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! <br /> Graph 4 - Concentrations of Hydrocarbons in NP-2-22 during <br /> C-Sparge System Operation <br /> 1,800 70 <br /> 1,600 <br /> 60 <br /> 1,400 <br /> sa <br /> 1,200 - <br /> 0 ,000 4a a <br /> CL <br /> Began <br /> l <br /> CD Pilot <br /> 800 30 c <br /> m <br /> 600 <br /> Additlonal Sparge Points Installed 20 <br /> 400 <br /> aselV\ I I t 10 <br /> 200 <br /> a o <br /> Oh`��\0�'1�`0�`pr�`p'��,p►.\�'p��\p,�3�`p'��\p�L�`,���\�\'��\h\�\h\rL�O��\,�\'��\�\`��p�L�\h\L�`�\'��`O\`��Oti�\O^�1��O��L�\�rL�`R�1���rL,�\,�\r1�O�ti�`O��\���`OD` <br /> Sampling date <br /> -f-TPHg (n ppb) -*-benzene (in ppb) <br />