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ARCHIVED REPORTS XR0006513
EnvironmentalHealth
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6425
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2900 - Site Mitigation Program
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PR0519189
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ARCHIVED REPORTS XR0006513
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Last modified
8/21/2019 3:53:18 PM
Creation date
8/21/2019 3:03:33 PM
Metadata
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Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0006513
RECORD_ID
PR0519189
PE
2950
FACILITY_ID
FA0014347
FACILITY_NAME
CURRENTLY VACANT
STREET_NUMBER
6425
STREET_NAME
PACIFIC
STREET_TYPE
AVE
City
STOCKTON
Zip
95207
APN
09741031
CURRENT_STATUS
02
SITE_LOCATION
6425 PACIFIC AVE
P_LOCATION
01
QC Status
Approved
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EHD - Public
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groundwater for sulfate reduction is determined as follows <br /> EACs = 0 21 (SB-SM) <br /> Where EACs = Expressed Assimilative Capacity, sulfate reduction <br /> 0 21 = mg/L BTEX degraded per mg/L sulfate consumed ratio <br /> SR = background sulfate concentration (mg/L) <br />' SM = sulfate concentration in plume (mg/L.) <br /> A reduction in sulfate and BTEX conc,entrdtions within an existing BTEX plume is a strong <br />' indication that indigenous anaerobic microbes are established and actively biodegrading petroleum <br /> hydrocarbons via sulfate reduction <br />' Groundwater was also tested for aerobic and anaerobic biodegradation indicators (dissolved <br /> oxygen, nitrate as nitrogen, Ferrous iron, and sulfates) to identify the occurrence ofintrinsic <br /> biodegradation at the site No detectable concentrations of dissolved BTEX were identified in <br />' monitoring wells MW1, MW3, MW4, MWS, MW6, MW7, MW9, MWl 1, and MW13 and <br /> biodegradation indicator results did not support intrinsic, biodegradation <br />' Groundwater sample results collected in January 1999 identified BTEX in monitoring wells <br /> MW2, MW8, MW10, and MW12 exclusively at concentrations of 154 pg/L, 1332 µg/L, 42 ug/L, <br /> and 270 ug/L, respectively The relatively low dissolved oxygen concentrations in the shallow <br /> groundwater, ranging from 0 0 mg/L to 2 2 mg/L, support that aerobic biodegradation is not a <br /> significant terminal electron acceptor process at the site Of the above wells, only momtonng <br /> wells MW2 and MW12 identified sufficient dissolved oxygen concentrations to sustain aerobic <br /> biodegradation Fecal coloform was identified from groundwater testing performed in 1991 <br /> which may have influenced the levels of dissolved oxygen Furthermore, aerobic biodegradation <br /> is favorable at a redox greater than 500 mV yet the redox potential at the site ranged from 140 <br /> mV to -114mV which favors anaerobic biodegradation <br /> Groundwater sample results collected from MW2, MW8, MW10, and MW12 identified dissolved <br /> BTEX with corresponding decreased nitrate, elevated ferrous iron, and/or decreased sulfate levels <br /> relative to those wells which had no dissolved BTEX Average site concentrations of <br /> Ibiodegradation indicators were as follows 1 2 mg/L, as nitrates, 0 8 mg/L as ferrous iron, and <br /> 57 2 mg/L as sulfates Groundwater from monitoring well MW2 contained 154 ug,IL as BTEX <br /> 0 5 mg/L as nitrates, and 1 36 mg/L as ferrous iron Nitrate levels are decreased and ferrous iron <br /> levels are elevated compared to the site wide average Groundwater testing from MW8 identified <br /> decreased nitrate levels (0 mg/L), elevated ferrous iron levels (3 19 mg/L), decreased sulfate <br /> levels (53 mg/L), and BTEX (1332 ug/L) Monitoring well MW10 which contained 42 ug/L as <br /> BTEX identified elevated ferrous iron concentrations (I l mg,/L) and decreased sulfate <br /> concentrations (48 mg/L) compared to the site avec age Groundwater testing from MW12 <br /> identified decreased nitrate levels (0 3 m« ), elevated ferrous iron levels (1 15 mg/L), decreased <br /> sulfate levels (18 mg/L), and BTEX(270 ua) which supports the occuirence of anaerobic <br /> 18 <br />
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