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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 24, the RFI is approximately 54 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 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
Task Order (TO) 0006 was awarded during Quarter 22. TO0006 provides for construction of a wastewater outfall reuse system, aboveground storage tank upgrade, and continued remedial actions and studies at SWMU B‑3 and AOC-65. Preparation of WPs for TO0006, including WP addenda, SAP addenda, HSP addenda, and a construction quality plan were drafted during Quarter 24. Two meetings were held to discuss the draft data quality objectives (DQOs) for the activities planned under TO0006, including the push‑pull test at SWMU B-3, soil vapor extraction (SVE) system expansion at AOC-65 and SWMU B-3, and updates to the O&M plan were also prepared during Quarter 24. Minutes for the first DQO meeting, held January 21, 2005, were finalized in Period 24. Attendees at this meeting included: CSSA Environmental personnel, Sonny Rayos and Abigail Power of TCEQ, Greg Lyssy of USEPA, and various Parsons Austin personnel. The meeting discussions focused on the technical approach for the integrated remedy planned at SWMU B-3 with regard to enhancing biological degradation in the groundwater plume and accelerating cleanup of contaminants in fractures underlying the SWMU B-3 trench through construction of a bioreactor in the trench excavation. The second DQO meeting was held with CSSA engineers and environmental staff to discuss design and construction specifications for the AST upgrade and the Outfall 01 Reuse system. The AST upgrade work plan was submitted to CSSA for review on April 1, 2005, and was finalized in Quarter 24.
Parsons held a Stakeholder Project Safety Plan (PSP) Alignment meeting on April 15, 2005, to present the PSP prepared under TO0006 which updates and revises the current master safety plan for the environmental program being administered at CSSA to each stakeholder. The stakeholders who attended the meeting included members of the CSSA environmental and safety office and the AFCEE Contracting Officer’s representative for all active AFCEE task orders at CSSA. The revised PSP provides for greater safety awareness and consistency among Parsons and Parsons’ subcontractors in the implementation of task order activities at CSSA.
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 24, 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:
Characterize the environmental setting of the facility;
Define the source(s) of contamination;
Define the nature and extent of contamination; and
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, AOC‑55 regulatory correspondence, and various miscellaneous tasks.
Groundwater Monitoring
There are currently 41 drinking water, livestock, and monitoring wells at CSSA that are monitored as set out in the DQOs for the Groundwater Monitoring Program. In addition, there are four Westbay® multi‑port wells that are sampled on a monthly basis. Sampling of all on‑post and selected off‑post wells is conducted quarterly.
Off‑post wells were sampled from March 21 to 24, 2005. Thirty-two 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 on these samples on April 14, 2005. Data validation and verification for these samples were initiated this Quarter and Parsons’ chemists submitted these data packages to AFCEE and Portage Environmental on April 25, 2005.
Quarterly groundwater monitoring of on‑post monitoring and drinking water wells was performed on March 7 to 17, 2005. Forty on-post monitoring wells and CSSA 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. Parsons received the preliminary data packages from March 22 to 31, 2005. Data validation for VOCs and metals was performed this Quarter and Parsons’ chemists submitted these data packages to AFCEE and Portage Environmental on April 25, 2005.
The draft Off-Post Quarterly Groundwater Monitoring Report for December 2004 was submitted to CSSA and AFCEE for review on February 11, 2005. CSSA comments were received on April 1, 2005, and responses to comments were provided to CSSA on April 12, 2005. The draft On-Post Quarterly Groundwater Monitoring Report for December 2004 was submitted to CSSA and AFCEE for review on February 16, 2005. CSSA comments were received on April 1, 2005, and responses to comments were provided to CSSA on April 12, 2005. CSSA concurrence has not been received. The reports will be issued as Final when CSSA concurrence to responses to comments are received and will be added to Volume 5 of the Environmental Encyclopedia at that time.
Westbay®‑equipped Well Sampling Events
Formation pressures in each sample zone were profiled and zones with groundwater were sampled this quarter. Sampling was conducted for the Westbay® multi‑level wells (CS‑WB01, CS-WB02, CS‑WB03, and CS‑WB04) from February 22 to 23 and April 20 to 21, 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. Wells were profiled on February 4 and 11, March 1, April 13, 25, and 28, 2005. Results will be presented in the March 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 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 micron 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 Quarter 24. Discharge rate, drawdown, and contaminant concentrations have been monitored throughout the duration of the pilot study. The system is currently operating at approximately 12.5 gallons per minute (gpm) (18,000 gallons per day [gpd]), which is 60 percent of the permitted discharge limit.
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 February to April 2005, approximately 1,560,000 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 24 under CSSA projects TO0008 and TO0019.
Parsons received twenty-nine data packages during Quarter 24, six related to quarterly groundwater monitoring activities, 12 related to outfall sampling, three Westbay data packages, three 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 #119, 120, 121, 122, 123 & 128 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, closure of 28 sites has been approved by TCEQ. Additional closure reports are currently being prepared for submittal to TCEQ. A no-cost modification to the project was approved in December 2004, which added nine sites to the original SOW.
During Quarter 24, soil/waste investigations and/or excavations were conducted at SWMUs B‑2, B‑28, Bldg 43, AOC‑46, and AOC‑53. A brief summary of site progress follows:
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B‑2: Sampling was conducted during to define the horizontal extent of lead contamination this Quarter. |
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B‑28: Waste characterization samples were collected and submitted for analysis during Quarter 23. Those samples showed B‑28 soils to be Class 2 non-hazardous. The soils were disposed at Covel Gardens Landfill during February. |
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Bldg 43: Disposal of the treated hazardous waste occurred during this Quarter. Also, additional scraping was performed at the site to reduce copper levels. This material was disposed as Class 2 non-hazardous waste. |
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AOC‑46: Excavation was performed to reduce lead levels in soil at AOC‑46. Soils were disposed as Class 2 non-hazardous waste at Covel Gardens Landfill. |
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AOC‑53: Overexcavation and resampling was conducted at sampling locations that exceeded RRS1. All waste was disposed as Class 2 non-hazardous waste at Covel Gardens Landfill. |
Hydrogeologic Conceptual Site Model Preparation and Well Installation Report
A draft version of the CSSA Hydrogeologic Conceptual Site Model (CSM) was submitted to AFCEE and CSSA for internal review on January 27, 2004. CSSA provided comments during Quarter 21 and responses to comments are currently being prepared. The Final CSM report will be submitted during Quarter 25.
Building 90/AOC‑65 Investigation
Groundwater sampling was performed following significant rainfall events under TO 0058. This work was done to meet recharge study DQO requirements. Due to dry conditions no samples were collected in Quarter 24. This sampling is no longer covered under TO0058, which was closed out April 2005.
AOC‑55 Excavation
Removal actions at AOC‑55 were completed during Quarter 20. Comments to the closure report were received July 8, 2004 from the TCEQ. A response to the TCEQ’s first comments was submitted during Quarter 22. TCEQ provided additional comments on November 18, 2004. CSSA responded to TCEQ’s letter on December 28, 2004. Additional TCEQ comments were received in a letter from TCEQ to CSSA dated March 24, 2005.
Miscellaneous
Letters summarizing the results of the December 2004 off‑post groundwater monitoring event were mailed to the owners of the off‑post wells on February 28, 2005. Fact Sheet 21 covering the sampling conducted in December 2004 was mailed to all recipients on the CSSA mailing list during Quarter 24. Draft letters to well owners and a draft Fact Sheet 22 summarizing the March 2005 groundwater monitoring results will be submitted to CSSA and AFCEE for review during Quarter 25.
The CSSA website was updated with documents added to the Environmental Encyclopedia through the end of April 2005. Additional updates are planned to the website design and website design templates were prepared during Quarter 24. Draft website design templates were delivered to CSSA for review on April 1, 2005. CSSA provided review and comment on April 4, 2005, and efforts to revise the website design were initiated. 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 April 2005. Updates made in Quarter 24 included the following:
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Quarterly Progress Report for Quarter 24; |
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Final AOC 50 Closure Report; |
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Final SWMU DD Closure Report; |
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September 2004 Off-post Groundwater Monitoring Report; |
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September 2004 On-post Groundwater Monitoring Report; |
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Final SWMU B-29 Closure Report; |
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AOC-65 Soil Vapor Extraction Operations & Maintenance Assessment Report; |
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AOC-65 Soil Vapor Extraction Interim Treatability Test Report; and |
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Various correspondence with regulatory agencies. |
The Facility Investigation task makes up approximately 45 percent of the RFI phase. As of the end of Quarter 21, this task is approximately 28 percent complete.
Groundwater Monitoring
Quarterly groundwater monitoring for both on‑ and off‑post wells was performed at CSSA from March 7 to March 22, 2005. A map of the well locations sampled is provided on Attachment 1 of this report. CSSA sampled thirty-two private public off‑post wells, thirty-seven on‑post monitoring wells, and three on-post drinking water wells during Quarter 24. Results of the March 2005 groundwater monitoring event will be formally reported in the draft March 2005 Quarterly Groundwater Monitoring Reports to be submitted to CSSA and AFCEE for review and comments during Quarter 25.
Building 90/AOC‑65 Investigation
The AOC-65 SVE systems were operated periodically throughout Quarter 24. No additional investigation activities were performed at AOC-65 during the subject-reporting period.
RCRA Facility Investigations/Closures of SWMUs and AOCs
Findings of current investigations and closures at SWMUs and AOCs were described previously in this section. In general, excavation and confirmation sampling continues at each site until Risk Reduction Standard 1 (RRS1) criteria are met. Closure reports are drafted as site investigations are concluded.
No changes to the RFI were made during this Quarter.
Results from the December 2004 quarterly groundwater monitoring event were mailed to each off‑post well owner February 28, 2005. In addition, CSSA received several letters from the TCEQ during Quarter 24. The following correspondence was submitted to and/or received from TCEQ:
March 24, 2005
March 24, 2005
March 24, 2005
TCEQ comments to December 28, 2004, letter regarding additional information for closure of AOC-55.
Copies of all correspondence are included in Volume 1‑1 of the Environmental Encyclopedia.
A DQO meeting was held during Quarter 24 under TO0006 to discuss design and construction specifications and requirements for the AST upgrade and Outfall 01 Reuse System.
The teleconference for planning of the March 2005 groundwater monitoring event was held on February 25, 2005. Parsons personnel Tammy Chang, Kimberly Riley, Eric Tennyson and Samantha Elliott participated along with CSSA personnel Brian Murphy, Chris Beal and Jeff Aston.
On March 8, 2005, TIM#2 under TO0008 was held to present the draft LTMO study recommendations to CSSA, AFCEE and EPA. Carolyn Nobel, Scott Pearson, Kimberly Riley, Samantha Elliott and Eric Tennyson attended from Parsons, as well as Teri DuPriest from AFCEE, Brian Murphy of CSSA and Greg Lyssy from EPA. Discussions were held concerning regulatory approval and application of the LTMO sampling recommendations to the current groundwater program. Revisions to the DQOs were discussed. A public meeting/open house was discussed to inform the area residents of the findings from the LTMO study and the reduced sampling frequency recommended for off-post wells.
On March 25, 2005, a teleconference was held for planning purposes prior to the laboratory audit of APPL. Joe Fernando of Portage Environmental, Tammy Chang and Katherine LaPierre of Parsons Austin participated in the teleconference. The APPL laboratory audit was subsequently conducted on March 28-30, in Fresno, California. Parsons personnel Tammy Chang, Katherine LaPierre and CSSA personnel Brian Murphy and Jeff Aston participated in the laboratory audit.
On March 30-31, 2005, CSSA personnel Brian Murphy and Jeff Aston along with Kimberly Riley of Parsons Austin attended the LTMO for Groundwater Seminar conducted by the USEPA California, USACE and Department of the Army. A simplified version of the CSSA LTMO case study (currently draft) was presented as a training case study for the seminar attendees.
On April 21, 2005, a meeting was held at TCEQ offices concerning the AOC-55 closure report and comments from TCEQ. Sonny Rayos of TCEQ and Ken Rice, Parsons Austin, participated in the meeting. The discussion covered the TCEQ comments letter dated March 24, 2005, concerning AOC-55 closure.
No significant problems were encountered during this Quarter.
No actions to correct problems necessary.
Fact Sheets
Fact Sheet 22, drafted in Quarter 24, will be distributed to area residents reporting on the March 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 CSSA to educate area residents on the justification for reduced well sampling frequencies in the future.
Groundwater Monitoring
Final December 2004 On- and Off-Post Groundwater Monitoring Reports will be submitted in Quarter 25. A summary annual report for 2004 will be submitted in Quarter 25. Draft March 2005 On- and Off-Post Groundwater Monitoring Reports will be submitted to CSSA and AFCEE for review in Quarter 25.
The draft LTMO study will be made final and presented to the regulators for review in Quarter 25. 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 into the next quarter. The LTMO plan evaluated the historical groundwater trends and determined a reduction in sampling frequency was appropriate for selected wells and Westbay® zones.
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 25. The Westbay® wells will be profiled and sampled once per month for the foreseeable future, including Quarter 25. 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 work will be continued for SWMUs and AOCs during Quarter 25. During Quarter 24, a no‑cost modification to the SOW for TO0019 resulted in 11 additional sites being added to the TO. All RRS1 closure, delisting, and no further action reports were submitted to TCEQ by May 1, 2005. Closure/delisting/NFA has been approved for 31 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, F-14, O-1, AOC-35, AOC-36, AOC-37, AOC-38, AOC-39, AOC-40, AOC-43, AOC-47, AOC-48, AOC-54, AOC-56, AOC-61, and AOC-66. Closure/delisting/NFA is pending TCEQ approval for 15 sites, including B‑12, B-14, B-23, B-25, B-29, Bldg 43, DD, Coal Bins, AOC-44, AOC-49, AOC-50, AOC-53, AOC-55, and AOC-60. Discussions detailing how to address remaining sites will be conducted next Quarter.
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:
Contaminant Identification;
Exposure Assessment;
Toxicity Assessment; and
Risk Characterization.
For ecological risks, the effort will include the following components:
Problem Formulation;
Exposure Assessment;
Ecological Effects Assessment; and
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 task 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 will be included as part of the RFI Report. For sites closing to a risk‑based standard, the analysis will be submitted along with the Risk Assessment Report. Background levels will be used to determine the possibility of closure under RRS1. The Investigation Analysis will also include groundwater protection standards and other relevant protection standards. The relevant protection standards will be used at sites where an RRS1 closure is not applicable. Due to the promulgation (September 23, 1999) of the Texas Risk Reduction Program (TRRP) (30 Texas Administrative Code [TAC] §350) by the TCEQ, two options are being considered for the protection standards. One option is to base the protection standards on the RRS2 Media‑Specific Concentrations. The other option is to use the Protective Concentration Limits developed under TRRP. Site‑by‑site decisions will be made as additional information becomes available. TO0019 seeks closure of SWMUs and AOCs under the RRS.
Activities this Quarter
No activities related to Investigation Analysis this Quarter.
The Investigation Analysis task makes up approximately 10 percent of the RFI phase, and is approximately 69 percent complete.
As described in Task III, final RFI reports recommending closure 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. Based on the closure reports currently in preparation and those submitted through Quarter 24, 29 sites are recommended for closure while other sites may require future investigation and/or cleanup to TRRP standards. Through December 2004, a total of 23 SWMUs or AOCs have been approved by TCEQ for closure.
No changes associated with the Investigative Analysis were made during this Quarter.
No contacts related to the Investigative Analysis were made during this Quarter.
No problems related to the Investigative Analysis occurred during this Quarter.
No actions to correct problems were necessary during this Quarter.
Continued work on comparison of investigation results to closure criteria will be performed in Quarter 24.
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
Parsons discontinued O&M of the AOC‑65 SVE system on June 25, 2004, per the O&M plan. One year of continued O&M at both AOC‑65 and SWMU B‑3 is included in the new TO006. The final O&M Assessment Report and its associated recommendations for future O&M activities were approved this quarter, and revisions of the existing O&M plan were initiated during Quarter 24 with plans to re-initiate O&M in May 2005.
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 38 percent complete.
AOC‑65 SVE System
No data was collected from the AOC‑65 SVE system during the subject‑reporting period. Operation of the SVE systems at AOC-65 are continuing intermittently, but no data collection is being performed until O&M recommendations are approved and the revision of the O&M plan is completed.
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. The blower will be dismantled and will either be repaired or replaced in Quarter 25. No data was collected from the SWMU B‑3 SVE system during the subject reporting period.
No changes to report this quarter.
No contacts were made regarding the treatability studies during the subject reporting quarter.
No problems related to the treatability studies occurred during this Quarter.
No actions to correct problems were necessary during this 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. Tentative start of the O&M period for both SVE systems is May 2005 following approval of the updated O&M Manual.
Field scale treatability studies of PIMS for the previously sifted soil piles will continue in Quarter 24 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.
No analytical data were submitted during this Quarter. Closure work will be continued for several SWMUs and AOCs during Quarter 24.
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. Seven progress reports (December 2003 – July 2005) are funded under TO0005.
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 20 percent complete.
No findings associated with the progress reports were made during this Quarter.
No changes associated with the progress reports occurred during this Quarter.
No contacts relating to progress reports were made during this Quarter.
No problems relating to progress reports occurred during this Quarter.
No actions to correct problems were necessary during this Quarter.
The Progress Report for Quarter 24 will be submitted.
No daily reports, inspection reports, or data related to the Progress Reports were generated during this Quarter.