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'mu :Jinll tiIffl iriblinf i $ R eF •. <br /> , , . <br /> _ _ _ __ 4 _ . . <br /> y <br /> -1 . . 02,. , ,... <br /> .17, <br /> _i_ , /, e <br /> , 7/ <br /> / e <br /> / <br /> __ <br /> 4.4, <br /> d, AI <br /> ..,....... L St./ / <br /> Figure 4-2: In-Kind Sub-Basin Areas <br /> Full infiltration is proposed using the long-term infiltration rate of 0.15 inches per hour as determined by PIT <br /> testing completed by GeoEngineers on February 15th, 2022. See Appendix F for Geotechnical Report and <br /> follow up email detailing the results of the infiltration PIT tests. Tables 4-3 and 4-4 below detail the existing and <br /> proposed stormwater discharge rate based on the flow control performance standard above. <br /> Table 4-3: In-Kind Existing Versus Proposed Site Areas <br /> Existing Site Areas Proposed Site Areas <br /> (SF) (SF) <br /> Impervious Surface(Roof) 14,609 14,378 <br /> Impervious Surface(Pavement) 35,487 31,363 <br /> Pervious Surface 2,166 6,521 <br /> Table 4-4: In-Kind Existing Versus Proposed Peak Flows Rates <br /> Predevelopment Runoff Post-Development Runoff <br /> Tr (Years) Discharge Tr (Years) Discharge <br /> (cfs) (cfs) <br /> 2-Year 0.025 2-Year 0.000 <br /> 10-Year 0.052 10-Year 0.000 <br /> 25-Year 0.068 50-Year 0.000 <br /> 50-Year 0.075 100-Year 0.000 <br /> KPFF Consulting Engineers <br /> 8 <br />