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[SWMU O-1]
Solid Waste Management Unit O-1
Chronology of Actions/Investigations
|
Year |
Month |
Action/Results |
Action Performed By |
Project Number |
|
1975 |
Unknown |
Oxidation pond constructed using a vinyl plastic liner with a life expectancy of 10 years. Waste liquids and sludges from bluing operation were placed in the pond. |
CSSA |
NA |
|
1984 |
April |
Liquid and sludge sample collected from surface of pond at the request of the Texas Department of Health and taken to Brooks AFB on 20 April for evaluation. Sample was tested for metals. |
TDH Brooks AFB |
NA |
|
1985 |
Unknown |
RRAD recommended procedure for closure of pond. Pond was filled with dirt in the fall of 1985. |
RRAD |
NA |
|
1992 |
October |
Records at CSSA reviewed during preliminary evaluation for groundwater contamination. |
Parsons ES |
Order 71 |
|
1995 |
February |
EM geophysical survey performed on February 2; one anomaly found. GPR geophysical survey performed on February 15. |
Parsons ES |
Order 67 |
|
March |
Two surface water samples collected on 3 March and analyzed for VOCs; toluene found in one sample. |
Parsons ES Chemron |
Order 67 |
|
|
March |
One surface water sample collected on 7 March and analyzed by the AL/OEB laboratory; no VOCs found in sample. |
Parsons ES AL/OEB |
Order 67 |
|
|
March |
Four soil borings (SB1-4) drilled on 14-16 March. Soil/rock samples collected on 14-16 March; VOCs found in two samples, and chromium and cadmium found in all samples. |
Parsons ES JEDI Chemron |
RL17 |
|
|
June |
First phase of soil-gas survey performed in area of geophysical anomaly on 24-27 June; PCE found in soil-gas samples. |
Parsons ES |
Order 67 |
|
|
October |
Technical presentation given on 19-20 October on groundwater investigation and source characterization actions. |
CSSA EPA TNRCC AFCEE AL/OEB Parsons ES |
Orders 67 and 126 |
|
|
November |
Additional surface soil sampling performed near SB2 on 15 November; PCE, chromium, and cadmium found above risk reduction standard 2 (RRS2) criteria. |
Parsons ES Chemron |
Order 67 |
|
November |
Five-gallon soil material sample collected for benchscale soil washing test; test performed by EET of Austin. |
Parsons ES EET |
Order 67 |
|
|
November |
Began second phase of soil gas survey on 20 November. |
Parsons ES |
Order 67 |
|
|
December |
Completed second phase of soil gas survey on 5 December; PCE found in soil gas samples collected 20 November - 5 December. |
Parsons ES |
Order 67 |
|
|
December |
Meeting conducted on 7 December to discuss further investigation of site, including liner investigation and benchscale testing of VOC volatilization from soils. |
CSSA AL/OEB AFCEE Parsons ES |
Order 67 |
|
|
1996 |
January |
Soil material excavation down to bedrock limestone began on 8 January for the liner integrity investigation (January-April 96). Soil samples collected from excavation and bermed soil laydown area on 8 January; PCE and chromium found in samples. Composite soil samples collected from bermed soil laydown area on 30 January; chromium found in one sample. Analytical results are in currently question due to ITS Laboratories. |
AL/OEB Parsons ES ITS |
Order 67 |
|
March |
Composite soil samples collected from bermed soil laydown area on 14 March; chromium found in one sample and PCE (<1.0 mg/kg) found in both samples. |
Parsons ES ITS |
Order 67 |
|
|
April |
Soil samples collected from walls and bottom of excavated area on 11 April. Soils within bermed laydown area placed with original excavated soils. Liner samples collected from beneath former bermed laydown area and excavated area on 16 April; liner material classified as nonhazardous waste. |
Parsons ES ITS |
Order 67 |
|
|
August |
Additional soil gas survey performed at the site. |
Parsons ES |
Order 67 |
|
September |
Surface soils sampled for hexavalent chromium (Cr(VI)) content on 4 September; no Cr(VI) found in samples. |
Parsons ES |
RL17 |
|
|
April |
CSSA personnel began excavating three trenches on 11 April during initial investigation for locating field pilot scale test unit in electrokinetic treatability study. |
CSSA Parsons ES |
RL17 |
|
|
April |
Soil samples collected from trench along southeast wall of excavated area on 11 April; chromium, cadmium, lead, and zinc found in samples. |
Parsons ES ITS |
RL17 |
|
|
April |
Lynntech submitted work plan for O-1 treatability study on 28 April. |
Lynntech |
RL17 |
|
|
1997 |
May |
Surface soil samples collected from each trench on 9 May for laboratory benchscale test in electrokinetics treatability study. |
Parsons ES Lynntech |
RL17 |
|
June |
Lynntech submitted revised work plan for O-1 treatability study on 10 June. |
Lynntech |
RL17 |
|
|
July |
Drilling and electrokinetic well construction activities for field pilot scale test began on 7 July. Soil samples collected from electrode wells on 8 July to establish baseline VOCs and metals contaminant concentrations and to determine extent of contamination at the site. |
Parsons ES Lynntech |
RL17 |
|
|
August |
Drilling and electrokinetic well construction activities for field pilot scale test completed on 17 August. |
Parsons ES Lynntech |
RL17 |
|
|
September |
Additional soil samples collected from electrode wells on 25 September for field pilot scale test. |
Parsons ES Lynntech |
RL17 |
|
|
November |
Additional soil samples collected from electrode wells on 6 November for field pilot scale test. |
Parsons ES Lynntech |
RL17 |
|
|
1998 |
January |
Final round of soil samples collected from electrode wells on 6-9 January for field pilot scale test. |
Parsons ES Lynntech |
RL17 |
|
March |
Lynntech submitted final technical report for O-1 Treatability Study on 25 March. |
Lynntech |
RL17 |
|
|
June |
Electrokinetics treatability study data evaluation and reporting performed June-December 98. |
Parsons ES Lynntech |
RL17 |
|
September |
Surface soils sampled for hexavalent chromium (Cr(VI)) content on 4 September; no Cr(VI) found in samples. |
Parsons ES |
RL17 |
|
|
July |
Lynntech submitted revised final technical report for O-1 Treatability Study on 24 July. |
Lynntech |
RL17 |
|
|
December |
Electrokinetics treatability study data evaluation and reporting completed. |
Parsons ES Lynntech |
RL17 |
|
|
December |
Draft Electrokinetics Treatability Study report submitted on 4 December. |
Parsons ES |
RL17 |
|
|
1999 |
April |
EPA memorandum indicated analytical results obtained from ITS are not usable. |
EPA |
NA |
|
April |
The Final Electrokinetics Treatability Study report was submitted on 30 April. |
Parsons ES |
RL17 |
|
|
November |
Submitted work plan for resampling to replace analytical chemistry data generated by ITS Laboratory. Advanced 20 soil borings (SB5-24) and collected 25 soil/rock samples for cadmium, chromium, PCE, 1,2-DCE, TCE, Vinyl Chloride, toluene and m,p-xylenes analysis. |
Parsons ES Parsons ES O’Brien & Gere JEDI |
RL74 |
|
|
2000 |
April |
Advanced 5 soil borings (SB25-29) and collected 5 soil/rock samples for cadmium, chromium, PCE, 1,2-DCE, TCE, Vinyl Chloride, toluene and m,p-xylenes analysis. |
Parsons ES O’Brien & Gere JEDI |
RL74 |
|
July |
Advanced one soil borings (SB30) and collected a rock samples for cadmium, chromium, PCE, 1,2-DCE, TCE, vinyl chloride, toluene and m,p-xylenes analyses. |
Parsons ES O’Brien & Gere JEDI |
RL74 |
|
|
July |
Contaminated soils (approximately 1,515 cubic yards) were excvated and disposed at Covel Gardens Landfill. The area of excavation measured approximately 7,000 square feet by 5 feet deep. Excavated area was back-filled with clay-rich soil and a 2-foot thick low-permeability clay liner was constructed over the site. |
Parsons ES Eagle |
RL74 |
|
|
October |
Interim/Stabilization Measures and Partial Facility Closure Report submitted to EPA and TNRCC. |
Parsons ES |
RL74 |
|
|
2001 |
December |
TNRCC reviewed Interim/Stabilization Measures and Partial Facility Closure Report. |
TNRCC |
NA |
|
2002 |
April |
TNRCC letter approving SWMU O-1 closure for surface soils only. |
TNRCC |
NA |