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May 25,2006 <br /> NOA Project Number: E06015A <br /> 2.3 Current and Future On-Site Ground Water Uses <br /> L The use of groundwater for drinking water is planned for the proposed development.There is <br /> currently one well on the Site. According to the property owner,Ted Green of Pace Supply,this <br /> well will be used for the proposed supply warehouse on the site. <br /> 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> L3.1 Current Off-Site Sources of Nitrate <br /> L Septic systems,agriculture, and dairies in the area may be the most significant sources of nitrate in <br /> the county. Septic tank use in the vicinity discussed in Section 3.4 was found to be moderate. The / <br /> onsite water well was tested for nitrate and DBCP. Nitrate was not detected in the well water <br /> sampled.The maximum contaminant level (MCL) set by the US EPA is 45 mg/L-NO,. DBCP was <br /> Lnot detected in the water sample. <br /> 3.2 Contribution of Rainfall <br /> LAn estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. The <br /> estimate of deep percolation of rain is based on the average monthly precipitation of rain fall and <br /> Levapotranspiration for Northern Stockton, California. The estimate first determines whether the <br /> average monthly precipitation exceeds average monthly potential evapotranspiration. If so, then the <br /> difference is potential deep percolation. This method does not consider runoff. See PlatcAlfor the <br /> data and calculation. <br /> L <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> I Information System (CIMIS). Stockton is located within evapotranspiration zone number 12. The <br /> average rain fall for the North Stockton area was obtained from the Western Regional Climate <br /> Center (www.wrcc.dri.edu), and was found to be 15.98 inches per month for the years 1965 through <br /> L 1977. <br /> Based on this method, the average deep percolation of rain for the North Stockton area is estimated <br /> to be 4.67 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche <br /> and Finnemore, 1992). <br /> 3.3 Current On-Site Sources of Nitrate <br /> Current on-site sources of nitrate include the current septic system on the property. The destruction / <br /> of this septic system is proposed during construction of the proposed wholesale warehouse on the <br /> site. No additional sources of nitrates besides septic effluent,groundwater and rainfall are ` <br /> recognized. <br /> C <br /> fr <br /> 4 <br /> i <br />