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Nitrate-Nitrogen <br /> 25 <br /> 20 <br /> ■ MW-1 <br /> �. <br /> 15 MW-2 <br /> —• MW-3 <br /> E —�— MW-4 <br /> 10 <br /> MW-5 <br /> —�— SB-1 <br /> 5 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />