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I - 0 INTRODUCTION ' This submittal presents Aqua Science Engineers, Inc (ASE)'s first six month's operation report of a "pilot-study" ozone-sparging remediation system at the Unocal Service Station located at 574 West Grant Line Road in Tracy, California (Figures 1 and 2) This report has been prepared on behalf of Mr Satnam Singh, owner of the property, as required by the San ' Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) ' 2 . 0 SYSTEM OPERATION On August 12, 2002, the C-Sparger ozone-sparging remediation system was programmed and tested by ASE and McCulloch Environmental personnel McCulloch is the local distributor and service group for the ' remediation equipment On August 13, 2002, the system was officially turned on Just prior to system start-up, ASE measured the dissolved oxygen (DO) content in the six on-site groundwater monitoring wells, see ' Table One The system has been designed to operate continuously 24-hours a day, 7 ' • days a week The C-Sparger system has operated approximately 90 - 95% of the 180 +/- days since the system was turned on The system has ' experienced some brief periods of down time due to the following During the second week of operation, the system went down due to a ' malfunctioned power switch The system had been off for several days prior to ASE's discovery of the failed switch The wiring problem was repaired by ASE personnel, and the system was turned on again • During the second week of September 2002, ASE personnel noted that the air pressures began fluctuating, especially when tapping on the ' individual solenoids for each well What this indicated was that the electronic valves (solenoids) that were programmed to open and close ' at specified times, were likely not closing completely This would mean that the ozone/air mixture was being shared by multiple wells, rather that the one well at a time, as programmed ASE allowed the system to ' continue to operate since the problem only appeared sporadically During the week of September 9, 2002, each of the solenoids was replaced and an in-line air filter was installed to purify the air before it ' reached the solenoids The manufacturer of the C-Sparger suspected that the "sticking" solenoids was the result of dust in the air ' Sin h's Unocal System First six Month's Operation Report — February g y p p 2003 -1-