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S E C 0 R <br /> 76 Station No. 11193 <br /> August 13, 2004 <br /> Page 7 <br /> Soil and Rinsate Water Disposal <br /> Soil cuttings generated during drilling operations were temporarily stored on-site and <br /> covered with plastic sheeting pending characterization and disposal (4 cubic yards total). <br /> Water generated during the steam cleaning of drilling equipment during the installation of <br /> the wells was temporarily stored on-site in California State Department of Transportation <br /> (DOT)-approved 55-gallon drums (7 drums total) also pending characterization for <br /> disposal. Soil cuttings and rinsatelpurge water drums were transported by Filter Recycling <br /> to an appropriate, licensed disposal facility. <br /> Remediation System Installation <br /> Remediation system installation was completed on May 7, 2004 by MARCOR <br /> Environmental. System components installed by MARCOR included a remediation <br /> compound, a KVA C-spargeT"" panel, a ten-point injection manifold, and buried 318-inch <br /> diameter, high density polyethylene (HPDE) system lines contained in 2 to 6-inch diameter <br /> PVC conduit. Each point on the injection manifold is equipped with an electrical solenoid, <br /> which controls the flow of ozone/air mixture to the ozone sparge wells. The solenoids are <br /> controlled by a timer, which is programmed to sequentially inject into each well for 7 <br /> minutes (70 minutes total for each cycle), 18 times a day (18 cycles per day). The sparge <br /> panel is equipped to with a compressor rated to deliver 6 standard cubic feet per minute at <br /> 10 pounds per square inch. <br /> Remediation System Troubleshooting and Startup <br /> Upon completion of the OS system installation, the OS system was brought on-line by <br /> SECOR technicians to verify the correct operation of process equipment and controls, and <br /> to troubleshoot and repair any component of the system not operating correctly. Once the <br /> system was fully operable, official startup was performed on May 25, 2004. <br /> Remediation System Operation and Reporting <br /> As part of the monthly system operation and maintenance, SECOR checks and maintains <br /> equipment, and monitors the OS system for fugitive ozone emissions in lateral piping <br /> trenches and well boxes. The OS system will be operated until remediation goals are <br /> achieved, or until the remediation effort is shown to no longer be technically or <br /> economically feasible. <br /> Reports documenting the performance of the OS system are submitted quarterly. They <br /> include a summary of remediation system performance, and an evaluation of dissolved <br /> petroleum hydrocarbon concentrations detected in site groundwater monitoring wells to <br /> determine whether OS is an effective technique for reducing petroleum hydrocarbon <br /> concentrations in soil and groundwater beneath the site. <br /> Site groundwater monitoring and sampling will continue on a quarterly basis using the <br /> existing well network. SECOR will incorporate the data collected into a groundwater <br /> monitoring and system efficiency report that will be submitted on a quarterly basis. The <br /> quarterly reports will include a summary of system operation, monitoring and sampling <br /> results, field notes, copies of the analytical lab results, and tables summarizing the field <br /> and analytical data. <br /> I:IConocoPhillips\Tosco Marketing1111931Reports\ozone Well install Rpt 6-04 recovered.doc <br />