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ARCHIVED REPORTS XR0011752
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ARCHIVED REPORTS XR0011752
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Last modified
11/19/2024 10:19:08 AM
Creation date
9/4/2019 11:04:45 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0011752
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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---------------------- <br /> Report:Groundwater-quality Monitoring—July 27,2004: 7500 West Eleventh Street,Tracy, CA. Page 12 <br /> area of that well that are heavily affected by components of fuel hydrocarbons. If the <br /> observed trend continues, it may also be precursor to the return of floating LNAPL in that <br /> well, as has been the case in the past. (See Table 2 for the history of contaminant <br /> concentrations and floating product thicknesses in that well.) <br /> 2.5.2 Analytes of Concern in Groundwater around Fringes of Principal Plume <br /> The results of the groundwater-quality monitoring round conducted in July 2004 indicate <br /> that the plume perimeter on both its eastern and western sides has remained stable since <br /> the monitoring round conducted in April 2004. Trace concentrations of MTBE, at 2.1 and <br /> 19 µg/L in the samples recovered on July 27, 2004 from Monitoring Wells MW-2 and <br /> MW-5, respectively, when the resolution of the laboratory analytic procedure is <br /> considered, were essentially the same. Those wells are located at the western perimeter of <br /> the primary plume of affected groundwater. As was the case on April 30, 2004, no <br /> detectable concentrations of analytes of concern were present in groundwater recovered <br /> from Monitoring Wells MW-15 and MW-17,which are located along the west side of the <br /> primary plume. <br /> As is also the case for the sample recovered on April 21, 2004, no concentrations of any <br /> analytes of concern were detected in the groundwater recovered from Monitoring Well <br /> MW-9 on the eastern perimeter of the primary plume, and the concentrations of TPHg <br /> and MTBE in the sample recovered from Monitoring Well MW-10 remain at essentially <br /> trace levels. Similarly, in Monitoring Well MW-11, which is at the northern down- <br /> gradient extremity of the primary plume, the single analyte detected in the sample <br /> recovered from that well on July 27, 2004 was MTBE, at a concentration of 16 µg/L, <br /> which, while lower, is not significantly different from the concentration of 34 µg/L found <br /> in the sample recovered from that well on April 21, 2004. <br /> In the absence of any other detectable analytes of concern being present, traces of toluene <br /> ay 0.63 µglL and xylene isomers at 1.5 µg/L were detected in the sample of groundwater <br /> recovered from Monitoring Well MW-19 recovered on July 26, 2004. This was <br /> _ unexpected because that well is located a significant distance to the north of the primary <br /> plume of affected groundwater as its areal extent has been interpreted previously (see <br /> Figure 3 for current plume geometry) and the groundwater in that well was completely <br /> free of any concentrations of analytes of concern when it was last sampled on April 30, <br /> - 2004. <br /> f' At present, unless the presence or absence of analytes of concern in the groundwater in <br /> Monitoring Well MW-19 are confirmed by future rounds of groundwater monitoring, the <br /> detections reported by the laboratory for the July 2004 sample are judged to be spurious. <br /> This is because, in addition to the historical geochemical data from that area of the site, <br /> -i the laboratory reported that when initially analyzed, the sample recovered from that well <br /> appeared to contain a low concentration of TPHd; however, when the chromatogram was <br /> carefully examined, the laboratory's chemist suspected that the compound apparently <br /> present was not a fuel hydrocarbon in the diesel range and appeared to have been an <br /> artifact accidentally introduced at the laboratory. When the aliquot was re-analyzed for <br /> sic <br />
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