IiEMA models are typically based only on the extent of development at the time the <br />modeling was conducted and do not take into account the ultimate buildout of the <br />drainage area. This poses risks to other properties in or adjacent to floodplains and can <br />change the hydrograph of the river. <br />Policies <br />G.13 Improve surface and groundwater quality and quantity in the metropolitan area by <br />developing regulations or instituting programs for stormwater to: <br />a. Increase public awareness of techniques and practices private individuals can <br />employ to help correct water quality and quantity problems; <br />b. Improve management of industrial and commercial operations to reduce negative <br />water quality and quantity impacts; <br />G. Regulate site planning for new development and construction to better manage <br />pre- and post-construction storm runoff, including erosion, velocity, pollutant <br />loading, and drainage; <br />d. Increase storage and retention and natural filtration of storm runoff to lower and <br />delay peak storm flows and to settle out pollutants prior to discharge into <br />regulated waterways; <br />e. Require on-site controls and development standards, as practical, to reduce off- <br />site impacts from stormwater runoff, <br />f. Use natural and simple mechanical treatment systems to provide treatment for <br />potentially contaminated runoff waters; <br />g. Reduce street-related water quality and quantity problems; <br />h. Regulate use and require containment and/or pretreatment of toxic substances; <br />i. Include containment measures in site review standards to minimize the effects of <br />chemical and petroleum spills; and <br />Consider impacts to ground water quality in the design and location of dry wells. <br />G.14 Implement changes to stormwater facilities and management practices to reduce the <br />presence of pollutants regulated under the Clean Water Act and to address the <br />requirements of the ESA. <br />G.15 Consider wellhead protection areas and surface water supplies when planning stormwater <br />facilities. <br />Laurel Ridge Record (Z 15-5) I11-0-8 Page 234 <br />