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[AOC 36]
Area of Concern 36
Chronology of Actions/Investigations
|
Year |
Month |
Action/Results |
Action Performed By |
Project Number |
|
1942 |
Unknown |
155-millimeter shells containing mustard gas were buried and detonated at CSSA. |
CSSA |
NA |
|
1958 |
May |
Conducted field efforts to assist in detection and disposal of any remaining shells on 15 May. Decontamination of possible residual mustard was conducted using calcium hypochlorite (bleach). |
U.S. Army Chemical Corps Technical Escort Unit |
NA |
|
On May 23, the Technical Escort Unit head signed certificate stating that all 155-mm mustard filled rounds and resultant scrap metal buried in July 1942 were recovered, destroyed, and decontaminated. |
H.J. Young, Jr., 1st Lt., Cml |
NA
|
||
|
1992-1993 |
NA |
Review of 1957 and 1962 aerial photographs. |
Parsons ES |
Order 71 |
|
1995 |
May |
EM geophysical surveys performed; no anomalies found. |
Parsons ES |
Order 67 |
|
June - July
|
Twenty-nine soil-gas survey samples collected and analyzed for chlorinated and aromatic volatile organics. PCE, TCE, and DCE were detected. |
Parsons ES |
Order 67 |
|
|
November- December |
Additional 10 soil-gas survey samples were collected. Carbon tetrachloride, as well as previously identified constituents, were detected. |
Parsons ES |
Order 67 |
|
|
1997 |
February |
Site identified as a mustard gas burial site identified on 1942 map of CSSA surveyed on February 18. An area of approximately one acre was marked for more investigation. |
Baker Surveying |
RL33 |
|
Two former CSSA personnel interviewed. Interviewees pointed out the general vicinity within which the mustard gas shells had been buried. |
CSSA |
RL33
|
||
|
Forester Ferex (Mk-26) magnetometer sweep of surveyed areas and area identified by former CSSA personnel on February 26. Metal items determined to be free of explosives were placed in a roll-off container for recycling. UXO items were segregated for later disposal. |
Parsons ES
|
RL33 |
||
|
June |
Areas with noted anomalies were excavated June 1997, each anomaly identified during the magnetometer survey was excavated to determine if it was buried UXO or mustard gas shells. Excavated soils were sifted. No mustard gas shells or evidence of mustard gas shells were identified throughout the site. Throughout the excavation activities, Schonstadt GA-52B Locators were used to verify removal of anomalies. |
Parsons ES |
RL33 |
|
|
1999 |
March |
Investigation report submitted to TNRCC. Permission to close site requested. |
Parsons ES |
RL33 |
|
July
|
TNRCC granted permission to close the site. |
TNRCC
|
NA
|
|
|
2000 |
January |
10 surface samples were collected throughout the AOC, and were biased towards those locations which exhibited elevated levels of chlorinated hydrocarbons during the 1995 soil gas survey. Samples were analyzed for PCE, TCE, and DCE-isomers only. No contaminants were detected in any of the surface samples submitted. |
Parsons ES |
DO5068 |
|
2002 |
May |
Parsons |
DO 5068 |
|
|
August |
TCEQ |
NA |