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March 2005 Monthly Treated Water Self Monttonng Report—1707C Canepa's Car Wash,Stockton,CA Pagc 3 . SUMMARY On February 14, 2005, Calgon Carbon Corporation(Calgon)removed spent carbon in the primary carbon treatment vessel for the groundwater treatment system and re-bedded it with activated carbon Condor their re-plumbed the system to switch the vessels so that the re-bedded vessel would become the secondary (final) unit Following that work, Condor re-started the system and collected the final discharge sample on February 16, 2005, as described in a letter dated March 8, 2005 Once the laboratory results of the sampling were received on February 28, 2005, Condor re-sampled the final discharge on March 1, 2005 (sample specified as Final Discharge) from the system and also collected a sample from between the two carbon vessels (specified as Mid-Tank) collected after the primary vessel and before the secondary vessel) and submitted both samples to Argon for rush analyses Immediately after the sample collection activities, Condor shut-down the system (at approximately 16 00 on March 1, 2005) The rush laboratory analytical results of the Mid-Tank sample collected on March 1, 2005 indicated that tertiary-Butanol (TBA) was present at 120 µg/L but all other constituents, including MTBE, were not detected at or above the laboratory reporting limits (0 5 pg/L for MTBE) The rush analytical results of the Final Discharge sample collected on March 1, 2005, however, indicated that MTBE and benzene were detected at 93 and 0 6 µg/L, respectively No other constituents, including TBA, were detected in the Final Discharge sample at or above the laboratory reported detection limits (5 0 gg/L for TBA) The results of the re-sampling, as described, seemed to indicate that MTBE was being introduced into the system effluent by the newly recharged final carbon vessel Condor described the above described activities and results in a letter dated March 8, 2005, submitted within five working days from the date that the problem was discovered (as required by the discharge permit) As also described in the March 8, 2005 letter, our plan of action was to have Calgon recharge both carbon vessels as soon as possible Following that, Condor would temporarily restart the system (without any discharge to the sanitary sewer), collect the appropriate samples from the system and then turn off the system pending the results of the laboratory analyses The carbon vessels were recharged by Calgon on March 30, 2005 The system was turned on and charged with groundwater until a final discharge sample could be collected on April 4, 2005 The laboratory analytical results of that sampling event were faxed to the Municipal Utilities Department on April 3, 2005 The results of those analyses detected no constituents of concern, were sufficient to resume discharge and will be included in the April report FUTURE WORK As required by the discharge permit, Condor will submit an additional letter providing a detailed explanation and description of the discharge incident and the plan to correct the problem within 30 days of the Notice of Violation Condor will continue monthly self-monitoring of the system through cessation of the groundwater treatment project or as deemed necessary by the Client or MUD LIMITATIONS AND SIGNATURE This report was prepared under the direct supervision of a Professional Engineer in the State of California The standard of care for all services performed or furnished by Condor is consistent with standard practices by a member of the environmental profession practicing under similar conditions at the same time and locality when and where the work is performed Condor is not responsible for the accuracy and completeness of information collected and developed by others This report was prepared for the sole use of Mr Remo Canepa, and may not be used or relied upon by any other persons) without the_express_wmtt_en consent and authorization-of Mr_Canepa and-Condor If_any__ changes are made or errors found in the information used for this report, the interpretations and . conclusions contained herein shall not be considered valid unless the changes or errors are reviewed by Condor and either appropriately modified or re-approved in writing Any questions regarding the content of this document should be addressed to Jeff Willett at(204)234-0518