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t ` December 23, 2005 NOA Project Number: E05174A - /4.0 GROUND WATER INFORMATION /4.1 Ground Water Depth and Gradient =� The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground water depth and elevation maps were reviewed to determine the ground water levels near the Site. ' The Fall 1998 and Spring 1999 maps are the most current official maps available from the County. According to these maps (Plates 3-6), the ground water depth and elevation below the site is not Fj indicated on the maps. It appears that ground water may be greater than 200 feet in the area. Ground water flow direction and gradients is not available from the maps. FNo ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the drilling of the percolation test holes to a depth three feet on December 13, 2005, k i F 4.2 Potential Ground Water Contamination Issues y Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. Potential ground-water contamination can occur from a number of sources which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Any past agricultural activities and the present use of septic systems in the area should be considered potential ground-water contamination sources. Improper handling of compose or chicken manure may pose a threat to surface water quality in the area. k� 4.3 Water Sample Location One water sample was taken on December 15, 2005 from a spigot in the main processing building west side central in the building, from the water faucet by Nancy Rosulek of our office. According to Mx. Calderon, all the wells are "tied together" into one water supply system. Additional details of the system are not available. An assumption should be made that the water sample obtained may not reflect the water quality from only one water well. I 4.4 Water Sample Constituents S The result of the water sample for nitrate and DBCP was not available at the time of this report. The results will be sent to EHD once they are sent to our office. ` The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County and other parts of the Central Valley. Nitrate in ground water occurs as a result of the application of fertilizers,livestock waste, and untreated septic tank waste. Nitrate is mobile and often accumulates in the shallow ground water zones. ly 6 P M � 'A4 k t I