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S IEC0 R <br /> Ms Victoria L McCartney <br /> March 3, 2005 <br /> Page 7 <br /> Quarterly Results Summary <br /> Current Phase of Project Manitonn /Remediation <br /> Groundwater Monitoring Wells <br /> Sampled MW-1 R, MW-2R, MW-3 through MW-10, and VW-1 <br /> Sampling Frequency Sampled Quarterly <br /> Groundwater Monitoring <br /> Frequency _Quarterly _ <br /> Is Free Product (FP) Present <br /> Onsite No <br /> Current Remediation <br /> Techniques _Operation of Ozone Sparge System <br /> Volume of Groundwater <br /> Extracted this quarter None <br /> Total Volume of Groundwater 958,180 gallons (Groundwater batch extraction from <br /> Extracted August 2000 through June 2004) <br /> Approximate Depth to <br /> Groundwater 13 23 to 14 88 ft <br /> Shallow Groundwater <br /> Flow/Gradient Northeast at 0 001 ft/ft <br /> Planned Activities— First Quarter 2005 <br /> • Perform quarterly groundwater monitoring and sampling <br /> • Prepare and submit the quarterly groundwater monitoring report and remedial <br /> performance summary <br /> • Perform additional off-site assessment and submit a report documenting findings <br /> • Continue monthly operation and maintenance of the ozone sparge system <br /> REMEDIAL PERFORMANCE SUMMARY <br /> Ozone Injection Operation <br /> The OS system was brought on-line on May 25, 2004, and consists of a panel mounted <br /> KVA C-SpargeTm System that produces 4 grams per hour (0 009 pounds per hour) of <br /> ozone The OS system injects ozone into 10 OS wells (OZ-1 through OZ-10), and is <br /> programmed to supply ozone for seven minutes per well, 18 cycles per day During the <br /> current quarter, the system operated for 615 hours, resulting in 27% operation The system <br /> was found to be non-operational on October 26, November 30, and December 30, 2004, <br /> due to the ozone sensor being tripped, during each site visit, the ozone sensor was reset <br /> and the system was restarted The layout of the OS system is shown on Figure 1 Ozone <br /> injection system operational data is presented in Table 4 <br /> Ozone Infection Sampling <br /> �} Monthly groundwater samples were collected from wells VW-1, MW-2R, and MW-4 on <br /> October 26, 2004, November 30, 2004, and December 30, 2004 Samples were analyzed <br /> for gasoline range organics (GRO), BTEX, MtBE, and TBA by EPA Method 82606 <br /> 1 lconocoPhilhpslRetad Sites1111931QMR14QMR04 Final doc <br />