ARCHIVED REPORTS XR0003483 - Laserfiche WebLink

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C A M B R I A tank was removed and a vacuum truck was employed to extract groundwater directly from RW-lA on a bi-weekly basis Vacuum truck events were discontinued after the July 17, 2001 event On June 20, 2001, a permanent GWE and treatment system began removing groundwater, treating it, and discharging it directly into the sanitary sewer system GWE system analytical data and GWE system mass removal data are presented in Table 1 and Table 2, respectively Methyl tertiary butyl ether (MTBE) concentrations and mass removal from well RW-IA are depicted in Figure 3 Volume and mass removal data for vacuum truck operations and the permanent GWE system,through May 16, 2005, are summarized in the table below Mass TPHg Mass MTBE Volume Removed (pounds) Removed(pounds) Groundwater Removed (gallons) Vacuum Truck 397 671 622,649 Operations Permanent GWE 767 882 2,550,596 System Total (GWE) 1,164 1,553 3,173,245 During the second quarter of 2005, Cambria operated the GWE system in compliance with the City of Stockton Groundwater Discharge Permit The GWE system was shut down between February 28, 2005 and March 30, 2005 for LEL meter sensor repair and carbon replacement activities The GWE system was again shut down from April 29, 2005 through May 11, 2005 carbon replacement activities ANTICIPATED THIRD QUARTER 2005 ACTIVITIES Blaine will gauge and sample the site wells according to the established sampling schedule and tabulate the data Cambria will prepare a groundwater monitoring report Cambria will continue to operate the GWE system CONCLUSIONS AND RECOMMENDATIONS The petroleum hydrocarbon and MTBE concentrations in groundwater samples collected from the shallow wells this quarter are within the historical norm for this site Groundwater data • indicates that RW-lA continues to contain the highest levels of hydrocarbons and MTBE 0783 2