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i <br /> s <br /> 07 May 2009 <br /> AGE-NC Project No. 97-0343 <br /> Page 4 of 7 <br /> database; confirmation numbers are 8318686246 and 6202059090. <br /> 3.2. FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL <br /> Hydrocarbon odor was noted the total depth of confirmation boring P 1,and slight hydrocarbon odor <br /> was noted at depths of 5 feet and 25 feet bsg in confirmation boring P2. Organic vapor(confirmed <br /> with the PID) was encountered in boring P1 at depths between 10 feet and 50 feet bsg at <br /> concentrations as high as 227 parts per million volume (ppmv); organic vapor was encountered in <br /> boring P2 at depths of 5 feet and 25 feet bsg at concentrations of 0.1 ppmv. Hydrocarbon odor and <br /> organic vapor observations are noted on the boring logs in Appendix B. <br /> 3.3. ANALYTICAL RESULTS OF SOIL SAMPLES <br /> A total of seven and ten soil samples were analyzed from borings P1 and P2, respectively. <br /> Constituents were not reported at or below detection limits in the samples analyzed from P2. <br /> TPH-g were reported at depths of 10 feet, 20 feet, 25 feet, and 30 feet bsg in boring P1 at <br /> concentrations ranging between 33 milligrams per kilogram(mg/kg;P1-10)and 920 mg/kg(P 1-20). <br /> TPH-d were reported at depths of between 10 feet and 30 feet bsg in boring P1 at concentrations <br /> ranging between 70 mg/kg (P1-15) and 7,800 mg/kg (P1-25). <br /> No additional target analytes, including BTEX and 1,2-DCA, were reported at or below detection <br /> limits in the samples analyzed. Soil sample analytical results are summarized in Table 1; <br /> comparisons of analytical results from pre-remediation and post-remediation soil samples within the <br /> former UST area(P1, B5, MW-1, and MW-9) and south of the former UST area(P2, B1, B3, and <br /> MW-2) are summarized in Table 2. The laboratory report (CTEL Project ID CT214-0904114), <br /> quality assurance and quality control(QA/QC)and chain-of-custody forms are included in Appendix <br /> C. The laboratory electronic data file (EDF) was uploaded to the State Geotracker database; the <br /> confirmation number is 2690178990. <br /> 3.4. MASSNOLUME CALCULATIONS <br /> Remaining adsorbed hydrocarbon masses were determined based on analytical results of soil samples <br /> collected from soil borings advanced during site assessment activities.The current mass and volume <br /> estimates represent data collected following active soil remediation. ' <br /> Advanced GcoEnvironmcntal,Inc. <br />