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! ' KLEINFELDER The AS/SVE system consists of a network of two air sparging wells (shallow/deep) and a vapor extraction well positioned at five distinct locations, totaling fifteen wells. The ozone infection system consists of a horizontally directional drilled (HDD) conduit for ozone/air transmitted to a system of wells triple-nested at three different depths below groundwater, at five separate locations, equaling fifteen wells. Active remediation began in May 2003 in the source area (actual Disco site) by means of AS/SVE utilizing a thermal/catalytic oxidizer unit. Continual operation of the thermal oxidizer began in June 2003. In July 2003, the AS/SVE unit was converted from a thermal oxidizer to catalytic oxidizer thereby optimizing the efficiency through fuel uptake. The ozone injection system began consistent operation within the downgradient portion of the plume in September 2003. The system has only been inoperable during periods of system maintenance and enhancements. During this quarter, the groundwater remediation system has undergone extensive upgrades. Flourinated Ethylene Propylene (FEP) tubing was installed within the HDD conduit and replaced the former tubing due to slight failures. The FEP tubing is even more conducive to ozone applications. A venturi injector system was also designed and installed to help reduce ozone pump pressures needed to inject the ozone in the air stream. During the fourth quarter the vapor extraction operation was shut off at wells (VE-2 —VE-5) due to the high concentrations found at VE-1 (centrally located over the former UST locations). Photo-ionization detector (PID) samples were collected from VE-1 each month during the Fourth Quarter 2004 and ranged in concentrations of 950 to 1500 ppm (before PID termination). Air inlet sampling revealed TPH-g was detected at a concentration of 310 ppmv and 730 ppmv respectively. The destruction efficiency of the thermo/catalytic oxidizer was calculated at 98%. The results of groundwater monitoring have been submitted to the "Geo Tracker" system, as required by the RWQCB and EHD. GENERAL RECOMMENDATIONS Kleinfelder recommends that a copy of this report be submitted to Mr. Mike Tnfurna of the San Joaquin County Public Health Services Department Environmental Health Division (EHD) and Mr. Jim Barton of the Central Valley Office of the State of California Regional Water Quality Control Board(CVRWQCB)by Del Monte Foods for their review and consideration. This report is subject to the limitations found in Chapter 7 of.this report. l : 12280.M0N/ST05R173/]Z:1v Page 2 of I I C 2005,Kleinfelder, Inc. February 11,2005