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[SWMU B-3]
Solid Waste Management Unit B-3
Chronology of Actions/Investigations
|
Year |
Month |
Action/Results |
Action Performed By |
Project Number |
|
1990-1991 |
NA |
Landfill area used for garbage disposal and burning trash was filled in 1990-91. |
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 1. Found two geophysical anomalies. Performed GPR survey at the site on February 15. |
Parsons ES |
Order 67 |
|
March |
Drilled seven soil borings (SB1-7) between March 7 and 16 and collected soil/rock samples. Found several VOCs, including DCE, PCE, TCE, and vinyl chloride, and chromium, copper lead, and nickel above background levels. TCE concentrations in three samples also exceeded RRS2 standards, as well as chromium, copper, lead, and manganese concentrations in one sample. Results are summarized in Table B3-1. |
Parsons ES |
Order 67 |
|
|
March |
Collected samples of shallow perched groundwater from SB1 on March 9. Found cis-1,2-DCE, PCE, TCE, and vinyl chloride above MCLs as summarized in Table B3-2. |
Parsons ES |
Order 67 |
|
|
June |
Performed first phase of soil gas survey between June 23 and 27. Found PCE and TCE at high concentrations; cis-1,2-DCE also found in association with PCE and TCE anomalies. |
Parsons ES |
Order 67 |
|
|
November - December |
Performed second, more detailed soil gas survey between November 14 and December 5. PCE and DCE results similar to initial results from first phase. Found additional TCE source area with high cis-1,2-DCE concentrations. |
Parsons ES |
Order 67 |
|
|
1996 |
February |
Submitted Work Plan for the SVE Pilot Test System to EPA and TNRCC. |
Parsons ES |
Order 67 |
|
February |
Between February 19 and 23, drilled 12 soil borings and constructed 6 vapor extraction wells (VEW) and 6 vapor monitoring points (VMP) within the borings for soil vapor extraction (SVE) pilot test. Collected 15 soil samples from 10 of the soil borings. Highest concentrations of VOCs found between 13 and 15 feet bgl within the main trench. TCE and DCE levels in several samples exceeded RRS2 criteria. Results are summarized in Table B3-3. |
Parsons ES |
Order 67 |
|
|
March |
Blower manifolded to the vapor extraction wells for SVE pilot test on March 4 and 5. |
Parsons ES |
Order 67 |
|
|
March |
Collected initial soil gas samples from extraction wells and monitoring points between March 5 and 7. Sampled for oxygen, carbon dioxide, and TVH using field instruments. Some samples were collected in canisters for VOCs testing by an off-site laboratory. |
Parsons ES |
Order 67 |
|
|
March |
Performed an air permeability test by extracting air from VEW-6 and monitoring pressure responses and soil gas changes at MPE and MPF on March 6. Results of these tests are provided in Volume 4. |
Parsons ES |
Order 67 |
|
|
March |
Between March 7 and 13, performed a second air permeability test by extracting air from VEW-1, located by monitoring pressure responses and soil gas changes in other test points. Monitored VOC emissions from blower exhaust. Collected air samples from emissions for determination of mass removal. |
Parsons ES |
Order 67 |
|
|
March |
Performed multiple configuration testing on SVE system on March 13 to identify interconnections in the subsurface of the trench. Shut down blower and drained 15-20 gallons of water from separator tank. |
Parsons ES |
Order 67 |
|
|
April |
Filed a standard exemption with TNRCC containing necessary calculations and site data for obtaining the emission exemption. |
Parsons ES |
Order 67 |
|
|
June |
TNRCC approved standard exemption for SVE air emissions. |
TNRCC |
Order 67 |
|
|
December |
Submitted Addendum to SVE Test Work Plan for performing an SVE treatability study at SWMU B-3 to AFCEE, EPA, and TNRCC. Submitted notice of alteration to standard exemption Registration No. 32405 for SVE system at CSSA, to operate SVE from different extraction configurations. |
Parsons ES |
RL17 |
|
|
December |
Drilled 4 confirmation soil borings near MPA, MPD, VEW1, and VEW2 on December 26 and 27. Collected confirmation soil samples from borings. |
Parsons ES |
RL17 |
|
|
December |
Drilled 12 soil borings and installed 12 vapor extraction wells for SVE treatability test between December 26 and 30. Collected soil samples for laboratory testing of metals and VOCs from soil borings. |
Parsons ES |
RL17 |
|
|
1997 |
January - February |
Shut off blower system on 7 January and began hydrocarbon recovery test. Collected soil gas samples periodically throughout test period to assess changes in soil gas, oxygen, TVH, and carbon dioxide. |
Parsons ES |
RL17 |
|
February - March |
Reconfigured extraction well network (6 VEWs) and restarted blower system. Collected air emission samples from blower exhaust and monitored soil gas changes and pressure responses from non-extracting VEWs and VMPs for a 28-day test period (multiple configuration test). Collected emission samples for off-site laboratory analysis. |
Parsons ES |
RL17 |
|
|
March |
Reconfigured extraction well network (6 VEWs) and restarted blower system for second multiple configuration test, duration 14 days (March 13 through 27). Collected emission samples for laboratory analysis. |
Parsons ES |
RL17 |
|
|
April - May |
Reconfigured extraction well network (6 VEWs) and restarted blower system for final multiple configuration test. Collected emission samples for laboratory analysis. |
Parsons ES |
RL17 |
|
|
June |
Designed and procured automated timer for the moisture separator drain attached to the blower system. Installation is pending. |
Parsons ES |
RL17 |
|
|
July |
Submitted draft technical report on SVE expanded pilot study. Final will be submitted after ITS Laboratory data issues have been resolved. |
Parsons ES |
RL17 |
|
|
1999 |
September |
Submitted draft second addendum to Soil Vapor Extraction Test Work Plan |
Parsons ES |
RL83 |
|
November |
Submitted work plan for resampling to replace analytical chemistry data generated by ITS Laboratory. |
Parsons ES |
NA |
|
|
2000 |
January |
Conducted initial diagnostic check of SVE system. Plumbing system was completely inspected and necessary repairs were made. New blower installed. Initial vapor samples collected from each of the extraction wells and monitoring points. |
Parsons ES, |
RL74 |
|
2001 |
January - February |
Twenty-nine soil gas survey samples were collected and analyzed for chlorinated and aromatic volatile organics. PCE, TCE, and cis-1,2-DCE were detected. |
Parsons |
DO5084 |
|
2002 |
August - November |
Interim removal action (IRA) activities performed at SWMU B-3 including dismantling and removal of SVE system, exploratory trenching, excavation and off-site disposal of contaminated soil media, confirmation sampling, and re-grading of site. |
TetraTech - FW |
DO0023 |
|
2003 |
December |
Updated SWMU B-3 Permit By Rule for new SVE System |
Parsons |
TO0006 |
|
2004 |
December |
SVE system operations formally terminated at SWMU B-3 due to its decreased effectiveness. |
Parsons |
NA |
|
2005 |
September - January 2006 |
Pilot Study for SWMU B-3 Enhanced Bioremediation and tracer study. |
Parsons |
TO0006 |
|
2006 |
February |
TCEQ Authorization 5X600408 for Class V Aquifer Remediation Injection Well for B3-MW01. |
Parsons |
TO0006 |
|
July - November |
Construction of the SWMU B-3 bioreactor. See SWMU B-3 Bioreactor Construction Report. |
Parsons |
TO0006 |
|
|
July and October |
TCEQ Authorization 5X600431 for Class V Aquifer Remediation Injection Galleries at B-3 Bioreactor |
Parsons |
TO0006 |
|
|
2007 |
April |
Initiated SWMU B-3 Bioreactor Operations |
Parsons |
TO0006 |
|
2009 |
March - April |
Extraction well B30EXW01 constructed at bioreactor to supplement and enhance water demands of the treatment system. See B-3 Extraction Well Construction Summary. |
Parsons |
DO0011 |
|
December - August 2010 |
One new groundwater extraction (B3-EXW02) well and nine new UGR monitoring wells installed at SWMU B-3 bioreactor between December 2009 and August 2010 to provided additional data and characterization of subsurface contamination. See Construction Summary for SWMU B-3 Extraction Well 02 and Shallow Monitoring Wells. |
Parsons |
DO0050 |
|
|
2011 |
May |
Extraction well B30EXW03 constructed at bioreactor to supplement and enhance water demands of the treatment system. |
Parsons |
G012 |
|
June |
Extraction well B30EXW04 constructed at bioreactor to supplement and enhance water demands of the treatment system. |
Parsons |
G012 |
|
|
2012 |
April |
Completed Bioreactor Building Upgrades including installation of additional biomass into all trenches. |
Parsons |
G012 |
|
May |
Extraction well B30EXW05 constructed at bioreactor to supplement and enhance water demands of the treatment system. |
Parsons |
G012 |