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r KLEANFELDER Bright People.Right Solutiom Environmental Impacts Project Effects on Drainage, Surface Hydrology and Water Quality The proposed project involves expansion of an existing recycling facility, including construction of a 33,400 square foot building and additional paving of the site. Sufficient drainage capacity does exist within this system to serve the proposed improvements, as rdiscussed in Section 16, Utilities and Service Systems. Single-stream recyclable material processing and storage would occur in a roofed building, which would prevent contact of the materials with rain water. Materials such as scrap metal, wood waste, and cardboard that are processed and stored outside have historically shown only a small amount of runoff water. In addition, project site drainage will be altered by site grading procedures and directed into a clarifier prior to discharge into the City's storm drainage system (see Section 16, Utilities and Service Systems). Therefore, potential contamination of runoff by recyclable materials would be low. The proposed project would involve no other direct or indirect effects on surface water quantity. Construction of the proposed project would involve ground disturbance, with an associated potential for erosion, discharge of sediment, and the discharge of other construction-related pollutants from the site in storm water runoff. Other construction- related pollutants may include elevated pH from runoff contact with soils stabilizers, cement, petroleum hydrocarbons and toxic materials. The project would not involve a direct storm water discharge to surface waters; storm water discharges from the site would be directed to the City storm drain system, which drains to surface waters in the project vicinity. Proposed improvements to and use of the existing project site would result in the generation of a minor increase of urban runoff from additional impervious surfaces, resulting in contributions of urban runoff pollutants to the City's storm drainage system. These pollutants may include sediments, heavy metals, petroleum hydrocarbons, microbial pathogens, pesticides, materials toxic to aquatic life, and nutrients that may contribute to depressed dissolved oxygen levels. As with construction runoff, post- construction urban runoff would be discharged to the City storm drain system, and not directly to surface waters in the project vicinity. rThe State Water Resources Control Board (SWRCB) has the responsibility under the federal Clean Water Act and the National Pollutant Discharge Elimination System (NPDES) program for the control of storm water quality. The state has adopted general permits for construction activity that would apply to the project. Additional storm water regulation is established in the NPDES area-wide municipal separate storm sewer system (MS4) permit system administered by the SWRCB, which requires affected jurisdictions, including the City of Stockton, to adopt and implement a Storm Water Management Program (SWMP). r 121339/ST011 R226 3-38 October 14, 2011 Copyright 2011 Kleinfelder t