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U-Haul#709-50 Blaes Environmental Preliminary Site Conceptual Model December 15,2006 REMEDIAL FEASIBILITY TESTING—NOVEMBER 2002 On November 18th through the 21st, 2002, Blaes Environmental conducted remedial feasibility testing at the site Remedial feasibility testing included an Air Sparge (AS) and Vapor Extraction (VE) test, aquifer Pump testing, and sample collection for biofeasibility analysis The remedial tests were performed to evaluate the suitability of various remedial options For a detailed description of feasibility testing procedures conducted at the site, please refer to the Remedial Feasibility Test Report — U-Haul 709-50, dated February 28, 2003 The individual feasibility test results are summarized below Results of remedial testing will be utilized to prepare a remedial action plan (RAP) for approval by the SJC 4.5 AIR SPARGE TEST RESULTS Based on AS testing data, groundwater analytical results, and field observations, the effective AS ROI (intuitive estimation between induced pressure response and dissolved oxygen increases versus distance in the monitoring point wells) approached an estimated 20 foot radial distance from test well ASW-1 The ASWA test data was plotted on a well performance curve (pressure versus flow rate) and is presented as Figure 3 in Appendix N The estimated AS ROI for the site is presented in Figure 4 in Appendix N Based on the AS test results, a remedial system incorporating groundwater AS would likely be an effective treatment technology for the remediation of groundwater beneath the site 4 6 VAPOR EXTRACTION TEST RESULTS The induced vacuum and flow rate achieved from each VE test well was similar VE testing of VEW-1 during the fourth and final step of the test yielded a maximum flow rate of approximately 175 cfm at a corresponding vacuum of approximately 75 inches of water column Similarly, VE testing of VEW-2 during the fourth and final step yielded a maximum flow rate of approximately 170 cfm at a corresponding vacuum of approximately 77 inches of water column This equates to a vapor flow rate of approximately 8 75 cfm per linear foot of well screen in VEW-I and approximately 8 5 cfrn per linear foot of well screen in VEW-2 These values represent the maximum well performance achievable utilizing the test system's PD blower set up The well performance curves (induced vacuum versus flow rate) for extraction test wells VEW-I and VEW-2 are presented in Figure 5 in Appendix N Each monitoring point well demonstrated an effective vacuum response at their respective lateral point distances from the nested extraction wells Generally, a vacuum response of greater than 0 1 inches of water in a lateral monitoring point well is considered effective At the fourth and final step of each VE test, each monitoring point well demonstrated a vacuum response of greater than 0 10 inches of water Page 18