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r� ■rrr rr r r w r r r� ■� MIM r r <br /> PZ-1 Benzene Concentrations <br /> 5500 - <br /> 5250 - <br /> 5000 - <br /> 4750 - <br /> 4500 - <br /> 4250 - <br /> 4000 - <br /> 3750 <br /> 50052505000475Q450Q425a40003750 <br /> ' 3500 <br /> 3250 <br /> 0 3000 <br /> 2750 +Concentration Trends <br /> c 2500 - <br /> 4) <br /> c 2250 - <br /> 0 2000 Sparging Initiated <br /> i <br /> 1750 4/25/2001 <br /> 1500 -- <br /> 1250 New Sparge Well SP-A <br /> 1000 Installed 3/14/2002 <br /> 750 -- <br /> 500 - Sparging Disengaged <br /> 250 1212002 <br /> 0 <br /> rn rn O o 0 r r r N N N N CO � It <br /> rn rn 0 0 0 0 0 O O O O O O O O O <br /> O1 d9 O O O O O O O O O O O O O 0 <br /> N N N N N N N N N N N <br /> 0 rn _rn It er CL) C� <br /> N C10 r N O <br /> q r CO r <br /> r r <br /> Date <br /> Histonc Benzene Results XLS/PZ-1 Chart <br />