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` September 10, 2004 <br /> NOA Project Number: E040104A <br /> Average potential evapotranspiration was obtained from the California Irrigation <br /> Management Information System (CIMIS). Stockton is located within evapotranspiration <br /> zone number 12. The average rain fall for the Stockton area was obtained from the Western <br /> v Regional Climate Center (www.wrcc.dri.edu), and was found to be 1.16 inches per month for <br /> the years 1965 through 1977. <br /> Based on this method, the average deep percolation of rain for the Stockton area is estimated <br /> to be 3.16 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N <br /> V (Hantzsche and Finnemore, 1992). <br /> 3.3 Current On-Site Sources of Nitrate <br /> 6. Current on-site sources of nitrate include any fertilizers applied to agriculture and the existing <br /> on-site septic system. <br /> 3.3.1 Existing Septic System <br /> One septic system currently exists on Parcel 6 of the Site. This septic system services the <br /> existing residence. The calculated daily flow from this source is determined in Section 3.4, <br /> below. <br /> 3.3.2 Agricultural Contribution <br /> Mr. Greg Arnaudo indicated that his fertilizer program is directed by Mr. Phil Romina of <br /> Simplot Grower Solutions, Lodi (personal communication, September 1, 2004). Because the <br /> ` fertilization is handled by a licensed professional, it is assumed that an appropriate quantity of <br /> fertilizer is being applied. In addition,the alfalfa crop appears healthy, so the field is assumed <br /> to be "in balance," with the proper nutrients and irrigation applied. The irrigation water and <br /> b. nitrogen provided to the crops have not be considered in the nitrate loa tng c cu atton or <br /> this reason. ....., . ,. ._ <br /> 3.4 Future On-Site Sources of Nitrate <br /> 3.4.1 Quantity and Quality of Domestic Wastewater From Proposed Project <br /> The following discussion is for determining the long-term waste water flow generated from <br /> ` the proposed residences for the nitrate loading analysis and should not be used for septic <br /> system design purposes. Typically, use estimates for the sizing of septic systems include a peak <br /> use factor, whereas the numbers discussed here are based on long-term averages. <br /> 4 I <br />