Laserfiche WebLink
February 2,2006 <br /> NOA Project Number: E05058B <br /> 2.3 Current and Future On-Site Ground Water Uses <br /> There are currently no wells on the Site.The agricultural property is provided water from the Banta <br /> Carbona Irrigation Canal.There is no development proposed for the subject property. <br /> 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> 3.1 Current Off-Site Sources of Nitrate <br /> Septic systems,agriculture, and dairies in the area may be the most significa�sources of nitra . <br /> Septic tank use in the vicinity discussed in Section 3.4 was found to be low. No water sa=high as <br /> o <br /> collected or analyzed for the subject prerty.A discussion of issues related to potential <br /> nitrates in the area is included inFS-esti V4 <br /> of the SSS. <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 Tracy,California.The estimate first determines whether the average monthly ; <br /> precipitation exceeds average monthly potential evapotranspiration. If so,,--then e difference is <br /> potential deep percolation. This method does not consider runoff. Se Plate for the data and <br /> calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Tracy is located within evapotranspiration zone number 12. The <br /> average rain fall for the East Tracy areataus from the Western Regional Climate Center <br /> (www.wrcc.dri.edu), and was found to a 9.94 inc s per month for the years 1965 through 1977. <br /> Based on this method, the average deep percolation of rain for the East Tracy area is estimated to be <br /> 1.27 inches. The nitrate concentration of rain fall was estimated to b mg/L-N ntzsche and <br /> Finnemore, 1992). <br /> 3.3 Current On-Site Sources of Nitrate / <br /> The site is vacant land. No sources of nitrates besides rainfall are recognized. <br /> 3 <br />