ARCHIVED REPORTS_FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT

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Stantec L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Groundwater Monitoring and Sampling January 31, 2011 thickness from 0.01 to 3.09 ft (February 2007; Table 3). Well MW-10 was abandoned in November 2008 due to the SRDA's excavation activities. Historical measurable thickness of SPH in wells DPE-1 through DPE-13 and MW-40 has ranged from 0.01 ft (DPE-12, February 2005) to a Site-wide shallow zone maximum thickness of 11.72 ft (DPE-1, November 2003). Well MW-40 was abandoned in November 2008 due to the SRDA's excavation activities. A summary of 4Q10 SPH thickness and SPH sheen in comparison to the 3Q10 is provided in the following table. 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 SPH removal activities are typically performed between quarterly monitoring events (as noted on the table), and are likely to influence reported SPH thickness. SPH SPH Well Thickness Thickness Difference Identification 3Q10 (Feet) I 4Q10 (Feet) (Feet) 2AMW-13 Sheen* Sheen* NA 2AMW-14 Sheen** Sheen NA MW-19 Sheen* Sheen* NA DPE-1 Sheen** Sheen NA DPE-2 Sheen** Sheen NA DPE-3 Sheen** Sheen NA DPE-4 Sheen** Sheen NA DPE-5 Sheen** Sheen NA DPE-6 Sheen** Sheen NA DPE-7 Sheen** Sheen NA DPE-8 Sheen** Sheen NA DPE-9 Sheen** Sheen NA DPE-10 Sheen** Sheen NA DPE-11 Sheen** Sheen NA DPE-12 Sheen** Sheen NA DPE-13 Sheen** Sheen NA Definitions: NA = Not applicable SPH = Separate phase hydrocarbon * = SPH removal occurred prior to groundwater sampling. ** = Connected to free product removals stem I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual QSSRQRSRQMR Stockton_F I NAL.doc 2.18