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Administrative Draft Environmental Impact Report Gill Medical Center Project 4.12.5.3 Project Impacts and Mitigation Measures Impact 4.12-1: Construction of the Project could result in runoff that contains pollutants that would degrade water quality. Impact Determination: less than significant Threshold: Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality. Project construction would involve removing the existing vineyard and other related agricultural improvements on the site, along with grading and excavation. If uncontrolled, these ground disturbing activities would leave bare soil exposed, which could be mobilized during storm events and result in polluted runoff. However, since the area of disturbance would be greater than one acre, the Project would be required to comply with the Federal NPDES and Statewide National Pollutant Discharge Elimination System Storm Water Permit for General Construction Activity, as described in Sections 4.12.1 and 4.12.2, respectively. The applicant would be required to file a Notice of Intent to comply with the Statewide General Construction Activity NPDES permit with the State Water Resources Control Board and the RWQCB. A construction stormwater pollution prevention plan (C-SWPPP) would need to be prepared by a Qualified SWPPP Practitioner or Qualified SWPPP Developer (QSP/QSD).The C-SWPPP would identify appropriate BMPs to prevent pollutants, including sediment, from entering stormwater and leaving the site during construction activities.The C-SWPPP would also include monitoring and reporting requirements to verify that water quality is not degraded. Due to the requirements to comply with the federal and state NPDES and stormwater programs as part of the Project, this would be a less than significant impact. Mitigation Measures None required. Impact 4.12-2: Discharge of wastewater from the medical facilities could degrade surface water and/or groundwater quality and violate the Basin Plan. Impact Determination: less than significant with mitigation incorporated Thresholds: Violate any water quality standards or waste discharge requirements or otherwise substantially degrade water quality; and Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan. As described in Section 4.21 (Utilities and Service Systems), below, because the Project site is located outside the City of Stockton wastewater service area, it is not eligible for City sanitary sewer service. Therefore, the sanitary waste stream generated by the Project will be treated by an onsite wastewater treatment plant.The waste stream is anticipated to contain not only standard sanitary waste but also medical-related liquid wastes that may include bodily fluids, drug and other chemical residues, infectious materials, and related components. If not properly treated and monitored, discharge of this waste stream Hydrology and Water Quality 4.12-20 October 2021