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8th Quarter - Final Quarterly Progress Report
RCRA Facility Investigation
The RFI is being conducted to characterize the environmental setting of CSSA, define the sources of contamination, define the degree and extent of contamination, and identify actual or potential receptors and any additional IM that may be warranted. The RFI is estimated to represent approximately 30% of the required actions at CSSA. The RFI includes a Preliminary Report (5% of RFI), RFI Work Plan (10%), Facility Investigation (45%), Investigation Analysis (10%), Treatability Studies (10%), and Progress Reports (5%). At the end of Quarter 8, the RFI is approximately 38% complete.
Task I - Preliminary Report - Description of Current Conditions
Task Description
This task includes preparation of the Description of Current Conditions (DCC) Report. The DCC Report includes information from previous investigations and other relevant data. Information related to the facility background, nature and extent of contamination, and pre-investigation evaluation of corrective measure technologies is included in the DCC Report. CSSA’s Environmental Encyclopedia was used to meet the DCC Report submittal requirements.
Completion of this task has been fully funded (under delivery order RL74). The final DCC Report was submitted to EPA and TNRCC on August 1, 1999. No regulatory comments have been received on the report.
Activities this
Quarter
No activities associated with the preliminary report during this reporting period, with the exception of the addition of the Groundwater Investigation and Source Characterization Report (Parsons ES, June 1996), the B-20 Remedial Investigation Report (Parsons ES, June 1995), and Addendum to the B‑20 Remedial Investigation Report (Parsons ES, June 1996) to the electronic Environmental Encyclopedia. This task makes up approximately 5% of the RFI phase, and it is 100% complete.
Task Description
The Order requires that the RFI Work Plan include a Project Management Plan, Data Collection Quality Assurance Plan, Health and Safety Plan, and a Community Relations Plan (CRP). As previously agreed by EPA, CSSA’s Environmental Encyclopedia, which includes all of the information required by the Order, in a unique format, will be used to fulfill this requirement.
Completion of this task is funded for the RFI tasks that are planned.
Activities this Quarter
Site specific field sampling plan addenda for the RFI soil and perched groundwater sampling planned at AOC 67 and AOC 65, and the off-site and on-site groundwater sampling (under AETC DO5084) were submitted to AFCEE and CSSA for review on February 16, 2001, and comments were received by March 15, 2001. The RFI task was initiated earlier than originally scheduled to investigate the possible contaminant sources around Building 90 prior to collection of any off-site groundwater samples. Soil sampling locations at AOC 65 were selected based on the results from the soil gas survey, with three sampling locations inside Building 90 and 11 boring locations around the perimeter of Building 90. In addition, four of these soil borings were converted into monitoring wells to monitor shallow groundwater conditions in the vicinity of Building 90.
The majority of the RFI Work Plan was submitted to CSSA and AFCEE in an electronic hyperlinked format on January 10, 2001. Additional RFI Work Plan material will be added as it is finalized.
Percent Complete
This task makes up approximately 10% of the RFI phase. Estimation of percent complete is difficult due to the continuing need for plan addenda. As of the end of Quarter 8, work currently under scope is approximately 98% complete. The remaining 2% of this task is associated with a WAP for PIMS activities and the CSSA Encyclopedia hypertext document, which will be incomplete for an indefinite period of time as work plan addenda are prepared.
Summary of Findings
No new findings associated with RFI Work Plan preparation during this reporting period.
Summary of Changes
Work plan amendments to the DO5068 AOC investigations and RL83 Well Installations were submitted and approved during Quarter 8.
Modifications to the Work Plan, Field Sampling Plan, and Site-Specific Plans were submitted to AFCEE and CSSA for review on September 22, 2000. The updated plans addressed modifications to the DO5068 work scope for investigative actions at AOCs 35, 42, 43, and 50. The investigative approach for these sites was modified based upon Phase I geophysical results and roundtable discussions/decisions at the February 3, 2000 TIM. Comments with respect to the amended plans were received on October 16, 2000. Responses to these comments were prepared and submitted on November 3, 2000. Additional clarifications were requested on November 21, 2000. The draft final work plans were submitted on December 8, 2000. The final work plan revisions were submitted on February 9, 2001.
An addendum to the RL83 Cluster Well Work Plan and Sampling and Analysis Plan was submitted to CSSA, AFCEE, and the EPA on November 14, 2000. The addenda provided for the use of drilling foam (QuikFoamä) to assist drill-cutting removal from large-diameter boreholes during the drilling program. This addendum was approved by AFCEE and CSSA. A second addendum to the RL83 work plans was submitted on January 11, 2001 to provide for alternative grouting methods of surface casing and re-sizing the mesh size of the monitoring well filter pack. CSSA and AFCEE provided comments to Parsons ES for this second addendum on January 19, 2001. Based on the government comments, the final work plan amendment for the installation of the RL83 and DO23 wells was submitted on February 9, 2001. The amendment to the work plans provided for the release of uncontaminated drilling fluids and purge waters, provided a strategy for addressing contaminated perched water, and modified the construction materials to be used in the construction of the wells (e.g. PVC casing).
Summary of Contacts
No contacts related to the RFI Work Plan were made during this reporting period.
Summary of Problems
No problems related to the RFI Work Plan during this reporting period.
Actions Taken to Correct Problems
No actions to correct problems necessary during this reporting period.
Projected Work for the Next Quarter
All plans and plan addenda for DO5084 are completed, with the exception of the Waste Analysis Plan (WAP) for the PIMS activities. The WAP addenda will be prepared during the next quarter.
Addenda revisions to the RL83 Cluster Well Work Plan are anticipated during the next quarter to address well completion modifications necessary due to contamination detected in the southwest corner of CSSA. These changes will include conducting packer tests at discrete intervals, setting temporary casing over intervals with elevated levels of contamination, adding bentonite to boreholes to prevent vertical migration of groundwater contamination while the wells are idle, and if necessary, installation of permanent casing.
Copies of Daily Reports, Inspection Reports, Data, etc.
No daily reports, inspection reports, or data related to the RFI generated during this reporting period.
Task III - Facility Investigation
Task Description
An investigation of the facility will be conducted to A) characterize the environmental setting of the facility; B) define the source(s) of contamination; C) define the nature and extent of contamination; and D) identify actual or potential receptors. In some cases, multiple phases of investigation may be necessary. The investigation results will be used to develop and evaluate alternatives during the Corrective Measures Study. All investigation activities are being conducted in accordance with the RFI Work Plan. Deviations have been documented with work plan addenda.
Completion of this
task is partially funded for the RFI tasks that are planned. Investigation of all SWMUs, except SWMU B-2,
is funded, and investigation of all AOCs, except AOCs 44-46, 49, 51-55, 59, 60, 62-64, and 67-73, is funded.
Preparation of work plan addenda for the AOC65 and AOC67 RFIs was
complete upon completion of soil gas surveys planned under the new AETC DO (No.
5084). The investigation work at AOC 65
and AOC 67 includes drilling and sampling of 16 soil borings, 3 of which are
inside Building 90 and 13 of which are located outside of the building. Drilling was completed, and four monitoring
wells were installed by CSSA under a contract with JEDI. (One of these monitoring wells is a nested
well, with two casings in one well).
Currently, the
installation of four well clusters and three individual wells (12 wells total)
is funded.
Activities this Quarter
Wipe samples were
taken from SWMUs I-1 (Incinerator) and Bldg. 43 (makeshift burn unit) and sent
to Triangle Laboratories located in North Carolina for dioxins and furans
during Quarter 8. Analytical results
are expected to be validated and included in the respective SWMUs investigation
reports.
The installation
of monitoring wells began on November 15, 2000. Through April 30, 2001, a total of nine wells have been
installed. The tenth well, MW8-LGR
being drilled early in Quarter 9.
Field activities initiated with the start of the MW9 well cluster,
located in the North Pasture serving as an upgradient well position. Cores were retrieved, sampled, and archived
from the Glen Rose, Bexar Shale, and Cow Creek members of the Middle Trinity
Aquifer. Borehole geophysics and
injection packer tests were performed in the borehole, which penetrated the underlying
Hammett Shale at 457 feet below grade.
A second rig was mobilized to the site on January 19, 2001 to assist in
the well installations. This second rig
was demobilized in mid-February, after drilling at MW7-LGR was completed. During Quarter 8, three Lower Glen Rose
wells (MW3-LGR, MW4-LGR, and MW5-LGR) were installed and developed under
DO23. Preliminary data from generated
purge waters indicate that groundwater from well MW5-LGR, MW7-LGR, and MW8-LGR
is contaminated with PCE, TCE, and a variety of other VOCs. Groundwater from this well is currently
being contained for eventual treatment and discharge from the CSSA granular
activated carbon (GAC) system (Attachment 3).
RCRA Facility
Investigations were performed at AOCs 35, 42, and 43 between the dates of March
19, 2001 and April 5, 2001 under the AETC DO 5068. Five surface samples were collected from AOC 35 and analyzed for
PCE, TCE, DCE isomers, carbon tetrachloride, and chloroform. These five compounds were listed as
compounds of concern in the South Pasture area. Nine soil borings were drilled to depths between 15 to 20 feet
below grade at AOC 42. The borings were
placed at the edges of anomalies identified previously during the geophysical
surveys. A UXO avoidance team was
utilized to provide surface and subsurface magnetometer clearance. Three samples were collected at each boring
location for PCE, TCE, DCE isomers, carbon tetrachloride, chloroform, metals,
and explosives. Three surface samples
were obtained from AOC 43 for metals and explosives analyses. All VOC and inorganics analyses are being
performed by O’Brien & Gere Laboratories, while the explosives analyses are
being performed by DataChem. Results of
the sampling have not been received through the end of Quarter 8.
Verification of
data packages (total of 120 packages) continued during Quarter 8. A meeting was held March 29, 2001, with
CSSA, AFCEE, WPI, Informatics, and Parsons ES to discuss data validation. In addition, teleconference calls were held
with the laboratories (APPL and O'B&G) on April 5, 10, and 19, 2001 to
discuss data package issues. Action
items resulting from this meeting and these teleconference calls are included
in Attachment 4, along with the latest schedule for data package submittal.
Soil gas surveys at AOC 65 and AOC 57 were initiated on January 2, 2001 using a geoprobe rig and durable soil gas rods to attain reasonable depths for each soil gas sampling point. A mobile laboratory (DHL Analytical) supported the soil gas survey effort using their standard operating procedure for modified method 8021B (8021mobile-sv-01). Preliminary laboratory data were submitted to Parsons ES and CSSA by the mobile laboratory on a daily basis. The Parsons ES chemists performed cursory reviews of the preliminary data to make sure there were no obvious problems or errors with the data quality. Positional and screening data collected at each sampling point were recorded in the GPS Trimble unit and downloaded daily into the CSSA database.
The soil gas field work was completed by February 23, 2001. Parsons ES received all ERPIMS quality data reports from the soil gas survey by March 9, 2001. Parsons ES chemists completed the data review and determined that the data were usable for the intended purposes. The data indicated PCE detected in the vicinity of Building 90 only, with no detectable concentrations of any contaminants anywhere else throughout the initial grid layout. Approximately 150 soil gas grid points reserved for grid tightening were not used because of the small number of contaminated areas identified following the initial grid sampling. These soil gas grid points were used at SWMU B-3 (29 grid locations), AOC 55 (54 grid locations), SWMU B-4 (20 grid locations, AOC 63 (2 grid locations), and the wastewater treatment plant (42 grid locations).
Parsons ES initiated drilling and soil sampling associated with the AOC 65 and AOC 67 RFI on March 22, 2001 and completed the sampling at AOC 65 by March 29, 2001. Drilling at AOC 67 was complete by April 4, 2001. CSSA contracted with Jones Environmental Drilling, Inc. (JEDI) to ream four of the AOC 65 soil borings drilled during the RFI and construct monitoring wells for future monitoring efforts. The four monitoring wells were located around the southern perimeter of Building 90. One of these wells is a nested well, which includes two casings in one monitoring well. The total depth of these wells ranged from 19 feet below grade to 33 feet below grade. Groundwater samples have been collected from three of the five monitoring well casings and one soil boring. The two remaining wells did not produce water in this upper zone.
Low-flow pumps have been installed at MW9-LGR, MW9-BS, and MW9-CC.
Percent Complete
This task makes up approximately 45% of the RFI phase. As of the end of Quarter 8, this task is approximately 20% complete.
Summary of Findings
Data collection from the well cluster installations continued through the end of Quarter 8. The installation of MW3-LGR, MW4-LGR, and MW5-LGR in the northern portion of the facility indicated that the characteristics of the Lower Glen Rose are fairly consistent with the findings of the same formation drilled at the MW9 cluster. The depth to the formation bottom was as predicted, and the lithology, hydraulic properties, and borehole geophysical characteristics are comparable. South, in the vicinity of Building 90, the formational contacts were deeper than previously estimated. Evidence of faulting at core hole location MW7 indicates that locality was highly fractured by structural mechanisms. Circulation was lost during the drilling of MW7, and caliber logs showed significant voids at several depths within the core hole. The MW7 core hole was plugged with grout after a total depth was reached to prevent any vertical migration of contamination. Nearby at the upgradient MW6 location, the bedrock is massive and competent. The Bexar Shale wells installed both at MW9-BS (in the North Pasture) and MW6-BS (upgradient of Building 90) both exhibited the unique property of elevated pH levels above 10. The other six wells that were installed through Quarter 8 exhibited normal pH levels in the range of 7.2. The high pH seems to be a property of the Bexar Shale formation. It is unknown at this time if the Bexar Shale matrix possesses a naturally high pH, or if it is a function of its low-yielding material and that groundwater tends to move downward from portions of the formation in contact with the annular seal (grout and bentonite).
A total of 130 soil gas samples were collected form AOC 57 (40 from the northern portion, 68 from the central portion, and 22 from the southern portion). Only low levels of BTEX compounds were detected in some of these samples. The infrequent and sporadic BTEX detections were attributed to artifact contamination/interference from the concurrent operation of the geoprobe rig or gas powered generator. An additional 203 soil gas samples were collected around the perimeter of Building 90 at AOC 65. Low levels of PCE were detected in several soil gas samples around the perimeter of Building 90 on the east, west, and south sides. Higher concentrations were found on the west side near the southern-most PCE vat location, with the highest concentration detected at 1,590 micrograms per liter (µg/L). TCE was detected in five soil gas samples collected on the west side of Building 90 in the same sample associated with the highest PCE levels. The highest TCE level detected was 8.56 µg/L. Low levels of cis-1,2-DCE was detected in two of the soil gas samples collected on the west side of Building 90, with the highest detected level at 0.88 µg/L.
A total of 40 soil gas samples were collected inside Building 90. PCE was detected in every sample with the highest levels detected in the southwest portion of the building, mainly concentrated around the southern-most PCE vat location. The highest detected PCE levels were encountered in samples 11 and 27 at 8,350 µg/L and 24,000 µg/L, respectively. TCE was also detected in this same area in five of the soil gas samples at a maximum concentration of 0.44 µg/L. Three low levels of benzene and toluene were also detected, but were considered as artifact contamination emanating from the generator operation.
The grid around Building 90 was extended on the south side of the building, and 77 additional soil gas samples were collected. Only low levels of benzene and toluene were detected in these samples.
A total of 42 soil gas samples were collected from locations around the wastewater treatment plant. Low levels of BTEX were found in six of these samples, and no other contaminants were identified. These hits are likely to be associated with prescribed burning in the area.
A total of 29 soil gas samples were collected at SWMU B-3. PCE, TCE, and cis-1,2-DCE were detected in over half of the samples. PCE was detected in 16 samples, with the highest levels encountered on the east side of the road that runs adjacent to SWMU B-3 in the northern portion of the SWMU. The highest PCE level detected was 13,800 µg/L. TCE was detected in 26 of the 29 samples, but at generally lower levels than PCE with the highest reading at 980 µg/L reported for a sample collected on the east side of the road in the northern portion of the site. Cis-1,2-DCE was detected in 19 samples with the highest concentrations detected in the samples collected in the same general areas on the northern portion of the site. The highest detected level was 256 µg/L. A sample collected from this area also had the only detection of trans-1,2-DCE. A soil gas sample was collected from the operating SVE system for comparison (VEW-02) with TCE detected at 5.0 µg/L and cis-1,2-DCE detected at 21.1 µg/L. Vinyl chloride was detected in two samples collected on the east side of the road at levels below 0.5 µg/L. Low levels of BTEX were also detected sporadically throughout the site, but these concentrations are suspected to be caused by operating the geoprobe rig or gas powered generator to collect the samples.
Fifty-four (54) soil gas samples were collected at AOC 55. PCE was detected at low levels relative to concentrations encountered at other locations. These detections are suspected to be the result of equipment interference (sample dessicator, soil gas rods, and fittings that enable tubing to be connected from the rods to the dessicator). Benzene was also detected at low levels in two of the samples. The detection of benzene is considered to be caused by interference from the gas powered generator or geoprobe rig.
Soil gas samples were collected at SWMU B-4 (20 sample locations) and AOC 63 (2 sample locations). No contaminants were detected in any of these sample points.
Summary of Changes
DO5084 was issued under Parsons ES’ contract with AETC to continue RFIs at AOC65 and AOC67, and complete a soil gas survey at AOC 65 and AOC 57.
The soil gas survey performed under DO5084 was modified to allow surplus soil gas sampling grid locations to be sampled and tested from areas other than AOC 65 and AOC 57. These grid locations were completed at the Waste Water Treatment Plant, SWMU B-3, SWMU B-4, AOC 55, and AOC 63.
Camp Stanley is in the process of installing 15 new monitoring wells to evaluate ground water conditions in the Middle Trinity Aquifer. This work includes seven wells to be completed in the Lower Glen Rose limestone, four to be completed in the Cow Creek limestone, and four completed in the Bexar Shale. Through April 23, 2001, a total of nine wells are finished: 5 Glen Rose completions (MW-9 LGR, MW-3 LGR, MW-4 LGR, MW-5 LGR, and MW-6 LGR), 2 Cow Creek completions (MW-6 CC, MW-9 CC), and 2 Bexar Shale completions (MW‑6 BS, MW-9 BS). In addition to these wells, another 13 monitoring wells (1 Glen Rose, 6 Bexar Shale, and 6 Cow Creek) wells are in the planning stages.
Drilling on MW8-LGR is currently underway. Based on recent groundwater analyses, elevated VOC contamination was identified in upper portion of this boring. Packer testing of isolated zones within the upper Glen Rose indicated PCE levels ranging from 3 to 57 ppb. Based on these findings, temporary casing was set to 173 feet. The goal of this casing is to seal off contaminated water from the upper zones and prevent vertical migration of contamination while the borehole is advanced into deeper zones within the Glen Rose.
In light of the elevated contamination levels and because of the proximity of MW8 to the base boundary and off-base drinking water wells, CSSA has decided that four additional wells (two Glen Rose and two Cow Creek) need to be installed to the south/southwest and southeast of the MW8 location. These additional wells will act as sentry wells for the nearby off-site wells and further define the lateral and vertical extent of groundwater contamination at the base boundary. To help accomplish this and to make best use of the CSSA drilling budget, it is recommended that two of the scheduled Bexar Shale wells (MW7 BS and MW8 BS) be replaced by these two proposed wells (MW10-LGR and MW10-CC). The remaining two wells (MW11-LGR and MW11-CC) will be funded under a new delivery order. The SOW is being developed at the present time. The current plan also includes the installation of new Bexar Shale wells at MW1, MW2, and MW5.
This change in plan will allow us to focus more attention on the Lower Glen Rose and Cow Creek, which are the major ground water producing intervals in both on- and off-base drinking water wells. It is also justified based on well development, injection test, and laboratory permeability data that was derived from MW-6 BS and MW-9 BS. This information indicated the Bexar Shale is relatively impermeable and not likely to transmit significant volumes of water to on- or off-base wells. If needed, Bexar Shale wells could be installed at a later date.
Summary of Contacts
CSSA has been in close contact with the EPA since contaminated (above MCL) groundwater was detected in the open borehole of the MW8 cluster.
Summary of Problems
Slow submittal and approval of the large number of analytical data packages has hampered progress on completion of closure/investigation reports. There are numerous laboratories, chemists, and analytical methods involved. Between January 18, 2001, and April 8, 2001, no packages were submitted due to outstanding unresolved issues.
Actions Taken to Correct Problems
As described above, more frequent meetings and weekly teleconference calls have been held over the past month to expedite resolution of outstanding laboratory package issues. Between April 9, 2001, and April 30, 2001, six data packages (Rework Group A, RL33 Group B, RL74 Group C, RL74 Group G, RL74 Group H, and RL74 Group J) have been submitted.
Projected Work for the Next Quarter
The installation and development of 15 monitoring wells at CSSA will continue through Quarter 9.
Under AETC DO5084, the Draft Technical Report for the soil gas survey will be completed for AFCEE and CSSA review. Analytical results from the RFI soil and groundwater sampling activities for the AOC 65 and AOC 67 RFI soil borings will be received and reviewed for quality control and usability. Preparation of the draft RFI report will be prepared and following approval of the analytical data report (ITIR), the draft RFI report will be submitted to AFCEE and CSSA for review.
Copies of Daily Reports, Inspection Reports, Data, etc.
Data related to the soil gas survey (RFI) were generated during this reporting period. Draft summary tables and figures are attached to this report that present the results from the soil gas survey sample analysis (Attachment 5).
Task IV - Human Health and Ecological Risk Assessment
Task Description
This task includes a screening risk assessment, or if necessary, a baseline risk assessment for the potential human health and environmental risks posed by the site in absence of any remedial action. For human health risks this effort will involve the following components: 1) contaminant identification; 2) exposure assessment; 3) toxicity assessment; and 4) risk characterization. For ecological risks, the effort will include the following components: 1) problem formulation; 2) exposure assessment; 3) ecological effects assessment; and 4) risk characterization.
Completion of this task is partially funded. Currently planned and funded (under RL83) is preparation of a preliminary basewide human health and ecological Conceptual Site Model (CSM) for risk assessment. The CSM identifies potential human and ecological receptors and land use surrounding the facility. In addition, a Risk Assessment Technical Approach has been prepared.
No actions this quarter related to the human health and ecological risk assessment. This task makes up approximately 15% of the RFI phase. The amount of effort needed to accomplish this task is not yet known because analytical data are not yet available or have not yet been fully evaluated. The percent complete depends on the number of sites requiring risk assessment.
Task V - Investigation Analysis
Task Description
This task includes preparation of an Investigation Analysis to support the selection of protection standards for CSSA. It will be submitted along with the Risk Assessment Report, and it will describe the extent of the contamination in relation to background levels indicative for the area around CSSA. Background levels will be used to determine the possibility of closure under Risk Reduction Standard 1. The Investigation Analysis will also include groundwater protection standards and other relevant protection standards. The relevant protection standards will be used at sites where a Standard 1 closure is not applicable. Due to the recent promulgation (September 23, 1999) of the Texas Risk Reduction Program (TRRP, 30 TAC §350) by the TNRCC, two options are being considered for the protection standards. One option is to base the protection standards on the Risk Reduction Rule Standard 2 Media-Specific Concentrations. The other option is to use the Protective Concentration Limits developed under TRRP. The decision will be made as additional information becomes available.
Activities this Quarter
During this quarter, data table preparation was continued to compare investigation results to closure criteria. Preparation of investigation/closure reports for each SWMU investigated last year was continued.
Percent Complete
This task makes up approximately 10% of the RFI phase, and is approximately 27% complete.
Summary of Findings
No new findings associated with Investigative Analysis preparation during this reporting period.
Summary of Changes
No changes associated with the Investigative Analysis during this reporting period.
Summary of Contacts
No contacts related to the Investigative Analysis were made during this reporting period.
Summary of Problems
No problems related to the Investigative Analysis during this reporting period.
Actions Taken to Correct Problems
No actions to correct problems necessary during this reporting period.
Projected Work for the Next Quarter
Continued work on comparison of investigation results to closure criteria.
Copies of Daily Reports, Inspection Reports, Data, etc.
No daily reports, inspection reports, or data related to risk assessment generated during this reporting period.
Task VI - Treatability Studies
Task Description
This task may include a Treatability Study Program, if so directed by EPA. Treatability studies are performed to determine the applicability of corrective measure technologies to conditions or problems at or resulting from waste management activities at CSSA. Where it is determined by EPA that treatability testing is necessary, candidate technologies will be identified, a treatability study Work Plan will be prepared, the treatability study(ies) will be implemented, and a treatability study report will be prepared.
Completion of this task is partially funded. Currently planned and funded (under RL33) is completion of a treatability study report for SWMU B-20, and continued operations and maintenance of the soil vapor extraction (SVE) system at SWMU B-3 (under RL74 and RL83).
Activities this Quarter
As part of the Task II Interim/Stabilization Measures, a treatability study for stabilization of the excavated soils was continued during Quarter 8. The ESTCP and UFA Ventures, Inc. are demonstrating a stabilization process using PIMS on soils contaminated with lead and other metals. The PIMS laboratory benchscale treatability studies were completed during Quarter 5. The draft PIMS field study work plan was submitted to ESTCP on February 15, 2001 and comments received March 29, 2001. Comments on the draft work plan were received from CSSA on March 28, 2001 and from ESTCP on April 3, 2001. No comments are anticipated from AFCEE or TNRCC. The TNRCC was contacted April 17, 2001, regarding the placement of the PIMS field test. Because of the need for power, more water, and access, it was determined that the area within SWMU B-10 would allow better access to CSSA's infrastructure. Kirk Coulter provided his concurrence to move the field test study area from SWMU B-20 to SWMU B-10. A construction quality assurance plan was prepared for the intended field activities and submitted to ESTCP April 19, 2001. Field efforts were initiated during this reporting period with the construction of a field test cell expected to be completed during Quarter 9. Monitoring of the field treatment efforts are expected to continue for a minimum of one calendar year.
The final round SVE laboratory and field data were collected at SWMU B-3 in accordance with the SVE operations and monitoring (O&M) schedule detailed in the Soil Vapor Extraction Test Work Plan, Second Addendum (December 1999) on February 22, 2001. During the final months of operation maintenance, the extraction flow rate from the SVE system was increased to approximately 4,500 feet per minute (or 98 cfm). The flow at various VEWs was adjusted, as needed, to maintain the main exhaust flow at or near 98 cfm. This flow rate is 10 cfm below the TNRCC-approved standard exemption for emissions from the SVE system. Since installation of the SVE system at SWMU B-3, it is estimated that over 500 lbs. of volatile organic hydrocarbons have been removed from site soils.
According to the data collected through 10 months of operation, the SVE system has not resulted in contaminant emissions in exceedance of the standard exemption for the B-3 SVE system. Data from the 10-month sampling event were reviewed by Parsons ES chemists, but final AFCEE approval of the data was not received during the subject reporting period.
Analytical results from resampling of the soil samples collected as part of the initial SWMU B-3 treatability study (1997) were received during this reporting period. The data from this resampling event are continuing to be reviewed and evaluated, and are not yet approved.
Percent Complete
This task makes up approximately 10% of the RFI phase. The amount of effort needed to accomplish this task is not yet known because analytical data are not yet available. The percent complete depends on the number of sites requiring treatability studies and/or the need for a Treatability Study Program.
Summary of Findings
Analytical data received from waste characterization efforts for the soil piles generated from UXO investigations at SWMUs B-8, B-20, B-24, B-28, and DD resulted in a non-hazardous waste classification. All results will be reported in the Soil Pile Disposition Report expected to be completed during Quarter 9.
Analytical data from the 10-month emissions sampling event (performed November 6 and 7, 2000) at B-3 has not been approved. The draft Operations and Maintenance Assessment Report for the entire year of testing will be completed upon AFCEE approval of the data packages.
Summary of Changes
No changes associated with the treatability studies during this reporting period.
Summary of Contacts
No contacts related to the treatability studies were made during this reporting period.
Summary of Problems
No problems related to the O&M activities at SWMU B-3 or the B-20 treatability studies during this reporting period.
Actions Taken to Correct Problems
No actions to correct problems necessary during this reporting period.
Projected Work for the Next Quarter
Bi-weekly system checks were completed on February 22, 2001. No additional O&M testing is planned until the findings and recommendations from the O&M report are evaluated. The final SVE system assessment report is tentatively scheduled for submittal during the next quarter (Quarter 9).
It is anticipated that UFA Ventures will complete construction and treatment of approximately 500 cubic yards of lead contaminated soils from SWMU B-20 as part of a field demonstration for PIMS during the next quarter.
Copies of Daily Reports, Inspection Reports, Data, etc.
No daily reports, inspection reports, or data related to the treatability studies were generated during this reporting period.
This task includes quarterly progress reports pertaining to the status of the RFI phase of work. This progress report is submitted as part of this task.
Completion of this task is partially funded. Progress reports for two years (August 1999 – May 2001) are funded under RL83 of the AMC contract. Six additional progress reports (June 2001 – October 2002) are funded under DO5084 of the AETC contract.
Percent Complete
This task makes up approximately 6% of the RFI phase. The percent complete is unknown because the number of treatability studies necessary is currently unknown, however it is estimated at approximately 6%.
Summary of Findings
No findings associated with the progress reports during this reporting period.
Summary of Changes
No changes associated with the progress reports during this reporting period.
Summary of Contacts
No contacts related to the progress reports were made during this reporting period.
Summary of Problems
No problems related to the Progress Reports during this reporting period.
Actions Taken to Correct Problems
No actions to correct problems necessary during this reporting period.
Projected Work for the Next Quarter
Progress Report for Quarter 6 will be submitted.
Copies of Daily Reports, Inspection Reports, Data, etc.
No daily reports, inspection reports, or data related to the Progress Reports generated during this reporting period.