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7th 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, and identify actual or potential receptors and any additional IM that may be warranted.  The RFI is estimated to represent approximately 30% of the required actions at CSSA.  The RFI includes a Preliminary Report (5% of RFI), RFI Work Plan (10%), Facility Investigation (45%), Investigation Analysis (10%), Treatability Studies (10%), and Progress Reports (5%).  At the end of Quarter 7, the RFI is approximately 37% complete.

Task I:  Preliminary Report:  Description of Current Conditions

Task Description

This task includes preparation of the Description of Current Conditions (DCC) Report.  The DCC Report includes 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 is included in the DCC Report.  CSSA’s Environmental Encyclopedia was used to meet the DCC Report submittal requirements.

Completion of this task has been fully funded (under delivery order RL74).  The final DCC Report was submitted to EPA and TNRCC on August 1, 1999.  No regulatory comments have been received on the report.  In addition, copies of the Groundwater Investigation and Source Characterization Report (Parsons ES, June 1996), the B-20 Remedial Investigation Report (Parsons ES, June 1995), and Addendum to the B‑20 Remedial Investigation Report (Parsons ES, June 1996) will be provided to the EPA and TNRCC as soon as they are available in an electronic format.

Activities this Quarter

The majority of the three reports mentioned in the above paragraph were provided to CSSA and AFCEE in an electronic hyperlinked format.

  1. Percent Complete

This task makes up approximately 5% of the RFI phase.  This task is 100% complete.  Therefore, no changes occurred for progress report items:  B (Summary of Findings), C (Summary of Changes), D (Summary of Contacts), E (Summary of Problems), F (Actions Taken to Correct Problems), G (Projected Work for Next Quarter), and H (Copies of Daily Reports, Inspection Reports, Data, etc.).

Task II:  RFI Work Plan

Task Description

The Order requires that the RFI Work Plan include a Project Management Plan, Data Collection Quality Assurance Plan, Health and Safety Plan, and a Community Relations Plan (CRP).  As previously agreed by EPA, CSSA’s Environmental Encyclopedia, which includes all of the information (with the exception of the CRP) required by the Order, in a unique format, will be used to fulfill this requirement.

Completion of this task has been funded for the RFI tasks that have been planned.

Activities this Quarter

Modifications to the work plan and a health and safety addendum for the work activities planned under AETC DO 5084 were submitted to AFCEE and CSSA for review on December 14, 2000.  A draft addendum for the site-specific soil gas survey task at AOC-57 and AOC-65 was also prepared for AFCEE and CSSA review.  CSSA and AFCEE completed their review of the plan modification and addenda and provided comments to Parsons ES on December 20, 2000.  Parsons ES resubmitted the revised addenda and the modified work plan on December 22, 2000.  A mobile laboratory (DHL Analytical) is supporting the soil gas survey effort, and Parsons ES received conditional approval of their standard operating procedure for modified method 8021B (8021mobile-sv-01) from AFCEE on December 22, 2000.  Site specific field sampling plan addenda for the RFI soil and perched groundwater sampling planned at AOC 67 and AOC 65, and the off-site and on-site groundwater sampling (under AETC DO 5084) will be prepared for those respective tasks prior to initiating field activities.

Funding for DO 5068 SOW modification was approved on August 2, 2000.  The modification allowed for a revised sampling strategy at AOCs 35, 42, 43, and 50.  Modified work plans that reflect the SOW changes were submitted for review on September 22, 2000.  Draft final work plan revisions were submitted on December 8, 2000.  The final versions of the amended work plans will be submitted during January 2001.

The majority of the RFI Work Plan was submitted to CSSA and AFCEE in an electronic hyperlinked format on January 10, 2001.  Additional RFI Work Plan material will be added as it is finalized.

  1. Percent Complete

This task makes up approximately 10% of the RFI phase.  As of the end of Quarter 7, this task is approximately 99% complete.  The remaining 1% of this task is associated with the CSSA Encyclopedia hypertext document, and will be incomplete for an indefinite period of time.

  1. Summary of Findings

No new findings associated with RFI Work Plan preparation during this reporting period.

  1. Summary of Changes

Work plan amendments to the DO 5068 AOC investigations and RL83 Well Installations were submitted and approved during Quarter 7.

Modifications to the Work Plan, Field Sampling Plan, and Site-Specific Plans were submitted to AFCEE and CSSA for review on September 22, 2000.  The updated plans addressed modifications to the DO 5068 work scope for investigative actions at AOCs 35, 42, 43, and 50.  The investigative approach for these sites were modified based upon Phase I geophysical results and roundtable discussions/decisions at the February 3, 2000 TIM.  Comments with respect to the amended plans were received on October 16, 2000.  Responses to these comments were prepared and submitted on November 3, 2000.  Additional clarifications were requested on November 21, 2000.  The draft final work plans were submitted on December 8, 2000.  Work at these sites is anticipated to resume after the submittal of the final work plan revisions during January 2001.

An addendum to the RL83 Cluster Well Work Plan and Sampling and Analysis Plan was submitted to CSSA, AFCEE, and the EPA on November 14, 2000.  The addenda provided for the use of drilling foam (QuikFoamä) to assist drill-cutting removal from large-diameter boreholes during the drilling program.  This addendum was approved by AFCEE and CSSA.  A second addendum to the RL83 work plans was submitted on January 11, 2001 to provide for alternative grouting methods of surface casing and re-sizing the mesh size of the monitoring well filter pack.  CSSA and AFCEE provided comments to Parsons ES for this second addendum on January 19, 2001, and their comments are currently being addressed.

  1. Summary of Contacts

No contacts related to the RFI Work Plan were made during this reporting period.

  1. Summary of Problems

No problems related to the RFI Work Plan during this reporting period.

  1. Actions Taken to Correct Problems

No actions to correct problems necessary during this reporting period.

  1. Projected Work for the Next Quarter

Based on the results from the soil gas survey, site specific sampling and analysis plan addenda will be prepared for the soil borings planned at AOC 65 and AOC 67.  The planned duration of the soil gas survey is eight (8) weeks beginning on January 2, 2001, so preparation of the plan addenda for the work planned at AOC 65 and AOC 67 may be delayed until the second quarter (April-June 2001).

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

No daily reports, inspection reports, or data related to the RFI generated during this reporting period.

Task III:  Facility Investigation

Task Description

An investigation of the facility will be conducted to A) characterize the environmental setting of the facility; B) define the source(s) of contamination; C) define the nature and extent of contamination; and D) identify actual or potential receptors.  In some cases, multiple phases of investigation may be necessary.  The investigation results will be used to develop and evaluate alternatives during the Corrective Measures Study.  All investigation activities will be conducted in accordance with the RFI Work Plan.

Completion of this task is partially funded for the RFI tasks that are planned.  Investigation of all SWMUs, except SWMU B-2, is funded, and investigation of all AOC, except AOCs 44-46, 49, 51-55, 57, 59, 60, 62-64, and 67-70, is funded.  Preparation of work plan addenda for the AOC65 and AOC67 RFIs will begin upon completion of soil gas surveys planned under the new AETC DO (No. 5084).  The investigation work at AOC 65 and AOC 67 includes drilling and sampling of 16 soil borings, 3 of which are inside Building 90 and 13 of which are located outside of the building. 

Currently, the installation of four well clusters and three individual wells (12 wells total) has been funded.

Activities this Quarter

Four draft RFI Closure reports were prepared by Parsons ES and submitted for review by AFCEE and CSSA on September 29, 2000.  The reports documented efforts to address the presence of near-surface PCE in the soil gas within the South Pasture.  Comments regarding the draft submittals for AOCs 36, 38, 39, and 40 Closure Reports were received on October 30, 2000 from CSSA reviewers.  Responses to the CSSA comments were prepared during November 2000.  Comments regarding the closure reports were received from AFCEE reviewers on December 18, 2000.  Responses to those comments will be prepared in January 2001.

A geophysical survey, consisting of two parts, was conducted at AOC 50 between December 19 and 22, 2000.  The first part included a primary survey area using electromagnetic (EM) and ground-penetrating radar (GPR) technologies at a potentially disturbed area south of the originally defined site boundary.  The second part included a secondary survey area using EM methods only, and was an attempt to detect nickel penetrate within the future excavation area.

The installation of monitoring wells began on November 15, 2000.  Field activities initiated with the start of the MW9 well cluster, located in the North Pasture serving as an upgradient well position.  Cores were retrieved, sampled, and archived from the Glen Rose, Bexar Shale, and Cow Creek members of the Middle Trinity Aquifer.  Borehole geophysics and injection packer tests were performed in the borehole, which penetrated the underlying Hammett Shale at 457 feet below grade.  A second rig was mobilized to the site on January 19, 2001 to assist in the well installations.

Validation of data packages continued during Quarter 7.  A meeting was held December 15, 2000, with CSSA, AFCEE, Informatics, and Parsons ES to discuss data validation.  Content of the Informal Technical Information Reports (ITIRs) was agreed to include data packages, approved laboratory variances from the AFCEE QAPP, verification/validation checklists, and a data validation report.  ITIRs previously submitted to AFCEE were returned to Parsons to incorporate the agreed items.  Descriptions of data verification, data validation, and reviewed data are provided in the “Other” section of this report.

  1. Percent Complete

This task makes up approximately 45% of the RFI phase.  As of the end of Quarter 7, this task is approximately 18% complete.

  1. Summary of Findings

A total of 120 data packages are in the data validation/AFCEE review process.  As of October 23, 2000, 18 packages were reviewed and accepted by AFCEE.  Results for these packages were submitted during the previous quarter.  During this quarter, AFCEE returned the packages to Parsons ES for grouping by laboratory, contract, sampling effort, and matrix.

Preliminary field results of the AOC 50 geophysical survey suggest that no subsurface anomalies are present at AOC 50.  Initial results also indicate that the EM-31 instrument was able to detect the presence of nickel penetrate slag with some success.  The identification of the slag material will be beneficial for the impending IM removal of the waste during Quarter 8.  In its present form, the preliminary data is unsuitable for draft presentation, and therefore is not included with this quarterly report.

Data collection from the well cluster installations continued through the end of Quarter 7.  Qualitative data indicates that perched water may be present in the North Pasture during wetter periods of the year.  Thus far, the thickness and depth of each formational member was observed as previously estimated.  Contacts between the Glen Rose, Bexar Shale, and Cow Creek members are sharp and definitive.  The Bexar Shale is considerable less permeable than other bounding members.  As of yet, determinations regarding hydraulic connectivity between the formational members have not been established.

  1. Summary of Changes

One new SWMU (SWMU 71) and two new AOCs (AOC 72 and AOC 73) were identified at CSSA.  SWMU 71, located on approximately 1 acre in the South Pasture, is an area where spent ammunition was buried.  AOC 72, approximately 0.1 acre, is located near the northwestern corner of CSSA, near well H, and is an area of surface metal debris and a possible disposal trench.  AOC 73 is located near the southwestern corner of the base, due west of Building 94 and is an area of fill material where transite panels have been identified.

The DO 5068 SOW was revised and funded on August 2, 2000.  The SOW amendment provides for a revised investigative approach at AOCs 35, 42, 43, and 50.

DO 5084 was issued under Parsons ES’ contract with AETC to continue RFIs at AOC65 and AOC67, and complete a soil gas survey at AOC65 and AOC57.

  1. Summary of Contacts

The USEPA, AFCEE and CSSA were contacted regarding use of a foaming agent (QuikFoamä) to help remove drill cuttings from boreholes during monitoring well installation.  Based on discussions and review of the foaming agent material safety data sheet (MSDS), the decision was made to allow use of the foam.  As an added precaution, a gas chromatograph “finger print analyses” was run on a sample of the foaming agent to confirm the constituents.  This analyses found the foam sample contained ethanol, 2-propanol, 1,4-dioxane, long chain olefinic compounds starting at 1-octene, long chain alcohols starting at 1-hexanol, and other miscellaneous long chain hydrocarbons.  Given that these compounds are not contaminants of concern at CSSA and because of the small volume of foam added to the wells (approximately 1 quart), it was confirmed that the use of foam would not cause a cross contamination problem in the well bore.

  1. Summary of Problems

Agreements were made regarding the use of QuikFoamä during drilling activities.  By December 3, 2000, it became apparent that drill-cuttings removal from large diameter boreholes was extremely difficult at depth.  The major problem was that the cuttings could not be adequately flushed from the borehole for setting casing.  CSSA advised the EPA that they would use QuikFoamä to "clean out" troublesome borings.  The use of QuikFoamä was initiated on December 4, 2000.  A sample of QuikFoamä was submitted to an independently contracted laboratory for analysis on December 20, 2000.

On December 5, 2000, during the installation of well MW9-CC, the 12" steel casing collapsed during the grouting process.  Beginning December 11, 2000, Parsons ES and GeoProjects relocated to a nearby location and began redrilling MW9-CC.  The 12-inch casing was successfully installed nine days later on December 19, 2000.  The remainder of the well was completed in January 2001.

  1. Actions Taken to Correct Problems

No actions to correct problems necessary during this reporting period.

  1. Projected Work for the Next Quarter

The installation and development of 15 monitoring wells at CSSA will continue through Quarter 8.

Pending the final work plan approval for AOCs 35, 42, 43, and 50, work will resume at these sites, including surface and subsurface sampling, and interim measures waste removal at AOC 50.

Under AETC DO 5084, the soil gas survey will be performed during the next quarter.  Preparation of the Technical Report for the soil gas survey will be initiated following the completion of the field activities.  Site specific sampling and analysis plan addenda will be prepared for the AOC 65 and AOC 67 soil borings based on the results from the soil gas survey.  The soil gas survey will include up to 600 points with an expected duration of approximately 8 weeks.  The tentative start date was postponed from December 4, 2000 to January 3, 2001 to enable review of the soil gas survey sampling and analysis plan addendum, the health and safety plan addendum, and the AETC DO 5084 modification to the work plan.

The installation of 15 new groundwater monitoring wells will continue into Quarter 8.  Well installation activities began November 15, 2000.

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

No daily reports, inspection reports, or data related to the RFI were generated during this reporting period.

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 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 basewide human health and ecological Conceptual Site Model (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.

Activities this Quarter

No actions this quarter.

  1. Percent Complete

This task makes up approximately 15% of the RFI phase.  The amount of effort needed to accomplish this task is not yet known because analytical data are not yet available or have not yet been fully evaluated.  The percent complete depends on the number of sites requiring risk assessment.  Since there have been no actions associated with this task this quarter, no changes occurred for progress report items B (Summary of Findings), C (Summary of Changes), D (Summary of Contacts), E (Summary of Problems), F (Actions Taken to Correct Problems), G (Projected Work for the Next Quarter), and H (Copies of Daily Reports, Inspection Reports, Data, etc).

Task V: Investigation Analysis

Task Description

This task includes preparation of an Investigation Analysis to support the selection of protection standards for CSSA.  It will be submitted along with the Risk Assessment Report, and it will describe the extent of the contamination in relation to background levels indicative for the area around CSSA.  Background levels will be used to determine the possibility of closure under Risk Reduction Standard 1.  The Investigation Analysis will also include groundwater protection standards and other relevant protection standards.  The relevant protection standards will be used at sites where a Standard 1 closure is not applicable.  Due to the recent promulgation (September 23, 1999) of the Texas Risk Reduction Program (TRRP, 30 TAC §350) by the TNRCC, two options are being considered for the protection standards.  One option is to base the protection standards on the Risk Reduction Rule Standard 2 Media-Specific Concentrations.  The other option is to use the Protective Concentration Limits developed under TRRP.  The decision will be made as additional information becomes available.

Activities this Quarter

During this quarter, data table preparation was continued to compare investigation results to closure criteria.  Preparation of investigation/closure reports for each SWMU investigated this spring was initiated.

  1. Percent Complete

This task makes up approximately 10% of the RFI phase, and is approximately 23% complete.

  1. Summary of Findings

No new findings associated with Investigative Analysis preparation during this reporting period.

  1. Summary of Changes

No changes associated with the Investigative Analysis during this reporting period.

  1. Summary of Contacts

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

  1. Summary of Problems

No problems related to the Investigative Analysis during this reporting period.

  1. Actions Taken to Correct Problems

No actions to correct problems necessary during this reporting period.

  1. Projected Work for the Next Quarter

Continued work on investigation results to closure criteria.

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

No daily reports, inspection reports, or data related to risk assessment generated during this reporting period.

Task VI:  Treatability Studies

Task Description

This task may include a Treatability Study Program, if so directed by EPA.  Treatability studies are performed to determine the applicability of corrective measure technologies to conditions or problems at or resulting from waste management activities at CSSA.  Where it is determined by EPA that treatability testing is necessary, candidate technologies will be identified, a treatability study Work Plan will be prepared, the treatability study(ies) will be implemented, and a treatability study report will be prepared.

Completion of this task is partially funded.  Currently planned and funded (under RL33) is completion of a treatability study report for SWMU B-20, and continued operations and maintenance of the soil vapor extraction (SVE) system at SWMU B-3 (under RL74 and RL83).

Activities this Quarter

As part of the Task II Interim/Stabilization Measures, a treatability study for stabilization of the excavated soils was continued during Quarter 7.  The ESTCP and UFA Ventures, Inc. are demonstrating a stabilization process using PIMS on soils contaminated with lead and other metals.  The PIMS laboratory benchscale treatability studies were completed during Quarter 5.  A work plan is scheduled for submittal to CSSA and ESTCP for review in January 2001, with implementation of a field scale treatability study scheduled to begin during reporting Quarter 8.

SVE laboratory and field data were collected at SWMU B-3 in accordance with the SVE operations and monitoring (O&M) schedule detailed in the Soil Vapor Extraction Test Work Plan, Second Addendum (December 1999).  During the past five months of operation, the extraction flow rate from the SVE system was increased to approximately 4,500 feet per minute (or 98 cfm).  The flow at various VEWs was adjusted, as needed, to maintain the main exhaust flow at or near 98 cfm.  This flow rate is 10 cfm below the TNRCC-approved standard exemption for emissions from the SVE system.

According to the data collected through 10 months of operation, the SVE system has not resulted in contaminant emissions in exceedance of the standard exemption for the B-3 SVE system.  Data from the 10-month sampling event were verified, but validation and review were not completed for inclusion into the final report during the subject reporting period.  Assuming that the system was 90% operational during the initial 10 months of continuous extraction at SWMU B-3, and using average removal rates measured initially at 5 months and at 10 months, over 215 pounds of VOCs have been removed.  An estimated 119 pounds of TCE, 60 pounds of cis-1-2-DCE, and 36 pounds of PCE are included in this mass removal estimate.

Perched water samples were collected from four of the B-3 VEWs.  Analyses of these samples indicated TCE at concentrations ranging from 110 mg/L to 27,000 mg/L.  In addition, high concentrations of TCE breakdown products were observed.  This information indicates that significant VOC contamination remains at SWMU B-3.

During Quarter 6, the seal on several of the SWMU B-3 VEWs were observed to be broken.  This resulted in removing four VEWs from the extraction network, including VEW-08, VEW‑11, VEW-14, and VEW-18, and significantly restricting the flow from VEW-10.  With the onset of numerous rainfall events during the subject reporting period, it was observed that the seals in all but one of these VEWs was re-established.  It can be concluded from this observation that the apparent leaks in the VEW bentonite seals observed during Quarter 6 were caused by excessively dry conditions.  The only exception was VEW-08, which continued to exhibit free flow conditions and high oxygen levels indicative of an open and direct pathway to the surface.  The bentonite seal around this VEW has experienced a significant amount of settling, providing further evidence of a likely disruption of the VEW’s seal.

Resampling of the soil samples collected as part of the initial SWMU B-3 treatability study (1997) was completed during this reporting period.  The data from this resampling event is continuing to be reviewed and evaluated.

A transducer was set in one of the SWMU B-3 VEWs (VEW-01) to collect data regarding the infiltration of water into and through the trench following significant rainfall events.  A hermit data logger recorded information on water levels on a 15-minute frequency.  The weather station at Well 16 and the transducer in VEW-01 recorded data from early October through December 20, 2000.  This recorded data should provide valuable insight on infiltration and recharge of precipitation into and through the trench for future evaluations on the dynamics of flow and recharge characteristics of the water within the trench.

  1. Percent Complete

This task makes up approximately 10% of the RFI phase.  The amount of effort needed to accomplish this task is not yet known because analytical data 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.

  1. Summary of Findings

UFA Ventures recently completed a bench-scale treatability study on a small sample of B-20 sifted soils.  On average, the soils contained about 2,000 mg/kg lead.  Three leaching tests were run on the soil:  one with rainwater, one using TCLP methodology, and one using SPLP methodology.  The TCLP extraction moved the most (between 2 and 30 ppm) lead into solution.  These three leaching tests were also run on soil mixed with apatite.  TCLP extract results on the soil mixed with apatite were an order of magnitude lower.  UFA Ventures prepared a draft work plan for the field demonstration of the PIMS remedial effort during Quarter 7.  It is expected that the field demonstration of PIMS will be initiated during Quarter 8.

Analytical data from the 10-month emissions sampling event (performed November 6 and 7, 2000) at B-3 were verified, but validation and review are not completed.  The results continue to suggest that the contaminant levels present in the main exhaust emissions remain relatively stable when compared to the initial and 5-month sample results.  In some specific VEWs tested, the results indicate a continued increase in the contaminant levels from some VEWs, suggesting that the radius of influence for those tested VEWs may be broadening to include a larger treatment area.  The increase may also result from increased contaminant mobility facilitated by the higher moisture conditions encountered at the site prior to the November sampling event.

  1. Summary of Changes

No changes associated with the treatability studies during this reporting period.

  1. Summary of Contacts

No contacts related to the treatability studies were made during this reporting period.

  1. Summary of Problems

No problems related to the O&M activities at SWMU B-3 or the B-20 treatability studies during this reporting period.

  1. Actions Taken to Correct Problems

No actions to correct problems necessary during this reporting period.

  1. Projected Work for the Next Quarter

The SVE unit at SWMU B-3 will remain on a bi-weekly system check schedule and was continued until January 23, 2001.  The final SVE system assessment report is tentatively scheduled for submittal during the next quarter (Quarter 8).

It is anticipated that UFA Ventures will finalize the field demonstration work plan for PIMS and initiate the field demonstration effort during the next quarter.

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

No daily reports, inspection reports, or data related to the treatability studies were generated during this reporting period.

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 this task is partially funded.  Progress reports for two years (August 1999 – May 2001) are funded under RL83 of the AMC contract.  Six additional progress reports (July 2001 – October 2002) are funded under DO 5084 of the AETC contract.

  1. Percent Complete

This task makes up approximately 6% of the RFI phase.  The percent complete is unknown because the number of treatability studies necessary is currently unknown, however it is estimated at approximately 6%.

  1. Summary of Findings

No findings associated with the progress reports during this reporting period.

  1. Summary of Changes

No changes associated with the progress reports during this reporting period.

  1. Summary of Contacts

No contacts related to the progress reports were made during this reporting period.

  1. Summary of Problems

No problems related to the Progress Reports during this reporting period.

  1. Actions Taken to Correct Problems

No actions to correct problems necessary during this reporting period.

  1. Projected Work for the Next Quarter

Progress Report for Quarter 6 will be submitted.

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

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