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Solid Waste Management Units B-20 and B-21
Chronology of Actions/Investigations
|
Year |
Month |
Action/Results |
Action Performed By |
Project Number |
|
1946- 1987 |
NA |
B-20 area (approximately 33.5 acres) was used periodically for ordnance OB/OD activities. On an unknown date, sand and spent ammunition from the practice firing building at CSSA were disposed of at the B-21 area, which is immediately adjacent to B-20. |
CSSA |
NA |
|
1993 |
June |
A Compliance Order was issued for the B-20 site for unpermitted treatment of hazardous waste and for failure to have a closure plan. |
EPA |
NA |
|
1994 |
January |
Preliminary samples were collected from the B-20 area to provide an estimation of the nature and extent of contamination for environmental investigation planning purposes. |
RRAD |
NA |
|
March |
Partial Facility Closure Plan for B-20 (ES, 1994) closure/remedial investigation was submitted to EPA Region VI and TNRCC. |
Parsons ES |
Order 126 |
|
|
November - December |
First phase of closure/remedial investigation was conducted at B-20. UXO was cleared from within the original site boundary, and geophysical surveys were conducted to identify anomalies in craters. Total of 812 UXO items removed. Surface soil, subsurface soil, surface water, and sediment were sampled and analyzed for metals and explosives. Surface water and sediment samples were also analyzed for VOCs. Barium, cadmium, lead, and mercury levels exceeded RRS1. |
Parsons ES |
Order 126 |
|
|
1995 |
June |
Final Remedial Investigation Report (Parsons ES, 1995a) for B-20 submitted. Report recommended additional sampling and UXO clearing activities. |
Parsons ES |
Order 126 |
|
September |
Amendment to Project Plans (Parsons ES, 1995b) submitted to regulatory agencies for second phase of sampling. Second phase of remedial investigation conducted. Subsurface soils sampled near three first phase RI borings to determine if metals failed SPLP test. Surface soils sampled in south-central portion of site to better delineate extent of metals contamination. |
Parsons ES |
Order 126 |
|
|
October |
USFWS sent a letter of concurrence for planned vegetation clearing activities at the B-20 site. |
USFWS |
NA |
|
|
December |
Second Amendment to Project Plans (Parsons ES, 1995c) submitted to regulatory agencies. |
Parsons ES |
Order 126 |
|
|
1996 |
January - March |
Field activities conducted, including vegetation clearing to facilitate UXO identification, systematic sweep of surface for UXO with magnetometers within original site and perimeter, excavation and removal of buried UXO in craters, excavation and removal of buried UXO in northern 5 acres of site, and collection and disposal of scrap metal scattered over the surface of the site. |
Parsons ES |
Order 126 |
|
January |
All UXO items found on site to date (365 items) were detonated after receiving approval from TNRCC on January 29. |
Parsons ES |
Order 126 |
|
|
May |
UXO items identified since January 31 (447 items) were detonated on site. |
Parsons ES |
Order 126 |
|
|
June |
Addendum to the Remedial Investigation Report (Parsons ES, 1996b) submitted. Report recommended additional UXO clearing activities. |
Parsons ES |
Order 126 |
|
|
1997 |
January |
Third Amendment to Project Plans for Remedial Investigation submitted. |
Parsons ES |
RL33 |
|
January - September |
East extension to B-20 was cleared of vegetation and systematically swept for UXO. Soils from northern 5-6 acres of the site were sifted to remove UXO and metal scrap. |
Parsons ES |
RL33 |
|
|
March - April |
Phytoremediation, soil washing, and stabilization bench-scale treatability studies conducted. |
Parsons ES Phytotech Brice Eagle Const. |
RL33 |
|
|
1999 |
April |
EPA Memorandum indicated analytical results obtained from ITS are not usable for closure or compliance. |
EPA |
NA |
|
TNRCC’s early April inspection resulted in a requirement for B-20 waste removal. Initiated UXO investigation/mitigation actions for "Hot Soil" located at B-20. UXO removal was accomplished on approximately 80 cubic yards of soils at the B-20 site. |
Parsons ES USA Environ-mental |
RL33 |
||
|
July |
"Hot Soils" contaminated with hazardous lead levels were transported and disposed of in accordance with applicable regulations. Approximately 100 tons of soil were removed from B-20. |
Parsons ES Eagle Const. Texas Ecologist |
RL33 |
|
|
November |
Submitted work plan for resampling to replace analytical chemistry data generated by ITS Laboratory. |
Parsons ES |
NA |
|
|
2000 |
March |
Advanced 8 borings for Rework (SB1-8) and collected 16 samples for explosives analysis. |
Parsons ES Data Chem |
Rework |
|
April |
Collected 5 sift samples (Sift19-23 for rework) for metals and explosives analysis. |
Parsons ES O’Brien &Gere Data Chem |
Rework |
|
|
Collected 13 sift samples for VOCs, SVOCs, metals and explosives (3 samples) and metals only (10 samples). |
Parsons ES APPL, Inc. Data Chem |
RL83 |
||
|
November |
Initiated Phosphate Induced Metal Stabilization (PIMS) field scale treatability study project. |
Parsons UFA Ventures, Inc. |
ESTCP Project 200020 |
|
|
2001 |
February |
Draft field demonstration work plan submitted to UFA Ventures and the Environmental Security Technology Certification Program (ESTCP). |
Parsons UFA Ventures, Inc. |
ESTCP # 200020 |
|
May |
Initiated field construction efforts for treatment cell located at SWMU B-10, and mixing approximately 500 cubic yards of lead contaminated soil with PIMS material from SWMU B-20. |
Parsons Eagle Const. |
ESTCP # 200020 |
|
|
June |
Submitted final field demonstration work plan and completed field mixing efforts and test cell construction. |
Parsons UFA Ventures, Inc. |
ESTCP # 200020 |
|
|
Collected 2 soil samples from field demonstration site for total and TCLP lead analyses and total phosphate analysis. One sample from PIMS treated soils, and one sample from non-treated soils. |
Parsons APPL, Inc. |
ESTCP # 200020 |
||
|
July |
Collected one sample (0.45 micron filtered) of initial leachate generated at test site for total lead analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
|
|
August |
Collected two samples (0.45 micron and 0.1 micron filtered) of leachate at test site for total lead analyses |
Parsons APPL, Inc. |
ESTCP # 200020 |
|
|
Test Cell sump modified to improve flow capacity of water migrating through the treated soils. |
Parsons Eagle Const. |
ESTCP # 200020 |
||
|
September |
Collected one sample from test cell water holding pond for total lead analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
|
|
October |
Mixed PIMS material in remaining contaminated soils located at SWMU B-20 as an Interim Measure Corrective Action (IMCA). |
Parsons Eagle Const. |
ESTCP # 200020 |
|
|
Collected 8 soil samples from SWMU B-20 PIMS IMCA treated soils for TCLP lead analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
||
|
Collected one sample from test cell water holding pond for total lead analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
||
|
December |
Collected one leachate sample (0.45 micron filtered) from test site for total lead analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
|
|
2002 |
February |
Collected two leachate samples (0.45 micron and 0.1 micron filtered) from test cell sump for total lead analysis. Collected two soil samples (one from PIMS treated soil and one from untreated soils) for Bioassessment testing and total lead analysis. |
Parsons APPL, Inc. Parsons LANL APPL, Inc. |
ESTCP # 200020 ESTCP # 200020 |
|
April |
Collected three leachate samples (two 0.45 micron and one 0.1 micron filtered) from the SWMU B-20 IMCA site for total lead analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
|
|
Collected one soil sample from non-treated soils at SWMU B-20 for total lead analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
||
|
June |
Collected two leachate samples (0.45 micron filtered) from the SWMU B-20 IMCA site for total CSSA nine metals analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
|
|
July |
Collected two leachate samples (0.45 micron filtered) from the SWMU B-20 IMCA site for total CSSA nine metals analysis. |
Parsons APPL, Inc. |
ESTCP # 200020 |
|
|
Final RCRA Facility Investigation Report submitted. |
Parsons |
RL33 |
||
|
2003 |
December |
40 test pits excavated and samples collected. |
Parsons |
TO19 |
|
2008 |
June |
Collected 12 surface soil samples for arsenic, cadmium, copper, nickel, zinc, barium, chromium, mercury, and lead analysis. |
Parsons |
DY01 |
|
2009 |
April |
Site mowed to allow access for geophysical equipment. Geophysical survey performed, numerous anomalies found over entire site. |
Parsons |
DO11 |
|
2010 |
April |
Conducted MEC Hazard Assessment to evaluate the relative degree of hazard associated with the current site condition and for use in evaluating potential site closure options. |
Parsons |
DO50 |
|
June |
Performed XRF analysis at the site to determine the extent of metals in surface soils. |
Parsons |
DO50 |
|
|
2012 |
February |
SWMUs B-2, B-8, B-20/21, and B-24 were combined with RMU-1 as part of the active firing range. These sites will be investigated, remediated, and closed when the firing range is no longer active. USEPA Memorandum dated February 29, 2012. |
USEPA |
NA |