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1 <br /> Ms. Kristin Shelton <br /> ' Page 8 of 10 <br /> ' PROGRESS & EFFECTIVENESS OF REMEDIATION <br /> Effectiveness of Remediation <br /> During the year 2015 a measurable thickness of free floating hydrocarbon product was present in <br /> well MW6R during the third quarter and a measurable thickness of free floating hydrocarbon <br /> ' product was present in well MW9R during the first, second, third and fourth quarters. The <br /> hydrocarbon recovery skimmer did not operate in MW8 during 2015; it was previously removed <br /> pending an increase in product thickness. Approximately 0.5 gallons of free product/water <br /> mixture was bailed from MW6R during the year 2015 and approximately 131 gallons have been <br /> bailed since October 2007. No free product/water mixture was present or removed from well <br /> ' MW8 during 2015. Approximately 946 gallons have been bailed from MW8 since 1994. <br /> Approximately 8.0 gallons of product/water mixture were removed by bailing from well MW9R <br /> during the year 2015 and approximately 524 gallons have been bailed since October 2003. Well <br /> ' VEW 1-D was utilized for soil vapor extraction during the year 2015 and was not monitored for <br /> free product. Approximately 125 gallons have been bailed from VEWl-D since June 2010. <br /> Ground Zero will continue to monitor and manually recover free hydrocarbon product as <br /> ' appropriate. <br /> The SVE system was installed and put into operation during the third quarter of 2012 and the <br /> ' system ran intermittently during the fourth quarter of 2012. During 2013 the SVE system was <br /> down for repairs during the majority of the first two quarters of the year. The heating elements <br /> were replaced and the system was restarted in early May 2013 and ran for the remainder of 2013, <br /> ' only occasionally going down for minor repairs. The system was down when monitored in early <br /> January 2014. The system remained non-operational from January 3 to December 12, 2014, <br /> when a new heating element was fabricated and installed and the system was restarted. The <br /> ' system ran without incident through 2015, with the only alteration being the system was <br /> modified in early-April 2015 to extract only from extraction well VEWI-D, as a targeted effort <br /> to eliminate the presence of free floating hydrocarbon product from the site. During the year <br /> ' 2015 the SVE system operated for approximately 8,750 hours, extracting hydrocarbon vapor <br /> from extraction wells VEWl-SND from January to early-April and only from VEW1-D from <br /> early-April through December 2015, at an average rate of 85 cubic feet per minute (cfm). <br /> ' Influent vapor samples collected from the SVE system in January and March 2015 indicated the <br /> presence of low to moderate concentrations of TPHg, BTEX compounds and MTBE in the <br /> extracted vapor stream. After the system was modified to extract only from well VEWI-D <br /> influent vapor samples collected from the SVE system in April, May, June, July, August, <br /> September, October, November and December 2015 indicated the presence moderate to high <br /> concentrations of TPHg, BTEX compounds and MTBE in the extracted vapor stream. To date, <br /> ' the SVE system has operated for approximately 16,560 hours and has removed approximately <br /> 15,770 pounds of hydrocarbons from the subsurface. The current hydrocarbon removal rate is <br /> approximately 16 pounds per day. <br /> 1 <br /> 0:\Dam\GROUNDZE\WOOLSEY.ROB\Repom\QMR\2015 QMRAANNUAL REPOR71Fnal Teztjw.doc <br />