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ARCHIVED REPORTS XR0011888
EnvironmentalHealth
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EHD Program Facility Records by Street Name
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ELEVENTH
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7675
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3500 - Local Oversight Program
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PR0544802
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ARCHIVED REPORTS XR0011888
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Entry Properties
Last modified
11/19/2024 10:19:08 AM
Creation date
9/4/2019 11:45:23 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0011888
RECORD_ID
PR0544802
PE
3528
FACILITY_ID
FA0005153
FACILITY_NAME
FAYETTE MANUFACTURING CORP
STREET_NUMBER
7675
Direction
W
STREET_NAME
ELEVENTH
STREET_TYPE
ST
City
TRACY
Zip
95376
APN
25014012
CURRENT_STATUS
02
SITE_LOCATION
7675 W ELEVENTH ST
P_LOCATION
99
P_DISTRICT
005
QC Status
Approved
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EHD - Public
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i <br /> y <br /> with an increase in carbon dioxide in the subsurface. Therefore low concentrations of dissolved <br /> oxygen and corresponding high concentrations of carbon dioxide within hydrocarbon plume <br /> indicate biodegradation is taking place (Borden and others, 1995). <br /> In anaerobic environments microorganisms may use other compounds such as nitrate, ferric iron, <br /> manganese, sulfate, and sulfide as electron acceptors. Thus, an increase in ferrous iron, carbon <br /> dioxide, dissolved manganese (Mn 11), and perhaps sulfide and a corresponding decrease in nitrate <br /> and/or sulfate within a hydrocarbon plume may indicate biodegradation is taking place. <br /> Additional indicators of anaerobic biodegradation include total alkalinity, redox potential (Eh) <br /> (Buscheck and O'Reilly, 1995), and methane (Borden and others, 1995). The total alkalinity of a <br /> groundwater system is indicative of the water's capacity to neutralize acid. Alkalinity results from <br /> the dissolution of rock (particularly carbonate rocks), the transfer of carbon dioxide from the <br /> atmosphere, and the respiration of microorganisms. Therefore, an increase in alkalinity within a <br /> hydrocarbon plume is potentially an indicator of bioremediation occurring (Buscheck and <br /> O'Reilly, 1995). The redox potential of groundwater generally ranges from -400 millivolts (mV) <br /> to 800 mV. Under oxidizing conditions the redox potential of groundwater is positive while <br /> reducing conditions are negative. The redox potential inside a hydrocarbon plume should be less <br /> than that measured outside the plume (Buscheck and O'Reilly, 1995), and generally negative. <br /> Methane levels generally increase within the plume as a byproduct of the breakdown of petroleum <br /> hydrocarbons under anaerobic conditions (Borden and others, 1995). <br /> Indicators of potential intrinsic biodegradation occurring across a dissolved contaminant plume <br /> can be summarized by the following trends: <br /> A relative decrease in: A relative increase in: <br /> dissolved oxygen ferrous iron <br /> oxidation-reduction potential alkalinity <br /> nitrate carbon dioxide <br /> sulfate <br /> GROUNDWATER SAMPLING AND GRADIENT EVALUATION <br /> Smith Technology personnel performed the latest quarterly groundwater monitoring of <br /> monitoring wells on December 16, 1996. Field work consisted of measuring depth-to-water <br /> levels in all wells and collecting groundwater samples from all wells and submitting groundwater <br /> samples for laboratory analysis. <br /> Water level measurements were collected from groundwater monitoring wells MW-1, MW-2, and <br /> MW-3. The depth to water ranged from 6.84 to 8.30 feet below top of well casing elevation. <br /> Groundwater elevations have increased an average of 0.19 feet since September 25, 1996. The <br /> water level data were used to develop the groundwater elevation contour map (Figure 2). <br /> Assuming that horizontal isotropic conditions prevail, groundwater in the uppermost aquifer <br /> wA95122aeportsl4QMR1996.doc 3 <br /> • <br /> SMTI� <br />
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