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Planned Development District Development Standards 2.4 The Preserve at Windemere Phase 1 Windemere, Phase 1, this PDD modifies the Code requirement to a minimum lot width of 125 feet. Were the same 74 proposed SF -R lots covering the same Phase 1 area to be developed under conventional code requirements for lot width; approximately 45,200 s.f. of additional impervious cover would be required in the form of roadway area square footage. The development of the Project Site shall conform to the dimensional and developmental standards of the Land Development Code with the following exception. Current Land Development Code Requireme nt PDD Code Modification Table 4.1.6.1: Minimum Lot Width for SF- Table 4.1.6.1: Minimum Lot Width for SF -R R Residential Districts: Residential Districts: 150 Feet 125 Feet Low - Impact Development: Low - Impact Development (LID) is an approach to land development utilizing various design techniques and practices to minimize stormwater impacts and preserve water quality. These goals are achieved through use of various stormwater runoff storage measures dispersed uniformly throughout a development and designed to mimic the predevelopment hydrology of the site. LID integrated management practices (IMPs) for the Preserve at Windemere, Phase 1 shall achieve 85% reduction in TSS for the developed condition. LID IMP's (exceeding code requirements) to be used include: • maximizing and increasing dis- connectivity of impervious areas; • open vegetated drainage swales as an alternative to conventional curb /gutter and drainage pipe systems; • increasing channel widths, reducing channel slopes; • preserving of natural vegetation; • bio- retention, in the form of rain gardens, to be constructed on each individual residential lot for retention /treatment of impervious areas associated with that individual residential lot. Individual lot rain gardens are to be designed by landscape professionals in accordance with City of San Marcos LID guidelines. Site specific information for the rain gardens shall be provided to city staff as part of the typical permitting process for individual residential lot development to preclude prohibitive design, review and processing costs. Rain Gardens shall be constructed when each individual home is built and shall be maintained by each homeowner; • rain garden /bio- retention facilities within cul -de -sac bulbs, or alternative narrower one -way "u" shaped street sections with bio- retention areas between drive lanes; • dispersed retention and detention storage in swales, channels, bio- 5 10/06/11