Abstract
Thirty-four swine waste lagoon systems in North Carolina were examined for evidence of seepage losses to theshallow groundwater. All were constructed prior to the states January 1993 adoption of stricter construction standards. Mineralnitrogen concentrations (ammoniacal plus nitrate nitrogen) were used as the primary indicators of seepage impacts. Totalmineral concentrations were compared to the U.S. EPA drinking water standard for nitrate-N of 10 mg/L. The shallow groundwateron approximately one-third of the 34 systems met the EPA standard at a distance of 38 m (125 ft) downgradient fromthe lagoon(s).
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