The December 2003 results are those upon which a risk assessment was based and upon which it was concluded in a ROD for the site that chemicals of concern (COCs) were not identified in groundwater.

 Groundwater samples were collected from a newly installed monitoring well and from selected monitoring wells for analysis of total TAL metals and explosives. Selected wells were those that could be located, that

were not damaged and/or that

did not require UXO clearance to access them in the November 2009 sampling round. Samples were collected using

low-flow sampling methods.  Exceedances of the respective levels of concern (LOC) for the following metals were reported:  aluminum (10 wells), arsenic (all 15 wells), lead (1 well), manganese (14 wells), and iron (13 wells).  No explosives were reported.  Arcadis noted that all of the detections during the 2009/2010 sampling were

below those previously

reported in 2003 - with the exception of manganese.  Therefore, Arcadis concluded that the “results are consistent with the prior understanding of site conditions and it

appears that on-going site operations are not negatively impacting groundwater quality.”  Arcadis also concluded that the findings and conclusions of the risk assessment and of the Record of Decision were still valid.

.

Image Courtesy of Arcadis : Figure 1 Site Map of the Monitoring Well Installation, Groundwater Sampling and

Analysis Report for Site 34 Report dated 10/22/2010