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ARCHIVED REPORTS_XR0012190
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3500 - Local Oversight Program
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PR0545890
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ARCHIVED REPORTS_XR0012190
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Last modified
7/22/2020 12:23:34 PM
Creation date
7/22/2020 11:28:35 AM
Metadata
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Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0012190
RECORD_ID
PR0545890
PE
3526
FACILITY_ID
FA0025958
FACILITY_NAME
ROEK BROTHERS CONSTRUCTION
STREET_NUMBER
102
Direction
S
STREET_NAME
WILSON
STREET_TYPE
WAY
City
STOCKTON
Zip
95205
APN
15502065
CURRENT_STATUS
02
SITE_LOCATION
102 S WILSON WAY
P_LOCATION
01
P_DISTRICT
001
QC Status
Approved
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EHD - Public
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I� <br /> I ' I <br /> r <br /> I <br /> Groundwater would continue to be monitored until concentrations of gasoline hydrocarbons <br /> in groundwater have diminished sufficiently to meet regulatory agency requirements <br /> f <br /> 3.23 Alternative 3 - Soil Vapor Extraction with Groundwater Monitoring <br /> This alternative involves remediation of impacted soils by vapor extraction with continued <br /> groundwater monitoring Initiation of a soil vapor extraction system would include the <br /> following activities preparing plans and specifications, obtaining necessary permits, and installing the vapor extraction piping, treatment compound, and off-gas treatment device <br /> (thermal oxidizer and granular activated carbon in the later stages of vapor extraction) The <br /> vapor extraction system would be monitored at least monthly or at the frequency specified by <br /> the San Joaquin Valley Unified Air Pollution Control District (APCD) Groundwater <br /> monitoring would continue on a regular basis until it is determined that source removal is <br /> ' allowing natural attenuation of gasoline hydrocarbons in groundwater to occur and the <br /> potential for additional groundwater impaction is limited <br /> 32.4 Alternative 4 - Soil Vapor Extraction, Air Sparging, and Groundwater <br /> k ' Monitoring <br /> ' Vapor extraction with air sparging is considered a potential remedial alternative because of <br /> site soil characteristics Air sparging injects pressurized air into the groundwater via a well <br /> or wells that are screened below the water table As the air rises through the aquifer it <br /> volatilizes dissolved gasoline hydrocarbons in groundwater and residual hydrocarbons <br /> ase <br /> adsorbed in the soil below the water table and transfers them to the y <br /> gaseous phase The <br /> process gas rises to the unsaturated zone, where it is collected by vapor-extraction and routed <br /> to a vapor-abatement system The introduction of air into the aquifer also increases the <br /> E quantity of oxygen available for hydrocarbon consuming biological activity Relatively <br /> permeable soils are necessary for air sparging to be effective As indicated by the soil <br /> ' boring logs, the soil sediment types in the water bearing zone beneath the site are generally <br /> sandy and permeable which would allow homogeneous dispersion of contaminants in the <br /> water bearing zone However, as shown in soil boring logs of wells MW5, MW6, and <br /> MW7, lower permeability intervals are present This lithologic heterogeneity could allow <br /> preferential flow within the more permeable layers thus reducing the effect of air sparging <br /> ' Initiation of a soil vapor extraction/air sparging system would include the following <br /> s activities preparing plans and specifications, obtaining necessary permits, installing air <br /> sparging wells at the site, and installing the vapor extraction piping, treatment compound, <br /> and off-gas treatment device (thermal oxidizer and granular activated carbon in the later <br /> stages of vapor extraction) The vapor extraction system would be monitored at least <br /> monthly or at the frequency specified by the San Joaquin Valley Unified Air Pollution <br /> Control District (APCD) Groundwater monitoring would continue on a regular basis until it <br /> is determined that air sparging has reduced groundwater contaminant concentrations to the <br /> point where natural attenuation of gasoline hydrocarbons m groundwater is the dominant <br /> reduction mechanism <br /> grmn&6rnck,cap I 1 <br /> 6 <br />
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