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Mixing models were developed to evaluate contributions from septic and naturally-occurring nitrate in the saturated and unsaturated zone; the models also incorporate the effect of denitrification on nitrate concentrations and ��15N-NO3 compositions (Fig. 11). The first or upper mixing curve represents simple mixing of septic water having a nitrate concentration of 50 mg/L as N and a ��15N-NO3 valu

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