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Fj� n F! November 8, 2005 NOA Project Number: E05123B F1constituents of concern. 2.0 GROUND WATER ANALYSIS F1 1 2.1 Regional Ground Water 4 A discussion of regional ground water,including depth to ground water and directional ground water gradient,is included in Section 4.1 of the SSS. Ground water lies between 90 and 100 feet below ground surface and flows at a gradient of about 20 feet per mile to the east in the vicinity of the Site in 1999. 2.2 Potential Ground Water Contamination Issues A discussion of issues related to potential groundwater contamination is included in Section 4.2 of the SSS. F12.3 Current and Future On-Site Ground Water Uses ' No domestic water well-exists on 8.2 Acre portion of the property. No residential uses exist on the site. The site presently contains vineyards. 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER 3.1 Current Off-Site Sources of Nitrate We recognize that septic systems, agriculture, and dairies in the area may be the most significant sources of nitrate. Septic tank use in the vicinity is discussed in Section 3.4 of the SSS. I The water sample wa yz for nitrate and DBCP. DBCP was not detected in the water sample. Nitrate was found t 13.9 PWLN03,below the maximum contaminant level (MCL) of 45 mg/L- NO3 set by the Unit aces EPA. Details regarding the water sample analysis can be found in Section 4.4 of the SSS. Fi 3.2 Contribution of Rainfall An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. The estimate of deep percolation of rain is based on the average monthly precipitation of rain fall and evapotranspiration for the Lodi area of California. An estimate of potential deep percolation of rain determines whether the average monthly precipitation exceeds average monthly potential evapotranspiration. if so, then the difference is potential deep percolation. This method does not consider runoff: See Plate 2 for the data and calculation. 3