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C-SHADRIFS91.6/G WPP.S <br /> 01/22/92 <br /> and analyzed, with some individual samples analyzed for more than 100 <br /> chemical species. In addition, potentiometric (water-level) data have been <br /> collected monthly from approximately 150 wells since 1986. <br /> During the investigations, the list of study objectives was modified to include <br /> several items required for SHARPE to respond to regulatory agency requests from <br /> CVRWQCB, DTSC, and EPA Region IX. As a result of the early investigations, an <br /> interim groundwater extraction and treatment system, which has been in <br /> continuous operation since March 1987, was installed in the South Balloon Area. <br /> Results from the RI established the need for a similar groundwater treatment <br /> system in the North Balloon Area; it has been in operation since October 1990. <br /> A Central Area Treatment System will be put in operation after the Record of <br /> Decision (ROD) is signed and the remedial design complete. The ROD will also <br /> include requirements for the operation and, if necessary, upgrading of the North <br /> and South Balloon and Central Area treatment systems to ensure that treatment <br /> goals are met. <br /> SCOPE OF RESPONSE ACTION <br /> Because of the many studies at SHARPE addressing groundwater contamination, <br /> remediation plans for this medium are further along than for the soil <br /> contamination. Consumption of groundwater is the greatest human health risk; <br /> therefore, SHARPE determined that groundwater cleanup should proceed as <br /> quickly as possible, with soil cleanup to follow as soon as feasible. Exposure to <br /> soil contaminants represents a much reduced health risk compared to exposure to <br /> site groundwater. <br /> 6 <br />