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Nitrification of the average Total Nitrogen(TN) concentration of 82 mg/L, as determined on Page 8 would require: 82 mg/L NH4-N x 7.1 mg CaCO3=582 mg/L alkalinity. The alkalinity in the water table water / was tested to be 439 ppm. Consequently,nitrification may be slightly inhibited to an indeterminable degree. E. SURFACE WATER INFORMATION Storm water management will consist of an existing on-site retention basin located at the northwest comer of the property. Percolating stormwater may produce dilution effects to the underlying water table. Groundwater dilution effects can only be truly discerned with groundwater monitoring and modeling. According to a scientific paper authored by Shaw and Turyk(1994),reduction of nitrate concentrations in groundwater can occur primarily through dispersion,or by percolating rainwater, or a water source including effluent water recharge. Climatic Data: Rainfall versus Evapotranspiration NLS§3.2. It is generally and scientifically accepted that when precipitation exceeds evapotranspiration (Eto), deep percolation of surface rainwater can occur. Evapotranspiration refers to water evaporation that takes place both at the soil surface and transpiration by plants. The following Table illustrates rainfall and evapotranspiration for the Stockton area. Precipitation data was obtained from the Soil Survey of San Joaquin County. The conservative"2 years in 10"data was used and not the"average rainfall"data. Evapotranspiration data was obtained from the California Irrigation Management Information System(cutts): TABLE 5 PRECIPITATION AND Eto DATA FOR STOCKTON,CA Month 2 Years in 10 will have more Eto Average Potential Deep precipitation than: (in/mo) Percolation(in/mo) (in/mo) (in/day) January 4.42 1.24 0.04 3.18 February 3.20 1.96 0.07 1.24 March 3.43 3.41 0.11 April 1.92 5.10 0.17 May 0.50 6.82 0.22 June 0.25 7.80 0.26 July 0.23 8.06 0.26 -- August 0.40 7.13 0.23 September 0.76 5.40 0.18 October 1.39 3.72 0.12 November 3.31 1.80 0.06 1.51 December 3.67 0.93 0.03 2.74 TOTALS(in.) 18.92 53.4 ------ 8.67 5