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E KMR Mr James L Barton April 12, 2005 Page 4 the RWQCB that provided an assessment of the events concerning the interruption of the SVE system operation and a detailed schedule of steps that will be taken to restart the SVE system ENSR recommended replacing the vapor abatement portion of the SVE system with activated carbon adsorption during the fourth quarter of 2004 The RWQCB approved of ENSR's request to modify the vapor abatement phase of the remediation system ENSR received the above referenced ATC from the SVAPCD on February 11, 2005 ENSR installed two 1,000 pound activated carbon vessels and plumbed them into the SVE system on February 14" and 15th A SJVAPCD inspector visited the site and approved the system to operate, under the conditions stated on the ATC on February 17th A report containing data summarizing the system parameters and sample data was submitted to the SJVAPCD on March 21, 2005 Sample data collected during the system restart event on February 17th suggests that soil vapor concentrations did not rebound during the unscheduled downtime since the thermal oxidizer failed ENSR will continue to monitor the SVE system on a weekly basis to minimize future downtime Since starting the SVE system in October 1999, the system has operated for a total of 7,344 hours and has removed approximately 8,736 pounds of petroleum hydrocarbons from impacted soil and groundwater Summaries of SVE system operational parameters, destruction efficiencies, and mass flow rates are presented in Tables 4 through 9 A copy of the ATC is included as Attachment F Air Sparging System Status The air sparging system was started to October of 1999 as required by CAO No 5-00-707 The AS system operated in a pulse mode--one week onlone week off—beginning in October of 2003 following a recommended by the RWQCB in a letter dated October 23, 2003 to pulse the AS system in each of the water bearing zones The AS system was returned to continuous operation to correspond with the restart of the SVE system on September 24, 2004 After the unscheduled shut down of the SVE system on November 30, 2004 the AS system was returned to pulsing on a weekly basis on December 6, 2004 with verbal approval from Mr Jim Barton of the RWQCB ENSR returned the AS system to continuous operation after the SVE system was inspected and approved on February 17, 2005 The AS system has operated for approximately 16,496 hours since to situ remediation at this site began to October 1999 • J 1ProleetW694015098 293MorkmglReports15098 1st QV 05-QMR doe Celebratrnp 35 Years of Excellence to Environmental Services