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' f <br /> Ms Rebecca Setliff <br /> ' Page 4 of 4 <br /> VAPOR EXTRACTION SYSTEM ACTIVITIES <br /> ' <br /> Vapor Extraction System Operation <br /> On March 7, 2002, the San Joaquin Valley Air Pollution Control District (APCD) inspected the vapor <br /> t S extractions stem During the inspection vapor samples were collected from the influent and <br /> Y (VES) <br /> effluent to determine the destruction efficiency Analysis consisted of TPHg, BTEX and MTBE using <br /> ' EPA method TO-3 The system was subsequently shut down pending analytical results <br /> On March 18, 2002, the VES was restarted Analytical results of the vapor samples collected March 7, <br /> ' 2002, indicated a destruction efficiency of greater than 99 % On March 23, 2002, the system went down <br /> The cause is unknown, however, a power outage induced from the recent rainstorms is suspected The <br /> VES was restarted on March 25, 2002 <br /> ' The system will be pulsed several more times during the next quarter, and influent and effluent vapor <br /> Y p g <br /> samples will be collected Analytical results will then be evaluated to determine if additional operation of <br /> ' the system would have any appreciable benefit <br /> ' RECOMMENDATIONS <br /> jib <br /> Quarterly Groundwater Monitoring and Sampling <br /> I <br /> Fieldwork for the second quarter will be conducted in May 2002 EHD will be notified 48 hours prior to <br /> tconducting the quarterly fieldwork <br /> If you have any questions or comments regarding this quarterly monitoring and sampling report, please <br /> ' call at your convenience <br /> Respectfully, <br /> ' Gro Zer ,Inc <br /> Sean ey, <br /> ' Staff ologist � G� <br /> �a <br /> GREGQRY P. <br /> ' STAN <br /> Gregory P Stahl, RG 5023 No. 5023 �F <br /> CA Certified Hydrogeologist No 264 <br /> ' Attachments F OF CALF <br /> PC Mr Carl Knowles <br /> ' Mr Pat Riddle, Esq, Law Offices of Patrick D Riddle <br /> Mr Marty Hartzell, RWQCB Sacramento <br /> ' Mr Don Roek <br /> ' ioeklgmr11gm20022 <br />