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TABLE 2-1 Summary of Groundwater Levels,Field Parameters,and Laboratory Data Monitoring Well Destruction Work Plan,Koppel Stockton Terminal,Stockton,California Field Data' Laboratory Data Groundwater Groundwater Redox Sample Depth Elevation conductivity Potential DO TDSa Ammonia-N Nitrate-N TKNa Well Date (feet below TOC)` (feet ms]) [VS/cm) pH (mV) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) Comments KP-6D 8/19/2008 11.47 -6.45 2,651 7.28 108 1.83 -- 1.5 109 -- 8/19/2009 11.64 -6.62 2,641 7.17 91 2.13 -- 0.731 86.31 -- • 10/12/2010 10.94 -5.98 2,343 7.06 141 1.22 -- 0.13 25.3 -- 10/12/2010 -- -- -- -- -- -- -- 0.14 26.4 -- Field Duplicate Sample 3/4/2011' 7.89 -2.93 - -- -- -- - -- -- 8/11/2011 9.50 -4.54 2,042 7.35 154 0.48 -- 0.18 0.17 -- 8/11/2011 -- -- -- -- -- -- -- 0.074 0.18 Field Duplicate Sample 8/7/2012 10.09 -5.13 1,831 7.59 42 0.18 -- 0.11 c0.11 -- 8/12/2013 10.37 -5.41 1,827 7.48 130 0.34 -- 0.041 X0.11 -- 'Monitoring well sampling conducted by Sierra Environmental Sampling,Camino,California. s Laboratory analyses conducted by Columbia Analytical Services,Redding,California,until 2006.Data collected from 2007 on was analyzed at TestAmerica in Sacramento,California. `For consistency,depth to groundwater is reported relative to the current TOC elevation. TKN and TDS were removed from the analyte list for this Site as of first quarter 2000 under approval from the Water Board. 'Cleanup goals for groundwater as established by the Remedial Action Pion(CH2M HILL,2000). r Redox potential is shown for monitoring events performed during and after first quarter 2000 only. s DO content was assumed to be zero because of a negative value measured in field. • "Samples were not collected from the monitoring well because the well was damaged or not accessible. Notes: -- = not measured 11S/cm = microsiemens per centimeter DO = dissolved oxygen 1 = the reported value is estimated because the value is less than the reporting limit but greater than or equal to the method detection limit,the holding time was exceeded during laboratory analysis,or because of quality issues(e.g.,sample was received by laboratory at greater than 4 degrees Celsius) UJ = the reported value was not detected;however,the result is estimated because of quality control exceedances msl = mean sea level my = millivolt redox = oxidation reduction TOC = top of casing RDD/140100001(NLH4947o0Cx) 2-6 ESlMI311472ORDD