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I - . September 9,2005 NOA Project Number: E05112A Page 5 I The Fall 1998 and Spring 1999 maps are the most current maps available from the county. LExamination of these maps indicates that no water level data is available for the Tracy/Banta area, which includes the Site, and no definite comments as to depth or gradient flow direction can be made. Based on our experience in the area,our office estimates that,at its shallowest,the ground Lwater in the area lies between 10 and 15 feet below the ground surface. On August 29,2005, our office drilled a groundwater boring on the subject property to a depth of 8.5 feet;no groundwater was encountered. L 4.2 Potential Ground Water Contamination Issues I L Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. LPotential ground-water contamination can occur from a number of sources which often include leaky underground storage tanks, agricultural activities,dairies, septic systems, and storm water infiltration. Any past agricultural activities and the present use of septic systems in the area should be considered L potential ground-water contamination sources. Please see section 4.4 for additional water quality details. 4.3 Water Sample Location L According to Mr. Mike Bogetti (personal communication August 25, 2005),one residential well is located on the property. No permits were found for the subject property address of 35088 South Welty Road during File Review on August 23,2005. LA water sample was taken by Ms. Nancy Rosulek from the faucet of the house on August 23,2005 (Plate 1). I 4.4 Water Sample Constituents L The water sample was analyzed for nitrate and DBCP. DBCP was not detected in the water sample. Nitrate was found at 44.8 mg/L-NO3,which is slightly below the maximum contaminant level (MCL) set by the US EPA of 45 mg/L NO3.The analytical reports prepared by Precision Enviro-Tech can Lbe found in the appendix of this report. Well construction, seals, age and depth of the well screens may play a significant part in assessing the levels of Nitrate and DBCP in various aquifers.Without knowing specific details regarding well �. construction and condition,it would be difficult to accurately comment on the condition of the aquifer. Essentially, the water sample concentration approximately indicates the contaminant Lconcentration level of the aquifer from which the well is drawing water. It is Neil O.Anderson and 1 5 L '-.44 L