2014-069 - Final Environmental Impact Report No. 2014-01

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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR CITY OF SANTA ANA 5. Environmental Analysis UTILITIES AND SERVICE SYSTEMS Soumz:1B12014 Wastewater Conveyance The project sewer study modeled wastewater flows compared to sewer capacities in the Harbor Corridor Plan buildout conditions. Upgrades were recommended to 48 sewer segments of 119 segments that were modeled. The segments are in Westminster Drive from the Pacific Electric right- of-way west to just west of Harbor Boulevard; in 11T Street from Harbor Boulevard east to Jackson Street; and near the intersection of Harbor Boulevard and McFadden Avenue (see Figures 4.1A and 4.1E in the Sewer Study, Appendix J of this EIR). The existing sewer segments are each 10 or 12 inches diameter, and are all recommended for upgrade to 15 inches diameter (1131 2014). This is a significant impact. Wastewater Treatment Requirements Wastewater treatment requirements for discharges to municipal storm drainage systems (MS4s) are contained in the General Construction Permit, Order No. 2012 - 0006 -DWQ, issued by the State Water Resources Control Board in 2012; and in Order No. 118- 2009 -0030 issued by the Santa Ana Regional Water Quality Control Board in 2009. Plans for water quality protection that would be required for projects developed pursuant to the Corridor Plan — Stormwater Pollution Prevention Plans for construction projects, and Water Quality Management Plans for design and operation of projects — are discussed in Section 5.7, Hydrology and Water Quality, as are Best Management Practices that would be specified in such plans for implementation in those projects. Impacts would be less than significant. Impact 5.14 -2: Adequate water supply and delivery systems are adequate to meet project requirements, however the existing water system may not provide adequate capacity. [Thresholds U -2 (part) and U -4] Impact Analysis: Forecast Project Water Demands The Harbor Corridor Plan consists of an approximately 305 -acre redevelopment within the boundaries of the existing North Harbor Specific Plan (NHSP). The new plan allows for new housing and mixed use development opportunities. Buildout of the Harbor Corridor Plan would generate an additional 3,884 dwelling units, 15,327 residents, 13,721 square feet of commercial space, and approximately 173 additional employees in the plan area. The existing and proposed water use was calculated using two methods. The fast method used the water generation factors, based on data in the City of Santa Ana's 2010 UWMP. The UWMP projects a baseline water usage of 128.1 gallons per capita per day (GPCD), based on a 10 -year range from 1995 to 2005. The Page 5.14 -14 PlaceWorkr Subtotal 1,432,400 1,604 Difference +15,327 residents — +1,149,525 +1,288 +173 employees — +4,325 +5 Subtotal +1,153,850 +1,292 Soumz:1B12014 Wastewater Conveyance The project sewer study modeled wastewater flows compared to sewer capacities in the Harbor Corridor Plan buildout conditions. Upgrades were recommended to 48 sewer segments of 119 segments that were modeled. The segments are in Westminster Drive from the Pacific Electric right- of-way west to just west of Harbor Boulevard; in 11T Street from Harbor Boulevard east to Jackson Street; and near the intersection of Harbor Boulevard and McFadden Avenue (see Figures 4.1A and 4.1E in the Sewer Study, Appendix J of this EIR). The existing sewer segments are each 10 or 12 inches diameter, and are all recommended for upgrade to 15 inches diameter (1131 2014). This is a significant impact. Wastewater Treatment Requirements Wastewater treatment requirements for discharges to municipal storm drainage systems (MS4s) are contained in the General Construction Permit, Order No. 2012 - 0006 -DWQ, issued by the State Water Resources Control Board in 2012; and in Order No. 118- 2009 -0030 issued by the Santa Ana Regional Water Quality Control Board in 2009. Plans for water quality protection that would be required for projects developed pursuant to the Corridor Plan — Stormwater Pollution Prevention Plans for construction projects, and Water Quality Management Plans for design and operation of projects — are discussed in Section 5.7, Hydrology and Water Quality, as are Best Management Practices that would be specified in such plans for implementation in those projects. Impacts would be less than significant. Impact 5.14 -2: Adequate water supply and delivery systems are adequate to meet project requirements, however the existing water system may not provide adequate capacity. [Thresholds U -2 (part) and U -4] Impact Analysis: Forecast Project Water Demands The Harbor Corridor Plan consists of an approximately 305 -acre redevelopment within the boundaries of the existing North Harbor Specific Plan (NHSP). The new plan allows for new housing and mixed use development opportunities. Buildout of the Harbor Corridor Plan would generate an additional 3,884 dwelling units, 15,327 residents, 13,721 square feet of commercial space, and approximately 173 additional employees in the plan area. The existing and proposed water use was calculated using two methods. The fast method used the water generation factors, based on data in the City of Santa Ana's 2010 UWMP. The UWMP projects a baseline water usage of 128.1 gallons per capita per day (GPCD), based on a 10 -year range from 1995 to 2005. The Page 5.14 -14 PlaceWorkr