"Table 5. Laboratory instrumentation and analytical details for chemical analysis of water samples from wells and multilevel samplers in the treated-wastewater plume, 1994-2004 (Repert and others, 2006)."		
		
Sample dates	Instrument used	Analytical details
		
Nitrate and Chloride		
1994	Alpkem Model RFA-300 flow-injection autoanalyzer	"Cadmium reduction and diazotization 
colorimetric method 
(Antweiler and others, 1996)"
1995 to 1999	Dionex Model DX300 ion chromatograph	"AS4A-4 mm column, 1.9 mN Na2CO3/
NaHCO3 mobile phase                                   (Smith and others, 2006)"
2000 to 2004	Dionex Model DX500 ion chromatograph	"AS15A-4 mm column, 34 mN NaOH mobile
phase (Smith and others, 2005)"
Nitrite		
1994 to 2004	Alpkem Model RFA-300 flow-injection autoanalyzer	"Diazotization colorimetric method 
(Antweiler and others, 1996)"
Ammonium		
1994	Alpkem Model RFA-300 flow-injection autoanalyzer	"Salicylate/nitroferricyanide colorimetric
method (Antweiler and others, 1996)"
1995 to 1999	Dionex Model DX100 ion chromatograph	"CS12A-4 mm column, 15 mN H2SO4 mobile
phase (Smith and others, in 2006)"
2000 to 2004	Dionex Model DX300 ion chromatograph	"CS12A-4 mm column, gradient elution of 5 to
25 mN H2SO4 mobile phase 
(Smith and others, 2005)"
Dissolved Organic Carbon		
1994 to 2004	"Oceanographic International
Model 700 carbon analyzer"	"Acidification and heated persulfate oxidation, 
infrared detection (Barber and others, 2001)"
1997 to 2004	"Seivers Model 800 carbon
analyzer"	"Acidification and ultraviolet light/ammonium
persulfate oxidation, conductivity detection 
(Barber, 2003)"
Dissolved Inorganic Carbon		
1994 to 1997	"Oceanographic International
Model 700 carbon analyzer"	"Acidification with infrared detection
(Barber and others, 2001)"
1997 to 1998	"Seivers Model 800 carbon
analyzer"	"Acidification with conductivity detection
(Barber, 2003)"
1998 to 2004	Field data	Calculated from pH and alkalinity
Inorganic Solutes		
1994 to 1999	Thermo-Jarrell Ash Model 61	"Inductively coupled plasma atomic emission 
spectroscopy (Coston  and others, 1998) "
2000 to 2004	Thermo-Electron Iris Dual View	"Inductively coupled plasma atomic emission 
spectroscopy (Savoie and others, 2004)"