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25th 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 25, 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 initiated this period.  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 and will be finalized during Quarter 26.

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.  No comments were received this Quarter. 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. Modification 02 to TO0006 was not awarded by the end of this Quarter.  Modification 02 will include removal of waste from SWMU B-3 and the subsequent construction of a bioreactor cell in the excavated trench. The work plan documents will be reviewed and updated as appropriate to incorporate the Modification 02 activities and associated data collection.

  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 25, WPs currently under scope are 99 percent complete. The CSSA Environmental Encyclopedia will continue to be updated as WPs for the new TOs 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, analytical data verification and validation, closure activities at several SWMUs and AOCs, Building 90/AOC‑65 investigations, SWMU B‑3 and AOC‑65 SVE system operation and expansion, 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.  

Off‑post wells were sampled from June 20 – 24, 2005.  Thirty-three 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 July 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 June 6 – 16, 2005. Thirty-two on-post monitoring wells and eight CSSA livestock and drinking water wells were sampled.  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 June 24 July 5, 2005.  Data validation for VOCs and metals was performed this Quarter and Parsons’ chemists submitted these data packages to AFCEE and Portage Environmental on July 25, 2005.

The draft Off-Post Quarterly Groundwater Monitoring Report for March 2005 was submitted to CSSA and AFCEE for review on May 20, 2005. CSSA comments were received on June 2, 2005, and the report was made Final on June 21, 2005. The draft On-Post Quarterly Groundwater Monitoring Report for March 2005 was submitted to CSSA and AFCEE for review on May 17, 2005. CSSA comments were received on June 2, 2005, and responses to comments were provided to CSSA on June 10, 2005. CSSA concurrence was received on July 12, 2005, and the report was issued as Final July 19, 2005.

Westbay®‑Equipped Well Sampling Events

Formation pressures in each sample zone were profiled monthly and zones with groundwater were sampled three times this quarter. Sampling was conducted for the Westbay® multi‑level wells (CS‑WB01, CS-WB02, CS‑WB03, and CS‑WB04) from May 23 – 25, 2005, June 29 – 30, 2005 and July 20 – 26, 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 June 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 (Plan), 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 and the LS‑2/LS‑3 municipal supply wells during March 2005. Based on the preliminary results, no post‑GAC samples had concentrations above the MCL for PCE, TCE, or cis‑1,2‑DCE during the March event. The next post‑GAC sampling event will be conducted in September 2005.

On‑Post GAC Systems

A long‑term pilot study to measure the effectiveness and capacity of well CS‑MW16‑CC was initiated at the end of February 2004 and continued through June 2005. Discharge rate, drawdown, and contaminant concentrations have been monitored throughout the duration of the pilot study. Pumping at well CS-MW16-CC halted in June 2005.

Parsons operated and maintained the on-post GAC unit, and prepared a Discharge Monitoring Report (DMR) each month to comply with TPDES permit requirements. From May to July 2005, approximately 798,000 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 25 under CSSA projects TO0008 and TO0019.

Parsons received 23 data packages during Quarter 25, seven related to quarterly groundwater monitoring activities, seven related to outfall sampling, two Westbay® data packages, two well development samples and five related to closure activities. The Westbay® multi‑port groundwater sampling and outfall monitoring samples are verified as screening‑level data.  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 #147 #154 and TO0019 #56 #60 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. 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. CSSA is awaiting comments from TCEQ for the remaining  reports submitted for sites SWMUs B-2, B‑29, Building 43, and AOC 55. 

All work performed under TO0019 during Quarter 25 has been guided by the Texas Risk Reduction Program (TRRP) rules and comparison criteria. During Quarter 25, soil investigations were conducted at SWMUs B‑2, B‑8, B‑28, and AOC‑51.  A brief summary of site progress follows:

SWMU B‑2:  Sampling was conducted to define the horizontal extent of lead contamination this Quarter.

SWMU B‑8:  Sampling was conducted to define the horizontal extent of lead contamination this Quarter.

SWMU B‑28:  Sampling was conducted to define the horizontal extent of lead contamination this Quarter.

AOC‑51:  Sampling was conducted during to determine the extent of contamination, if any, this Quarter.

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 Final Hydrogeologic CSM was submitted to AFCEE and CSSA on May 27, 2005.

LTMO Optimization Recommendations

Long term monitoring optimization (LTMO) is used to provide an opportunity to identify cost savings, inadequate sampling schemes 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 25.

Miscellaneous

Letters summarizing the results of the March 2005 off‑post groundwater monitoring event were mailed to the owners of the off‑post wells on May 27, 2005. Fact Sheet 22 covering the sampling conducted in March 2005 was mailed to all recipients on the CSSA mailing list during Quarter 25. Draft letters to well owners and a draft Fact Sheet 23 summarizing the June 2005 groundwater monitoring results will be submitted to CSSA and AFCEE for review during Quarter 26.

The CSSA website was updated with documents added to the Environmental Encyclopedia through the end of June 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 June 2005.  Updates made in Quarter 25 included the following:

CSSA Health and Safety Plan, April 2005;

Fact Sheet 21 and Fact Sheet 22;

Installation Environmental Noise Management Plan, June 2005;

SWMU B-3 Interim Remedial Action Completion Report, March 2005;

AOC 65 SVE Interim O&M Assessment Report, April 2005;

AOC 65 Treatment Evaluation Report, April 2005;

AOC 65 SVE Interim Treatability Report, April 2005;

March 2005 On-post Groundwater Monitoring Report; and

Various correspondence with regulatory agencies.

  1. Percent Complete

The RFI Facility Investigation subtask makes up approximately 45 percent of the RFI phase. As of the end of Quarter 25, this task is approximately 62 percent complete.

  1. Summary of Findings

Groundwater Monitoring

Quarterly groundwater monitoring for both on‑ and off‑post wells was performed at CSSA from June 6 23, 2005. A map of the well locations sampled is provided on Attachment 1 of this report. CSSA sampled thirty-three private and public off‑post wells, thirty-seven on‑post monitoring wells, and three on-post drinking water wells during Quarter 25. Results will be formally reported in the draft June 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 25.  A sampling event was performed July 8, 2005, on each of the SVE wells located inside Building 90 to obtain data on the contribution to removal rates of contaminants from each individual extraction well.  The data will be used to adjust the extraction wells actively incorporated into the system to optimize contaminant mass removal.

RCRA Facility Investigations/Closures of SWMUs and AOCs

A summary of RFI results for samples collected during Quarter 25 is provided in Attachment 3. RFI reports for these sites are currently being prepared.

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. A total of four wells are planned to monitor the groundwater underlying SWMU B-3 prior to construction of the bioreactor cell and following initiation of the bioreactor treatability test.

  1. Summary of Changes

No changes to the RFI were made during this Quarter.

  1. Summary of Contacts

Results from the March 2005 quarterly groundwater monitoring event were mailed to each off‑post well owners on May 27, 2005.  In addition, CSSA received several letters from the TCEQ during Quarter 25.  The following correspondence was submitted to and/or received from TCEQ or EPA:

May 2, 2005

CSSA submittal of the Quarter 24 Progress Report to EPA and TCEQ;

May 11, 2005

Submittal of the December 2004 On- and Off-post Quarterly Groundwater Monitoring Reports to TCEQ;

May 18, 2005

Submittal of the Long Term Monitoring Optimization (LTMO) Evaluation to TCEQ and EPA for review and approval;

May 27, 2005

Letters to various off-post well owners transmitting results from March 2005 sampling;

June 1, 2005

TCEQ no further response required letter concerning Compliance Investigation conducted May 5, 2005;

June 6, 2005

TCEQ authorization for CSSA permit by rule registration number 75807;

June 10, 2005

TCEQ request for additional information regarding SWMU B‑29;

June 13, 2005

TCEQ authorization for construction of Building 601 Crate Assembly under Permit 75991;

June 17, 2005

TCEQ Approval of September 2004 Off-Post Monitoring Report;

June 17, 2005 

TCEQ Approval of September 2004 On-Post Quarterly Groundwater Monitoring Report;

June 21, 2005

Submittal of March 2005 Off-post Groundwater Monitoring Report.

June 23, 2005

TCEQ transmittal of draft proposed permit for TPDES Permit;

July 20, 2005

TCEQ approval of Delisting and No Further Action for AOC 41, 44, 49 and 60;

July 22, 2005

Approvals of Closure Reports for SWMU B-12, B-23, B-25, AOC 46 and AOC 53; and

July 22, 2005

CSSA submittal of Uniform Hazardous Waste Manifest Correction.

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

On July 5 6, 2005, Jorge Salazar and Cassie Kalinec of TCEQ conducted an inspection at CSSA, with Greg Lyssy of EPA observing.  CSSA personnel participating in the inspection included Jason Shirley, Brian Murphy, Glare Sanchez and Dan Adams.  Parsons personnel Kyle Caskey and Ken Rice also attended the inspection.  Two issues were identified during the exit briefing:  1) improper storage of utility poles and railroad ties at AOC-54, and 2) incorrect labeling of drum as “waste oil” instead of “used oil.”   The incorrect label was removed and replaced with a correct label during the inspection, resolving the second issue.  The TCEQ inspection included AOCs 37, 38, 48, 50, 54, 55, 56, 66, and 67, SWMUs B-3, B-4, B-11, B-20, B-23A, B-24, B-25, B-26, B-29, B-30, B‑33, Demo Dud, Bldg 40, F-14, and O-1 and Buildings 43, 90, 86, 93, the Motor Pool, and the East Pasture Range.

Two meetings were held at the TCEQ Office during this quarter.   One was between TCEQ Project Manager Sonny Rayos and Parson’s representative Ken Rice on May 3, 2005, and the second between Mr. Rayos and the new CSSA Environmental Program Manager, Ms. Glare Sanchez on July 21, 2005.  Abigail Power and Jorge Salazar of the TCEQ San Antonio office were included by conference call during the July 21, 2005 meeting.  The purpose of both meetings was to discuss TCEQ’s response letter dated March 31, 2005 regarding CSSA RFI and Interim Measures Waste Management Plan.  CSSA is currently drafting their response based on the discussions held at the meeting and expects to submit it to TCEQ by the first week of September 2005.

  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 25.  Upon completion of the Technology Evaluation Report, 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 June 2005 On- and Off-Post Groundwater Monitoring Reports will be submitted to CSSA and AFCEE for review in Quarter 25.  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 September 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 26.  The Westbay® wells will be profiled and sampled once per month for the foreseeable future, including Quarter 26.  Monitoring frequencies may be modified in the future 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 26.  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 26.  Closure/delisting/NFA has been approved for 33 sites, including B-1, B-5, B-6, B-7, B-9, B‑10, B-11, B-19, B-22, B-23A, B-26, B-30, B-31, B-32, B-33, Bldg 40, DD, F-14, O-1, AOC-35, AOC-36, AOC-37, AOC-38, AOC-39, AOC-40, AOC-43, AOC-47, AOC-48, AOC‑50, AOC-54, AOC-56, AOC-61, and AOC-66.  Closure/delisting/NFA is pending TCEQ approval for 14 sites, including B‑12, B-14, B-23, B-25, B-29, Bldg 43, Coal Bins, AOC‑41, AOC-44, AOC-46, AOC-49, AOC-53, AOC-55, and AOC-60.

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

Drilling of the four multi-port monitoring wells around SWMU B-3 will be continued next quarter.  Geophysical borehole testing, packer interval sampling, and injection packer testing, among other borehole data collection techniques are planned to ensure proper placement of the monitoring ports in each borehole, and to provide additional data for use on planned EAB treatability test of the aquifer.  A well will be installed as part of the drilling effort near one of the multi-port wells for injection of a substrate mixture to assess the potential for EAB to reduce contaminant levels in the aquifer.

Following completion of the multi-port and monitoring wells under TO0006, groundwater sampling will be conducted to establish baseline aquifer conditions prior to removal actions, and injection of substrate into the monitoring well designated for the injection test.

  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.  he 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.  Tabulated results and figures for each site sampled this Quarter are provided in Attachment 3.

  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 26.

  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.

  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 was not received from the laboratory in Quarter 25.  The O&M plan was submitted to CSSA for review on June 30, 2005.

SWMU B‑3 Preliminary Geologic and SVE Pilot Study Investigation

The blower at SWMU B-3 is currently out of service due to a burned out motor.  No data was collected from the SWMU B‑3 SVE system during the subject reporting period.  Information to replace the motor was collected during Quarter 25.

  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 for August 2005, pending approval of the O&M Plan, completion of a 30-day idle period following a July test event of the subslab system and replacement of the SWMU B-3 blower. 

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 21 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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