ARCHIVED REPORTS_1ST QUARTER 2008 SITE STATUS REMEDIAL SUMMARY AND GROUNDWATER MONITORING REPORT

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S E C O R • SPH or sheen has historically been reported in well 2AMW-14 since May 2002 (Table 3, Figure 9). Historical thickness of SPH in that well has ranged from 0.21 feet reported during the initial monitoring event in May 2002 to a maximum thickness of 2.99 feet reported during the fourth quarter 2003. As discussed above, well 2AMW-14 was not assessed during the first through fourth quarters of 2004 due to its connection to a free product removal system. However, well 2AMW-14 has been accessible for the last 13 consecutive quarters. SPH or sheen has historically been reported in well MW-10 since February 2004 and has ranged in thickness from 0.01 to 3.09 feet (February 2007; Table 3). Historical measurable thickness of SPH in well MW-21, DPE wells DPE-1, DPE-2, DPE-3, DPE-4, DPE-6, DPE-7, DPE-8, and DPE-10 has ranged from 0.01 feet (DPE-12, February 2005) to a Site-wide maximum thickness of 11.72 feet(DPE-1, November 2003). A summary of first quarter 2008 SPH thickness and SPH sheen in comparison to the fourth quarter of 2007 is provided in the following table. SPH SPH Well Thickness Thickness Difference Identification 4Q07 (Feet) 1Q08 (Feet) Feet MW-10 Sheen Sheen 'NA 2AMW-13 ND Sheen "NA 2AMW-14 Sheen Sheen NA • MW-19 NA Sheen 'NA DPE-1 Sheen Sheen NA DPE-2 Sheen Sheen NA DPE-3 ND Sheen NA DPE-4 0.08 0.30 +0.22 DPE-5 Sheen Sheen NA DPE-6 Sheen 0.30 NA DPE-7 Sheen Sheen NA DPE-8 0.01 0.02 +0.01 DPE-9 Sheen Sheen NA DPE-10 Sheen Sheen NA DPE-11 Sheen Sheen NA DPE-12 ND 0.05 NA DPE-13 NA Sheen NA Definitions: NA = Not Applicable/Not Available ND = SPH or sheen not observed = SPH Removal occurred prior to groundwater sampling. SPH removal activities are scheduled to be conducted quarterly (at a minimum) for on and off • Site wells which repeatedly contain measurable thickness of SPH. It should be noted that these 1Q08QSSRQRSRQMR.F1na1.doc 21 April 30,2008 77TW.26397.42.1307