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26th 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, identify actual or potential receptors, and assess whether any additional I/SM may be warranted. The RFI is estimated to represent approximately 30 percent of the required actions at CSSA. The RFI includes a Preliminary Report (5 percent of RFI), RFI WP (10 percent), Facility Investigation (45 percent), Human Health and Ecological Risk Assessment (15 percent), Investigation Analysis (10 percent), Treatability Studies (10 percent), and Progress Reports (5 percent). As of the end of Quarter 26, the RFI is approximately 71 percent complete.

Task I: Preliminary Report: Description of Current Conditions

Task Description

This task included preparation of the DCC Report. The DCC Report included 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 was included in the DCC Report. CSSA’s Environmental Encyclopedia was used to meet the DCC Report submittal requirements. The final DCC Report was submitted to the EPA and TCEQ on August 1, 1999. No regulatory comments on the report were received. This task makes up approximately 5 percent of the RFI phase, and is 100 percent complete.

Activities this Quarter

No activities associated with the DCC were conducted this Quarter.

Task II: RFI Work Plan

Task Description

The Order requires that the RFI WP task include a Project Management Plan, Data Collection Quality Assurance Plan, Health and Safety Plan (HSP), and a Community Relations Plan (CRP). As previously agreed by EPA, CSSA’s Environmental Encyclopedia has been used to fulfill this requirement. The Environmental Encyclopedia includes all information required by the Order. Completion of this task is funded for the planned RFI tasks.

Activities this Quarter

An update to the December 2002 CRP was submitted previously. Approximately 70 community members were contacted to request an interview regarding CSSA’s community relations program. This led to 15 interviews. The draft CRP was submitted June 15, 2005, to CSSA and AFCEE for review and comment. No CSSA comments have been provided to Parsons.

Task Order (TO) 0006 was awarded during Quarter 22. Preparation of WPs for TO0006, including WP addenda, SAP addenda, HSP addenda, and a construction quality plan were completed during Quarter 25. The Outfall 01 Reuse Design WP was submitted May 20, 2005. CSSA determined that reuse of effluent from Outfall 01 was not practical, and requested that the design work plan be revised to change the disinfection of the discharged effluent from chlorine gas to a liquid or tablet bleach system due to safety concerns. The HSP was submitted as Final June 7, 2005. A draft work plan for performance of the Enhanced Anaerobic Bioremediation (EAB) utilizing an injected substrate into the aquifer underlying SWMU B-3 was submitted to the government for review on July 29, 2005, and comments were received on October 12, 2005. Modification 02 to TO0006 was awarded during Quarter 26. Modification 02 includes removal of waste from SWMU B-3 and the subsequent construction of a bioreactor cell in the excavated trench. The activities planned under Modification 02 were incorporated into revised work plan documents this Quarter.

  1. Percent Complete

The RFI WP task makes up approximately 10 percent of the RFI phase. Estimation of percent complete is difficult due to the continuing need for plan addenda as new projects are planned. As of the end of Quarter 26, WPs currently under scope are 95 percent complete. The CSSA Environmental Encyclopedia will continue to be updated as WPs for the new task orders are finalized.

Task III: Facility Investigation

Task Description

An investigation of the facility is being conducted to:

  1. Characterize the environmental setting of the facility;

  2. Define the source(s) of contamination;

  3. Define the nature and extent of contamination; and

  4. Identify actual or potential receptors.

In some cases, multiple investigational phases may be necessary. The investigation results will be used to develop and evaluate alternatives during the Corrective Measures Study (CMS). All investigation activities are being conducted in accordance with the RFI WP.

Completion of this task is partially funded for the planned RFI tasks. Attachment 2 indicates the sites for which investigations have been initiated and site status as well as sites that have been identified, but not yet investigated.

Activities this Quarter

The majority of current ongoing environmental activities at CSSA are part of the RFI task. Work on each of these tasks is described in the following paragraphs. The main areas of work this Quarter included groundwater monitoring of on- and off-post wells and Westbay® wells, analytical data verification and validation, closure activities at several SWMUs and AOCs, Building 90/AOC‑65 investigations, SVE system operation and expansion, completion of the East Pasture clearance project, NEPA/miscellaneous environmental services, SWMU B-3 removal action and bioreactor planning, and various miscellaneous tasks.

Groundwater Monitoring

There are a total of 41 wells at CSSA. Three are drinking water wells, three are former livestock wells and 35 are used as monitoring wells. These wells are monitored as set out in the data quality objectives (DQOs) for the Groundwater Monitoring Program. In addition, there are four Westbay® multi‑port wells that are sampled on a monthly basis in accordance with the DQOs. Sampling of all on‑post and selected off‑post wells is conducted quarterly. Sampling of off-post wells is conducted in accordance with the DQOs and the Off-Post Monitoring Response Plan (CSSA, 2002).

Off‑post wells were sampled from September 19 - 22, 2005. Twenty-seven private and public off‑post drinking water wells were sampled. The locations of these wells are shown on Attachment 1. All samples were collected from ports located near the wellhead. Samples were analyzed by Agriculture & Priority Pollutants Laboratories, Inc. (APPL) for the EPA‑approved short list of volatile organic compounds (VOCs) from the project DQOs. The VOC short list includes 1,1‑dichloroethene (1,1‑DCE), bromodichloromethane, bromoform, chloroform, cis‑1,2‑dichloroethene (cis‑1,2‑DCE), dibromochloromethane, dichlorodifluoromethane, methylene chloride, naphthalene, tetrachloroethene (PCE), trichloroethene (TCE), toluene, trans‑1,2‑dichloroethene (trans‑1,2‑DCE), and vinyl chloride. Parsons received preliminary data for these samples on October 13, 2005. Data validation and verification for these samples were initiated and Parsons’ chemists submitted these data packages to AFCEE and Portage Environmental this Quarter.

Quarterly groundwater monitoring of on‑post monitoring and drinking water wells was performed on September 6 – 15, 2005. Thirty-one on-post monitoring wells and eight CSSA livestock and drinking water wells were sampled. Well CS-MW16-CC was not sampled this quarter due to an interruption in the electrical supply. Locations of the on‑post wells sampled are shown on Attachment 1. Samples were analyzed by Severn Trent Laboratories (STL) for the short list of VOCs, in accordance with the groundwater DQOs. Parsons received the preliminary data packages from September 27 October 4, 2005. Data validation for VOCs and metals was performed this Quarter and Parsons’ chemists submitted these data packages to AFCEE and Portage Environmental on October 5, 2005.

The draft Off-Post Quarterly Groundwater Monitoring Report for June 2005 was submitted to CSSA and AFCEE for review on August 16, 2005. CSSA comments were provided on October 12, 2005, and responses to comments are being prepared. The draft On-Post Quarterly Groundwater Monitoring Report for June 2005 was submitted to CSSA and AFCEE for review on August 23, 2005. CSSA comments were received on October 12, 2005, and responses to comments are being prepared.

Westbay®‑Equipped Well Sampling Events

Formation pressures in each sample zone were profiled monthly and zones with groundwater were sampled two times this quarter. Sampling was conducted for the Westbay® multi‑level wells (CS‑WB01, CS-WB02, CS‑WB03, and CS‑WB04) from August 29 - 30, 2005 and
October 19 and 20, 2005. Each well zone was hydraulically profiled and discrete samples were collected from groundwater‑bearing intervals. The samples were submitted to DHL Analytical for VOC analysis. Results will be presented in the September 2005 On-Post Quarterly Groundwater Monitoring Report currently being drafted.

Off‑Post GAC Systems

Based on sampling results received in 2001 and 2002 indicating VOC levels above or approaching the maximum contaminant level (MCL), granular activated carbon (GAC) filtration systems were installed at seven off‑post wells. In accordance with the CSSA Off‑Post Monitoring Program Response Plan dated June 2002, the off‑post GAC wellhead treatment systems are maintained by CSSA. Monthly O&M activities for the off‑post residential GAC treatment systems were performed this Quarter. Work included inspection and replacement, as needed, of the pre‑ and post‑GAC filters at wells LS‑6, LS‑7, RFR‑10, RFR‑11, and OFR‑3. Confirmation post‑GAC samples were collected from these wells during September 2005. Based on the preliminary results, no post‑GAC samples had concentrations above the MCL for PCE, TCE, or cis‑1,2‑DCE. In addition, carbon from the LS-2/LS-3 GAC system was removed and replaced from September 27 – 29, 2005. Approximately 5,000 pounds of spent carbon was sampled for characterization and will be regenerated for future use. Confirmation samples collected after carbon exchange confirmed the system was working effectively. The next post‑GAC sampling event will be conducted in March 2006.

On‑Post GAC Systems

Parsons operated and maintained the on-post GAC unit this Quarter, and prepared a Discharge Monitoring Report (DMR) each month to comply with TPDES permit requirements. From August to October 2005, approximately 28,800 gallons of water containing VOCs were treated by GAC and discharged from Outfall 002.

Data Validation and Verification

Laboratory results from sampling efforts and investigations are validated and verified by Parsons’ chemists to ensure results are in compliance with CSSA Quality Assurance Program Plan (QAPP) requirements. Data validation and verification continued during Quarter 26 under CSSA projects TO0006, TO0008 and TO0019.

Parsons received 28 data packages during Quarter 26, nine related to TO0006 sampling activities, eight related to quarterly groundwater monitoring activities, three related to outfall sampling, and one Westbay® data package. The Westbay® multi‑port groundwater sampling, TO0006 sampling and outfall monitoring are verified as screening‑level data. The nine TO0006 data packages were received from Gulf Coast Analytical Laboratories (GCAL). All other data packages were validated and verified in accordance with specific project DQOs and the CSSA QAPP. Parsons will submit data packages for TO0008 #165 – #174 this Quarter to AFCEE for review.

RCRA Facility Investigations/Closures of SWMUs and AOCs

A total of 84 SWMUs, AOCs, and Rifle Management Units (RMUs) have been identified at CSSA and investigations have been conducted at 64 of those sites. A summary of the status of each site, including whether the site is recommended for closure or if closure is approved, is provided in Attachment 2. TCEQ approved RRS1 closures of SWMUs B-12, B-23, B-25, Building 43, AOC-46, AOC-53; delisting of AOC-44, AOC-49, and AOC-60; and no further action at AOC‑41 during Quarter 26. To‑date, RRS1 closure of 34 CSSA sites has been approved by TCEQ and eight sites were either delisted or granted no further action status. Twenty-three of the sites were closed under TO0019, either by delisting, Risk Reduction Standard 1 (RRS1) closure, or being granted No Further Action (NFA) status.

CSSA sought to close most of its sites under RRS1. The deadline for submission of site closures under Risk Reduction Rules (RRR) to TCEQ was May 1, 2005. Closure reports were submitted for 24 sites by this date. Fifteen sites have received RRS1 closure, three have been granted NFA status, and five have been delisted.

All work performed under TO0019 during Quarter 26 has been guided by the Texas Risk Reduction Program (TRRP) rules and comparison criteria. Plans were developed during Quarter 26 for the transition to TRRP and determination of the most efficient manner to close remaining sites. Responses to TCEQ’s comments on the B-29 closure report were also initiated this period.

Hydrogeologic Conceptual Site Model

A draft version of the CSSA Hydrogeologic Conceptual Site Model (CSM) was submitted to AFCEE and CSSA for internal review on January 27, 2004. The draft Final Hydrogeologic CSM was submitted to AFCEE and CSSA on May 27, 2005. Comments on the Draft Final CSM were submitted October 24, 2005. The Final CSM will be completed by November 23, 2005.

LTMO Optimization Recommendations

Long term monitoring optimization (LTMO) is used to provide an opportunity to identify cost savings, evaluate redundancy in sampling programs and avoid inefficiencies in long term monitoring programs. A 3-Tiered LTMO approach was applied to the CSSA groundwater monitoring program to evaluate the distribution and frequency of groundwater sampling. The combined qualitative, temporal & spatial statistical approach identified a 57% potential reduction for on and off-post monitoring well sampling events and an 88% potential reduction for Westbay-equipped well sampling events. The LTMO recommendations were submitted to EPA and TCEQ for review and comment on May 18, 2005. No comments from the regulatory agencies had been received at the end of Quarter 26.

East Pasture Clearance Project

An ordnance removal action was conducted in the East Pasture prior to construction of new range facilities. No unexploded ordnance items were discovered during intrusive investigations, but several pieces of ordnance and explosive scrap were found. Twenty-five acres were surveyed, but only five acres in and around future building footprints were cleared. One hundred and ninety-two anomalies were investigated.

Although white phosphorous was a concern at the site, none was encountered during the intrusive investigations. No waste was generated; therefore, no transportation and disposal was necessary. All metal scrap was recycled and other trash items were disposed. Additional UXO clearance in the East Pasture is planned for the next quarter. A report summarizing all of the East Pasture investigation results will be prepared.

SWMU B-3 Removal Action and Bioreactor/EAB Treatability Testing

Parsons completed the drilling and testing of four boreholes drilled for installation of the Westbay® wells and one borehole drilled for the injection test. Drilling of the four boreholes was completed on August 15, 2005, and FLUTe installations were performed throughout the process to ensure borehole integrity protected when not performing tests. The retrieval mechanisms for two of the FLUTe liners malfunctioned, and were replaced by the manufacturer.

Borehole geophysical testing and groundwater/soil gas packer testing was performed on each of the Westbay® wells starting on August 12 and was completed on August 26, 2005. Data collected from the groundwater packer testing and borehole geophysical testing at WB-05 (located between SWMU B-3 and CS Well 16-LGR) were evaluated and a technical recommendation was presented to CSSA for injection well location and injection intervals. Following approval of the recommendations, the injection well was constructed in September 2005. The technical memorandum providing the basis for the location and injection intervals for the enhanced anaerobic bioremediation pilot study is presented in Attachment 4 to this report.

The borehole core logs, video, and geophysical results of all four Westbay® wells were evaluated following completion of the field work, and designs for the multi-level monitoring ports were developed. A technical memorandum providing recommended intervals, port placement, and technical basis was prepared for presentation to CSSA for comment and concurrence. The technical memorandum for the Westbay® well designs is being prepared this Quarter. Installation of the multi-port intervals was also scheduled with Westbay® and is set to begin at the beginning of next period (November 2005). This technical memorandum is included as part of Attachment 4.

A permit application was also prepared for re-injection of untreated groundwater from CS‑Well 16-LGR into the injection well. CSSA submitted the application to TCEQ on October 18, 2005.

Miscellaneous

Letters summarizing the results of the June 2005 off‑post groundwater monitoring event were mailed to the owners of the off‑post wells on August 26, 2005. A draft Fact Sheet 23 summarizing the June 2005 groundwater monitoring results was submitted to CSSA and AFCEE for review during Quarter 26. The Final Fact Sheet will be distributed during Quarter 27.

The CSSA website was updated with documents added to the Environmental Encyclopedia through the end of October 2005. The website includes CSSA’s Administrative Record as required under the Order. Parsons continued to update the internal version of the electronic encyclopedia and hard‑copy with all final reports through October 2005. Updates made in Quarter 26 included the following:

TO 0006 Health and Safety Plan Addendum, June 2005;

March 2005 On-Post Groundwater Monitoring Report, July 2005;

Air Permit Renewal Application;

Well owner letters for June 2005;

Well owner letters for March 2005; and

Well owner letters for December 2004.

  1. Percent Complete

The RFI Facility Investigation subtask makes up approximately 45 percent of the RFI phase. As of the end of Quarter 26, this task is approximately 63 percent complete.

  1. Summary of Findings

Groundwater Monitoring

Quarterly groundwater monitoring for both on‑ and off‑post wells was performed at CSSA from September 6 – 15, 2005. A map of the well locations sampled is provided on Attachment 1 of this report. CSSA sampled twenty-seven private and public off‑post wells, thirty-six on-post monitoring and/or livestock wells and three on-post drinking water wells during Quarter 26. Results will be formally reported in the draft September 2005 Quarterly Groundwater Monitoring Reports to be submitted to CSSA and AFCEE for review and comments during Quarter 26.

Building 90/AOC‑65 Investigation

The AOC-65 SVE systems were operated periodically throughout Quarter 26. On July 8, 2005, a sampling event was performed on each of the SVE wells located inside Building 90. The sampling was conducted to obtain data on the removal rates of contaminants from each individual extraction well. The data will be used to adjust the extraction wells to optimize contaminant mass removal.

SWMU B-3 Removal Action and Bioreactor/EAB Treatability Testing

Drilling of the multi-port monitoring wells at SWMU B-3 was initiated on July 25, 2005. These wells will be used to monitor the groundwater underlying SWMU B-3 bioreactor and the pre-removal action enhanced anaerobic bioremediation pilot study. Attachment 4 includes the well log for WB-05. A total of four well boreholes were drilled and borehole geophysical testing and groundwater/soil gas packer data was collected as part of the installation activities. Technical memorandums for the injection well location and screened interval and the Westbay® multi-port well designs are part of Attachment 4 and the preliminary results of the data collected are also summarized in Attachment 4.

  1. Summary of Changes

No changes to the RFI were made during this Quarter.

  1. Summary of Contacts

CSSA received several letters from the TCEQ during Quarter 26. The following correspondence was submitted to and/or received from TCEQ or EPA:

August 12, 2005 TCEQ Compliance Evaluation Inspection Summary of Investigation Findings;

August 12, 2005 CSSA submittal of Renewal Operating Permit Application;

August 24, 2005 TCEQ approval of Building 43 RRS1 Closure;

September 9, 2005 CSSA request for Section 106 review regarding renovations to Building 1, 41, and 47;

September 12, 2005 TCEQ approval of December 2004 On-Post Groundwater Monitoring Report;

September 12, 2005 TCEQ approval of December 2004 Off-Post Groundwater Monitoring Report;

September 19, 2005 CSSA response to Compliance Evaluation Inspection on July 5-6, 2005.

September 26, 2005 CSSA request to implement LTMO recommendations for Groundwater Monitoring On-Post Only;

October 11, 2005 CSSA follow up to Building 40 letter; and

October 11, 2005 Submittal to TCEQ of Permit WQ000384 9000.

Copies of all correspondence are included in Volume 1‑7 of the Environmental Encyclopedia.

Two meetings were held at the TCEQ Office during this quarter. One meeting was held between TCEQ personnel Abigail Powers and Jorge Salazar and CSSA representatives Glare Sanchez, Tom Tijerina, and Brenda Shirley on September 6, 2005. A meeting was also held on October 13, 2005 at CSSA with Sonny Rayos, Abigail Powers, CSSA representatives Chris Beal, Brenda Shirley, Glaré Sanchez, Jeff Aston, and Parsons representatives Ken Rice, Eric North, Kimberly Vaughn, Julie Burdey, and Brian Vanderglas. The purpose of the first meeting was to discuss TCEQ’s response letter dated March 31, 2005 regarding CSSA RFI and Interim Measures Waste Management Plan. CSSA submitted a draft response to TCEQ on October 13, 2005. The purpose of the second meeting was to provide TCEQ with a summary of the LTMO recommendations, describe upcoming treatability study and remedial activities at SWMU B-3, and to discuss CSSA’s transition to the Texas Risk Reduction Program for future site closures.

  1. Summary of Problems

No significant problems were encountered during this Quarter.

  1. Actions Taken to Correct Problems

No actions to correct problems necessary.

  1. Projected Work for the Next Quarter

Fact Sheets

Fact Sheet 23, drafted in Quarter 25, will be distributed to area residents reporting on the June 2005 groundwater monitoring in Quarter 26. Upon completion of the Technology Evaluation Report for AOC-65, a new Fact Sheet will also be prepared for distribution to the neighborhood covering the topic of investigation and remedial action progress at AOC‑65 under TO0058. A separate Fact Sheet to present the results of the LTMO study was discussed with EPA to educate area residents on the justification for reduced well sampling frequencies in the future. These fact sheets will be drafted following approval of the LTMO study by EPA and TCEQ.

Groundwater Monitoring

Draft September 2005 On- and Off-Post Groundwater Monitoring Reports will be submitted to CSSA and AFCEE for review in Quarter 26. The LTMO study, which was submitted for comments and review on May 18, 2005, will be implemented after approval by the regulators. Westbay® monitoring frequencies may be modified in the future for on- and off-post wells based on the recommendations of the LTMO study and the concurrence of regulators. On- and off-post quarterly groundwater monitoring will continue in December 2005.

O&M at the residential GAC filtration systems (LS‑6, LS‑7, OFR‑3, RFR‑10, and RFR‑11) and public water supply systems (LS‑2/LS‑3) will be conducted monthly during Quarter 27. The Westbay® wells will be profiled and sampled once per month for the foreseeable future, including Quarter 27. Monitoring frequencies may be modified after December 2005 based on the recommendations made in the LTMO study and the concurrence of regulators.

SWMU and AOC RFI/Closure Reports and Planned Closure Projects

Closure/characterization work will be continued for SWMUs and AOCs during Quarter 27. All RRS1 closure, delisting, and NFA reports were submitted to TCEQ by May 1, 2005. Responses to TCEQ requests for additional information regarding these reports will be provided as necessary during Quarter 27. In addition, prioritization of remaining open sites will be initiated.

East Pasture Removal Action Project

The removal action report for the East Pasture will be finalized.

SWMU B-3 Removal Action and Bioreactor/EAB Treatability Testing

Construction of the four multi-port monitoring wells around SWMU B-3 will be completed next quarter. After the wells are in placed and baseline sampling data collected, pumping tests at CS-Well 16 CC are planned, followed by initiation of the enhanced anaerobic bioremediation pilot study.

The work plan addenda for TO 0006 will be revised to include the removal action activities planned at SWMU B-3, and construction of the bioreactor in the open excavation, and upon approval, a removal action contractor will be procured to perform the construction activities. Removal actions for the contents of the SWMU B-3 trenches are tentatively planned to begin in January 2006 with an estimated duration of 4 months to complete the removal action and construction of the bioreactor.

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

Quarterly groundwater sampling reports summarizing the most recent groundwater findings are periodically submitted after all data has been reviewed and verified. The quarterly groundwater monitoring reports present the groundwater elevations recorded (on‑post wells only) and the analytical results received for each well (on‑ and off‑post). The groundwater elevations are presented in the On‑Post Quarterly Groundwater Monitoring Reports on a potentiometric surface map and in tabular format. Analytical results from the most recent sampling events are compared to levels from the previous quarters, while comprehensive historical analytical results can be found in tables which are revised quarterly and presented in the Introduction to the Quarterly Groundwater Monitoring Program, Volume 5, Groundwater. Reports for each previously conducted quarterly monitoring event are also located in Volume 5, Groundwater, behind the On‑Post Groundwater Monitoring and Off‑Post Groundwater Monitoring tabs. Copies of these reports and analytical data are presented separately to the EPA by electronic version on CD-Rom, at the request of the EPA.

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 the 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 post‑wide human health and ecological 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.

This Risk Assessment subtask makes up approximately 15 percent of the RFI phase. The amount of effort needed to accomplish this task is not yet known because analytical data have not yet been fully evaluated. The percent complete will depend on the number of sites requiring risk assessment and is currently estimated at 98 percent.

Task V: Investigation Analysis

Task Description

This task includes preparation of an Investigation Analysis to support the selection of protection standards for CSSA. For sites closing under the State of Texas RRSs, this analysis was included as part of the RFI/Closure Report. Background levels were used to determine the possibility of closure under RRS1. At sites that did not close prior to the May 1, 2005 Risk Reduction Standard deadline, future work will be conducted under the Texas Risk Reduction Program (TRRP) (30 Texas Administrative Code [TAC] §350).

Activities this Quarter

No activities related to Investigation Analysis this Quarter.

  1. Percent Complete

The Investigation Analysis task makes up approximately 10 percent of the RFI phase, and is approximately 84 percent complete.

  1. Summary of Findings

As described in Task III, RFI reports are being completed for several sites. As part of the preparation of these reports, investigation results were compared to closure criteria. A summary of recommendations made for each site is provided in Attachment 2.

  1. Summary of Changes

No changes associated with the Investigative Analysis were made during this Quarter.

  1. Summary of Contacts

No contacts related to the Investigative Analysis were made during this Quarter.

  1. Summary of Problems

No problems related to the Investigative Analysis occurred during this Quarter.

  1. Actions Taken to Correct Problems

No actions to correct problems were necessary during this Quarter.

  1. Projected Work for the Next Quarter

Continued work on comparison of investigation results to closure criteria will be performed in Quarter 27.

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

No daily reports, inspection reports, or data related to investigation analysis/risk assessment were generated during this Quarter.

Task VI: Treatability Studies

Task Description

Funded activities include bench‑scale treatability studies for SWMU B‑20, SVE, and other treatability studies for treatment of the subsurface soils and bedrock at AOC‑65 and SWMU B‑3 if further contamination exists.

Activities this Quarter

O&M of the AOC‑65 SVE system was discontinued in Quarter 24, per the O&M plan. One year of continued O&M at both AOC‑65 and SWMU B‑3 is included in the new TO0006. The revised O&M plan was submitted to CSSA and AFCEE on June 30, 2005, and initial testing of the system per the draft O&M plan was performed in Quarter 25. A replacement blower was procured for the B-3 SVE system, and will be reconnected in Quarter 27. Re-initiation of the activities described in the updated SVE O&M plan will begin upon government approval of the plan.

The draft work plan for the SVE system upgrades for AOC-65 and SWMU B-3 was also prepared and submitted to CSSA and AFCEE for review. Installation of additional extraction wells are planned at both SWMU B-3 and AOC-65, with tentative expansion dates scheduled for January to March 2006.

  1. Percent Complete

The Treatability Studies task makes up approximately 10 percent of the RFI phase. The amount of effort needed to accomplish this task is not yet known because all pertinent data (e.g., analytical, physical, etc.) 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, but is currently estimated to be 40 percent complete.

  1. Summary of Findings

AOC‑65 SVE System

Samples were collected from the AOC‑65 SVE system in July 2005 for preliminary testing to assess the relative contribution of contaminant mass removal from the system. Data from the testing event indicated that mass removal rates from the subslab system are roughly the same order of magnitude as the removal rates measured toward the end of the previous year of O&M testing, or 10-20 pounds per year estimated.

SWMU B‑3 Preliminary Geologic and SVE Pilot Study Investigation

The blower at SWMU B-3 is currently out of service. No data was collected from the SWMU B‑3 SVE system during the subject reporting period. The blower motor will be replaced during Quarter 27.

  1. Summary of Changes

No changes to report this quarter.

  1. Summary of Contacts

No contacts were made regarding the treatability studies during the subject reporting quarter.

  1. Summary of Problems

No problems related to the treatability studies occurred during this Quarter.

  1. Actions Taken to Correct Problems

No actions to correct problems were necessary during this Quarter.

  1. Projected Work for the Next Quarter

O&M of the SVE systems at AOC‑65 and SWMU B‑3 will begin following approval of the revised O&M plan for AOC‑65 and SWMU B‑3. The O&M period for both SVE systems is projected to start in November 2005, pending approval of the O&M Plan, and successful replacement and startup of the new SWMU B-3 blower. The work plan for the SVE expansions will also be finalized in the next reporting period. Data from the Westbay® borehole drilling activities will be used to identify appropriate locations for new extraction wells.

Field scale treatability studies of PIMS for the previously sifted SWMU B-20 soil piles will continue in Quarter 26 as part of the treatability activities for the SPDA. Because this work is associated with the soil piles, it is included in the Interim Measures description.

Additional site investigations are subject to funding in current contracts.

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

No analytical data were submitted during this Quarter.

Task VII: Progress Reports

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 the quarterly progress report preparation task is partially funded. Twelve progress reports (December 2003 – October 2006) are funded under TO0005.

  1. Percent Complete

The Progress Reports task makes up approximately 5 percent of the RFI phase. The percent complete is unknown because the number of quarterly progress reports needed is currently unknown; however, it is estimated to be approximately 22 percent complete.

  1. Summary of Findings

No findings associated with the progress reports were made during this Quarter.

  1. Summary of Changes

No changes associated with the progress reports occurred during this Quarter.

  1. Summary of Contacts

No contacts relating to progress reports were made during this Quarter.

  1. Summary of Problems

No problems relating to progress reports occurred during this Quarter.

  1. Actions Taken to Correct Problems

No actions to correct problems were necessary during this Quarter.

  1. Projected Work for the Next Quarter

The Progress Report for Quarter 26 will be submitted.

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

No daily reports, inspection reports, or data related to the Progress Reports were generated during this Quarter.

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