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KLE/NREL®ER Bright People.Right Solutions. The City of Stockton has adopted a SWMP, which is intended to minimize the potential storm water quality impacts of development, including both construction and post- construction activity. The Stockton SWMP consists of a variety of programs, including controls on illicit discharges, public education, controls on City operations, and water quality monitoring. Program elements most applicable to land development include construction storm water discharge requirements, industrial discharge requirements and the incorporation of post-construction Best Management Practices (BMPs) in new development. The requirements of the SWMP are enforced primarily through the City's Storm Water NPDES permit, issued by the Regional Water Quality Control Board (RWQCB), Central Valley Region. Requirements applicable to the project are restated as mitigation measures below. The principal Stockton SWMP control on construction and industrial storm water quality is the preparation and implementation of a Storm Water Pollution Prevention Plan (SWPPP), which is required for any industrial sites and development projects exceeding one acre in size; this is a requirement of the state general permit system and the City. The SWPPP identifies potential construction pollution sources, identifies needed BMPs, and specifies maintenance and monitoring activities needed to prevent exceedence of applicable water quality standards. Industrial requirements are related to prevention of potential water pollution derived from industrial processes, runoff from materials handling and storage areas, leaks and spills and soil erosion. Construction BMPs include provisions for erosion control, including limitations on disturbance and temporary soil stabilization through the use of mulch, seeding, soil stabilizers, and fiber rolls and blankets. BMPs may also include filtration devices, silt fences, straw bale ibarriers and sediment traps or basins. The SWPPP must be prepared prior to construction activities and must be available on the construction site. A Notice of Intent (NOI) describing the status of the project and SWPPP must be filed with the SWRCB, which then issues a Waste Discharger's Identification Number (WDID). The City requires that an Erosion Control Plan be incorporated into development plans. Post-construction elements of the SWMP are governed by City ordinances that require compliance with the City's adopted Storm Water Quality Control Criteria Plan (SWQCCP). The SWQCCP identifies a range of post-construction BMPs that must be incorporated into development plans. BMPs include provisions for water quality control tas well as volume reduction. Under new NPDES requirements applicable to the City, storm water discharge volumes associated with new development cannot exceed existing discharges. Volume control can be achieved through a combination of low- , impact development and specific volume control measures. The proposed project would be required to conform to the applicable requirements. Storm water from areas of new development must be treated using the BMPs specified in the SWQCCP. These BMPs, which provide water quality treatment and volume control for runoff from building, paving and other site development areas, include 121339/ST011 R226 3-39 October 14, 2011 Copyright 2011 Kleinfelder