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E. SURFACE WATER INFORMATION <br /> N Storm water management must be by 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 evapotranspiration <br /> (Eto), deep percolation of surface rainwater may occur. Evapotranspiration refers to water evaporation that <br /> takes place both at the soil surface and transpiration by.plants. <br /> The following Table illustrates rainfall and evapotranspiration for the Stockton area: Precipitation data was <br /> obtained from the Soil Survey of San Joaquin County. The conservative"2 years in 10"data was used and <br /> not the"average rainfall"data. Evapotranspiration data was obtained from the California Irrigation <br /> Management Information System(CIMIS): <br /> TABLE 3 <br /> PRECIPITATiON,AND,EtoDATA FOR STOCK <br /> HM <br /> TON;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 4.42 1.24 0.04 3.18 . <br /> February 3.20 1.96 0.07 . 1.24 <br /> March 3.43 3:41 0.11 -- <br /> April 1.92 5:10 0.17 <br /> May 0.50 6.82 0.22 <br /> June 0.25 7:80 0.26 <br /> July 0.23 8.06 0.26 -- <br /> August 0.40 7,13 0.23 -- <br /> September 0.76 5.40- 0.18 �- <br /> October 1.39 3.72 0.12 -- <br /> November 3.31 1.80: 0.06 1.51 <br /> December 3.67 0 0.03 2.74 <br /> ?� TOTALS(in.) 1892 53.4 '1. ------ $.67' 1 <br /> 6 <br /> Chesney Consulting <br />