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3 a Table 2-1 (continued) <br /> Summary of Impacts and Mitigation Measures (Applicable to Program and Project-Specific Impacts) <br /> Impact Significance Mitigation Measure Significance <br /> before Mitigation after Mitigation <br /> Identify emergency procedures for responding to spills; <br /> • Identify BMPs that shall be used in all subsequent site- <br /> development activities; <br /> • Identify personnel training requirements and procedures that <br /> will be used to ensure that workers are aware of permit <br /> requirements and proper installation and performance <br /> inspection memods Tor specified BMPs; <br /> Identify the appropriate personnel responsible for supervisory <br /> duties related to implementation of the SWPPP;and <br /> Require all construction contractors to retain a copy of the <br /> approved SWPPP on the construction site. <br /> 4.8.2.Water Quality—Long-Term Water Quality Effects of LTS No mitigation required. LTS <br /> Urban Runoff.The proposed project would convert agricultural <br /> lands to residential and commercial uses and thereby change the <br /> m amount,timing,and content of potential waste discharges in <br /> stormwater runoff to Mountain House Creek and Old River. <br /> However,the combination of nonstructural and structural BMPs <br /> proposed for the project stormwater drainage system would reduce <br /> the overall amount of potential contaminant discharges compared <br /> to existing conditions.A less-than-significant impact would occur. <br /> d 4.9 Public Health and Safety <br /> x <br /> 4.9.1.Public Health and Safety—Possible Exposure to Pre- S 4.9-1.Public Health and Safety—Possible Exposure to Pre- LTS <br /> Existing Hazardous Materials During Construction.The Existing Hazardous Materials During Construction. The College <br /> m proposed project could unearth or otherwise disturb pre-existing Park developers shall implement the following measures: <br /> hazardous materials at the project site during construction, . Project grading,excavation,and other earth-moving activities at <br /> g potentially exposing construction workers or others to hazardous the project site and off-site infrastructure locations shall be <br /> materials.A significant impact would occur.0 monitored at the County's discretion by qualified hazardous <br /> Cn <br /> materials experts(either qualified County staff or consultants) <br /> for signs of potential pesticide,hydrocarbon,or other <br /> contamination. If the County or consultants observe soil <br /> w discoloration,noxious odors,or other signs of potential <br /> a = contamination, Phase 11 testing(excavation,laboratory testing <br /> of soil,possibly groundwater testing)shall be undertaken,and <br /> any recommendations made by the consultants shall be <br /> M <br /> 1 I <br />