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L v �/ <br /> LJuly 30,2005 <br /> NCA Project Number: E05089A <br /> Page 5 <br /> 4.2 Potential Ground Water Contamination Issues <br /> LPotential ground-water contamination can occur from a number of sources which often include <br /> leaky underground storage tanks,agricultural activities, dairies, septic systems,and storm water <br /> L infiltration. Agricultural activities and the use of septic systems in the area should be considered <br /> potential ground-water contamination sources. <br /> L EHD staff has indicated that the shallow aquifer within the central Tracy area xperience ' e <br /> contamination.The contamination most likely ongtttates from agricultural activities, dames and <br /> septic systems. <br /> L4.3 Well Permit History and Water Sample Location <br /> According to personal communication on July 19, 2005 with subject property owner, Dolores Lim, <br /> L <br /> one domestic well exists on the property. One domestic well was observed by staff at Neil O. <br /> Anderson&Associates,Inc. on June 24, 2005. <br /> LNo permits were found for the address of the subject property during a file review on June 24,2005. <br /> A water sample was collected from a faucet adjacent to the domestic well by Mr. Conor McGee of <br /> our office on June 24, 2005. <br /> 6. 4.4 Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. The analytical reports prepared by Precision <br /> Enviro-Tech can be found in the appendix of this report. <br /> L Nitrate was detected in the water sample at a level 6f_76.5 mg/L-N This level exceeds the <br /> maximum contaminant level (MCL) set by the US E e which is 45 mg/L NO3. This <br /> water test is consistent with reports_from EHD taff aquifer in this area e�cperiences nirtate <br /> contamination. <br /> L <br /> The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County <br /> L and other parts of the Central Valley. Nitrate in ground water occurs as a result of the application <br /> of fertilizers,livestock waste,and untreated septic tank waste. Nitrate is mobile and often <br /> accumulates in the shallow ground water zones. <br /> L <br /> L <br /> L <br /> 5 <br /> L '-'44 <br /> 1 <br />