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L & M OPERABLE UNIT-THIRD QUARTER 2013 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> November 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 3Q13 SPH thickness and SPH sheen in comparison to the 2Q13 is provided in <br /> the following table. <br /> Well Identification SPH Thickness SPH Thickness Difference <br /> (Zone) 2Q13 (Feet) 3Q13 (Feet) (Feet) <br /> MW-17 (B) Sheen Sheen NA <br /> MW-43 B 0.40 0.40 0 <br /> MW-46 B Sheen Sheen NA <br /> MW-47 B Sheen Sheen NA <br /> MW-48 B Sheen Sheen NA <br /> MW-49 (B) 5.34 4.73 - 0.61 <br /> MW-50 B 31.59 31.20 - 0.39 <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 activities are conducted quarterly (at a minimum) for on and off Site wells which <br /> repeatedly contain measurable thickness of SPH or sheen. It should be noted that these SPH <br /> removal activities are typically performed between quarterly monitoring events (as noted on the <br /> table), and may have influenced reported SPH thickness. SPH removal activities did not take <br /> place 3Q13 as described above in Section 2.7.1.1. <br /> 2.7.2.2 Fuel Oxygenates and Hydrocarbon Concentrations <br /> A summary of 3Q13 deep (B-, C-, and D-Zone) concentration trends of TPHg, TPHd, TPHo, <br /> benzene, MTBE, and TBA in comparison to results reported during the previous quarter are <br /> presented in the following table. Values in parentheses represent number of detections that <br /> were reported in 2Q13. <br /> 5tantec 2.14 <br />