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Dual Phase Extraction Pilot rest Work Plan <br /> Former Beneto Facility, 749 East Charter Way, Stockton, California <br /> Page 2 <br />� . a <br /> July 1993 — CGG supervised the installation of groundwater monitoring wells MW-7 and MW-8 . <br /> Field activities were detailed in CGG's Site Assessment and Quarterly Report, dated April 24, <br /> q _ 1993 . <br />�I a September 1994 — CGG supervised the installation of groundwater monitoring wells MW-9, <br /> MW-10, and MW- 11 . Field activities were detailed in CGG's Site Assessment and Quarterly <br /> Report, dated October 10, 1994. <br /> .1 , <br /> June 19, 1995 — CGG supervised the advancement of soil borings HP- 1 and HP-2. Field <br /> activities were detailed in CGG's Activity Report, dated June 30, 1995 . <br /> February and March 1996 — CGG supervised the installation of six vapor extraction wells (VW- 1 <br /> through V W-6). Field activities were detailed in CGG' s Activity Report, dated March 19, 1996 , CYn) NJ <br /> V � <br /> ' April 29 and 30, 1996 — CGG supervised the advancement of soil borings HP-3 and HP-5 . Field Jam , <br /> - activities were detailed in CGG' s Quarterly Activity Report, dated June 10, 1996. r1?k <br /> W <br /> July 15 and 16, 1999 — CGG supervised the installation of monitoring well MW- 12 and vapor <br /> extraction well VW-7. Field activities were detailed in CGG's Drilling Activity eport dated <br /> A <br /> l.t,d.BlY'Z <br /> August 5, 1999. A soil vapor extraction remediation system was operated at the site by CGG A S t <br /> from 1997 through 2003. <br /> November 6, 2000 — CGG supervised the advancement of soil borings B-2 and B-3, and the <br /> installation of monitoring well MW-13 . Field activities were detailed in CGG' s Drilling Activity <br /> Report, dated December 14, 2000. <br /> July 27 and 28, 2005 — CGG supervised the advancement of boring 134 and the installation of <br /> groundwater monitoring wells MW- 14 and MW- 16. Field activities were detailed in CGG' s <br /> Drilling Activity Report, dated August 24, 2005 . <br /> June 2006 — Lee & Pierce, hic. (L&P) were contracted by Beneto to bring the site into <br /> compliance with all regulatory agencies. <br /> October 9 and 18, 2006 — L&P supervised the installation of deep groundwater monitoring wells <br /> MW- 17B and MW- 18C. Field activities were detailed in L&P ' s Investigation Summary Report, <br /> Installation of Deep Monitoring Wells, dated May 15 , 2007 . <br /> i I <br /> February 2008 — Apex was contracted by Bencto to bring the site into compliance with all <br /> regulatory agencies . <br /> December 22, 2008 — Apex submitted the Updated Site Conceptual Model and Remedial Action <br /> Plan. <br /> ' I <br /> k9 <br /> Jt <br />