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NLS§2.1. Although a,domestic well exists on the property, it is non-operational since there s no <br /> c—electricity to it. Consequently, a water sample was no rt et�ieved from this well for analysis of nitrate <br /> aat&aWalinity-Residences on Clover Road and ttte surrounding Larch-Clover area are served by <br /> City of Tracy water. <br /> Discussion on the Alkalinity Requirement for Nitrification <br /> The nitrate-nitrogen loading calculation results are contingent upon the environmental factors <br /> required for nitrification to occur. These conditions include soil pore-space oxygen content, soil <br /> temperature,pH, electrical conductivity, organic matter, cation exchange capacity, and alkalinity. <br /> Alkalinity in wastewater effluent is derived from City water, in addition to the introduction of <br /> wastes. Nitrification consumes approximately 7.1 mg of alkalinity for every mg of ammonia- <br /> nitrogen(NH,N) oxidized. Nitrification of the average Total Nitrogen (TN) concentration of 62 <br /> mg/L, as determined below, would require: 62 mg/L NH,-N x 7.1 mg CaCO3 =440 mg/L <br /> alkalinity. The alkalinity in groundwater in this locale is typically 150-200 ppm. Therefore, soil <br /> alkalinity and alkalinity from wastes must provide a significant alkalinity concentration for <br /> nitrification to occur. <br /> SURFACE WATER INFORMATION <br /> ,Climatic Data: Rainfall versus Evapotranspiration <br /> NLS§3.2. ,Iris generally and scientifically accepted that when precipitation exceeds <br /> evapotranspiration (Eto), deep percolation of surface rainwater may occur. Evapotranspiration <br /> `- -refer water evaporation that takes place both at the soil surface and transpiration by plants. <br /> The following Table illustrates rainfall and evapotranspiration for the Tracy area. Precipitation <br /> data was obtained from the Soil Survey of San Joaquin County. The conservative "2 years in 10" <br /> data was used and not the "average rainfall" data. Evapotranspiration data was obtained from the <br /> California Irrigation Management Information System (CIMIS): <br /> TABLE 3 <br /> PRECIPITATION AND Eto DATA FOR TRACY, CA <br /> Month 2 Years in 10 will have more Eto Average Potential Deep <br /> precipitation than: (in/mo) Percolation (in/mo) <br /> (in/mo) (in/day) <br /> January 2.93 1.55 0.05 1.38 <br /> February 2.21 2.24 0.08 <br /> March 2.38 3.72 0.12 <br /> April 1.51 5.10 1 0.17 <br /> May 0.71 6.82 0.22 <br /> June 2.09 7.80 0.26 <br /> July 0.28 8.68 0.28 <br /> Page 3 of 12 <br />