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THIRD QUARTER 2008 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.1`15-2003-0080 inoperable during a site visit on August 4,2008,but no cause was found for the shutdown. The plant shutdown date was calculated from operating hours assuming that the plant had not been operating intermittently.The shutdown date was determined to be July 26,2008. The GTF was restarted on August 4,2008,and operated normally. The GTF was shut down on August 11,2008,and the air stripper packing material and sump were acid washed between August 11 and 13,2008.This routine maintenance procedure removes mineral deposits,thereby improving the efficiency of the treatment system.The packing and sump were inspected on August 13,2008,and found to be free of mineral deposits. The effluent from the acid wash was neutralized,buffered,and stored in a holding tank onsite.The pH of the acid wash effluent was measured on August 14,2008, and found to meet the requirements of the City of Stockton Regional Wastewater Control iFacility.The neutralized,buffered acid wash effluent was disposed of at the City of Stockton Regional Wastewater Control Facility on August 18,2008. The GTF was restarted on August 13,2008.Approximately 18 minutes after the restart,the water level in the air stripper sump triggered the high-level alarm switch and the GTF shut down.The GTF effluent piping was inspected and mineral deposits in the piping were determined to be sufficiently thick to impede flow and cause a backup in the sump. The effluent piping was replaced and tested for leaks between August 18 and 29,2008.During the testing period,the GTF was started and shut down several times after small leaks were observed from the effluent piping.None of the leaking water entered the stormwater ditch alongside the GTF access road or entered Littlejohn Creek.The effluent piping repair was completed and the GTF was restarted on August 29,2008. An electrician visited the GTF on August 25,2008,to test the air stripper sump level sensors and control loop.The level sensors were cleaned and tested and a sump latch control modification was made to prevent the GTF from automatically restarting after a high sump level alarm shutdown.The GTF shutdown on July 26,2008,is believed to have been caused by a high sump level condition.The sump latch control modification now requires a technician to manually clear the high sump level alarm condition before restarting the GTF. The GTF operated at 87.1 percent uptime during third quarter 2008,excluding downtime for the annual acid wash and effluent pipe replacement. 3.0 Influent and Effluent Monitoring Under WDR Order No. R5-2003-0080,effluent samples are analyzed as follows: • Monthly for pH,specific conductivity, and VOCs • Quarterly for total dissolved solids • Annually for dissolved inorganics All parameters other than dissolved inorganics were analyzed during third quarter 2008. Figure 1 (at the end of this report) shows the effluent monitoring location.Table 2 presents the results of the effluent monitoring performed during third quarter 2008.Appendix A contains the effluent monitoring field sampling logs and laboratory results for third quarter 2008. RDD082970002(CAH4207.DOC) 2