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Mr. George Lockwood September 7, 2004 Page 7 A review of the contour figures for average groundwater elevations, average nitrate concentrations, and average EC levels for the period August 2001 through May 2004 yield the following general observations: 1. Groundwater is migrating to City property from the northwest. 2. The quality of the water migrating to City property is not well defined by the information gathered to date. However, based on the data at hand, it appears that the nitrate concentration of the water may be 10 to 20 mg/L, which is equal to or higher than that for the water located inside City property. The EC value of the migrating water appears to be lower than that of the water inside City property. 3. Groundwater is migrating away from City property to the southwest, south, and east. The flow is predominantly to the east. 4. The quality for the groundwater to the southwest of City property is quite good. Nitrates were not detected in two of the three monitoring wells, and average EC values are in the 450 to 650 umhos/cm range. This water quality is better than that of the water inside City property. 5. The quality of the groundwater to the south of City property is not well defined by the information gathered to date. However, based on the data at hand, it appears that the water is relatively low in nitrate, approximately 5 mg/L. This is lower than that of the water located inside the adjacent City property. The water appears to have an EC value of 1,300 umhos/cm or higher, which is higher than that of the water located inside the adjacent City property. 6. The water to the southeast of City property is relatively high in nitrate, approximately 15 mg/L, and has an EC value of over 1,300 umhos/cm. Both of these parameters are higher than those for the water located inside the adjacent City property. 7. The water quality to the east of City property is difficult to describe in simple terms. The water is relatively high in nitrate., approximately 10 to 25 mg/L, with an EC value of between 1,100 and 1,400 umhos/cm. In general, these parameters are equal to or lower than those for the water located inside the adjacent City property. 8. The water to the northeast of City property is relatively high in both nitrate and EC. The nitrate concentration is approximately 25 mg/L and the EC value is approximately 1,400 umhos/cm. The nitrate level is higher than that of the water inside the adjacent City property. The EC value is equal to or lower than that of the water inside the adjacent City property. 9. The City's reclamation activities appear to be negatively impacting the nitrate concentrations and EC values within limited areas of City property. However, there are many anomalies in the data. For example, why is the nitrate concentration so high in WSM4? Why is the EC value so low in WSM3? Why is the EC value so high in WSM2? LLOCKW OOD_NPD ESPERMIT.DOC