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Table 1 - Historical Summary of VES Field Monitoring Data Unocal Service Station No 6981 4707 Pacific Avenue Stockton,California I Hour Wellhead Influent Monitoring Data Effluent Monitoring Data Date Meter Pipe Dia Area dP Vacuum Temp Velocity Pipe Dia Area dP Temp Velocity Reading (m) (in`) (in H2O) (in H2O) (°F) (fpm) (in) (in') (in H2O) (°F) (fpm) 09-20-00 18307 2 002 40 27 90 8,453 10 0 545 004 780 1,226 09-28-00 18360 2 002 46 30 77 8,992 10 0 545 008 510 1,534 10-25-00 18360 2 002 26 20 65 6,598 10 0 545 003 780 1,062 10-30-00 18480 2 002 40 30 62 8,268 10 0 545 003 785 1,064 11-28-003 05 2 002 30 22 52 7,017 10 0 545 005 802 1,383 12-01-00 70 2 002 30 27 50 7,049 10 0 545 003 810 1,075 12-15-00 72 2 002 36 30 61 7,836 10 0 545 007 780 1,622 12-21-00 217 2 002 40 30 54 8,204 10 0 545 003 790 1,066 01-23-01 218 2 002 24 5 55 6,160 10 0 545 003 800 1,071 01-31-01 325 System down due to mechanical failure 06-21-01 325 2 002 23 30 88 6,423 10 0 545 002 810 760 07-02-01 329 2 002 25 30 75 6,617 10 0 545 002 810 809 07-26-01 329 2 002 22 25 82 6,207 10 0 545 002 920 915 07-31-01 445 2 002 26 35 65 6,729 10 0 545 002 825 883 08-23-01 446 2 002 23 30 84 6,400 10 0 545 002 775 749 09-18-01 475 2 002 33 30 75 7,602 10 0 545 004 807 1,240 Explanation °F=degree Fahrenheit in H2O=inches of water column dia =diameter fpm=feet per minute dP=differential pressure Temp =temperature in =inches in 2=square inches i System shut down on 10/26/97 due to the failure of the flame detector The flame detector was replaced on 1215197,and the system operated approximatley 3 hours Influent and effluent samples were collected to confirm detector operation and destruction effeciency,then the system was shut down pending reciept of analytical data Dilution valve control motor replaced and system restarted on 12/21/97 2 Service station facilities were removed Power to VES originally came off the main breaker panel for the service station Station demolition required a new service drop from power company,which was not completed until August 2000 3 New hour meter installed I � Stockton,00 981 052404 r