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<br />I <br /> <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />'- <br />.i <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />I <br /> <br />Parking lot <br /> <br />- <br /> <br />Stonn <br />sewer <br /> <br /> <br /> <br /> <br />1 Infiltration trench with surface Inlet I <br /> <br />Rner strip <br /> <br />Rner fabric <br />lines trench <br /> <br /> <br />Underground trench with olVgrft separator <br /> <br />. <br /> <br />Washed stone <br />or gravel <br /> <br />6"-12" sand filler <br /> <br />6"-12" sand filter <br /> <br />Observatio <br />port <br /> <br />10/89 4.4- 3 <br /> <br /> <br />3-chamber oiV <br />grit separator <br /> <br />~ Screen to keep <br />leaves out <br /> <br />Downspout <br />Overflow outlet <br /> <br />10' minimum <br /> <br />Paved surface <br /> <br />Overflow to stonn sewer <br /> <br />Washed stone <br />or gravel <br /> <br />Cistern type design <br /> <br />Washed stone <br />or gravel <br /> <br />'.' 'r', <br /> <br />6"-12" sand filter <br /> <br />Figure 4.4-1: TyplcallnflltratJon trench use <br /> <br />Obse rvatlon port <br />