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2.10 IgWe of faroundwater Mol dtori ng Well Chemical Analyses Results <br /> Historic groundwater monitoring well chemical analyses are provided in the attached <br /> Table 7; Groundwater Chemical Results, Well MWWES-1. Data is attached with the <br /> historic groundwater monitoring data(see Table. 8). <br /> 2,11Discussion of Cquegntratims and Moss Changes Remining in!Uroundwater <br /> The groundwater plume area and dissolved concentrations have diminished from 2003 to <br /> 2010. The currently mapped plume data is presented in Wright quarterlytrionitoring <br /> report for the third quarter 2010. The highest observed historic concentrations observed <br /> are presented in. the following Surnmary Table with the latest 2010 monitoring (see also <br /> Tables 2 through 8). <br /> Summary Table of Higli Groundwater Concentrations and <br /> Current(as of September 9,2010) Groundwater Concentrations <br /> Contaminant EIA 8-2 8.3 8-4 8-5 B-6 13-7 8.6 B-9 WES WES <br /> Date 2114 2/14 2114 2114 10/20 10128 10128 10128 10128 MW-1 MW-11 <br /> Sampled 103 103 M 103 108 /08 108 M 108 I0122 9/9 <br /> '(09 110 <br /> UQ/l UA U211 UCIII YAIF U0 Un Un Un U0 UA <br /> I <br /> TPHG NO NO ND NO KA NA NA NA NA NO NO <br /> <so <50 <5Q 1450 <60 <50 <br /> TPHD 810 33.000 660 660 490 170 300 120 200 51 NO <br /> <50 <br /> Benzene NO NO ND NO NA NA NA NA NA NO NO <br /> <05 <0.5 <0.6 <0.5 140.5 140.5 <br /> Toluene NO NO NO NO NA NA NA NA NA NO NO <br /> <01'5 140.5 <0.5 140.5 140.5 ¢O.5 <br /> Ethyl NO NO NO NO NA NA NA NA NA NO NO <br /> benzene <0.5 <0.6 <0-5 <0.5 <0.5 144.5 <br /> Xylenes NO NO NO NO MA NA NA NA NA NO NO <br /> <0.5 I <0.5 1 40.5 a*,5 40.5 <05 <br /> -[� <br /> MTBE NO I NO I NO NO MA NA NA NA NA NA NA <br /> <05 <0.5 <0.,5 I <0.5 <br /> Note: U0—Microg nuns per liter.See Historic Data Table for compiled results for all wells. ND—None <br /> deter-ted NA — Not Analyzed, TPHG-Tolal Pctrolcum Hydrocarbons, Gasoline, or TPHD - Diesel. <br /> MTBE,Mc thy]-tcrt-Butyl-FAher. After review of 2003 data with EHD, only diesel was analyzed in the <br /> 2008 study. <br /> The tank removal in 1998 removed the UST contaminant source. TPHD was not <br /> detected during the latest groundwater monitoring event (see discussion below). An <br /> estimate of the remaining dissolved contaminant was made using the 2009 and 2010 <br /> monitoring data, TPHG,TPHD and BTEX have not been reported in groundwater at the <br /> latest 2010 monitoring collected from this site. <br /> 48891CSR/Rept Page 7 of 17 <br />