SU0014502 - Laserfiche WebLink

Home Browse Search

Administrative Draft Environmental Impact Report Gill Medical Center Project Table 4.12-3. RWQCB Basin Plan Limits for NPDES WDR Discharges Standards Tier 3 Constituent Units Basin Plan Limit Title 22 MCLs Zinc pg/L 100 5,000 Cyanide Ng/L 10 150 Perchlorate pg/L NA 6 Notes: Basin Plan Limits are for Receiving Waters with Municipal and Domestic Supply Beneficial Use (MUN)tributary to the San Joaquin River and the Sacramento/San Joaquin Delta. Additional MCLs in CCR Title 22 also apply to volatile organic compounds,non-volatile synthetic organic compounds,disinfection by-products,and radionuclides. The treatment plant design and discharge specifications have not yet been developed and issuance of the NPDES and WDR permits would be subject to the design and performance standards, which are unknown at this time. Thus it is uncertain at this time that whether the treatment system would meet all applicable water quality standards, resulting in a potentially significant impact. With implementation of Mitigation Measure 4.12-1a, this impact would be reduced to less than significant with mitigation incorporated. Mitigation Measures 4.12-1a: Obtain NPDES and WDR permits from the RWQCB Prior to issuing building permits for Phase I of the Project, including for the wastewater treatment system, the Applicant shall complete the design of the treatment system and obtain the necessary NPDES and WDR permits from RWQCB. The Applicant shall provide copies of the NPDES and WDR permits to the County as part of its building permit application submittals. In addition, the Applicant shall provide copies of all monitoring reports required under the NPDES and WDR permits to the County on the same schedule due to the RWQCB, verifying compliance with the permit standards or identifying corrective actions if any exceedances are identified. Implementation of Mitigation Measure 4.12-1 a. would result in a less than significant impact related to surface water and groundwater quality and would ensure compliance with the Basin Plan. Impact 4.12-3: The proposed project would modify drainage patterns on the project site and add impervious surfaces that would increase the amount of stormwater runoff, which could increase erosion, siltation, or flooding that may exceed existing stormwater capacity. Impact Determination: less than significant Threshold: Substantially alter the existing drainage patterns of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would: Hydrology and Water Quality 4.12-23 October 2021