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L & M OPERABLE UNIT-THIRD QUARTER 2014 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> October 31, 2014 <br /> apparent in several of these wells from quarter to quarter. This may also be attributed <br /> 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 well 2AMW-14 has ranged from 0.02 ft reported <br /> during the first quarter 2005 to a maximum thickness of 2.99 ft reported during the fourth <br /> quarter 2003. Well 2AMW-14 was not assessed during the third through fourth quarters <br /> of 2004 due to its connection to a free product removal system. Recently, 2AMW-14 <br /> has contained sheen only. SPH or sheen has historically been reported in well MW-10 <br /> since February 2004 and has ranged in thickness from 0.01 to 3.09 ft (February 2007; <br /> Table 3). Well MW-10 was abandoned in November 2008 due to the City of Stockton's <br /> excavation activities. <br /> Historical thickness of SPH in wells DPE-1 through DPE-13 and MW-40 has ranged from <br /> 0.01 ft (DPE-12, February 2005) to a shallow zone maximum thickness of 11.72 ft (DPE-1, <br /> November 2003). Well MW-40 was abandoned in November 2008 due to the City of <br /> Stockton's excavation activities. <br /> A summary of 3Q14 SPH sheen in comparison to the 2Q14 is provided in the following <br /> table. <br /> Well SPH Thickness SPH Thickness Difference <br /> Identification 2Q14 (Feet) 3Q14 (Feet) Feet <br /> 2AMW-13 Sheen Sheen NA <br /> 2AMW-14 Sheen** Sheen** NA <br /> MW-19 Sheen Sheen NA <br /> Definitions: <br /> NA = Not applicable <br /> SPH = Separate phase hydrocarbon <br /> ** = Connected to free product removal system; although <br /> system has been turned off since October 2013. <br /> SPH removal activities were historically conducted quarterly (at a minimum) for on- and <br /> off- Site wells which repeatedly contain measurable thickness of SPH and are not <br /> connected to a remediation system. It should be noted that these SPH removal <br /> activities were typically performed between quarterly monitoring events, and were <br /> likely to influence historical reported SPH thickness. Due to the installation of the new <br /> free product removal system (April through May 2013) on the Waterfront Towers Parking <br /> lot facility, quarterly SPH removal has ceased, effective 1Q13. This system is currently <br /> active. For the wells that are not connected to a free product removal system and that <br /> have a light sheen, Stantec is currently executing the use of Soakies ® socks where <br /> necessary. <br /> 5ta ntec 2.14 <br />