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River Islands Development at Lathrop January 2021 <br /> Final River Islands Potable Water Technical Report—Rev 3 #6520 <br /> Table 2-2: River Islands— Phase I and II Land Uses <br /> Phase I & II <br /> Phase I Phase II (Total) <br /> No. of Units No. of Units No. of Units <br /> Land Use or Acreage or Acreage or Acreage <br /> Low Density Residential (per DU) 3,130 4,061 7,191 <br /> Medium Density Residential (per DU) 486 3,150 3,636 <br /> High Density Residential (per DU) 668 3,515 4,183 <br /> Commercial (per acre) 172.0 115.2 287.2 <br /> Industrial (per acre) 0.0 0.0 0.0 <br /> Parks (per acre) 42.3 22.8 65.1 <br /> Schools/ Institutional (per acre) 19.4 42.4 61.8 <br /> 2.2 Average Day Demands <br /> The ADDs are determined by each parcel's average day demand factor, listed in the City of Lathrop August <br /> 2020 Updated Demand Projections (See Appendix C), multiplied by the total number of dwelling units or <br /> applicable acreage (refer to Table 2-1). Per the City's Water Master Plan, an additional 5% water loss <br /> factor shall be applied to the ADD to account for non-revenue water and preventing the system from being <br /> undersized. <br /> Table 2-3 presents the Average Day Demand for Phase I and II of River Islands which is estimated to be <br /> 4,392,756 gallons per day (GPD) or 3,051 gallons per minute (GPM). <br /> Table 2-3: River Islands— Phase I and II Average Day Demands <br /> ADD Demand <br /> Factor ADD ADD <br /> Phase I &II ADD Demand (GPD per DU or (GPD) (GPM) <br /> (Total) Factor Acre) W/5% W/5% <br /> No. of Units (GPD per DU or W/5%Loss Loss Loss <br /> Land Use or Acreage Acre) Factor Factor Factor <br /> Low Density Residential (per DU) 7,191 315.0 330.8 2,378,423 1,652 <br /> Medium Density Residential (per DU) 3,636 235.0 246.8 897,183 623 <br /> High Density Residential (per DU) 4,183 135.0 141.8 592,940 412 <br /> Commercial (per acre) 287.2 860.0 903.0 259,328 180 <br /> Industrial (per acre) 0.0 1,200.0 1,260.0 0 0 <br /> Parks (per acre) 65.1 2,450.0 2,572.0 167,547 116 <br /> Schools/Institutional (per acre) 61.8 1,500.0 1,575.0 97,335 68 <br /> Subtotal 4,392,756 3,051 <br /> 2.3 Maximum Day Demands and Peak Hour Demands <br /> Per Section 4-4.213 in the City's Standards, MDD is defined as 1.7 times the ADD, while PHD is defined as <br /> 3.4 times the ADD. Table 2-4 and Table 2-5 show the maximum day and peak hour demands which <br /> equates to 7,467,686 GPD (5,186 gpm) and 14,935,372 GPD (10,372 GPM) respectively. <br /> 9 <br />