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December 7, 2007 <br /> NOA Project Number:E07143B <br /> Page 2 <br /> In the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) <br /> wells throughout the Sacramento Valley by Bryan (1923). It was thought that ground water at that <br /> time was close to "natural" conditions. Based on the work by Bryan, it is estimated that under <br /> "natural"conditions, the ground water concentration of nitrate is no more then about 13.5 mg/L- <br /> NO3 (3 mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in which nitrate <br /> concentrations may be increasing (Hull, 1984). <br /> DBCP was not detected in the well water sample. DBCP is a nematocide and soil fumigant for <br /> vegetables and grapes. It is thought to cause health problems consisting of kidney damage, liver <br /> damage, and cancer. The use of DBCP was discontinued in 1979. The Environmental Protection <br /> Agency (EPA) set the maximum contaminant limit (MCL) at 0.2 parts per billion (ppb) because the <br /> EPA believes that given present technology and resources, this is the lowest level to which water <br /> systems can reasonably be required to remove this contaminant should it occur in drinking water. <br /> Conclusion <br /> In summary, DBCP was not detected in the well water sample, and the nitrate concentration in <br /> ground water was found to be 33.5 mg/L-NO3 which is below the drinking water MCL of 45 mg/L- <br /> NO3. <br /> Limitations <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development, the use of the subject property, and the site conditions as they existed at <br /> the time we performed the work. Our professional services were performed, our findings obtained, <br /> and our conclusions proposed in accordance with generally accepted engineering principles and <br /> practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings <br /> and statements of professional opinion do not constitute a guarantee or warranty, expressed or <br /> implied. <br /> NEIL O. ANDERSON&ASSOC., INC. <br /> Na+y R. Kr r, B.A. <br /> Statt Scientis <br /> cc: John Trinkle, 24551 Kasson Road, Banta, California 95304 <br />