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L %100 S404 <br /> June 10,2005 <br /> NOA Project Number: E05070A <br /> 2.3 Current and Future On-Site Ground Water Uses <br /> No wells exist on the Site. According to Mr.Brian Greer of Raymond Greer Construction, the <br /> proposed project will utilize City water services (personal communication,June 1, 2005). <br /> 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> 3.1 Current Off-Site Sources of Nitrate <br /> We recognize that septic systems, agriculture,and dairies in the area may be the most significant <br /> sources of nitrate. Septic tank use in the vicinity is discussed in Section 3.4 of the SSS. Because no <br /> Lwells are present on the Site and the project will not utilize ground water,no ground water sample �3 <br /> was collected for this report Therefore,it is not possible to consider whether the ground water <br /> aquifer beneath the Site may be experiencing nitrate leaching from various sources in the area over <br /> the long term. <br /> 3.2 Contribution of Rainfall <br /> An 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 /> evapotranspiration for Stockton,California. The estimate first determines whether the average <br /> monthly precipitation exceeds average monthly potential evapotranspiration. If so, then the <br /> difference is potential deep percolation. This method does not consider runoff. See Plate 9 for the <br /> data and calculation. <br /> L <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Stockton is located within evapotranspiration zone number 12. The <br /> average rain fall for the Stockton area was obtained from the Western Regional Climate Center <br /> (www.wrcc.dri.edu), and was found to be 15.98 inches per year for the years 1948 through 2004. <br /> � (3 z� <br /> Based on this method,the average deep percolation of rain for the Stockton area is estimated to be <br /> 4.67 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche and <br /> Finnemore, 1992). <br /> n <br /> 3.3 Current On-Site Sources of Nitrate <br /> Current on-site sources of nitrate include any fertilizers applied to agriculture and the existing on-site (o.) <br /> septic system. <br /> 3.3.1 Existing Septic System <br /> kNo septic systems exist on the Site. <br /> L 3 <br /> L <br />