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100 <br />90 <br />80 <br />70 <br />d <br />v <br />o. 60 <br />w <br />d 50 <br />O <br />U) 40 <br />O <br />V <br />30 <br />20 <br />10 <br />0 <br />Basin Resources <br />Monitoring Point B27 (destroyed in 2000) <br />rn rn <br />rn rn <br />rn ti <br />v <br />N `- <br />M <br />Date of Sample <br />¦ Methane ? Oxygen ® carbon Dioxide