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ARCHIVED REPORTS XR0011743
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3500 - Local Oversight Program
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PR0544801
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ARCHIVED REPORTS XR0011743
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Entry Properties
Last modified
11/19/2024 10:19:08 AM
Creation date
9/4/2019 10:58:29 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0011743
RECORD_ID
PR0544801
PE
3528
FACILITY_ID
FA0003210
FACILITY_NAME
TEXACO TRUCK STOP
STREET_NUMBER
7500
Direction
W
STREET_NAME
ELEVENTH
STREET_TYPE
ST
City
TRACY
Zip
95378
APN
25015018
CURRENT_STATUS
02
SITE_LOCATION
7500 W ELEVENTH ST
P_LOCATION
03
P_DISTRICT
005
QC Status
Approved
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EHD - Public
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Extended Site Characterization Report: 7500 West Eleventh Street, Tracy, CA. Page 35 <br /> j- been located there. However, no such feature has been discovered at that location (Dietz <br /> 1998). <br /> 7.3.2 Prima Plume of Diesel and Gasoline <br /> ,J SJC developed its interpretation of the primary plume of fuel hydrocarbons emanating <br /> from the 7500 West Eleventh Street in stages as information became available from the <br /> progressive phases of subsurface investigation. That process is described below. <br /> 7.3.2.1 Primary Plume Directly Beneath Subject Property <br /> -� Examination of the results of analyses of groundwater(as presented in Table 4) recovered <br /> in April and May 2000 from Exploratory Boring PP-3 and Monitoring Well MW-3 <br /> 4 <br /> (which, as shown on Figure 2, are located near the West Eleventh Street frontage of the <br /> :.. former fueling station, a short distance down-gradient from the location of the dispenser <br /> islands), reveals moderate- to-high concentrations of petroleum hydrocarbons, the <br /> molecular chains of which are in both the diesel and gasoline range. Those concentrations <br /> amount to 14,000 µg/L and 2,800 µg/L of diesel-range product in groundwater recovered <br /> :1 from PP-3 and MW-3, respectively. The corresponding concentrations of gasoline-range <br /> product were 1,600 pg/L and 11,000 pg/L, respectively. <br /> To the west of PP-3 and MW-3, the concentration of diesel-range hydrocarbons in <br /> groundwater recovered from PP-2 in April 2000 was only 190 pg/L, and the <br /> corresponding value for gasoline-range hydrocarbons was only 300 µg/L. Further to the <br /> -`� west, there were no detectable concentrations of either diesel or gasoline in the sample of <br /> groundwater recovered from groundwater recovered on May 11, 2000 from MW-2, <br /> which is located near the western boundary of the subject property, although the sample <br /> from that well did contain 7.7 pg/L of benzene, 0.86 pg/L of ethyl benzene, 1.1 pg/L of <br /> total xylene isomers and 4.6 gg/L of MTBE. <br /> a <br /> Directly to the east of PP-3 and MW-3, the concentrations of diesel- and gasoline-range <br /> hydrocarbons in groundwater recovered from PP-4 and MW-4 in April and May 2000 <br /> were significantly reduced, compared to those in locations close to the area where the <br /> fuel dispensing pumps had been located. The concentrations of diesel-range fuel in <br /> groundwater recovered from PP-4 and MW-4 in April and May 2000 were 400 gg/L and <br /> 300 pg/L, respectively. The corresponding concentrations of gasoline in the groundwater <br /> at those locations were 880 pg/L and 52 pg/L, respectively. (Note: A similar relationship <br /> exists between the concentrations of MTBE in samples of groundwater recovered from <br /> MW-2, MW-3 and MW-4: MTBE was present in MW-3 at a concentration of 10,000 <br /> } L but less than 1 000 IL in MW-4 and as noted above there was only 4.6 <br /> p� � pg � Y pg/L of <br /> that oxygenate in the groundwater sample recovered from MW-2.) <br /> By examining the results of analysis of samples of soil recovered from PP-2, PP-3 and <br /> PP-4 and MW-2, MW-3 and MW-4 that are presented in Table 3, it can be seen that the <br /> jdistribution of fuel hydrocarbons in the soil reflects their distribution in groundwater. <br /> f 1 <br /> --` sic <br /> - s <br />
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