Ord 2011-021 - Laserfiche WebLink

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r.a .-.. CHESTNUT STREET LOFTS —. a� WATER QUALITY AND EROSION CONTROL PLAN FEBRUARY 2011 r�,a 0 w INTRODUCTION. This report has been prepared as a supplemental document in support of a zoning change application for the proposed Chestnut Street Lofts Project and will address water quality, detention, outlet control, and temporary erosion control facilities and techniques to be used for this proposed development. In addition, this report will address Low Impact Design (LID) and landscaping features that may be used to effect and complement the water quality control features. At the time of this zoning submittal the site plan featured therein is considered conceptual. Thus, the water quality, detention, outlet control, and erosion control features proposed in the following sections of this report should be considered preliminary. These features will be refined and adjusted in response to City review comments and suggestions and as a result of more detailed engineering design associated with the development of construction plans for a future submission of a Site Preparation Permit. Tables and figures referenced in this report appear behind the third page of this section of the report. PROJECT DESCRIPTION. Chestnut Street Lofts is a proposed multi -story student housing/retail /restaurant development on 1.9 acres located south of Chestnut Street at the intersection of Live Oak Street. This 1.9 acre tract formerly contained two small buildings which have been removed leaving the tract currently undeveloped. The topography of the tract drops approximately sixty feet from the northwest comer to the southeast corner. In addition there is a 12% drop along Chestnut Street from west to east. Topographic slopes on the north half of the tract are generally 15% or less; slopes on the south half are generally 15% and greater. A drainageway connecting to the San Marcos River to the east is located within the right -of -way (r.o.w.) of Sessom Drive along the south boundary of the Project site. More detailed information describing the proposed Project is contained in the other documents submitted with the zoning change request. WATER QUALITY. Consideration and selection of facilities for permanent water quality control were based on the following criteria: • Removal of at least 85% TSS • Minimize impact to the area of the tract south of the proposed building/parking improvements adjacent to the Sessom Street r.o.w. • Incorporate LID type features wherg feasible • Provide for non - erosive release of captured water quality and detention volumes and permanent by -pass storm -water flows • Integrate native landscaping