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Table 1: PGL Site Drainage Areas and Runoff Components <br />Existing <br />Existing <br />Proposed <br />Proposed <br />TDA <br />Basin <br />Pervious <br />Impervious <br />Pervious <br />Impervious <br />(Acre) <br />(Acre) <br />(Acre) <br />(Acre) <br />1 <br />Al <br />- <br />- <br />0.075 <br />0.084 <br />1 <br />A2 <br />- <br />- <br />0.169 <br />0.025 <br />1 <br />A3 <br />- <br />- <br />0.127 <br />0.005 <br />1 <br />A4 <br />- <br />- <br />0.044 <br />0.029 <br />1 <br />AS <br />- <br />- <br />0.054 <br />0.061 <br />1 <br />A6 <br />- <br />- <br />0.030 <br />0.007 <br />1 <br />A7 <br />- <br />- <br />0.114 <br />0.039 <br />1 <br />R1 <br />- <br />- <br />0.050 <br />- <br />1 <br />R2 <br />- <br />- <br />0.068 <br />- <br />1 <br />BO <br />- <br />- <br />0.092 <br />0.011 <br />1 <br />TOTAL <br />0.15 <br />0.93 <br />0.250 <br />0.833 <br />Table 2: Existing Off -Site Basins for Analysis <br />Existing <br />Existing <br />TDA Basin Description <br />Pervious <br />Impervious <br />(Acre) <br />(Acre) <br />South Marina Parking <br />1 SMP <br />0.719 <br />7.231 <br />(Upstream) <br />Lombardi's parking <br />1 LPL <br />(Downstream) <br />0.172 <br />1.375 <br />1 ALL TOTAL <br />0.891 <br />8.606 <br />In accordance with section 4-3 of the City of Everett design standards, peak runoff rates for conveyance <br />sizing and backwater analyses were calculated using the rational method, these calculations are included in <br />Appendix E. Per section 4-3.1(2) of the City of Everett design standards, a continuous simulation model, <br />MGS Flood, was used to size the proposed stormwater treatment facility. A summary of the design flow rates <br />is shown below in Table 3 and a readout of the MGS Flood analysis is included in Appendix F. <br />7P WN7 N 7-) <br />