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3500 <br />3000 <br /> 2500 <br />0 <br /> <br />E <br /> <br /> 2000 <br /> <br />P <br />N U 1500 <br />o p <br /> <br />O <br />U <br /> 1000 <br />500 <br />0 <br />Legend <br />NPDES 020 - LAB <br />NPDES 021 - LAB <br />• <br />D <br />¦ <br />¦ <br />¦ <br />¦ <br />• <br />0 <br />03 Off ` O? 06 Ok O`b 400 O'l O9 03 Off ` Ob QP 61 O? <br />YEAR <br />FIGURE C-20. LAB CONDUCTIVITY VERSUS TIME FOR NPDES SITES 020 AND 021.