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Mr Kenneth Earnest Ultramar Inc April 27, 1995 -- Page 2 During the time period from December 28, 1994 through March 22, 1995, the SVE system had operated for approximately 902 hours (—38 days)out of 2,016 hours (--84 days). The system down time was caused by abnormal high water vapor content in the soil vapor stream due to the local heavy rainfall received in January through March 1995 Table 1 presents the cumulative hours of system operation through March 22, 1995 Normal system operation and maintenance site visits were performed by Western States Instrumentation on January 18, February 7, and March 22, 1995 Table 1 presents the collected monitoring data for these events On February 7, 1995, field instrument data indicated that the system's hydrocarbon destruction efficiency had fallen to 90 percent It is believed that this reduction in destruction efficiency was only a temporary event due to the uncontrollable high levels of water vapor present in the soil vapor stream In an effort to improve the system's destruction efficiency, the system was adjusted and allowed to continue to operate to attempt to dry out the moisture laden soil vapor stream Based on data presented by Ultramar, the system's temperature chart recorder indicated that the system had shut down the next day (February 8, 1995) due to high water in the 55 gallon knockout drum. The water was pumped into a container from the knockout drum and the system was subsequently restarted on February 9, 1995. On February 15, 1995, the temperature chart recorder indicated that the system had shut down again on approximately February 10, 1995, due to high water in the water knockout tank The water was pumped out of the tank and the system was subsequently restarted on February 15, 1995 The system was closely monitored and system adjustments were made during the following 48 hours (February 16 and 17, 1995) The system was eventually turned off on February 17, 1995, due to poor destruction efficiency On February 29, 1995, the system's catalyst was removed for inspection and repair On March 22, 1995, the repaired catalyst was reinstalled and the system was temporarily started and operated for approximately two hours The system was again turned off due to persisting high moisture levels in the soil vapor stream. It will remain off until dryer system conditions transpire or until a more efficient water knockout tank can be evaluated and installed Remarks/Signatures The information contained in this report represent our professional opinions, and are based in part, on information supplied by the client These opinions are based on currently available information and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this tune and location Other than this, no warranty is implied or intended