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Project Name: Thelma E. Hieb Revocable Trust r Page 2 of 2 Our Project Number: E07202B Date: January 16, 2008 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. In the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) wells throughout the Sacramento Valley by Bryan (1923). It was thought that ground water at that time was close to "natural" conditions. Based on the work by Bryan, it is estimated that under "natural" conditions, the ground water concentration of nitrate is no more then about 13.5 mg/L- NO3 (3 mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in which nitrate concentrations may be increasing (Hull, 1984). DBCP was not detected in the well water sample. DBCP is a nematocide and soii fumigant for vegetables and grapes. It is thought to cause health problems consisting of kidney damage, liver damage, and cancer. The use of DBCP was discontinued in 1979. The Environmental Protection Agency (EPA) set the maximum contaminant limit (MCL) at 0.2 parts per billion (ppb) because the EPA believes that given present technology and resources, this is the lowest level to which water systems can reasonably be required to remove this contaminant should it occur in drinking water. Conclusion In summary, DBCP was not detected in the well water sample, and the nitrate concentration in ground water was found to be 3.1 mg/L-NO3 which is below the drinking water MCL of 45 mg/L- NO3. Limitations The conclusions of this report are based on the information provided regarding the existing and proposed development, the use of the subject property, and the site conditions as they existed at the time we performed the work. Our professional services were performed, our findings obtained, and our conclusions proposed in accordance with generally accepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings and statements of professional opinion do not constitute a guarantee or warranty, expressed or implied. NEIL O. ANDERSON&ASSOC., INC. r,:4i�rDAV NA�D JELCH Na cy R. m A. Id J. Welch, Principal Ggol ist c,-RrFIED NG St Scie st CEG-2151 CHG-653 PGP- ` 4 �` '"� T � � t� 5T P T�OF r.A&A cc: Louis M. Woehl, 4325 Driftwood Place, Discovery Bay, CA 94505 "04 902 Industrial Way•Lodi,CA 95240.209.367.3701 •Fax 209.369.4228 02007 Neil O.Anderson&Associates.Inc.