Ord 2013-003/PDD for Capes Camp and Thompson's Island

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a basin is designed as approved by the Engineering Director in accordance with the Contaminant Removal Guidelines of the City of San Marcos. These basins shall be maintained at all times so that efficient removal of the contaminants is continuous. Disposal of removed or filtered contaminants shall be as approved by the Engineering Director in accordance with the Contaminant Removal Guidelines of the City of San Marcos. Input to and release from water quality basins shall utilize grass -lined swales and /or overland flow dispersion measures. Natural drainage patterns shall be preserved whenever possible, and the loss of the previous character of the soil should be limited in order to prevent erosion and attenuate the impact of contaminants collected and transported by stormwater. Open surface drainage through grass -lined swales is preferred. Drainage objectives can best be accomplished by leaving portions of a subdivision in an underdeveloped and natural state and located to receive runoff from the developed areas for purposes of unchannelized, overland flow. The use of streets as the central drainage network is prohibited. Construction of enclosed storm sewers and impervious channel linings are permitted only when the Engineering Director, on the basis of competent engineering evidence, concludes that the storm sewers or impervious linings are the only justifiable option available. If stormwater drainage systems and /or culverts are necessary, these systems shall be designed to mitigate their impact on water quality through the use of approved control strategies to control sediment, neutralize contaminants and dissipate energy by the use of multiple smaller outlets, whenever practical, by locating discharges to maximize overland flow and by any other strategies that will accomplish the objectives defined and discussed in the LDC. Impervious cover on land within the San Marcos River Corridor outside a water quality zone shall be limited by the gradient of the land to be developed, as follows: 1. 30 percent on areas having a slope with a gradient of less than 15 percent; or 2. 20 percent on areas having a slope with a gradient of between 15 and 25 percent; or 3. Ten percent on areas having a slope with a gradient greater than 25 percent. 4. Credit shall be given for the use of pervious surfaces and materials in direct proportion to the pervious character of the material. 6.06 Project Layout and Streetscape The project layout shall designed to provide for buildings fronting on and addressing River Road and Cape Road, a street landscape buffer with street trees and building wrapped parking located on the interior of the Project Site in accordance with the Detailed Illustrative Conceptual Plan. A street landscape buffer shall be provided along River Road which includes a minimum six foot (6') sidewalk, street trees at a spacing of one (1) tree for every 30 linear feet, and pedestrian scale lighting. Street trees may be clustered together or distributed evenly along the street frontage so as to create an attractive and functional streetscape. Street 11