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System Operation Summary$od Vapor <br /> Extraction and Emission Control System <br /> 620 West Charter Way Stockton California <br /> i <br /> It is our recommendation that system operation/pulsing be continued until the BTEX and <br /> TPH concentrations/mass extraction rates reach asymptotic conditions Asymptotic levels <br /> indicate the system has reached the technical and economic limits of effectiveness <br /> When asymptotic levels are reached, ground water quality will be assessed and <br /> regulatory site closure plans/negotiations pursued <br /> Sincerely, <br /> AEGIS ENVIRONMENTAL, INC <br /> Sudhakar Talanki <br /> Project Engineer <br /> ST/sdh <br />. Enclosures <br /> cc Dan Kirk, Shell Oil Company <br /> Elizabeth Thayer, Central Valley Regional Water Quality Control Board <br /> Rick Schroder, Shell Oil Company <br /> 91 2461 LTR 4 <br />