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13th Final
Interim Measures
Interim Measures (IMs) are being conducted to mitigate a current or potential threat to human health and/or the environment. The IMs are estimated to represent approximately 30 percent of the required actions at CSSA. The IMs include Interim/Stabilization Measures WP (7 percent of IM), Interim Measures Implementation (70 percent of IM), and Reports (23 percent of IM). Based on information currently available at the end of Quarter 13, the IMs are approximately 48 percent complete.
Task I - Interim/Stabilization Measures Work Plan
Task Description
The Interim/Stabilization Measures WP includes:
A description of on-going and planned IMs;
A statement of the objectives of each interim/stabilization measure, including how the measure mitigates a potential threat to human health and the environment and is consistent with and integrated into any long-term remedy for CSSA; and
Proposed locations, design plans and specifications, construction, and operation and maintenance (O&M) requirements of the IMs, including a sampling and analysis plan (SAP).
Existing plans, which are included in CSSA’s Environmental Encyclopedia, are referenced to the extent possible.
Interim/Stabilization Measures include initial sampling and analysis of groundwater from off-post wells; sampling and analysis of groundwater in CSSA wells; identification of all off-post water wells located within ¼-mile of the facility boundary; evaluation of alternative measures and implementation of selected interim measures at Solid Waste Management Unit (SWMU) O-1; closure of SWMU O-1; characterization and determination of proper disposition of SWMUs B-8, B-20, B-24, B-28, and the Demolition Dud (DD) Area soil piles; and implementation of the identified disposition method. Continuation of on-post and off-post groundwater sampling and analysis is being performed under the RFI phase of this project. The status of each interim measure is described below.
An appropriate disposition method will be identified for the soil piles (under RL83). However, final implementation of the yet to be selected disposition method is not funded. Due to the amount of soil in these piles, it is anticipated that funding may be spread over several years.
A water well survey was conducted under RL83 to identify all wells within ¼-mile of the CSSA facility boundary. The final version of the Water Well Survey Report was submitted during Quarter 10 and is located in the Environmental Encyclopedia in Volume 5, Groundwater, Offsite Well Survey Report (August 2001).
Activities this Quarter
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Efforts relating to the determination of proper disposition of previously sifted soil piles at SWMUs B-8, B-20, B-24, B-28, and the DD area funded under RL83 were continued in Quarter 13. The Draft Soil Pile Disposition Assessment Report funded under RL83 will be completed. The initiation of bench-scale studies of other treatment technologies (e.g., density treatment, phytoextraction, etc.) will continue during Quarter 14. |
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O&M for the Phosphate-Induced Metals Stabilization (PIMS) treatability study on excavated lead-contaminated soils at SWMU B-20 funded under delivery order (DO) 5084 was continued during Quarter 12. Initial results of the treatability study, which is being conducted by UFA Ventures and Environmental Security Technology Certification Program (ESTCP) with support from Parsons, are further discussed under Task VI (Treatability Studies). The UFA Ventures treatability study will be incorporated into Volume 4 of the CSSA Environmental Encyclopedia. The PIMS field scale treatability study monitoring efforts are expected to continue through August 2002. A final report of the PIMS treatability study is expected in September 2002. Sampling and monitoring of the treated soils at SWMU B-20 were continued with the monitoring of lysimeters that allow collection of rainwater from the site. |
Percent Complete
This task makes up approximately 7 percent of the IM phase and is 99 percent complete, based on the interim measures defined in the 3008(H) Administrative Order on Consent, located in Volume 1, Scoping Documents. Other investigation activities to be conducted are further discussed under RFI activities, Investigation, Treatability Studies, etc., in the sections below. If further interim measures WPs are added to the scope of work in the future, the percent complete as stated will be adjusted.
Task II - Interim/Stabilization Measures Implementation
Task Description
SWMU O-1 (closed) – This task included excavation and removal of contaminated soil related to SWMU O-1, collection and analyses of confirmation samples, backfilling with clean fill material, installation of clay cap, and completion of the closure report. The fieldwork for this task was completed in August 2000. The closure report was completed in October 2000. The Texas Natural Resource Conservation Commission (TNRCC) approved the SWMU O-1 closure on December 3, 2001.
Groundwater Sampling (complete) – This task included one round of groundwater sampling for all on-post monitoring wells and selected off-post water wells sampled in 1995. This sampling and analysis was complete in December 1999.
Off-post Well Survey (complete) – This task included identifying and locating all water wells within ¼-mile of the CSSA boundaries. The final report was issued in August 2001 and is located in Volume 5, Groundwater. Since this report was completed, two new private wells were identified at a distance greater than ¼-mile from the post boundary. These wells include OFR-3 and I10-7. OFR-3 was initially sampled in October 2001 and has been equipped with a granular activated carbon (GAC) filter system due to elevated levels of volatile organic compounds (VOCs). I10-7 was sampled for the first time in March 2002. Additional wells and associated data are being tracked by both CSSA and Parsons.
The Draft Soil Pile Disposition Assessment Report was completed, along with the initiation of bench-scale studies of other treatment technologies (e.g., density treatment, phytoextraction, etc.) during Quarter 12. Upon completion of the treatability studies on the subject soils, a final recommended disposition will be made. Planning and implementation of the final remedy will proceed once the final remedy has been selected for the excavated soils at SWMUs B-8, B-24, B-28, and DD. Soils from SWMU B-20 are being addressed under the PIMS Stabilization Treatability Study.
This task makes up approximately 70 percent of the IM phase. This task is considered 28 percent complete, based on the current projected activities listed in Task II, Task Description. If investigation results at other sites indicate an immediate threat to human health or the environment so that IM activities are warranted at additional sites, the percent complete will be adjusted accordingly.
No changes have occurred from the Summary of Findings reported in previous quarterly progress reports. New findings include:
Leachate monitoring samples were taken from the SWMU B-20 soils that were treated with the PIMS Apatite II mineral. Samples were analyzed by APPL, Inc. (APPL) and indicate that there is no soluble lead available in the leachate. Analytical results for total lead after filtration were non-detect. Bioassessment of soils were conducted on PIMS treated and untreated soils from SWMU B-20 site. Results of the bioassessment analyses will be received in the next quarter.
No changes associated with Interim/Stabilization measures implementation occurred this reporting period.
UFA Ventures personnel accompanied Parsons in collecting two leachate samples. Samples of leachate generated at SWMU B-20 were collected on July 10, 2002. The samples were analyzed for total metals of concern at CSSA. Results are expected in the next quarterly reporting period.
No problems associated with IM activities occurred during this reporting period.
No actions to correct problems associated with IM activities were necessary this reporting period.
Contractor procurement activities associated with treatability studies for the soil piles continued in Quarter 13. These duties include generation of detailed statements of work for soliciting proposals for the planned treatability studies. Procurement of subcontractor services for the planned treatability studies at SWMUs B-8, B-24, B-28, and DD are expected to be complete during the next reporting period.
CSSA will continue with O&M activities for SWMU O-1 until a final remedy for the associated vadose and groundwater zone is complete. These continued O&M activities include watering the cap to maintain vegetative cover.
O&M activities associated with the PIMS treatability study are expected to continue through the next quarter. Activities include monitoring of leachate generated at the test sites and maintenance of vegetative cover at the SWMU B-20 test site.
Copies of Daily Reports, Inspection Reports, Data, etc.
There were no reports provided during this quarter.
Task Description
Reports associated with the IM include quarterly progress reports, environmental cleanup reports, groundwater monitoring reports, and an interim/stabilization measure report. This quarterly progress report is submitted as part of this task.
The IM Report will be in three phases. The first phase will be a baseline report, the second phase will be a progress report, and the third phase will be a final report upon completion of the project. Funding for the first two phases will be completed in the next fiscal year. Currently it is uncertain if the budget for the next fiscal year will fully fund the third phase, and may carry over to the following fiscal years.
Activities this Quarter
IM activities are reported in this Quarterly Progress Report. No reports for the IM portion of the work were generated this quarter.
This task makes up approximately 23 percent of the IM phase. This task is approximately 62 percent complete based on the current projected activities listed in Task III, Reports, Task Description. If investigation results at other sites indicate an immediate threat to human health or the environment so that IM activities are required at additional sites, the percent complete will be adjusted accordingly.
No findings associated with progress reports or IM reports are submitted this reporting period.
No changes associated with progress reports or IM reports occurred this reporting period.
No contacts related to quarterly progress reports or IM Reports were made during this reporting period.
No problems were associated with Interim Measures reporting this quarter.
No actions to correct problems associated with IM reporting were necessary this reporting period.
Preparation of the treatability studies associated with determining the proper disposition of subject soils will be continued in Quarter 14.
Copies of Daily Reports, Inspection Reports, Data, etc.
No daily reports, inspection reports, or data related to the IM report were generated during this reporting period.