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A number of factors could contribute to the reason the well was dry including encrusted <br /> perforations, casing collapse, or bottom intake collapse. <br /> Calculation of Alkalinity Requirement for Nitrification <br /> The nitrate-nitrogen loading calculations on Page 9 of this report are contingent upon the <br /> environmental factors required for nitrification to occur. These conditions include soil pore-space <br /> oxygen content, soil temperature,pH, electrical conductivity, organic matter, cation exchange <br /> capacity, and alkalinity. Alkalinity in wastewater effluent is derived from the on-site well water that <br /> will be provided, in addition to the introduction of wastes to the effluent. Nitrification consumes <br /> approximately 7.1 mg of alkalinity for every mg of ammonia-nitrogen(NH4-N) oxidized. <br /> Nitrification of the average Total Nitrogen(TN)concentration of 103 mg/L, as determined on Page <br /> 8, would require: 103 mg/L NH4-N x 7.1 mg CaCO3=731 mg/L alkalinity. The alkalinity in the <br /> domestic water supply is presently unknown, but probably low and may supply insufficient <br /> alkalinity for nitrification to readily proceed. <br /> E. SURFACE WATER INFORMATION <br /> Storm water management must be an on-site retention basin until public services are provided. <br /> Percolating rainwater from this structure may theoretically provide a water table dilution effect to <br /> percolating wastewater effluent depending upon the siting of each structure. Dilution effects can <br /> only be truly discerned with extensive groundwater monitoring and modeling. According to a <br /> scientific paper authored by Shaw and Turyk (1994),reduction of nitrate concentrations in <br /> groundwater can occur primarily through dispersion,by percolating rainwater, or a cleaner water <br /> source including effluent water recharge. <br /> Climatic Data: Rainfall versus Evapotranspiration <br /> NLS§3.2. It is generally and scientifically accepted that when precipitation exceeds evapotrans- <br /> piration(Eto), deep percolation of surface rainwater may occur. Evapotranspiration refers to water <br /> evaporation that takes place both at the soil surface and transpiration by plants. <br /> The following Table illustrates rainfall and evapotranspiration for the Stockton 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 /> 6 <br /> _j <br /> Chesney Consulting <br />