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Page 21 and 22 of the DEIR identifies the threshold of significance used to determine potentially significant water quality impacts. The thresholds of significance are from the City of Santa Ana CEQA Checklist and are based on the CEQA Checklist provided in Appendix G of the CEQA Guidelines. Comment Dl-1 The submitted comment states that if a project has the potential to create a major new storm water discharge, the DEIR should consider a quantitative analysis of the anticipated pollutant loads in the storm water discharges to the receiving waters. Page 24 of the DEIR identifies that along Farmers Drive, the 25-Year discharge would be approximately 13.43 cfs and the 100-Year discharge would be approximately 17.61 cfs. Along Orange Road the 25- Year discharge would be approximately 6.1 I cfs and the 100- Year discharge would be approximately 8.09. These flows are a reduction compared to the hydrologic conditions on the project site generated from the former office use on the project site. The reduction in discharge would be due primarily to the increase of pervious surfaces provided on the project site. With this condition, there would be a 6% reduction of peak flows discharged to Farmers Drive and a 25% reduction of peak flows to the intersection of Flower Street and Orange Road. The peak flows from the project are not considered a major new storm water discharge. To mitigate potential water quality impacts associated with storm water runoff generated from the project site, Mitigation Measures WQ-l, WQ-2 and WQ-3 would be implemented. Comment DI-J The submitted comment requests that cumulative impacts of the project with other projects be considered in the DEIR The project site is located within an area that is essentially built out. There are no other proposed projects in the vicinity of the project that would contribute cumulative water quality impacts. Page 22 and 23 of the DEIR does identifY that storm water flows from the project site along with other areas in the City would drain into Santiago Creek, Santa Ana River and the Pacific Ocean and that the proposed project could contribute potential water quality impacts to the receiving waters. Mitigation Measures WQ-l, WQ-2 and WQ-3 have been identified in the DEIR to mitigate potential water quality impacts to the receiving waters. Comment D2 The submitted comment states that Post-Construction Best Management Practices should be consistent with the County of Orange Drainage Area Management Plan. Mitigation Measure WQ-2 on Page 23 of the DEIR requires that the project surface drainage plan depict all applicable Site Design, Structural Source Control and Treatment 75Gn-48