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<br /> <br />PRINCIPLE No. 10 <br /> <br />Wherever possible, provide stormwater treatment for <br />parking lot runoff using bioretention areas, filter strips, <br />and/or other practices that can be integrated into required <br />landscaping areas and traffic islands. <br /> <br />CURRENT PRACTICE <br /> <br />Parking Lots are a significant source of stormwater pollutants in the suburban landscape, particuLarly Lots <br />in commerciaL areas. These Large impervious areas also generate a significant volume of runoff. Vehicle <br />wear and tear, emissions and leakage, and atmospheric deposition are the key pollutant sources. Parking <br />lots are almost completely impervious, so much of the pollutants deposited on the Lot surface will be <br />washed off by stormwater runoff. <br /> <br />Figure 10.1: Percent of Stormwater Pollutant load and Stormwater Runoff Volume Attributable to Parking <br /> lots by land Use for Various Stormwater Pollutants (Based on Bannerman et aL 1992) <br /> 70% <br /> 61.2 61.6 <br /> 60"1. [J Commercial <br />Q) <br />'" <br />::;) II Industrial <br />""'C <br />c <br />c 50"1. <br />....J <br />'- <br />0 <br />- <br />"'U <br />C <br />0 40% <br />....J <br />-a <br />"0 <br />..... <br />- <br />0 30"1. <br />*' <br />c <br />'" <br />C <br />"'U :0% <br />c <br />0 <br />....J <br />- <br />0 <br />-I <br />C) 10% <br />c <br />~ <br />'- <br />0 <br />a- <br /> 0% <br /> Suspended Sollde Total PIIoephorus Total Copper Total ZInc Runoff Volume <br /> <br /> <br />- 83 - <br />