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TrOadweIBAdlo The soil remediation work conducted at Area 15 was described in Section 5.2.3. The soil and groundwater remediation work conducted at Area 16 consisted of excavating contaminated soil from below the former UST location in a shored_excavation that extended several feet below the groundwater table. An oxygen release compound was placed below the water table prior to backfilling to enhance natural biodegradation, and the impacted soil and groundwater were disposed of offsite. The results of a soil and groundwater excavation conducted prior to the i remediation were summarized in a remedial workplan (Treadwell& Rollo 2004d) which was subsequently accepted by the SJCEHD (SJCEHD 2004e). The remedial completion report, (Treadwell & Rollo 2004e) is attached in Appendix C, and includes a summary of the remedial investigation, the remediation work, and a copy of the workplan acceptance letter from the SJCEHD. 6.0 QUALITY ASSURANCE/QUALITY CONTROL OF LABORATORY DATA The QA/QC steps taken to evaluate data acceptability included submitting and analyzing the results of field QC samples, and evaluating the:laboratory.reports. The field QC sampling program proposed in the RDIP included collecting: • One field blank per sampling device per mobilization;- k • One rinsate blank per sampling device per mobilization; • One set of field duplicates for every ten RAP excavations; and • One trip blank per cooler containing samples planned for.PAH analyses. l A trip blank is used to demonstrate that volatile contamination is not originating from sample containers or other factors during sample transport. Thus, trip-blanks are used for volatile analytes and not for PAH analyses, as PAHs are not volatile compounds. Consequently, no trip F blanks were prepared for coolers containing samples planned for PAH analyses, but were used in coolers containing samples planned for VOC and TPHg analyses. 25971025.DGD 17 11 August 2005