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ARCHIVED REPORTS_XR0005088
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ARCHIVED REPORTS_XR0005088
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Last modified
9/16/2020 1:42:05 AM
Creation date
3/18/2020 4:03:36 PM
Metadata
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Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0005088
RECORD_ID
PR0545571
PE
3528
FACILITY_ID
FA0003570
FACILITY_NAME
BOBS MUFFLER & RADIATOR
STREET_NUMBER
466
STREET_NAME
MOFFAT
STREET_TYPE
BLVD
City
MANTECA
Zip
95336
APN
22104019
CURRENT_STATUS
02
SITE_LOCATION
466 MOFFAT BLVD
P_LOCATION
04
P_DISTRICT
005
QC Status
Approved
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I I February 2003 <br /> AGE-NC Project No. 98-0520 <br /> ' . Page 20 of 21 <br /> 8.1. REMEDIATION OF HYDROCARBON-IMPACTED SOIL <br /> Soil impacted primarily by TPH-g, TPH-d, and TPH-mo extends vertically to the saturated zone <br /> under the former UST and surrounding areas to an approximate depth of 25 feet bsg (Figures 3B <br /> and 4B); however; ground water level at the site has been decreasing, and currently essentially all . <br /> of the impacted soil is located within the vadoze zone. AGE believes that vapor extraction would <br /> ' be the most effective method for remediating the impacted soil. Excavation of all petroleum <br /> hydrocarbon-impacted soil within the vadose zone would require the potential removal of a large <br /> volume of overburden soil and the use of shoring and special equipment for the upper 20 feet of <br /> ' sandy soil.In addition,because of the length of time required andpotential problems with regulatory <br /> approval for in-situ bioremediation, there appears to be a low feasibility for bioremediation and <br /> monitored natural attenuation. Soil remediation methods, estimated durations and associated-costs <br /> are summarized on Table 4. <br /> A Remedial Action Work PIan detailing the proposed soil vapor extraction, program should be <br /> prepared. <br /> ,. 8.2. REMEDIATION OF HYDROCARBON-IMPACTED GROUND WATER <br /> Because only TPH is of concern and there are no ground water receptors within 2,000 feet of the <br /> ' site, AGE believes that an in-situ method would be more cost effective over the."pump and treat"' <br /> and air sparging methods; both in-situ methods described in this CAP could be effective in <br /> remediating the site. However, due to limited regulatory acceptance, in-situ bioremediation of <br /> ' ground water may not be the most cost-effective remedial alternative for the site, and should not be <br /> relied upon as the primary method for remediation of impacted ground water. <br /> ' Because there appears to be a low feasibility for bioremediation and pump and treat, and because <br /> ground water,contaminants appear to be declining at a relatively rapid rate over three years of <br /> ' monitoring, AGE believes that soil vapor extraction of the hydrocarbon source (impacted soil),_ <br /> coupled with monitored natural attenuation, would be the most feasible method for remediating <br /> impacted ground water at the site. However, if ground water should rise above the maximum zone <br /> ' of contamination at 20 feet bsg, air or ozone sparging should be considered. Ground water <br /> remediation alternatives, estimated durations and associated costs, as applied to the whole site,,are <br /> summarized on Table 4. <br /> 9.0. LIMITATIONS <br /> ' Our professional services were performed using that degree of care and skill ordinarily exercised . <br /> .by environmental consultants practicing in this or similar.localities. The findings were based on <br /> Advanced GeoEnvironmental,Inc. <br />
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