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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> February 1, 2013 <br /> 2.7.2 Deep Zone <br /> The following sections summarize trends for detected petroleum hydrocarbons, fuel oxygenates, <br /> and observed SPH for deeper (B-, C-, and D-Zone) groundwater beneath the Site. <br /> 2.7.2.1 SPH <br /> A summary of 4Q12 SPH thickness and SPH sheen in comparison to the 3Q12 is provided in <br /> the following table. <br /> Well Identification SPH Thickness SPH Thickness Difference <br /> (Zone) 3Q12 (Feet)* 4Q12 (Feet)* (Feet) <br /> MW-17 (B) Sheen Sheen NA <br /> MW-43 (B) 0.20 0.35 + 0.15 <br /> MW-46 (B) Sheen Sheen NA <br /> MW-47 (B) 0.01 Sheen - 0.01 <br /> MW-48 B 0.03 Sheen - 0.03 <br /> MW-49 (B) 0.69 0.50 - 0.19 <br /> MW-50 B 28.28 30.70 + 2.42 <br /> MW-52 (B) Sheen Sheen NA <br /> Definitions: <br /> B = B-Zone wells <br /> NA = Not applicable/not available <br /> SPH = Separate phase hydrocarbon <br /> * = SPH removal occurred prior to groundwater sampling. <br /> SPH removal activities are scheduled to be conducted quarterly (at a minimum) for on and off <br /> Site wells which repeatedly contain measurable thickness of SPH or sheen. It should be noted <br /> that these SPH removal activities are typically performed between quarterly monitoring events <br /> (as noted on the table), and may influence reported SPH thickness. <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4012 and Annual QSSR QRSR QMR Stockton_FINAL.doc 2.15 <br />