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Gta4kat r¢cknuslnc Page 2 Pre-Bench Test Rpt George's Service Project No 425 2 March 10,2005 In the letter dated June 28, 2004, Nuel C Henderson, Jr , R G , San Joaquin County ' Environmental Health Department (SJC/EHD) reviewed and accepted the proposed method of in situ oxidation remedial method in the Feasibility study dated 28 April 2004, and directed GTI to prepare and submit the work pian for Bench Scale Testing GTI prepared and ' submitted the Work Plan dated August 16, 2004 for Bench Scale Study to Mr Nuel Handerson of SJC/EHD and Mr James Barton of California Regional Water Quality Control Board — Central Valley Region (CRWQCB-CV) Mr James Barton on a telephone ' conversation (September 22, 2004) with GTI discussed the issue of pre-bench scale testing to determine to go to pilot testing by skipping the full Bench Scale Testing After the telephone conversation with Mar James Barton, GTI discussed this issue with Dr Angus McGrath of ' SECOR International Incorporated Dr Angus McGrath agreed to write the report based on his other similar studies of chemical oxidation from the groundwater and soil analysis from the anticipated target zones of chemical oxidation Mr James Barton directed GTI to write ' the Work Plan Addendum for Pre Bench Scale/Pilot Testing GTI prepared and submitted the Plan Addendum—Pre Bench Scale /Pilot Testing dated September 22, 2004 to SJC/EHD and CRWQCB-CV Mr James Barton approved the work plan in the letter correspondence ' dated October 4, 2004 with some conditions The purpose of this Pre Bench Scale Testing and study was to determine whether a full Bench Scale Testing is necessary prior to a Pilot Study GTI personnel and Gregg Drilling (sub contractor) collected water and soil samples on December 27, 2004 according to the work plan and the samples were submitted to ' Excelchem Environmental Labs The lab results of these water and soil samples were submitted to Dr Angus McGrath to write an evaluation report of metal analysis in lieu of bench scale study for chemical oxidation With the direction from Dr Angus (after the ' telephone conversation between Mr Jim Barton and Dr Angus) GTI collected water samples on February 08, 2005 from MW-1 (screen interval 5 feet to 20 feet bgs) and MW-101 (screen interval 32 5 feet to 35 feet bgs), and the results were submitted to Dr Angus McGrath Dr Angus McGrath presented the evaluation report dated March 9, 2005 which is attached in Appendix A 2.0 PURPOSE OF STUDY The purpose of bench scale study is to evaluate the effects of infecting ozone into the aquifer materials on the mobilization of metals into solution GTI conducted the Pre-Bench Scale Study with the directives from CRWQCB-CV to determine if the full Bench Scale Testing is ' necessary before going to the pilot testing 3.0 SAMPLING PROCEDURE The soil samples were taken from Bench Scale Sampling (BSS-1, BSS-2) locations as shown in Figure 2 Water and soil samples were taken according to the following scheme 1