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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES F. HYDROLOGY AND WATER QUALITY Basin Plan. All facility operators must prepare,retain on site, and implement a Storm Water Pollution Prevention Plan (SWPPP)to identify sources of pollution and to prescribe implementation of best management practices to reduce or prevent pollutants in industrial storm water discharges and authorized non-storm water discharges. Areas of industrial activity where surface runoff is to be controlled and treated include all storage areas and storage tanks, shipping and receiving areas, fueling areas, vehicle and equipment storage/maintenance areas, material handling and processing areas, waste treatment and disposal areas, dust or particulate generating areas,cleaning and rinsing areas, and all other areas of industrial activity that are potential pollutant sources (SWRCB, 1997). Any changes to the industrial site or activity require an update of the SWPPP and implementation of new control measures. The facility currently operates under an NPDES Industrial Stormwater Discharge General Permit (WDID 5B9S001642) with a Stormwater Pollution Prevention Plan approved by both the Regional Board and the San Joaquin County Public Health Services Department. Under the proposed project,the SWPPP will require updating to reflect changes to the industrial site. IMPACTS AND MITIGATION MEASURES ANALYSIS METHODOLOGY This section analyzes potential impacts by comparing current(2000)conditions with future conditions under the proposed project. SIGNIFICANCE CRITERIA A hydrologic or water quality Impact of the project would be considered significant If It met any of the following criteria, adapted from CEQA guidelines,Appendix G. ® Violate any water quality standards, waste discharge requirements,or otherwise substantially degrade water quality. • Substantially deplete groundwater supplies or interfere substantially with groundwater recharge. • Substantially alter the existing drainage pattern of the site or area, which would result in substantial erosion of siltation on- or off-site. • Substantially alter the existing drainage pattern of the site or area, which would result in flooding on-or off-site. • Create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff. • Place within a 100-year flood hazard area structures that would impede or redirect flood flows. Stockton Sravenger Transfer Station Expansion III.F.5 ESA/990190