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April 11,2007 <br /> NOA Project Number:E07045A <br /> Page 2 <br /> In the early 1900s,natural levels of nitrate in ground water were measured in forty-three (43) wells <br /> throughout the Sacramento Valley by Bryan (1923). It was thought that ground water at that time <br /> was close to "natural' conditions. Based on the work by Bryan,it is estimated that under"natural' <br /> conditions,the ground water concentration of nitrate is no more then about 13.5 mg/L-NO3 (3 <br /> mg/1,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 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 non-detectable in the well,and the nitrate concentration in ground water <br /> was found to be 0.40 mg/L-NO3 which is well below the drinking water MCL of 45 mg/L-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 the <br /> time we performed the work. Our professional services were performed, our findings obtained,and <br /> 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 watran ed or <br /> implied .� <br /> NEIL O.ANDERSON&ASSOC,INC <br /> N cy amer, A. David Welch,Principal Geologist` .-- <br /> Staff Scientist CEG-2151, CHG-653,PGP-1049 <br /> cc:Vern Vierra, 151 West Taddei Road,Acampo, California 95220 <br />