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3 <br /> c ' March 2, 2009 <br /> Mars's Diesel Service ''' -3- <br /> Claim No. 7709 <br /> VI. SOIL AND GROUNDWATER i EMEDIATION <br /> A. Soil Excavation: unknov.n ,.'oIume <br /> B. In-Situ Soil Remediation: none identified - <br /> • METHOD: bioventinc <br /> • DURATION: proposed <br /> C. Groundwater Remediation: <br /> METHOD: biospargi;Ig <br /> DURATION: proposed <br /> D. Groundwater Trends: <br /> • TPH-D trends are shown below: - <br /> DIESEL RANGE-ORGANICS Re'sults.;for <br /> y£ <br /> -35b00 <br /> 30000 } — - • <br /> 25000 <br /> 20000 <br /> 15000 <br /> 10000 t <br /> �k L t I• 7 R <br /> i <br /> 7 -t_71t f 1 f f <br /> ,• .# <br /> ® DIESEL RANGE ORGANICS Trend ' l.Hr' <br /> VII. SENSITIVE RECEPTOR SURVEY: 17 wells identified within Y2 mile of the site <br /> - VIII. COMMENTS AND JUSTIFICATION.FOR RECOMMENDED ACTION <br /> A. Site Description: shop and diesel fueling area <br /> B. Site History: the extent of groundwater contamination is`defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: bioventing and biosparging proposed <br /> E.' Contaminant Exposure Pathway Evaluation: unknown F <br /> F. Recommendation: Based on the following criteria; the Fund recommends this <br /> site be considered for closure providing the potential for soil vapor migration is <br /> assessed and determined safe for prescribed site activities, public participation <br /> and fee title notifications are conducted, and the monitoring wells are <br /> appropriately abandoned: <br /> California Environmental Protection Agency <br /> �.d Recycled Paper <br /> 1 <br />