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Figure 4: <br /> Graph showing concentrations of carbon tetrachloride <br /> at the All Pure Chemical,Tracy Facility(4/91 - 8/94) 97 ugA <br /> 100 (Data from APC Quarterly Monitoring Reports, RESNA) <br /> 90 ' <br /> 80 <br /> W <br /> a 70 j <br /> O K• <br /> L <br /> V 4 <br /> c 60 f ■MW-1 <br /> a° _ ■MW-2 <br /> c 50 ■MW-3 <br /> 0 0 O MWS <br /> c o- <br /> o ` 40 t <br /> M <br /> c <br /> Q <br /> v , <br /> 0 30 <br /> 20 <br /> 10 ? MCL=0.5 <br /> 0 LI <br /> Jul. 91 Jan. 92 Jul. 92 Mar. 93 Aug. 93 Mar. 94 Aug. 94 <br /> Sampling period <br /> Tracy Well Survey <br />