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n <br /> September 30, 2007 <br /> NOA Project Number: E07141A <br /> 6 j 4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (1998 and 1999ground <br /> water depth and elevation maps were reviewed to determine the ground water Ievels near the site. <br /> PThe Fall 1998 and Spring 1999 maps are the most current maps available from the county. <br /> Examination of these maps indicates that no water level data is available for the Tracy/Banta area, <br /> wrade. <br /> IG e si nd no definite comments as to depth or gradient flow direction can be <br /> t ound water s encountered during the drilling of an' 8.5-footb ring on August 31,2 <br /> FJ4.2 Potential Ground Water Contamination Issues <br /> 1 <br /> Identifying potential groundwater contamination sources was not part of the scope of work for the <br />{ soil suitability study. <br /> I <br /> Potential groundwater contamination can occur from a number of sources which often include leaky + <br /> underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. <br /> Any past agricultural activities, dairies and the present use of septic systems in the area should be <br /> considered potential groundwater contamination sources. Please see section 4.4 for additional water <br /> quality details. <br /> 4.3 Water Sample Location <br /> C;Noell permits we found during filereview at the EHD for the subject property. well water <br /> e was en on September 4, 2007 from the faucet of the s on site by Jessen Welch of our <br /> Fi <br /> 4.4 Water Sample Constituents <br /> F1 The water sample wa traternd-D CP. BCP was not etected in the wa� am le. <br /> Nitrate was fou at 28.0 mg/L-NO3, law-the-maximum contaminant level (MCL) of 45 mg/L- <br /> F1 NO3 set by the U to e analytical reports prepared by FGL Environme e <br /> found in the appendix of this report. <br /> HWell construction, seals, age and depth of the well screens may play significant part in assessing the <br /> levels of Nitrate and DBCP in various aquifers. Without knowing specific details regarding well <br /> construction and condition,it would be difficult to accurately comment on the condition of the / <br /> aquifer. Essentially, the water sample concentration approximately indicates the contaminant <br /> concentration level of the aquifer from which the well is drawing at the time of sampling. <br /> 4 <br /> 0 <br />