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Geelegicat Technics Inc. '"' Page 2 VETS Work Plan Project No. 750.2 February 12,2004 On June 12, 2000, GTI and Del-Tcch Geo Technical performed a vapor extraction pilot test at the site. Laboratory and field test results indicate the site is conducive to remediation by �a val'ar extraction. On June 12. 2000, Ms. Lori Duncan of SJC PHS/hHD requested in writing that a work plan be prepared to define the lateral and vertical extent of the groundwater plume at the site. On June 29, 2000, GTI prepared a work plan proposing the installation of two water table monitoring wells and one deep, discretely screened monitoring well. Ms Duncan approved the work plan on July 7, 2000. The work was performed during the week of October 16, 2000. On January 30, 2001, GTI prepared and submitted the Corr•ecti►�e Action Plast (Revised) t'ado.ve Zone Remediation. The CAP discusses GTI's proposed methodology for mitigation of the documented petroleum hydrocarbon contamination at the site by vapor extraction. The CAP also discusses the confirmation testing outlined in this work plan. The CAP, as submitted, was approved by Ms Duncan in a letter dated April 02, 2001 In February 2002 the soil vapor extraction system was initiated and has operated for the past year. Contaminant mass estimate calculations show that approximately 50% of the petroleum hydrocarbons contained in the subsurface at this site has been removed. The groundwater at this site is free of petroleum hydrocarbon contamination and possibly as much as 600 gallons of gasoline may remain in the vadose zone. On March 28, 2003, GTI submitted a work plan for additional site characterization. The work plan was approved, with reservation, by Lori Duncan in a letter dated April 8, 2003. On September 5, 2003, GTI and Gregg Drilling installed, logged and sampled two soil borings. The soil borings revealed that the bulk of the contamination has been removcd from the site. Details are discussed in the Interim Soil Investigation Report dated October 2. 2003. On December 9, 2003, a source test was conducted on the internal combustion engine (VC), San Joaquin Valley Unified Air Pollution Control District (SJCUAPCD) Authority to Construct (N-4546-2-0). The I/C failed to comply with the VOC limits established by the SJCUAPCD. On January 14, 2004, the I/C was shut down. This work plan discusses modifying the vapor extraction treatment system (VETS). GTI. proposes to pull vapors from the vadose zone with a blower and treating the vapors with Granular Activated Carbon (GAC).