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ARCHIVED REPORTS XR0013118
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2900 - Site Mitigation Program
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PR0515454
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ARCHIVED REPORTS XR0013118
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Last modified
11/19/2024 10:19:10 AM
Creation date
12/14/2018 4:56:34 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0013118
RECORD_ID
PR0515454
PE
2960
FACILITY_ID
FA0012157
FACILITY_NAME
POMBO REAL ESTATE
STREET_NUMBER
1755
Direction
W
STREET_NAME
ELEVENTH
STREET_TYPE
ST
City
TRACY
Zip
95376
APN
23217020
CURRENT_STATUS
01
SITE_LOCATION
1755 W ELEVENTH ST
P_LOCATION
03
P_DISTRICT
005
QC Status
Approved
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EHD - Public
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oQolularwrx <br /> EB-9;samples of affected soil were collected at depths of 9.5 and 15 feet below ground surface(bgs), <br /> respectively. Total petroleum hydrocarbons(TPH)quantified as crude oil(rPHc),toluene,xylenes, <br /> and polynuclear aromatic hydrocarbons(PAHs)were detected in the soil samples collected from <br /> these borings(Table 1). No petroleum hydrocarbon-affected soil was observed in soil from borings <br /> EB-8 or EB-10 and,therefore,no soil samples were collected from these borings for chemical <br /> analysis. <br /> Based on these findings,Geomatrix advanced fifteen soil borings(GMX-1 through GMX-8 and <br /> GMX-13 through GMX-19;Figure 2)at the site between September 22 and 24, 1999. Petroleum <br /> hydrocarbon affected soil was observed in eight borings(GMX-2,GMX-5,CWC-6,GMX-7,GMX- <br /> 13,GMX-16,and GMX-18)between depths of 7 and 19 feet bgs. Soil samples were collected from <br /> four of these borings(GMX-2,GMX-6,GMX-7,and GMX-13). TPHc(Clo to C36)was detected in <br /> these four samples at concentrations ranging from 880 to 18,000 milligrams per kilogram(mg/kg), <br /> TPH quantified as diesel(TPHd;Go to Cry)was detected at concentrations ranging from 400 to 6800 <br /> mg/kg,and TPH quantified as gasoline CUB&C6 to Cl,)was detected at concentrations ranging <br /> from 150 to 1000 mg/kg Relatively low concentrations of ethylbenzene,xylenes and PAM were <br /> detected in two of these samples(GMX-2 and G DC-13). Benzene,toluene and methyl tertiary <br /> butyl ether(MTBE)were not detected in any of these samples. A forensic evaluation of the soil <br /> sample collected from boring GMX-6 indicated that the petroleum hydrocarbons present to the <br /> sample likely represented degraded low-boiling-range(such as gasoline)and high-boiling-range <br /> (such as crude oil)compounds. The forensic evaluation of the soil sample collected from boring <br /> GMX-13 indicated that the petroleum hydrocarbons present in the sample were primarily degraded <br /> low-boiling-range(such as gasoline)compounds. The degraded low-boiling-range compounds may <br /> be associated with the former Mohawk gasoline station at the site. <br /> To confirm the lateral extent of petroleum affected soil,a confirmation soil sample was collected <br /> directly above the water table(approximately 11 to 12. 5 fret bgs)from seven borings advanced <br /> outside of the area of visibly affected soil(GMX-1,GMX,3,GMX4,GMX-8,GMX-15,GMX-17 <br /> and GMX-19). TPHc,TPHd,and TPHg were not detected or were detected at concentrations less <br /> than 100 mg/kg in these samples. Benzene,toluene, ethylbenzene and xylenes(BTEX),MTBE and <br /> PAHs were not detected in any of these samples. Historical soil analytical results are cunni,anzod in <br /> Table 1. <br /> A grab groundwater sample was collected from beneath the affected soil in boring GMX-6. This <br /> sample was analyzed for BTEX,MTBE and PAHs. No BTEX or MTBE were detected in the <br /> sample. Fluorene and phenanthtcne were the only PAHs detected in the sample(concentrations of <br /> \WYDF7TOATAWOC_S�WS�7003TOMROSOIWWRPMOV00_DOC 2 <br />
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