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5 <br /> 1 S E C V <br /> gradient of 0 004 ftfft The groundwater flow direction and hydraulic gradient reported for the shallow and <br />- deeper water-bearing zones during the first quarter 2005 are also consistent with historical data <br /> Groundwater extraction (GWE) and soil vapor extraction (SVE) continues at the site Eight weekly batch <br /> ' extraction events were conducted between January 5 and February 23, 2005 The weekly batch extraction <br /> events were discontinued after February 23, 2005 due to the installation of offsite ozone sparge wells and ,P <br /> Pending offsite remedial system installation Rernediation at the site will be expanded to include the <br /> ' installation of an offsite ozone sparging (OS) system on the adjacent Taco Bell property SECOR installed <br /> the offsite OS wells in March 2005 and offsite remedial system installation activities began April 27, 2005 <br /> A remedial performance summary of site remediation activities is included in Attachment A SECOR's <br /> ' procedures for groundwater sampling and equipment decontamination are included in Attachment B The <br /> certified laboratory analytical reports, chain-of-custody documentation, and field data sheets are included as <br /> Attachment C <br /> r <br /> ' Groundwater monitoring and sampling was coordinated with activities performed at former 76 Service <br /> Station No 4409, located northeast of the site Attachment D contains a report prepared for this site by <br /> TRC Solutions (TRC), which includes groundwater elevations and analytical data collected during the first <br /> 1 quarter 2005 Joint monitoring and sampling event k <br /> ' This report presents our understanding of existing conditions at the subject site The conclusions <br /> contained herein are based on the analytical results, and professional judgment in accordance with <br /> current standards of professional practice, no other warranty is expressed or Implied SECOR assumes <br /> no responsibility for exploratory borings or data reported by other consultants or contractors <br /> 1 <br /> s <br /> 1 <br /> r,�fik <br /> I IBP-ARC0144321QMRs1200511 QMR05 dor, <br /> R <br /> 4 � <br /> k <br /> L{d <br />