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[AOC 35]
Area of Concern 35
Chronology of Actions/Investigations
|
Year |
Month |
Action/Results |
Action Performed By |
Project Number |
|
1995 |
February |
Site included in the seven potential source areas around well 16 for which EM and GPR geophysical surveys were performed. Overall, sixteen anomalies were found. |
Parsons ES |
Order 67 |
|
May |
Increased area of EM geophysical surveys to approximately ½-mile radius around well 16; no anomalies found. |
Parsons ES |
Order 67 |
|
|
June-July |
Twenty-one soil-gas survey samples collected and analyzed for chlorinated and aromatic volatile organics. PCE was the only target analyte detected. |
Parsons ES |
Order 67 |
|
|
August - September |
Surface geologic mapping across CSSA and analysis of geophysical logs from water wells at and around CSSA. Mapped two distinct fault zones, one near well 16 and one north of well 1. |
Parsons ES |
Order 67 |
|
|
1996 |
January |
Ground penetrating radar surveys performed around CSSA by Dr. Young. Seismic reflection survey from well 16 southeast to well 1 by Blackhawk Geosciences. |
Parsons ES |
Order 67 |
|
1999 |
December |
Performed geophysical surveying using EM and GPR. No anomalies associated with waste management practices were found. |
Parsons ES |
DO5068 |
|
2001 |
April |
Surface soil samples collected and analyzed for VOCs (PCE, TCE, DCE-isomers, carbon tetrachloride, and chloroform), AOC35-SS01 through AOC35-SS05 collected. |
Parsons O'Brian & Gere |
DO 5068 |
|
2002 |
October |
Parsons |
DO 5068 |
|
|
2003 |
February |
TCEQ |
DO 5068 |