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23 June 2003
<br /> AGE-NC Project No 00-0769
<br />' Page 7 of 13
<br /> Hydrogeologic Unit 3 -(HU--3) was identified at depths between 140 feet and 160 feet bsg,
<br />' Hydrogeologic Unit 4 (HU-4) was identified at depths between 160 feet and 175 feet bsg and
<br /> Hydrogeologic Unit 5 (HU-5) was Identified at depths between 190 feet and 199 feet bsg
<br /> 1 �
<br /> 4 3 , ANALYTICAL RESULTS OF SOIL SAMPLES
<br />' A total of 28 soil samples were analyzed as described in Section 3 1 The highest concentrations of
<br /> petroleum hydrocarbon compounds were detected from soil samples collected at between 40 and
<br /> t60 feet bsg, in HU-1 Middle Zone (Figures 5 and 6)
<br /> TPH'g was detected In soil samples collected from soil borings MW-4, MW-5 and B-2 at
<br /> concentrations as high ,as 4,500 milligrams per kilogram (mg/kg) (MW4-58), 3,600 mg/kg
<br /> (MW5-50)'and 2,000 mg/kg (B2-50)
<br /> I
<br />' The BTEX compound benzene was detected in soil samples collected from MW-4, MW-5 and B-2
<br /> at maximum concentrations of 33 mg/kg(MW4-58), 21 mg/kg (MWS-50) and 20 mg/kg(B2-50),
<br /> toluene was detected at maximum concentrations of 180 mg/kg(MW4-58), 100 mg/kg(MW5-50)
<br /> and 54 mg/kg (B2-50), ethylbenzene was detected at maximum concentrations of 19 5 mg/kg
<br /> (MW4-58), 30 mg/kg (MW5-50) and 13 mg/kg (B2-50), and total xylenes were detected at
<br /> maximum concentrations of 224 mg/kg (MW4-58), 182 mg/kg (MW5-50) and 77 mg/kg(B2-50)
<br />' The lateral extent ofhydrocarbon-impacted soil is illustrated in cross sections A-A 'and B-B'(Figures
<br /> 5 and 6)
<br /> Fuel additives including DIPE,ETBE, MTBE, TAME, TBA, EDB and 1,2-DCA were not detected
<br /> in the soil samples collected and analyzed from the three soil borings
<br /> Additional VOCs detected in the analyzed samples included isopropylbenzene at maximum
<br /> concentrations of 5 5 mg/kg (MW4-58), 4 1 mg/kg (MW5-50) and 5 0 mg/kg (B2-50),
<br /> n-propylbenzene at maximum concentrations of 24 mg/kg (MW4-58), 13 mg/kg (MW5-50) and
<br /> 6 0 mg/kg(82-50), 1,3,5-tnmethylbenzene at maximum concentrations of 43 mg/kg(MW4-58),27
<br /> mg/kg (MW5-50) and 11 mg/kg (B2-50), 1,2,4-tnmethylbenzene at maximum concentrations of
<br /> 1 140 mg/kg(MW4-58),92 mg/kg(MW5-50)and 34 mg/kg(B2-50),p-isopropyltoluene at maximum
<br /> concentrations of 3 0 mg/kg (MW4-58) and 5 0 mg/kg (MW5-50), and napthalene at maximum
<br /> n
<br /> concentrations of 22 mg/kg(MW4-58), 37 mg/kg (MW5-50) and 5 0 mg/kg (B2-50)
<br /> 1 Analytical results of soil samples are summarized on Table 1 The laboratory report (CTEL
<br /> Laboratory IDs 0208-143-1, 0208-143-3, 0208-143-6, 0208-143-9, 0208-143-11, 0208-143-12,
<br />' 0208-143-14 through 0208-143-17,0208-144-4,0208-144-7,0208-144-10,0208-144-13,0208-144-
<br /> 16,0208-144-19,0208-144-22,0208-144-25,0208-144-28,0208-144-30,0209-021-9,0209-021-13,
<br /> Advanced GeoEnvi ron mental,Inc
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