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TABLE 1 SUMMARY OF FULL-SCALE INSITU REMEDIATION ACTIVITIES FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 1 of 2 Volume Treatment Injected Date Description Target Areas Number of Borings/Locations (gallons) Reference Document Full-scale in situ Shallow Zone in North and South January 16- 509 temporary soil borings for June 5,2008 remedial action Yards,residential areas south of the reductant injection 2,290,500 implementation site,and adjacent high school property MWH,2008. Remedial Action In situ chromium Implementation Completion Report, May 30-June Shallow groundwater at the former Two recently-installed horizontal 25,2008 reduction at the retort pit treatment wells 90,800 Former Marley Cooling Tower former retort pit Company. October Flushing of vadose June -July zone at the former Vadose zone soil at the former retort pit Five recently-installed horizontal 29,,2008 flushing wells 1,150,000 2 retort pit MWH,2009. 2009 Semiannual Groundwater Monitoring and In situ chromium Evaluation Report,Full-Scale In Situ January 5 -26, Shallow groundwater at the former 2009 reduction at the retort pit Two horizontal treatment wells 90,800 Chromium VI Reduction Treatment former retort pit Implementation,Former Marley Cooling Tower Site,Stockton, MWH,2010. 2010 Semiannual Groundwater Monitoring and In situ chromium Evaluation Report,Full-Scale In Situ 2010 retort pit March 11-30, reduction at the Shallow groundwater at the former Two horizontal treatment wells 90,000 Chromium VI Reduction Treatment former retort pit Implementation,Former Marley Cooling Tower Site,Stockton, California. August. MWH,2011. 2010 Annual 11 temporary soil borings at the Groundwater Monitoring and September 9- Shallow and Intermediate Zones around Evaluation Report,Full-Scale In Situ October 29, Supplemental t situ the former retort pit;Intermediate Zone former retort pit; 17 temporary soil 1,800,000 Chromium VI Reduction Treatment 2010 treatment in the North and South Yards borings in the North and South Implementation,Former Marley Yards Cooling Tower Site, Stockton, California.January.