction plans and drainage report as part of the full or targeted drainage plan. The drainage report will have a section that discusses the 12 elements as they apply to the project. The 12 elements that are part of a construction SWPPP are as follows: 1. Mark Clearing Limits: The clearing limits will be marked with silt fences near the limits of work. 2. Establish Construction Access: Construction entrance will utilize the existing driveway accesses. 3. Control Flow Rates: The site is quite permeable. The work will take less than four months and then replanted with grass/hydroseeded. No flows are anticipated to be detained other than the silt fences and that is a filtering process. 4. Install Sediment Controls: Prior to construction, erosion control measures are required to be installed. These will include straw bale barriers, silt fence and limited sediment traps. 5. Stabilize Soils: The soils are Alderwood-Urban land complex that is suitable for temporary dispersal of runoff on-site. From October 1 through April 30, no soils shall remain exposed and unworked for more than 2 days. Hydroseeding or hand-sowing after construction will be conducted and mulching with straw on the disturbed areas.