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HomeMy WebLinkAboutTechnical Report 8 - Water System EvalutionMaria Miller May 28, 2024 Page 2 The proposed land use changes will reduce the amount of single family dwelling units and increase the amount of multi-family dwelling units within Village 7; however, the proposed changes would result in no net change to the residential dwelling unit count of 1,456 presented in the Otay Ranch General Development Plan for Village 7. To implement the proposed land use changes, amendments to the Chula Vista General Plan, Otay Ranch General Development Plan, and the Village 7 SPA Plan are necessary. The March 2004 Conceptual Water and Recycled Water Study for Village 7 was prepared as a supporting document to the project’s Environmental Impact Report dated October 12, 2004. More recently, a Subarea Master Plan (SAMP) dated November 2004 was prepared and approved by the Otay Water District (OWD). The purpose of this memorandum is to evaluate the impact of the proposed land use changes for Village 7 on the findings from these previous studies. Village 7 SPA Amendment Summary A summary of proposed changes to the Village 7 land use plan is provided as follows: • Rename the western portion of Parcel R-3 into a separate Parcel R-8. Parcel R-8 will be located adjacent to La Media Road. • Assign 43 units to Parcel R-3 and change the land use designation in Parcel R-3 from Single Family to Residential Multi-Family. • Assign 121 units to Parcel R-4 and change the land use designation in Parcel R-4 from Single Family to Residential Multi-Family. • Assign 123 units to Parcel R-8 and change the land use designation (based on Parcel R-3 land use designation) in Parcel R-8 from Single Family to Residential Multi- Family. Maria Miller May 28, 2024 Page 3 Proposed Land Use Plan The project does not propose changes to the backbone street alignments for Village 7 but does involve adjustments to the land use and residential unit count of Parcels R-3 and R-4, and the addition of Parcel R-8. A land use plan and site utilization table for the proposed changes are included in Attachment 1 for reference. Water Demand Projection – Approved Plan Table 1 summarizes the projected average water demands for Village 7 based on the approved land use plan as presented in the March 2004 Conceptual Water and Recycled Water Study. Table 2 summarizes the projected average day water demands from the November 2004 SAMP for Village 7. The difference in demand is based on preliminary lotting studies completed after the March 2004 Study. TABLE 1 OTAY RANCH VILLAGE 7 PROJECTED WATER DEMAND (MARCH 2004 STUDY) Land Use Proposed Units Demand Factor Average Demand, gallons per day (gpd) SF Residential 1,053 units 500 gpd/unit 526,500 MF Residential 448 units 300 gpd/unit 134,400 Elementary School 11.1 acres 1,785 gpd/acre 19,814 Middle School 26.3 acres 1,785 gpd/acre 46,946 High School 55.8 acres 1,785 gpd/acre 99,603 Commercial 3.7 acres 1,785 gpd/acre 6,604 Town Square 1.9 acres 2,155 gpd/acre 4,094 Park 7.6 acres 2,155 gpd/acre 16,378 Community Purpose Facility 4.1 acres 893 gpd/acre 3,661 TOTAL 858,000 Maria Miller May 28, 2024 Page 4 TABLE 2 OTAY RANCH VILLAGE 7 PROJECTED WATER DEMAND (NOVEMBER 2004 SAMP) Land Use Proposed Units Demand Factor Average Demand, gallons per day (gpd) SF Residential 1,011 units 500 gpd/unit 505,500 MF Residential 444 units 300 gpd/unit 133,200 Elementary School 11.1 acres 1,785 gpd/acre 19,814 Middle School 26.3 acres 1,785 gpd/acre 46,946 High School 55.8 acres 1,785 gpd/acre 99,603 Commercial 3.7 acres 1,785 gpd/acre 6,604 Town Square 1.9 acres 1,785 gpd/acre 3,391 Community Purpose Facility 2.3 acres 893 gpd/ace 2,054 TOTAL 817,112 Water Demand Projection – Proposed Plan (SPA Amendment) Table 3 summarizes the projected average water demands for Village 7 based on the proposed SPA Amendment. This projection uses current water demand factors from the 2015 OWD Water Master Plan. The decrease in water demand factors compared to the 2004 studies is due to water conservation efforts in recent years. Maria Miller May 28, 2024 Page 5 TABLE 3 OTAY RANCH VILLAGE 7 PROJECTED WATER DEMAND (SPA AMENDMENT) Land Use1 Proposed Units Demand Factor Average Demand, gallons per day (gpd) SF Residential 721 units 435 gpd/unit 313,635 MF Residential 735 units 170 gpd/unit 124,950 Elementary School 11.5 acres 1,428 gpd/acre 16,422 High School 53.9 acres 1,428 gpd/acre 76,969 Commercial 3.7 acres 1,607 gpd/acre 5,946 Town Square 1.9 acres 1,607 gpd/acre 3,053 Park2 7.6 acres 0 gpd/acre 2,160 Community Purpose Facility 4.1 acres 714 gpd/acre 2,927 TOTAL 546,062 1. The Middle School and CPF-4 sites that were included in the original SPA for Village 7 are excluded from Table 3 (SPA Amendment), as they are now part of Village 8 West. 2. Parks are irrigated with recycled water, but a nominal amount of potable use has been estimated. In comparing the projections from Tables 1 and 2 to Table 3, the proposed SPA Amendment will reduce previous water demand projections by approximately 36.4 percent compared to the March 2004 Study and by approximately 33.2 percent compared to the November 2004 SAMP. This decrease in water demand for Village 7 is a result of OWD’s reduced water demand factors, the decrease in total units from the March 2004 Study, and the increase in multi-family dwelling units (and corresponding decrease in single family dwelling units) from the 2004 Studies. This decrease in local demands will not change backbone water line sizing for the project. A SAMP Amendment that reflects the land use changes proposed in this SPA Amendment for Village 7 will need to be prepared for review and approval by the OWD prior to final engineering plan approvals. Maria Miller May 28, 2024 Page 6 Water Supply Assessment From a water supply planning standpoint, the proposed SPA Amendment results in a water supply projection of 611 acre-feet per year for Village 7. In comparison to the 2004 Water Supply Assessment and Verification report for Village 7 that was approved by the OWD Board of Directors on March 4, 2004, that estimated a total water demand of 936 acre-feet per year, this represents a reduction of approximately 34.7 percent. Thus, current water demand projections for the project are well below the water supply planning numbers that were estimated during previous project approvals. The decrease in water supply projection is due to water conservation efforts in recent years. Conclusion The proposed SPA Amendment for Village 7 will reduce water demands from the projections in the March 2004 Study by approximately 36.4 percent for Village 7 and by approximately 33.2 percent from the projections in the November 2004 SAMP. These changes in local demand will not impact the backbone water line sizing for the project. From a water supply planning standpoint, the decrease in demand represents a 325 acre-feet per year reduction to the prior estimate which is approximately 34.7 percent lower than the projections in the Water Supply Assessment and Verification Report approved by OWD on March 4, 2004. Therefore, there will be no impact on either the proposed water line sizing for the project or water supply for the area as a result of the proposed SPA Amendment for Village 7. FF:ah ATTACHMENT 1 SITE UTILIZATION PLAN AND LAND USE SUMMARY TABLE INTRODUCTION SPA PLAN Village 7 Site Utilization Plan Exhibit 1.6 INTRODUCTION SPA PLAN Village 7 Land Use Districts Exhibit PC-1 Village Seven Site Utilization Table RESIDENTIAL USE Neighborhood Land Use LU District Acres DU du/ac R-1 Single-Family Detached SF4 53.1 346 6.5 R-2 Single-Family Detached SF4, RM1 51 375 7.4 Sub-total single-family: 721 R-3 Multi-Family RM1 2.4 43 17.9 R-4 Multi-Family RM2 3.1 121 39 R-5 Multi-Family RM1 14.5 132 9.1 R-6 Multi-Family RM2 12.3 193 15.7 R-7 Multi-Family RM2 7.9 123 15.6 R-8 Multi-Family RM1 8.3 123 14.8 Sub-total multi-family: 735 Total Residential 152.6 ac. 1,456 9.5 NON-RESIDENTIAL USE Neighborhood Land Use LU District Acres P-1 Public Park P 7.6 CPF-1 Private Park CPF 1.1 CPF-2a Private Park CPF 0.9 CPF-2b CPF CPF 1.0 *Area included in R-3 S-1 High School S 53.9 S-3 Elem. School S 11.5 OS Open Space OS 42.6 Total Non-Residential 118.6 ac. FUTURE DEVELOPMENT AREA - CONCEPTUAL USES (REQUIRES A SPA AMENDMENT TO OBTAIN DEVELOPMENT APPROVAL) Neighborhood Land Use LU District Acres R-9 Residential Undesignated 42 MU Mixed-Use Undesignated 3.7 OS Open Space Undesignated 3 TS-1 Town Square Undesignated 1.9 CPF-3 CPF Undesignated 1.1 Total Future Development 51.7 ac. VILLAGE TOTAL 321.9 ac.