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. Accidental Discharge Report - Former Chevron #9-5775, Lodi, CA August 31, 2000 changed out on August 7, 2000 Given the calculated flow rates of less than 0 25 gallons per minute, not enough time had elapsed for breakthrough of all the carbon vessels GR mobilized to the site on August 18, 2000, collected a set of confirming samples from all four sample Points and then shut the GWS down It was discovered at this time that only 10 gallons had been discharged by the GWS following sampling on August 16 The system shut down due to a broken relay The system ns connected to an auto -dialing monitor, but this monitor is not configured to detect certain mechanical failures such as the broken relay GR repaired the relay, then delivered the confirmation samples to Kiff Analytical (Kiff) In addition, the samples collected on August 16 were picked up from Sequoia and delivered to Kiff to be re -analyzed and concentrations confirmed Analytical results were received from Kiff Analytical on August 22, 2000 Kiff's re -analysis (EPA Method 8260) of the samples collected on August 16, 2000, confirmed the presence of petroleum hydrocarbons in all four of the samples However, Kiff noted that the compounds quantified at TPHg were actually 2- butanone and tetrahydrofuran These compounds are known to be contained in the glue used in construction ofthe polyvinyl chloride (PVC) piping for the GWS Hydrocarbon concentrations in the confirming samples collected August 18, 2000 contained similar concentrations In addition, the Effluent, Midpoint 2 and Midpoint 1 samples were also reported to contain 2-butanone and tetrahydrofuran quantified as TPHg GR returned to the site on August 23, 2000, to flush and restart the GWS Approximately 1,500 gallons of tap water was flushed through the GWS and discharged to tank trailers for disposal at McKittrick • Confirming samples were collected following system flushing, and the GWS continued to operate with the effluent routed back into the surge tank pending receipt of analytical data Petroleum hydrocarbons were not detected in any of the confirming samples except for 2 8 ppb of benzene in the influent sample Effluent discharge to the industrial sewer began again on August 25, 2000 The presence of 2-butanone and tetrahydrofuran appears to be due to these compounds leaching from the pipe glue Flushing the GWS with tap water appears to have solved the problem The GWS continues to discharge to the industrial sewer The regularly scheduled weekly sampling will be conducted on August 31, 2000 Laboratory reports and chain -of -custody documentation for these sampling events will be included in the monthly report Please call us at 916 631 1300 if you have questions Sincerely, Gettler-Ryan Inc. Stephen J Carter, R Senior Geologist Attachments Figure 2 Extended Site Plan Figure 3 Groundwater System Process Flow Diagram Table I Treatment System Analytical Data • 346408 07 2