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Chevron Products -3- March 3, 2011 <br /> Claim No. 5820 <br /> A. Soil Excavation: unknown volume <br /> B.. In-Situ Soil/ Groundwater Remediation: <br /> • METHOD 1: dual phase extraction pilot test <br /> • DURATION: 4 days in 2003 <br /> • MASS OF TPH-G REMOVED: 22 pounds <br /> • METHOD 2: ozone sparging pilot test <br /> C. Groundwater Trends: Benzene trends are shown below, source area and down <br /> gradient, respectively. <br /> BENZENE'Results'fa MiW-i 5,), <br /> .3000 4t F- <br /> .2.2 <br /> 2000 <br /> 1500•--.__ <br /> Cr <br /> ' 1000I <br /> 500L <br /> 4-------------- <br /> 04 <br /> 1 _ <br /> eu•w BENZENE <br /> BENZENE'Results for Mvv 7. ` <br /> ,45 <br /> 1 x•735 <br /> 25 — - <br /> X20 ` <br /> 0-4 <br /> ...j. IN <br /> . <br /> . Yy <br /> a amu BENZENE. ►-,*.. ..r`i' <br /> VII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: former retail gasoline station, empty lot <br /> B. Site History: the extent of groundwater contamination is defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> California Environmental Protection'Agency <br /> Zj'Recycled Paper <br />