Hillcrest Community Environmental Hillcrest Community Environmental InvestigationInvestigation

No Conflict of InterestNo Conflict of Interest Geo Strata is not affiliated with and Geo Strata is not affiliated with and does not hold contracts with the oil & does not hold contracts with the oil &

gas refining industry.gas refining industry.

March 25, 2010March 25, 2010

Texas Commission on Texas Commission on Environmental QualityEnvironmental Quality

Geo Strata Geo Strata Environmental Environmental Consultants, Inc.Consultants, Inc.

Founded in San Antonio, Texas in 1991Founded in San Antonio, Texas in 1991 Certified Woman-Owned Small BusinessCertified Woman-Owned Small Business Main Offices are located in San AntonioMain Offices are located in San Antonio TCEQ Registered Corrective Action TCEQ Registered Corrective Action

Specialist and Texas Licensed Specialist and Texas Licensed Geoscience FirmGeoscience Firm

TCEQ PST Contractor for 8+ yearsTCEQ PST Contractor for 8+ years 70% of current workload - Government 70% of current workload - Government

Entity clientsEntity clients 30% of current workload 30% of current workload –– Private Clients Private Clients

(primarily small business)(primarily small business)

Geo StrataGeo Strata

Geo Strata Staff Geo Strata Staff Includes:Includes:

GeologistsGeologistsHydrogeologists Hydrogeologists Environmental Environmental

Scientists Scientists Field Technicians Field Technicians

Support StaffSupport Staff

Project Organization Project Organization ChartChart

Michael HoneycuttTCEQ

Project Sponsor

Neeraja ErraguntlaTCEQ

Project Toxicologist

Omar ValdezTCEQ

Project Manager

Cheri KriegGeo StrataH&S Officer

Suzanne GreenGeo Strata

Project Manager

Steve ThornleyBeacon Environmental

ServicesLaboratory Manager

Taryn ScholzQuality Assurance

AssociatesQA Specialist

Hillcrest Phase 1Hillcrest Phase 1 Conduct Passive Soil Vapor SurveyConduct Passive Soil Vapor Survey

Goal: To identify optimal locations for permanent monitor wellsGoal: To identify optimal locations for permanent monitor wells

Typical Installation Set-upTypical Installation Set-up

Quality Assurance - Installation Quality Assurance - Installation & Removal Activities& Removal Activities

All samples will be installed and collected by All samples will be installed and collected by experienced Scientist(s) and Technician(s) experienced Scientist(s) and Technician(s) Using standard methods and procedures specified in the Using standard methods and procedures specified in the

Field Sampling Plan (FSP).Field Sampling Plan (FSP).

Custody records and custody seals will be used.Custody records and custody seals will be used. Show control during sample transfer and to maintain the Show control during sample transfer and to maintain the

security and integrity of samples.security and integrity of samples.

Each sample will be collected in duplicate.Each sample will be collected in duplicate. In the event that any problem is encountered with the first In the event that any problem is encountered with the first

analysis.analysis. Non-disposable equipment will be decontaminated Non-disposable equipment will be decontaminated

between each sample.between each sample.

Independent Data ReviewIndependent Data Review

Two partners (Dr. Donald A. Flory and Ms. Taryn Two partners (Dr. Donald A. Flory and Ms. Taryn G. Scholz) in business since 1984G. Scholz) in business since 1984

Hired as a subcontractor through Geo Strata, but Hired as a subcontractor through Geo Strata, but does notdoes not answer to Geo Strata, TCEQ, or the answer to Geo Strata, TCEQ, or the laboratorylaboratory

Experience includes review and validation of data Experience includes review and validation of data for over 10,000 samples from all types of sites for over 10,000 samples from all types of sites (federal Superfund, Texas Superfund, TRRP, (federal Superfund, Texas Superfund, TRRP, Louisiana RECAP, various EPA Regions)Louisiana RECAP, various EPA Regions)

Performed by QAA, L.L.C. Performed by QAA, L.L.C. (Quality Assurance (Quality Assurance

Associates)Associates)www.qaallc.com

Quality Control Samples - Quality Control Samples - FieldField

Ambient field blanks (minimum two for the event) – PSG sampler exposed to air just like samples during installation and retrieval.

Used to determine if samples are affected by exposure to ambient air during installation or retrieval

Equipment rinsate blanks (one per day) – laboratory grade water poured over the borehole drilling equipment.

Used to determine if the decontamination of borehole drills was adequate to avoid cross contamination between samples

Quality Control Samples – Quality Control Samples – Field Field

Trip blanks (one per shipment) – PSG sampler (unopened) stored and transported with samples during installation and retrieval.

Used to assess the potential introduction of contaminants from sample containers or during the transportation and storage procedures

Field duplicates (one per 10 samples) – second set of adsorbent cartridges collected simultaneously with a sample and transported in same sample vial

Used to assess the precision of the sample collection and analytical procedures

Quality Assurance - Sample Quality Assurance - Sample AnalysisAnalysis

All samples will be analyzed by an experienced laboratory, All samples will be analyzed by an experienced laboratory, dedicated to PSG analyses, that has a quality assurance dedicated to PSG analyses, that has a quality assurance program and proficiency testing program that meets program and proficiency testing program that meets NELAC requirements.NELAC requirements.

Beacon Environmental Services Beacon Environmental Services www.www.beaconbeacon-usa.com -usa.com

A rigorous, EPA-approved analytical method (SW-846 A rigorous, EPA-approved analytical method (SW-846 8260) will be used that uses GC/MS instrumentation, 8260) will be used that uses GC/MS instrumentation, internal standard quantitation, and five-point calibration to internal standard quantitation, and five-point calibration to produce definitive data with low detection levels (1-5 ng) produce definitive data with low detection levels (1-5 ng)

A full target analyte list of approximately 40 VOCs will be A full target analyte list of approximately 40 VOCs will be reported including BTEX, chlorinated hydrocarbons, and reported including BTEX, chlorinated hydrocarbons, and PAHs (Naphthalene and 2-Methylnaphthalene)PAHs (Naphthalene and 2-Methylnaphthalene)

A complete data package including all required reportable A complete data package including all required reportable data plus laboratory review checklists and necessary data plus laboratory review checklists and necessary exception reports will be submitted.exception reports will be submitted.

Quality Control Samples - Quality Control Samples - LaboratoryLaboratory

Laboratory blanks (one per 20 samples) – Laboratory blanks (one per 20 samples) – clean adsorbent cartridges that are clean adsorbent cartridges that are prepared and analyzed just like the prepared and analyzed just like the samplessamples Used to determine if samples are affected by Used to determine if samples are affected by

any contamination introduced in the laboratoryany contamination introduced in the laboratory Laboratory control samples (one per 20 Laboratory control samples (one per 20

samples) – clean adsorbent cartridges that samples) – clean adsorbent cartridges that are spiked with a known amount of target are spiked with a known amount of target analytes and then prepared and analyzedanalytes and then prepared and analyzed Recoveries are used to determine accuracy of Recoveries are used to determine accuracy of

analysis on a clean sample matrixanalysis on a clean sample matrix

Quality Control Samples - Quality Control Samples - LaboratoryLaboratory

Matrix spike/matrix spike duplicate samples (one per Matrix spike/matrix spike duplicate samples (one per 20 samples) – Samples that are spiked with a known 20 samples) – Samples that are spiked with a known amount of target analytes and then prepared and amount of target analytes and then prepared and analyzed.analyzed. Recoveries are used to determine accuracy of Recoveries are used to determine accuracy of

analysis on the site sample matrixanalysis on the site sample matrix Surrogates (three used for every sample) – Deuterated Surrogates (three used for every sample) – Deuterated

compounds that are added to each sample.compounds that are added to each sample. Recoveries are used to determine accuracy and Recoveries are used to determine accuracy and

validity of each analysisvalidity of each analysis Internal standards (four used for every sample) – Internal standards (four used for every sample) –

Deuterated compounds that are added to each sample Deuterated compounds that are added to each sample and used to provide standardized quantitation.and used to provide standardized quantitation. Recoveries are used to monitor matrix effects and Recoveries are used to monitor matrix effects and

show any loss in instrument sensitivityshow any loss in instrument sensitivity

Independent Data ReviewIndependent Data ReviewReview includes:Review includes: Verifying that laboratory data package includes all required dataVerifying that laboratory data package includes all required data

Assuring that proper custody procedures and sample handling Assuring that proper custody procedures and sample handling procedures have been usedprocedures have been used

Confirming that appropriate analytical methods and reporting Confirming that appropriate analytical methods and reporting procedures have been usedprocedures have been used

Verifying that all QC samples (blanks, spikes, duplicates, etc.) Verifying that all QC samples (blanks, spikes, duplicates, etc.) have been included at the required frequencyhave been included at the required frequency

Evaluating the results of the QC samples against criteria Evaluating the results of the QC samples against criteria established in the FSPestablished in the FSP

Determining the effect of any QC deficiencies on the data quality Determining the effect of any QC deficiencies on the data quality

Qualifying the data to indicate potential biases (if minor QC Qualifying the data to indicate potential biases (if minor QC issues) or rejection (if significant QC issues)issues) or rejection (if significant QC issues)

Thank YouThank You

We look forward to assisting the We look forward to assisting the TCEQ and the Hillcrest TCEQ and the Hillcrest Community during this phase of Community during this phase of assessment.assessment.