Search for Campus Perchlorate Source Resumes Over Intersession

A total of 15 soil borings and co-located groundwater samples are proposed to further characterize the perchlorate source on the AU campus. All discrete soil samples and groundwater samples will be analyzed for perchlorate. Most of these borings are currently situated between PZ-4 [at Kreeger Hall] and upgradient shallow wells [near Watkins and Hamilton] ... USACE confirmed that late spring is the preferable season for sampling first water due to rainfall flushing through the soil, in contrast to the dry summer season. The ideal time frame for AU is in late spring 2011, between completion of the spring semester and the beginning of summer classes [May 9 - 30] ...

"SA" designates locations of temporary perchlorate wells

USACE requested feedback from AU regarding potential geophysical surveys and subsequent intrusive investigation in front of Kreeger Hall on the AU campus for the purpose of investigating a 1918 ground scar. This ground scar may be a shadow on the 1918 aerial photograph and received little attention early during the Spring Valley project, but someone from EPA subsequently described this ground scar as a probable ‘T’ [trench]. This ground scar is also located adjacent to elevated perchlorate detections at PZ-4.
Spring Valley Partnering Meeting
January 25, 2011 (pgs. 5, 10 & 26)