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i I alarms or shut-offs ASE also performed maintenance procedures as • necessary on all equipment I REMEDIATION SYSTEM S OPERATION ' OVERVIEW Puma and Treat Syste The P&T system was turned off during the end of year holiday season It ' was restarted on January 2, 2001— When the system was re-started, recovery wells RW-4 and RW-5 were removed from the pumping manifold and were replaced with the newly installed recovery wells RW-6 and RW-7 The system was found off, due to a high level switch on January 7, 2002 The system was manually turned off on January 14, 2002 to upgrade electrical wiring, and remained off through January 17, 2002 for the ' replacement of the activated carbon in two vessels The system operated continuously the remainder of the month 1Carbon Chanaeout A carbon changeout was completed on GAC vessels #1 and 2 on January �. 17, 2002 H)jdrocarhon Breakthroue ' Based on analytical results of the water sample collected from GAC #1 on November 2, 2001, ASE became aware that hydrocarbons had broken through the first carbon vessel Based on analytical results of the water ' sample collected from GAC #2 on January 3, 2002, ASE became aware that TBA had broken through the second carbon vessel No compounds were identified in the sample collected from GAC#3 the following week At no time during the month of January 2002 were any petroleum hydrocarbons discharged to the Manteca Sanitary Sewer Line See the analytical reports attached in Appendix A 1 Flow Rare During the month of January 2002, the system recovered and treated 175,140 gallons of groundwater While operating, the system extracted, ' on average, approximately 4 gallons of contaminated groundwater p e r minute 1 Frank's One Stop Remediation System's Monthly Report -- January 2002 -2-