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standards in about 10 pet-Cent of wells- nationwa.de . In 1992 , EPA <br /> provided a list of large water systems with lead levels exceeding <br /> 0. 015 mg/1 ( Table 3) . <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The presence of lead in the groundwater is a health concern , -Lf the <br /> ' groundwater is a drinking water souce . The health effects depend <br /> upon the nutrition , health status , and actual exposure conditions <br /> of the target population . Younq children ( 0-6 years ) , pregnant'. <br /> women , and person: with renal or' hepatic disorders are more <br /> susceptible to the adverse health effects of lead . The research to <br /> date indicates that the threshold for adverse health effects is not <br /> quantifiable , that, the lowest achievable levels of lead exposures <br /> should be the objective . <br /> Since the concentrations of lead in the groundwater appear to be <br /> generally declining , remediation of soils seems inappropriate . <br /> However , the lead concentrations in the surrounding drinking water <br /> supply wells should be monitored quarterly. If drinking water <br /> samples consistently exceed the 0 .015 mg/1 MCL standard , <br /> alternative water supplies should be considered . <br /> REFERENCES <br /> ATSDR , 1991 , Toxicological Profile for Lead. U . S _ Department of <br /> Health and Human Services , Public Health Service _ Aqency for Toxic <br /> Substance and Disease. Registry , October , 1991 , <br /> Integrated Risk Information System ( IRIS ) , January , 1993. <br /> 1 <br /> i <br /> 1 <br /> 1 <br /> 1 <br />