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20th Quarter - Final Quarterly Progress Report

Interim/Stabilization Measures

I/SMs are being conducted to mitigate a current or potential threat to human health and/or the environment. I/SMs are estimated to represent approximately 30 percent of the required actions at CSSA. The I/SMs include I/SM WP (7 percent of IM), I/SM Implementation (70 percent of IM), and Reports (23 percent of IM). Based on information currently available at the end of Quarter 20, the I/SMs are approximately 75 percent complete.

Task I - Interim/Stabilization Measures Work Plan

Task Description

The I/SMs WP includes:

  1. A description of on-going and planned I/SMs;

  2. A statement of the objectives of each I/SM, 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

  3. Proposed locations, design plans and specifications, construction, and operation and maintenance (O&M) requirements of the I/SMs, including a sampling and analysis plan (SAP).

Existing plans, which are included in CSSA’s Environmental Encyclopedia, are referenced to the extent possible.

I/SMs 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 I/SMs at SWMU O-1; closure of SWMU O‑1; characterization and determination of proper disposition of soil piles at SWMUs B-8, B-20, B-24, B-28, and the Demolition Dud (DD) Area; and implementation of the identified disposition method. Of the tasks listed, all have been completed with the exception of the soil pile work. In addition, continuation of on- and off-post groundwater sampling and analysis is being performed under the RFI phase of this project.

The Final Soil Pile Disposition Assessment (SPDA) Report was submitted in August 2003. A proposed disposition method of soil phosphate stabilization and on- and off-post disposal was identified in the assessment. A Treatability Study/field demonstration of the proposed remedy was completed in January 2004. Final implementation of the disposition is not fully funded; however, the soil pile at SWMU DD (approximately 280 yd3) has been removed and properly disposed at Covel Gardens Landfill, San Antonio, Texas. Due to the volume of soil in the remaining soil piles (estimated at approximately 6,700 yd3), and the need to address other more urgent environmental concerns, it is anticipated that funding may spread over several years.

Activities this Quarter

Efforts relating to the determination of proper disposition of previously sifted soil piles at SWMUs B-8, B-20, B-24, and B-28 funded under RL83 were completed in Quarter 20. The final SPDA Report was completed and included in Volume 4 of the CSSA Environmental Encyclopedia during Quarter 18. A bench-scale study using Phosphate-Induced Metal Stabilization (PIMS) for stabilization of contaminated soil media was completed during Quarter 20 for SWMUs B-20, B-24, and B-8.

The PIMS treatability study on excavated lead-contaminated soils at SWMU B-20 was completed during Quarter 20. Final results of the treatability study, which is being conducted by UFA Ventures, Inc., (UFA) through the Environmental Security Technology Certification Program (ESTCP) with support from Parsons, are further discussed under Task VI (Treatability Studies). The UFA final treatability study reports were incorporated into Volume 4 of the CSSA Environmental Encyclopedia during Quarter 20.

Percent Complete

The I/SM WP task makes up approximately 7 percent of the I/SM phase and is 100 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 I/SM 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 I/SMs and Closure (complete) –The Texas Commission on Environmental Quality (TCEQ) (formerly known as the Texas Natural Resource Conservation Commission [TNRCC]) approved closure of the land-based portion of SWMU O-1 on December 3, 2001. Further investigation and possible remediation of the vadose zone and groundwater beneath SWMU O-1 will be conducted in future quarters. This I/SM task is complete.

Initial On- and Off-Post Groundwater Sampling (complete) – Periodic sampling of on-post wells was initiated in 1991. Off-post water sampling began in 1995. Quarterly sampling of both on- and off-post wells began in 1999. This I/SM task is complete. Quarterly groundwater monitoring continues as part of the RFI task.

Off-post Well Survey (complete) – The final report was issued in August 2001 and is located in Volume 5, Groundwater of the Environmental Encyclopedia. This task is complete.

SPDA and Implementation (in progress) –- A bench-scale study of potential treatment technology (i.e., PIMS) was completed during Quarter 20. A final disposition will be recommended for excavated soil piles at SWMUs B-8, B-24, and B-28. Planning and implementation will proceed once the final remedy has been selected for the excavated soils at SWMUs B-8, B-24, and B-28, and funding is available. Soils from SWMU B-20 are already being addressed under the PIMS Stabilization Treatability Study (Task VI, RCRA Facility Investigation). As part of the treatability studies for the soil pile disposition assessment, an additional 22 tons of PIMS Apatite II material was purchased for stabilizing SWMU B-8 soils. The soils at SWMU DD were determined by waste characterization analyses to meet non-hazardous class 2 criteria per 30 TAC 335 subchapter R. Therefore, the soils did not require further treatment and were removed and taken to the Waste Management Inc. (WMI) Covel Gardens Landfill facility in San Antonio, TX. The removal action was accomplished in order to gain closure of the site under the State of Texas Risk Reduction Rules.

  1. Percent Complete

The I/SM Implementation task makes up approximately 70 percent of the I/SM phase. This task is considered 60 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 which warrant IM, the percent complete will be adjusted accordingly.

  1. Summary of Findings

Additional analytical data for SWMU B-24 were generated during Quarter 20. Thirteen samples of the soil piles and bottom of excavation were collected and analyzed for TCLP lead, for waste characterization purposes. Analyses conducted to date support that the SWMU B‑20, B-28, and approximately 80% of the B-24 soils can be disposed as Class 2 non-hazardous soil media. Approximately 2,000 cubic yards of soil located at SWMU B‑24 meet the State of Texas Class 1 non-hazardous criteria.

  1. Summary of Changes

No changes associated with I/SM implementation occurred this reporting period.

  1. Summary of Contacts

No contacts occurred during this reporting period.

  1. Summary of Problems

No problems associated with I/SM activities occurred during this reporting period.

  1. Actions Taken to Correct Problems

No actions to correct problems associated with I/SM activities were necessary this reporting period.

  1. Projected Work for the Next Quarter

CSSA will continue with O&M activities for SWMU O-1 until a final remedy for the associated vadose and groundwater zone is complete. The continued O&M activities include maintaining the vegetative cover.

Monitoring of leachate generated at the test sites and maintenance of vegetative cover at the SWMU B-20 test site will continue.

A proposal was provided to ESTCP to continue the field demonstration of PIMS during 2005 and 2006. The proposal is to study the uptake of treated lead contaminated soil in humans (Dr. Joseph Grazianio’s in vivo study) and correlate the results using and Mr. Mike Ruby’s in vitro method. The proposal is to help substantiate that human health and the environment will not be adversely affected by leaving PIMS-treated soils from SWMU B-20 on site.

  1. Copies of Daily Reports, Inspection Reports, Data, etc.

There were no reports provided during this quarter related to I/SM.

Task III - Reports

Task Description

Reports associated with the I/SM include quarterly progress reports, environmental cleanup reports, groundwater monitoring reports from one sampling event, and an I/SM report. This quarterly progress report is submitted as part of this task.

Reports required under the I/SM section of the Order are submitted in three phases. The first phase is a baseline report, the second phase are progress reports, and a final report upon completion of the project. This quarterly progress report fulfills the requirement for an I/SM progress report for activities including long-term operation, maintenance, and monitoring at CSSA.

Activities this Quarter

I/SM activities are reported in this quarterly progress report. There were no final reports for the I/SM portion of work generated this quarter.

  1. Percent Complete

This task makes up approximately 23 percent of the I/SM phase. This task is approximately 94 percent complete based on the current projected activities listed in Task III, Reports. If investigation results at other sites indicate an immediate threat to human health or the environment so that I/SM activities are required at additional sites, the percent complete will be adjusted accordingly.

  1. Summary of Findings

No findings associated with progress reports or I/SM reports are submitted this reporting period.

  1. Summary of Changes

No changes associated with progress reports or I/SM reports occurred this reporting period.

  1. Summary of Contacts

No contacts related to quarterly progress reports or I/SM Reports were made during this reporting period.

  1. Summary of Problems

No problems were associated with I/SMs reporting this quarter.

  1. Actions Taken to Correct Problems

No actions to correct problems associated with I/SM reporting were necessary this reporting period.

  1. Projected Work for the Next Quarter

I/SM activities in Quarter 21 will be reported in the next Quarterly Progress Report.

  1. Copies of Daily Reports, Inspection Reports, Data, etc.

No daily reports, inspection reports, or data related to the I/SM report were generated during this reporting period.

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