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Water Quality Management Plan (WQMP) <br />Mainplace Mall Specific Plan <br />E <br />1.74 <br />1.47 <br />-15.5% <br />Subtotal C <br />through E <br />30.63 <br />31.21 <br />1.9% <br />Drainage <br />Area <br />Existing 2-Year Volume <br />(acre-feet) <br />Proposed 2-Year Volume <br />(acre-feet) <br />Percent Increase <br />C <br />1.54 <br />1.61 <br />4.5% <br />D <br />0.96 <br />0.75 <br />-21.9% <br />E <br />0.13 <br />0.13 <br />0% <br />Subtotal C <br />through E <br />2.63 <br />2.49 <br />-5.3% <br />Areas C, D, and E drain to Santiago Creek, which is susceptible to hydromodification. The 2- <br />year peak flow rate and volume increase from these areas is less than 5%. <br />IV.3.6 Regional/Sub-Regional LID BMPs <br />No regional or sub -regional LID BMPs are available or proposed. <br />IV.3.7 Treatment Control BMPs <br />Treatment control BMPs may be used as pre-treatment for certain LID BMPs, particularly <br />infiltration BMPs. The sizing of treatment control BMPs shall accommodate the treatment flow <br />rates outlined in Section IV.2 of this report. <br />IV.3.8 Non-structural Source Control BMPs <br />Fill out non-structural source control check box forms or provide a brief narrative explaining if non- <br />structural source controls were not used. <br />Non -Structural Source Control BMPs <br />Check One <br />If not applicable, state brief <br />reason <br />Identifier <br />Name <br />Included <br />Not <br />Applicable <br />Centennial Section IV <br />Conceptual Specific Plan WQMP Page 27 <br />