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ARCHIVED REPORTS_XR0005010
Environmental Health - Public
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MONTE DIABLO
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2900 - Site Mitigation Program
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PR0535112
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ARCHIVED REPORTS_XR0005010
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Last modified
9/16/2020 1:08:36 AM
Creation date
3/17/2020 2:51:54 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0005010
RECORD_ID
PR0535112
PE
2957
FACILITY_ID
FA0020296
FACILITY_NAME
CHAPIN BROTHERS INC
STREET_NUMBER
1766
STREET_NAME
MONTE DIABLO
STREET_TYPE
AVE
City
STOCKTON
Zip
95203
APN
13505050
CURRENT_STATUS
01
SITE_LOCATION
1766 MONTE DIABLO AVE
P_LOCATION
01
P_DISTRICT
001
QC Status
Approved
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Low concentrations of petroleum hydrocarbons were detected in soil samples from MW-3, MW-4 <br /> and VW-1 No hydrocarbons were detected in soil samples from MW-2 Eight additional soil <br /> bonngs were drilled in March 1994 Seven of the eight soil borings were drilled off-site, south and <br /> southwest of the site The data indicated that impacted soil extends approximately 180 to 200 feet <br /> off-site to the southwest,however,most of the off-site impacted soil contains very low concentrations <br /> of petroleum hydrocarbons <br /> FREE-PRODUCT IN GROUND WATER <br /> It is our understanding that prior to January 1995, groundwater samples from the site had been <br /> collected on three occasions During each sampling event, free hydrocarbon product was detected <br /> in MW-1, therefore, no samples were collected Free hydrocarbon product was encountered in <br /> MW-1 and MW-4 <br /> AQUIFER TESTING AND ANALYSIS <br /> A pump test was performed at the site by SEACOR Groundwater was extracted from MW-1 and <br /> drawdown was measured in three surrounding wells The test duration was approximately 24 hours <br /> SEACOR concluded in the PAR that drawdown data collected during the pump test indicated that <br /> the pumping from MW-1 has little influence at the site Therefore, a pump and treat system of <br /> ground water remediation would likely be ineffective at the site Complete pump test data was <br /> included in the PAR <br /> SOIL VAPOR EXTRACTION TEST <br /> On 10 June 1994 a soil vapor extraction test was conducted at the site A vacuum was applied to an <br /> extraction well (VW-1) and measurements of flow rate and vacuum were collected from three <br /> temporary observation wells(VW-2,VW-3 and VW-4) However,a vacuum could not be achieved <br /> on VW-1, so the internal combustion (IC) unit was connected to one of the observation wells It <br /> appears that VW-1 may have been placed too close to the western UST excavation, which was <br /> backfilled with pea gravel, and "short circuited" the attempt to draw a significant vacuum Despite <br /> the short circuiting of VW-1,the test concluded that vapor extraction would be a viable remediation <br /> alternative for impacted soil at the site The data collected during the pilot test indicated that <br /> sufficient flow and hydrocarbon recovery rates can be achieved at the site <br /> ADDITIONAL ASSESSMENT OF HYDROCARBON IMPACTED SOIL AND <br /> REMEDIATION INSTALLATION <br /> From 03 to 05 Tanuary1995, a total of five soil borings were drilled at the site The bonngs P-1,P-2 <br /> and P-3 were di filled to depths of 27 feet Boring P-4 was drilled at an angle of approximately 30° <br /> Advanced GcoEnvironmental,Inc <br />
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