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' Stantec <br /> L & M OPERABLE UNIT-THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> ' October 27, 2010 <br /> depth to water/SPH and SPH thickness are apparent in several of these wells from quarter to <br /> quarter. This may also be attributed to seasonal fluctuations in groundwater levels. <br /> SPH or sheen has historically been reported in well 2AMW-14 since May 2002 (Table 3, <br /> Figure 9). Historical thickness of SPH in that well has ranged from 0.02 ft reported during the <br /> first quarter 2005 to a maximum thickness of 2.99 ft reported during the fourth quarter 2003. <br /> Well 2AMW-14 was not assessed during the third through fourth quarters of 2004 due to its <br /> ' connection to a free product removal system. However, well 2AMW-14 has been accessible for <br /> the last 22 consecutive quarters and has contained sheen only for the last quarters. SPH or <br /> sheen has historically been reported in well MW-10 since February 2004 and has ranged in <br /> thickness from 0.01 to 3.09 ft (February 2007; Table 3). Well MW-10 was abandoned in <br /> ' November 2008 due to the RDA's excavation activities. <br /> Historical measurable thickness of SPH in wells DPE-1 through DPE-13 and MW-40 has ranged <br /> ' from 0.01 ft (DPE-12, February 2005) to a Site-wide shallow zone maximum thickness of 11.72 <br /> ft (DPE-1, November 2003). Well MW-40 was abandoned in November 2008 due to the RDA's <br /> excavation activities. <br /> ' A summary of third quarter 2010 SPH thickness and SPH sheen in comparison to the <br /> first quarter of 2010 is provided in the following table. <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. It should be noted that these <br /> SPH removal activities are typically performed between quarterly monitoring events (as noted <br /> on the table), and are likely to influence reported SPH thickness. <br /> ' 1:MdomteffW Stockton(Parcel MA 415)\ReportskQMR@010UQ10UQ10QSSRQRSRQMR Stockton FINN .doo 2.19 <br />