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Mr. Robert McClellon <br /> January 23,2014 <br /> Page 2 <br /> monitoring wells were installed at the site on June 12,2006.Following the installation of the ground- <br /> water monitoring wells,groundwater samples were collected quarterly and analyzed for VOCs.Mr.Ross <br /> Atkinson of the Regional Water Quality Control Board(RWQCB),Central Valley Region,requested <br /> that groundwater samples be collected and analyzed for metals and general minerals(only total dissolved <br /> solids [TDS] after the first event) starting in 4Q06. In a meeting on May 24,2007,Mr.Atkinson <br /> concurred with the recommendation in the Quarterly Monitoring Report dated April 30,2007,to suspend <br /> the groundwater monitoring activities for VOCs. <br /> In the IQ I letter report to SJCEHD dated April 29,2011,URS recommended reducing the frequency of <br /> the monitoring activities from quarterly to annually. SJCEHD agreed with URS' recommendation.The <br /> annual monitoring activities are usually conducted during the fourth quarter of each year. In a letter to <br /> RWQCB dated May 20,2011,URS recommended no further action for groundwater activities. RWQCB <br /> agreed that on-site groundwater issues had been resolved to their satisfaction and issued a letter to <br /> proceed with well decommissioning on December 2,2011.URS decommissioned the groundwater <br /> monitoring wells on December 9,2012. <br /> FIELD ACTIVITIES <br /> Annual Monitoring Activities <br /> On December 3,2013,URS measured landfill gas concentrations(i.e.methane,oxygen, and carbon <br /> dioxide)using a handheld portable gas monitor,a GEM 2000,within the gas migration monitoring <br /> probes(VW-1 though VW-10),extraction wells(EW-1 and EW-2),and passive vents(VP-1 through <br /> VP-4). URS recorded these measurements in the project logbook <br /> RESULTS <br /> The methane concentrations measured during the quarter were 0%in all gas-migration monitoring <br /> probes. Methane concentrations measured in the vapor extraction wells were 3.7%in EW-1 and 1.1%in <br /> EW-2. Methane concentrations measured in the passive vents were 1.0%in VP-1,2.8%in VP-2, 6.7%in <br /> VP-3,and 5.1%in VP-4. <br /> Oxygen concentrations measured at all sample locations during the quarter ranged from 0.0%to 20.7%. <br /> Carbon dioxide concentrations measured at all sample locations during the quarter ranged from 0.3%to <br /> 26.7%. <br /> Table 1 summarizes results for each probe each extraction well and each passive vent. <br /> H:\Wprocess\25532\WoddEnterpdse\Quartedy Rpt\2013\Text.doc <br />