Fort George G. Meade Groundwater Contamination, Odenton, Maryland Interim Measures Update Restoration Advisory Board Meeting November 18,

Study Areas 2 1-mile radius surrounding monitoring wells MW- 125d/123s & MW-126d/124s located at the intersection of North Patuxent Road and Dovetail Lane, Odenton Nevada Ave, Odenton Old Dairy Farm Road, Gambrills

Interim Measures Progress Drinking water well survey outreach effort complete –USEPA concurrence received 17 September 2010 Drinking water well sampling completed for all interested properties (two rounds) Bottled water supply continues Nevada Avenue monthly sampling continues 3

Nevada Avenue Monthly Sampling - Interim Results 4 Month Dichloroethene (MCL - 70 μg/L) Tetrachloroethene (MCL - 5 μg/L) Trichloroethene (MCL - 5 μg/L) Toluene (MCL – 1,000 μg/L) Total Xylenes (MCL - 10,000 μg/L) mp-Xylene (No MCL) Detections / Samples Range ( μ g/L) Detections / Samples Range ( μ g/L) Detections / Samples Range ( μ g/L) Detections / Samples Range ( μ g/L) Detections / Samples Range ( μ g/L) Detections / Samples Range ( μ g/L) Oct 091/11.71/14.51/10.77J0/1--0/0--0/0-- Nov 093/ / /30.71J-0.84J0/3--0/0--0/0-- Dec 093/ K3/ /30.52J-0.68J0/3--0/0--0/0-- Jan 102/ / /2--0/3--0/0--0/0-- Feb 103/ / /30.57J/0.85J0/3--0/0--0/0-- Mar 103/31.2J-1.5J3/33.3J-4.3J3/30.48J-0.51J0/3--0/0--0/0-- Apr 103/ / /30.61J-0.68J0/3--0/0--0/0-- May 103/ / /3--0/3--0/0--0/0-- Jun 103/ / /30.57J-0.71J0/3--0/0--0/0-- Jul 103/ / /30.42J-0.7J1/32.00/0--0/0-- Aug 103/ / /30.53J1/30.49J0/0--0/0-- Sep 103/ / /30.42J-0.6J1/30.22J1/30.66J1/30.66J *Oct 103/30.82J-1.13/ /30.49J-0.51J0/3--0/3--0/3-- *Unvalidated data for the month of October 2010 Data Qualifiers: K = reported value may be biased high J= estimated concentration below the method detection limit

Next Steps Interim Measures Reporting –Internal Draft Interim Measures Report (Nov 2010) Nevada Avenue Investigation –Continue to sample private wells monthly –Work Plan Internal Draft submitted October 2010 Draft due December 2010 Draft Final due February 2011 Final due April 2011 –Field work (i.e., monitoring well installation & sampling) May

Points of Contact U.S. Army Garrison Fort George G. Meade Directorate of Public Works-Environmental Division 2212 Chisholm Avenue, Suite 5115 Fort Meade, Maryland Paul Fluck, PG, REP –Environmental Restoration Manager – Denise Tegtmeyer, PE –Senior Project Manager –