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Solid Waste Management Unit B-28
Chronology of Actions/Investigations
|
Date |
Month |
Action/Results |
Action Performed By |
Project Number |
|
Unknown |
Unknown |
Small arms ammunition, metal ammunition parts, aerial flares, and molten metal were disposed of in two trenches on the site. |
CSSA |
NA |
|
1992 |
October |
Reviewed available records at CSSA during preliminary evaluation for groundwater contamination. |
Parsons ES |
Order 67 |
|
1995 |
February |
Performed EM geophysical survey on February 3. Found two geophysical anomalies potentially associated with waste management activities. |
Parsons ES |
Order 67 |
|
Performed GPR survey in northern trench on February 16. Provided strong response in area where metal was exposed on surface. |
Parsons ES |
Order 67 |
||
|
February - March |
Drilled six soil borings (SB1-6) and collected soil/rock samples between February and March. Chromium concentrates in limestone exceeded background levels in several samples. Phthalates were also detected in several samples. Results are summarized in Table B28-1. |
Parsons ES |
Order 67 |
|
|
March |
Collected groundwater sample from SB3 on March 1. None of the analytes exceed RRS2 standards. Results are summarized in Table2. |
Parsons ES |
Order 67 |
|
|
May |
Performed additional EM geophysical survey to verify data. |
Parsons ES |
Order 67 |
|
|
June |
Drilled two soil borings (SB1R-2R) on June 14 and 15. Collected soil/rock samples and analyzed for VOCs. None found. |
Parsons ES |
Order 67 |
|
|
Collected groundwater sample from SB1R on June 15 and analyzed for VOCs. None found. |
Parsons ES |
Order 67 |
||
|
June-July |
Performed soil gas survey between June 29 and July 19. Found PCE at concentrations less than 1 ug/L in samples. |
Parsons ES |
Order 67 |
|
|
1997 |
February |
Set up grid and performed magnetometer sweep at site on February 24 and 25. |
Parsons ES |
RL33 |
|
March - July |
Excavated trenches and sifted soil to remove scrap metal and UXO. Found small amounts of UXO in two trenches. |
Parsons ES |
RL33 |
|
|
June |
Work Plan for B-28 Investigation submitted. |
Parsons ES |
RL17 |
|
|
June |
Collected sample of sifted soil on June 19. Analytical results are in question due to ITS Laboratory practices. |
Parsons ES |
RL33 |
|
|
1999 |
January |
Addendum to Work Plan for interim measures submitted. |
Parsons ES |
RL74 |
|
April |
EPA memorandum indicated analytical results obtained from ITS are not usable. |
EPA |
NA |
|
|
November |
Submitted work plan for resampling to replace analytical chemistry data generated by ITS Laboratory. |
Parsons ES |
NA |
|
|
2000 |
April |
Collected 1 sift sample (Sift 6) for Rework, analyzed for metals and explosives. |
Parsons ES |
Rework |
|
Collected 3 sift samples (Sift 3-5) for metals and explosives analysis (1 sample) and metals analysis only (2 samples). |
Parsons ES |
RL83 |
||
|
2004 |
October |
Treated existing soil stockpile with phosphate. |
Parsons |
TO19 |
|
January |
Waste characterization samples collected from 800 to 1100 cy of phosphate treated soils. |
Parsons |
TO19 |
|
|
February |
Disposed of 595 cu. yds. of phosphate treated soils. |
Parsons |
TO19 |
|
|
May |
Collected 15 surface soil samples. |
Parsons |
TO19 |
|
|
2010 |
June |
Performed XRF analysis at the site to determine the extent of metals in surface soils. |
Parsons |
DO50 |
|
November |
Collected 37 surface soil samples on-site, collected 3 additional soil samples north of site, put erosion control in place, and began excavation. |
Parsons |
NA |
|
|
December |
Continued excavation, XRF used to verify vertical excavation, confirmation samples collected from excavation sides and bottom. |
Parsons |
NA |
|
|
2011 |
February |
Additional excavation performed at select locations, confirmation soil samples collected. |
Parsons |
NA |
|
August |
Release Investigation Report submitted to TCEQ. |
Parsons |
NA |
|
|
November |
TCEQ |
NA |