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ARCHIVED REPORTS XR0009986
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0544793
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ARCHIVED REPORTS XR0009986
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Last modified
11/19/2024 10:19:02 AM
Creation date
9/3/2019 1:23:43 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0009986
RECORD_ID
PR0544793
PE
3528
FACILITY_ID
FA0006237
FACILITY_NAME
HONEST AUTO SALE AND REPAIR
STREET_NUMBER
595
Direction
E
STREET_NAME
ELEVENTH
STREET_TYPE
ST
City
TRACY
Zip
95376
APN
23337004
CURRENT_STATUS
02
SITE_LOCATION
595 E ELEVENTH ST
P_LOCATION
03
P_DISTRICT
005
QC Status
Approved
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SJGOV\wng
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EHD - Public
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2.0 Discussion <br /> Groundwater flow direction is northerly at a flow gradient that is consistent with historically <br /> observed northerly flow trends (see Figure 1) Periodic groundwater mounding present in the <br /> vacinrty of MW-3R and MW-9R is attributed to the recent soil excavation and replacement of <br /> native soil/sediment with somewhat more porous fill material <br /> TPHG concentrations increased in slightly in MW-2 and declined slightly in MW-9R since the <br /> previous quarter (see Figures 2, 3 and 4). Contaminants were not detected in well MW-3R <br /> Well MW-4 showed that contaminants were not detected MTBE and related oxygenates were <br /> not detected in any well Separate phase product was not observed in any well <br /> Selected combined Time vs Contaminant Graphs, (combined data of MW-3 and MW-3R, and <br /> combined data of MW-9 and MW-9R) were prepared to show overall lustoric dissolved trends <br /> that are attached to this report Wright has added the data from MW-3R and 9R to the same <br /> graphs since these wells were installed only about 5 feet from the previous locations It is <br /> Wright's opinion that the combining the historic data to the new wells in these graphs will enable <br /> ease in continued contaminant trend tracking in the areas of historically most elevated TPHG and <br /> Benzene plumes <br /> Soil excavation activities removed residual contaminant in the vadose zone and upper aquifer in <br /> the area around MW-3R and 9R Concentrations appear to continue a declining trend with <br /> contaminants not detected in MW-3R The interpreted location of the dissolved plume based on <br /> the historic groundwater flow and interpreted contour information continues to generally show <br /> very little to no net plume movement beyond the vicinity of wells MW-9R and MW-2 this <br /> quarter. <br /> 3.0 Conclusions and Recommendations <br /> Groundwater flow direction was northerly under a low calculated gradient and water levels in <br /> monitoring wells had changed slightly since the previous quarter The excavation area near <br /> MW-3R and MW-9R has somewhat more porosity than the native soil/sediment and may cause <br /> some localized groundwater mounding near Well MW-9R In our opinion, the mapped <br /> contaminant dissolved plume continues to occur near the center of the site, similar to historic site <br /> observations <br /> The TPHG and Benzene levels show a much lower dissolved concentrations in monitoring well <br /> MW-9R that is attributed to removal of residual contaminant Contaminants were not detected <br /> in well MW-3R this quarter <br /> Fluctuations of TPHG and Benzene may occur from desorption since some residual sources <br /> under the large utility pipelines could not be removed during the soil excavation given the <br /> . seasonal rise and fall of groundwater levels The site is scheduled for continued quarterly <br /> monitoring at this time <br /> Page 3 of 4 <br />
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