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S f T r Ozone Microsparge Well and System Installation Report—Former Tosco(Unocal)Service Station No 6981 February 1,2002 I s• Thirteen ozone sparge points were installed at locations shown on Figure 2 The bonngs were drilled to depths of approximately 65 feet bgs (SP-1 through SP-10) and 40 feet bgs (SP-11 through SP-13) °A sparge point was installed at the bottom of each boring Sparge point construction details are presented on the boring logs in Appendix B 'The ozone panel was mounted on a unistrut frame The panel includes an ozone generator, air compressor,and a programmable timer/controller `Sparge points are connected to the panel by 318" LDPE tubing Each sparge point has a dedicated line The tubing was run through schedule 80 PVC conveyance piping for added protection Construction activities were performed by Glennco of Newcastle, California The process flow diagram_is included as Figure 3 Ozone Microsparge Siem Startup The system was placed into operation on December 19, 2001 The'system cycles ozone/air injection between ten sparge points (SP-J through SP-10) Since the ozone microsparge panel can only supply ten points, wells SP-11 through SP-13 will be for future use The schedule is currently set to cycle through each point 16 times per day, for 5 to 10 minutes per point per cycle Sparge point selection and cycle times will be adjusted as petroleum hydrocarbon concentrations in groundwater change A system status report will be issued after the first six months of operation, presenting the results of the sampling program At that time,the effectiveness of the system will be evaluated • SUMMARY - Thirteen ozone microsparge wells (SP-1 through SP-13) were installed on-site as an enhancement to the existing remediation system in November 2001 Drill cuttings generated during drilling activities were sampled, then transported to Forward Landfill for disposal The ozone microsparge system was placed into operation on December 19, 2001 The vapor extraction system modifications will be installed and the system operation initiated upon receipt of the specified new equipment DISTRIBUTION GR recommends that a copy of this report be forwarded to Ms Margaret Lagorio of SJCPHS-EHD at 304 East Weber Avenue, Third Floor, Stockton, California 95202 and Mr David Luick of Dayton Hudson Corporation-Target at P O Box 9411, Minneapolis,Minnesota 55440 f REFERENCES Gettler-Ryan Inc, 2001, Groundwater Monitoring and Sampling Report Third Quarter Event, Report No 180138,dated October 24, 2001 14012412 ' S