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Seattle,Washington <br /> T 06522 9510 m <br /> PA LAND <br /> TURNING VISIONS INTO RFAI_.ITY <br /> The site is constrained by the existing developed stormwater system of catch basins and <br /> underground detention pipes. Additionally there is limited area to propose aboveground <br /> treatment facilities. Therefore, the Department of Ecology (DOE) General Use Level <br /> Designation (GU LD) Stormfi IterTM system has been selected to provide Basic Treatment. <br /> A summary of the stormwater treatment facility is provided in the table below. <br /> Table 7 — Stormwater Treatment Facility Information <br /> Treatment Location Cover Type Area Water Quality 15-min Number of Cartridges <br /> (AC) Flow Rate(cfs) (18") <br /> East Parking (POC Pavement/ 1.55 0.2079 14 <br /> #1) Landscape <br /> West Parking (POC Pavement/ 1.37 0.1991 12 <br /> #2) Landscape <br /> Per discussions with the City of Everett, an equivalent catchment area can be used to <br /> provide treatment for the new pollution generating impervious surfaces. The table below <br /> provides a breakdown of these areas. <br /> Table 8 — Equivalent Treatment Areas <br /> Equivalent Area Area <br /> Treatment Areas <br /> Area to Treat (AC) (AC) <br /> East Parking(POC#1) 1.48 <br /> - Pavement Area Only <br /> New PGIS 0.77 West Parking (POC <br /> #2) - Pavement Area 1.26 <br /> Only <br /> Total 0.77 Total 2.74 <br /> For additional information including basin maps, details and WWHM results of the <br /> proposed treatment facility, see Appendix D — Treatment— Supplemental Information. <br /> Everett Mall Plaza Parcel Ill Retail Expansion Stormwater Site Plan Page 23 <br /> '� I '3 / r3 <br />