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Appendix D Direct Push Bonng Investigation
<br /> Phase 11 ESA Multi-Modal Station"Six-Block Project"
<br /> January 6,2003
<br /> Page 13 of 15
<br /> • dichloroethene was detected at a concentration of 1 3 }ig/L in sample DBK5-805-1-6/3102 TCE was
<br /> detected at concentrations of 4 9, 13, 0 6, and 0 8 µg/L in samples DBK5-805-1-6/3/02, DBK5-805-2-
<br /> 6/3/02, DBK5-811-3-6/7102, and DBK5-829-2-6/12/02, respectively Toluene was detected at
<br /> concentrations of 0 7, 0 5, and 18 µg/L in samples DBK5-820-2-9/16102, DBK5-811-1-617102, and
<br /> DBK5-811-3-6/7/02, respectively PCE was detected at concentrations of 0 8, 3 4, and 9 7 µg/L in
<br /> samples DBK5-805-2-613/02, DBK5.811-2-6/7/02, and DBK5-829-1-6/12/02, respectively M,p-xylene
<br /> and o-xylene were detected at concentrations of 1 6 and 0 6 µg/L, respectively, in sample DBK5-829-2-
<br /> 6/12/02
<br /> A TCE contaminant plume appears to be located in the southwestern portion of Block 5 (805 and 811 E
<br /> Weber Avenue) The plume appears to be centered at boring location DBK5-805-2 and extends to boring
<br /> location DBK5-805-1 in the north, boring location DBK5-811-3 to the east, and boring location DG7 to
<br /> the southwest The extent of the plume to the northeast does not appear to be clearly defined
<br /> PCE concentrations appear in groundwater samples collected from the southern half of Blocks 5 and 6
<br /> These concentrations may not be linked, but for purposes of this report, they have been mapped as one
<br /> plume The highest concentration of PCE detected in samples collected at the site was from boring DA3,
<br /> located along the eastern boundary of Block 5 From DA3, the plume may extend to boring location
<br /> DBK6-931-1 in the east, boring location PAI in the south, and boring location DBK5-811-2 in the west
<br /> PCE concentrations were also noted in samples collected from PG1 and DBK5-805-2
<br /> Low concentrations of 1,1-DCE were noted in samples collected from boring locations DC6 and DBK5-
<br /> 820-1 in the northern portion of Block 5 As there are no samples between boring locations DG3 and
<br /> DC6, it is unknown if these concentrations are linked to the 1,1-DCE plume at Block 4
<br /> • 4 7 BLOCK 6
<br /> From May 28 to May 29, 2002, five Geoprobe borings and four detection borings were installed on three
<br /> parcels of Block 6 Geoprobe, detection, and hydropunch boring locations for Block 5 is presented in
<br /> Figure 11,Appendix A
<br /> Laboratory analytical results indicated acetone, carbon disulfide, 2-butanone, toluene, ethylbenzene, m,p-
<br /> xylene, o-xylene, isopropylbenzene, n-propylbenzene, 1,3,5-tnmethylbenzene, tert-butylbcnzene, 1,2,4-
<br /> tnmethylbenzene, 4-isopropyltoluene, 1,2-dichlorobenzene, n-butylbenzene, naphthalene, 1,2-
<br /> dichlorobenzene, 4-methylphenol, TPH-G, TPH-D, and TPH-MO were detected in the soil samples
<br /> collected from boring GBK6-931-1 at various depths In addition, 4-methylphenol, TPH-G, TPH-D, and
<br /> TPH-MO were detected in soil samples collected from GBK6-931-2
<br /> Acetone was detected at concentrations of 0 35, 0 59, and 0 55 mg/kg in samples GBK6-931-1-6, GBK6-
<br /> 931-1-10, and GBK6-931-1-15, respectively Carbon disulfide was detected at concentrations of 0 005
<br /> and 0 007 mg/kg in samples GBK6-931-1-6 and GBK6-931-1-15, respectively 2-Butanone was detected
<br /> at a concentration of 0 048 mg/kg in sample GBK6-931-1-15 Toluene was detected at concentrations of
<br /> 0 043 and 0 11 mg/kg in samples GBK6-931-1-6 and GBK6-931-1-15, respectively Ethylbenzene was
<br /> detected at a concentration of 0 011 mg/kg in sample GBK6-931-1-15 M,p-xylene was detected at
<br /> concentrations of 0 017 and 0 047 mg/kg in samples GBK6-931-1-6 and GBK6-931-1-15, respectively
<br /> O-xylene was detected at concentrations of 0 037 and 0 11 mg/kg in samples GBK6-931-1-6 and GBK6-
<br /> 931-1-15, respectively Isopropylbenzene was detected at concentrations of 0 033 and 0 092 mg/kg in
<br /> samples GBK6-931-1-6 and GBK6-931-1-15, respectively N-propylbenzene was detected at
<br /> . concentrations of 0 10, 0 006, and 0 38 mg/kg in samples GBK6-931-1-6, GBK6-931-1-10, and GBK6-
<br /> 931-1-15, respectively 1,3,5-Tnmethylbenzene was detected at concentrations of 0 63, 0 023, and 1 3
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