APPENDIX E DATA QUALITY ASSURANCE PLAN

APPENDIX E DATA QUALITY ASSURANCE PLAN

DATA QUALITY ASSURANCE PLAN HALLIBURTON FACILITY 44 LARY LOZIER ROAD BOULDER, WYOMING VRP # 58.136 REVISED DECEMBER 2011 Prepared for: HALLIBURTON ENERGY SERVICES, INC. 10200 Bellaire Boulevard P.O. Box 4574 Houston, Texas 77210-4574 Prepared by: LT ENVIRONMENTAL, INC. 4600 West 60 th Avenue Arvada, Colorado 80003 (303) 433-9788

TABLE OF CONTENTS 1.0 INTRODUCTION...1-1 1.1 BACKGROUND...1-1 1.2 PROJECT RESPONSIBILITY...1-2 1.3 PLAN ORGANIZATION...1-2 2.0 DATA QUALITY OBJECTIVES...2-1 2.1 PROJECT DQOs...2-1 2.2 DATA QUALITY SUMMARY...2-1 3.0 SAMPLE COLLECTION PROCEDURES...3-1 3.1 SAMPLING LOCATIONS AND DESIGNATION...3-1 3.1.1 Sampling Locations...3-1 3.1.2 Sample Designation...3-1 3.2 DOCUMENTATION OF SAMPLING PROCEDURES...3-3 3.3 SAMPLE COLLECTION PROCEDURES...3-3 3.4 EQUIPMENT DECONTAMINATION PROCEDURES...3-3 3.4.1 Non-Sampling Equipment...3-3 3.4.2 Sampling Equipment...3-3 3.5 INVESTIGATIVE DERIVED WASTE (IDW) HANDLING...3-3 4.0 QUALITY CONTROL PROCEDURES...4-1 4.1 SAMPLE HANDLING...4-1 4.2 SAMPLE CUSTODY...4-1 4.2.1 Field Operations...4-1 4.2.2 Laboratory Operations...4-2 5.0 CALIBRATION PROCEDURES AND FREQUENCY FOR FIELD TEST EQUIPMENT...5-1 5.1 CALIBRATION AND MAINTENANCE OF FIELD INSTRUMENTS...5-1 5.2 CALIBRATION AND MAINTENANCE OF LABORATORY EQUIPMENT...5-2 6.0 QUALITY ASSURANCE OBJECTIVES FOR MEASUREMENT DATA...6-1 6.1 FORMULAS...6-1 6.1.1 Accuracy...6-1 6.1.2 Precision...6-1 6.1.3 Completeness...6-2 i

TABLE OF CONTENTS (CONTINUED) 6.1.4 Comparability...6-2 6.1.5 Representativeness...6-3 6.2 DOCUMENTATION...6-3 7.0 DATA REDUCTION, VALIDATION, AND REPORTING...7-1 7.1 CHEMICAL DATA...7-1 7.2 FIELD MEASUREMENT DATA...7-1 7.3 DATA MANAGEMENT...7-2 7.4 REPORTING REQUIREMENTS...7-2 8.0 INTERNAL QUALITY CONTROL CHECKS FOR FIELD AND LABORATORY OPERATIONS...8-1 8.1 FIELD QUALITY CONTROL SAMPLES...8-1 8.1.1 Trip Blanks...8-1 8.1.2 Field Blanks...8-1 8.1.3 Equipment Rinseate Blanks...8-1 8.1.4 Duplicate Samples...8-1 8.2 LABORATORY QUALITY CONTROL...8-2 9.0 CORRECTIVE ACTION...9-1 9.1 RESPONSE TO OUT-OF-CONTROL EVENTS...9-1 9.2 RE-ESTABLISHMENT OF CONTROL...9-1 9.3 DOCUMENTATION...9-1 TABLE TABLE 1 SAMPLE CONTAINERS AND HOLDING CONDITIONS APPENDIX APPENDIX A FIELD FORMS ii

1.0 INTRODUCTION The Data Quality Assurance Plan (DQAP) has been prepared as part of the Full-Scale Work Plan (Work Plan) for the Halliburton Energy Services, Inc. (Halliburton) facility (project) located at 44 Lary Lozier Road near Boulder, Sublette County, Wyoming. The Site was used as a maintenance and storage facility for oil and gas well drilling equipment and chemicals. The potential contamination present includes gasoline, diesel fuel, and methanol which were stored in portable aboveground storage tanks (ASTs) in the central portion of the Site. Quality Assurance (QA) is defined as an integrated program designed for assuring reliability of monitoring procedures and measurement data. Quality Control (QC) is defined as the routine application of procedures for obtaining prescribed standards of performance in the monitoring and measuring process. 1.1 BACKGROUND As discussed in the Work Plan, tasks pertaining to sampling and analysis addressed by this DQAP are: Excavate full-scale remediation area to bedrock where impacts to the subsurface exceed Wyoming Department of Environmental Quality (WDEQ) Voluntary Remediation Program (VRP) Cleanup Levels. Clean overburden will be replaced in the excavated full-scale remediation area or used to expand the soil treatment area (STA); Sample the side walls of the excavated full-scale remediation areas to determine that the soil meets the WDEQ VRP migration to groundwater cleanup standard. Sampling will be performed in accordance with the VRP Fact Sheet #10 and the Soil Confirmation Sampling Plan; Expand the pilot study STA to allow for the treatment of impacted soil generated during full-scale activities; Reinstall any monitoring wells removed during full-scale excavation activities. Complete confirmation soil sampling from below the STA liner to verify liner integrity following the completion of full-scale soil treatment; Sample groundwater from the monitoring wells in the comingled plume area for benzene, toluene, ethylbenzene, and total xylenes (BTEX), methanol, total petroleum hydrocarbons-diesel range organics (TPH-DRO), total petroleum hydrocarbonsgasoline range organics (TPH-GRO), and polynuclear aromatic hydrocarbons (PAHs). PAH analysis will only be performed if TPH-DRO is detected. Sample groundwater from the monitoring wells in the methanol-only plume areas for methanol; and Appendix E DQAP.doc 1-1

Sample the soil in the STA for methanol to determine if a reduction in concentrations is observed. The scope of this DQAP is to present procedures which will ensure that data generated meet the requirements of the Work Plan. Data must be scientifically valid, defensible, and of known precision and accuracy. The DQAP describes the procedures and specifications that will be followed to support the collection of data which are of satisfactory quality. Adherence to these procedures will help ensure that the integrity of the samples collected is maintained, that no sampling-related contamination occurs, and that laboratory results will be representative of the actual on-site conditions. 1.2 PROJECT RESPONSIBILITY Primary responsibility for implementing the QA measures of this DQAP belongs to the LTE Project Manager (PM). The PM s responsibility is for the overall conduct of the project including adherence to contractual obligation related to QA as outlined in the Work Plan Statement of Work (SOW) and enforcement of QA standards set out in this document. It is the responsibility of the LTE Technical Director (TD) to monitor the project quality controls, discover QA problems or non-conformance, and support the PM in adherence to the QA contractual obligations. All problems or non-conformance shall be reported to the PM. As soon as practical, the TD shall propose corrective action(s), define the significance of the deficiencies, and initiate the corrective action(s). The TD has the authority to suspend field activities until the project is brought back into compliance with this DQAP. The field coordinator is responsible for overseeing all field activities and managing contractors to ensure that the work is executed according to this DQAP. 1.3 PLAN ORGANIZATION This DQAP is divided into nine sections, including this introduction: Section 2.0 presents the data quality objectives for the project; Section 3.0 discusses the sample collection procedures; Section 4.0 summarizes the QC procedures for the field and laboratory operations; Section 5.0 presents the calibration procedures for field equipment; Section 6.0 provides the QA objectives for the data obtained; Section 7.0 introduces the planned data reduction, validation, and reporting procedures; Section 8.0 contains the internal QC checks for both field and laboratory operations; and Section 9.0 outlines the corrective action procedures for data quality. Appendix E DQAP.doc 1-2

2.0 DATA QUALITY OBJECTIVES Data Quality Objectives (DQOs) are qualitative and quantitative statements which define data quality requirements based on the identified end use of the data. These objectives may be reevaluated as additional information is collected and data needs are further defined. The DQOs for the project are presented in this section. 2.1 PROJECT DQOs The DQOs for the project are to evaluate soil remediation progress during full-scale program activities and to obtain sufficient information to make the above determination through field screening and sampling of excavated soil and treated soil and groundwater. 2.2 DATA QUALITY SUMMARY A data quality summary for the Site is as follows: Overall Study Objectives - To remediate the soil and groundwater that currently exceeds cleanup levels to below cleanup levels in order to attain site closure; Appropriate Analytical Levels - Level II (all analyses, except field measurement of ph, specific conductance, temperature, and headspace screening, performed in an offsite analytical laboratory using standard, documented procedures); Data Needs - Groundwater analytical data to monitor any reductions in constituents of concern after excavation. Soil analytical data to assess whether the concentration of soils not excavated are below the VRP migration to groundwater cleanup level. Soil analytical data to monitor the treatment of impacted soil by soil composting; Constituents of Concern - Constituents of concern for the Site include: o o o o BTEX; Methanol; TPH-DRO and TPH-GRO; and PAHs (including naphthalene). Levels of Concern - Protection of potential receptors from contaminants in soil and groundwater. Protection of soil and groundwater from contaminants which exceed levels presented in the WDEQ VRP Fact Sheet #7; Required Reporting Limits - The laboratory reporting limits for soils and groundwater will be in accordance with United States Environmental Protection Agency (EPA) method-specific protocols for the selected analyses; and Planned for Collection Soil and groundwater samples. Appendix E DQAP.doc 2-1

3.0 SAMPLE COLLECTION PROCEDURES This section presents the procedures which will be used to conduct the soil and groundwater sampling program for the Site. Field measurements and sampling will be conducted in accordance with EPA procedures, specifically procedures identified in: Test Methods for Evaluating Solid Wastes (SW 846), (EPA, 1995 Third Revision or most recent revision); RCRA [Resource Conservation and Recovery Act] Groundwater Monitoring Technical Enforcement Guidance Document (TEGD) (EPA, 1986); and Methods for Chemical Analysis of Water and Wastes (MCAWW) (EPA, 1983, or most recent edition). Specific steps will be taken to minimize collection errors. These include: All samples will be collected with disposable or clean tools that have been decontaminated as outlined in Section 3.4; Disposable gloves will be worn and changed between sample collections; Sample containers will be filled quickly and completely; Soil and groundwater samples will be placed in containers in the order of volatilization sensitivity; Containers will be quickly and adequately sealed. Rims will be cleaned prior to tightening lids; Sample containers will be labeled as outlined in Section 3.1.2; and Containers will immediately be preserved as listed on Table 1. Unless specified otherwise, at a minimum, the samples will be cooled to 4 degrees Celsius, and this temperature will be maintained through delivery to the laboratory. 3.1 SAMPLING LOCATIONS AND DESIGNATION 3.1.1 Sampling Locations Field activities, sample rationale, sampling locations, and the number and type of samples to be collected are described in the Work Plan. 3.1.2 Sample Designation A formal sample identification system will be used to designate each sample taken during the site characterization activities. The identification system and the date of sample collection will provide a tracking procedure to allow for the retrieval of information about a particular sample Appendix E DQAP.doc 3-1

location. Additionally this identification system will ensure that each sample is assigned a unique sample identification that describes when and where the sample was collected. Each identification number will consist of a group of letters and numbers separated by hyphens. The components of each number and several example numbers are presented below. A single or double letter prefix will indicate the sample type and, where appropriate, the depth or interval of sample collection will be expressed numerically using ( ) to represent feet and ( ) to represent inches. Special analyses such as geotechnical will be labeled in a similar manner. FSB Floor Sample, B Full-Scale Remediation Area, SWB Side Wall Sample, B Full-Scale Remediation Area, STA Soil Treatment Area SPB Stockpile Example sample numbers follow: FSB01-13 : Floor sample in the excavated full-scale remediation area B, soil sample 01, sample collected at 13 feet below ground surface (bgs); SWB01-13 : Side wall sample in the excavated full-scale remediation area B, soil sample 01, sample collected at 13 feet below ground surface (bgs); STA01: SPB01: Treatment area soil sample 01 (depth at which sample was collected is not applicable); and Stockpile soil sample in the excavated full-scale remediation area B, soil sample 01. Groundwater samples will be labeled using the monitoring well name given during previous investigations (e.g., BH07) or the monitoring well name given for newly installed monitoring wells. QA/QC sample designations will indicate the type of QA/QC sample, date collected, and for rinseate blanks, the matrix of the associated environmental samples. The sample collection date will be part of the sample designation. The following abbreviations will be used in addition to those listed above: FB TB RB Field Blank Trip Blank Equipment Rinseate Blank For example, a rinseate blank collected during a groundwater sampling event on August 1, 2009, would be designated RB1-GW-8-1-09 and a trip blank for that event would be designated TB1- GW-8-1-09. Laboratory blind duplicate samples will be designated by a letter. For example, a Appendix E DQAP.doc 3-2

laboratory blind duplicate of a sample collected from BH07 would be designated BHA-GW, with the location recorded in the field log. 3.2 DOCUMENTATION OF SAMPLING PROCEDURES A bound field logbook will be used to document all activities conducted at the Site including borehole and monitoring well installations; field sampling activities; field screening; water level measurements; and site inspections. Each page will be numbered sequentially. The date and name of the field personnel entering information in the log (logger) will be placed at the top of the first page for that day. On finishing the day's entry, the final page will be signed by the logger, dated, and any unused space below will be marked out. All errors or mark outs on the entries will be initialed by the logger. Additional documentation will be provided in the geologic boring logs, monitoring well construction diagrams, and well development records. 3.3 SAMPLE COLLECTION PROCEDURES Soil and groundwater samples will be collected in accordance with the Work Plan and will conform to LT Environmental, Inc. (LTE) standard operating procedures for sample collection. Example forms are included in Appendix A of this DQAP in. These forms will be completed to document field collection procedures in addition to the bound field logbook. 3.4 EQUIPMENT DECONTAMINATION PROCEDURES 3.4.1 Non-Sampling Equipment Equipment not used directly for sampling, such as augers and drill pipe, will be decontaminated with high-pressure hot water. If high-pressure hot water cleaning alone is found to be ineffective, the equipment may be scrubbed with laboratory-grade detergent (i.e., Alconox ) then cleaned with high-pressure steam. The detergent wash shall be followed by a potable water rinse. Instruments used in the monitoring well borehole, such as water-level probes, will be decontaminated in the same manner as the sampling equipment, described below. 3.4.2 Sampling Equipment Equipment used for sampling will be decontaminated as follows: Scrub with laboratory-grade detergent; Rinse with potable water; and Rinse with distilled water. 3.5 INVESTIGATIVE DERIVED WASTE (IDW) HANDLING Sampling equipment will be decontaminated using distilled or potable water and laboratorygrade detergent. Decontamination water will be sprayed onto the soil in the soil treatment area. Appendix E DQAP.doc 3-3

Groundwater removed from the monitoring wells during development and purging will be collected in temporary storage tanks on site and will be sprayed onto the soil in the soil treatment area. LTE will reduce benzene concentrations in removed groundwater to 50 micrograms per liter (ug/l) by either 1) adding microbes and using aeration, 2) adding oxygen releasing compounds, or 3) passing the groundwater stored in the temporary storage tanks though a carbon filter. The groundwater will be analyzed for benzene to ensure that concentrations are below 50 ug/l prior and will be submitted to the WDEQ VRP for approval prior to applying the groundwater to the soil treatment area. IDW sampling results will be approved by the WDEQ VRP prior to application to the soil treatment area. Expendable supplies and materials will be collected and disposed of as municipal waste. These materials may include disposable gloves, overalls, boot covers, tape, plastic bags, plastic sheeting, and paper towels. Appendix E DQAP.doc 3-4

4.0 QUALITY CONTROL PROCEDURES 4.1 SAMPLE HANDLING Table 1 summarizes the types of sample containers, sample volumes, methods of preservation, and holding times for each sample matrix by analytical method. Field team members will ship samples daily where necessary to enable the laboratory to analyze the samples within the specified holding times. Corrective actions will be implemented if the holding times are exceeded. 4.2 SAMPLE CUSTODY Sample custody is an important part of the DQAP and is critical to ensuring the integrity of field sampling and laboratory analysis. In the field, appropriate collection, identification, preservation, and shipment procedures must be followed. All field activities must be documented. Laboratory receipt of samples, proper storage and preservation, holding times, and extraction of samples (if necessary) must also be documented. The sample custody and documentation procedures described in this section will be followed during sample collection (Appendix A). Each person involved with sample handling will be trained in chain-of-custody (COC) procedures prior to the implementation of the field activities. 4.2.1 Field Operations The purpose of sample handling, control, documentation, and shipping procedures is to maintain the integrity (quality and custody) of samples during collection, transportation, analysis, and reporting. All samples will be collected following EPA guidelines. Proper handling of the sample bottles prior to, during, and after sample collection includes the use of chemical resistant gloves (vinyl, neoprene, or nitrile; new gloves are used at each sampling location), proper storage of laboratory bottles, and ensuring samples bottles remain clean and capped prior to sampling. Samples will be collected using low-flow sampling equipment. Samples should be collected starting from the known cleanest area to the known highest impacted area, where possible. Samples will be transferred directly from the sampling equipment to sample bottles and placed in a cooler with ice. Volatile organic compound (VOC) samples will not be filtered or transferred from one container (bottle) to another. No headspace (air bubbles) should occur in the VOC sample bottles. This will be checked during initial sampling and when the laboratory inspects the delivered samples. COC procedures are listed below: Sample labels for all samples collected will be completed and placed on the sample bottles after they have been filled. The data on the label will include date and time, samplers initials, type of sample, location or identification number, analysis required including EPA method number, preservative, and other information such as expected contamination levels in the sample; Appendix E DQAP.doc 4-1

Sample seals will be placed on the sample cooler prior to delivery to the laboratory to preserve the integrity of the samples from the time they were collected to when they are opened in the laboratory. The seals will be dated, initialed by the sampler, and placed on the exterior of the cooler; and COC forms will be used to document sample possession from time of collection to delivery to the laboratory. A COC form will be prepared for each cooler submitted to the laboratory. Sampling personnel will note pertinent sampling information on the COC form for each of the samples contained in the cooler. Required information will include sample identification numbers, type of sample matrix, date and time of sample collection, number of bottles submitted per sample location, required analyses, preservatives used, and constituent type expected in samples (if applicable), and other miscellaneous information. 4.2.2 Laboratory Operations The PM will notify the laboratory project coordinator of anticipated field sampling activities and the subsequent transfer of samples to the laboratory. This notification will include information concerning the number and type of samples to be shipped as well as the anticipated date of arrival. To facilitate sample preparation and analysis within the specified holding times, the laboratory will track the progress of sample preparation, analysis, and report preparation. The laboratory project coordinator (or designee) will provide the field coordinator with a sample tracking report. This report will identify the laboratory sample identification, time received, condition of samples, and anticipated extraction and/or analysis. The laboratory chosen to conduct the analysis of samples will, at a minimum, check all arriving samples for integrity and note any specific observations on the original COC form. Each sample will be logged into the laboratory system by assigning it a unique sample number. This number and the field sample identification number will be recorded on the laboratory report. Samples will be stored and analyzed according to specified methods. The original COC form will be returned to the PM upon its completion for permanent storage. Appendix E DQAP.doc 4-2

5.0 CALIBRATION PROCEDURES AND FREQUENCY FOR FIELD TEST EQUIPMENT Instruments and equipment used to gather, generate, or measure environmental data will be calibrated with sufficient frequency and in such a manner that accuracy and reproducibility of results are consistent with the manufacturer's specifications. Calibration and proper maintenance of field and laboratory instruments are critical to obtaining acceptable data. Improper calibration or failure of an instrument in the field may result in improper choice of sample locations; failure to detect contamination, and inefficient and inadequate segregation of clean soils from contaminated soils; and therefore, potentially result in much higher disposal or remediation costs. Improper calibration or failure of laboratory instruments may cause invalid results which may require re-analysis, re-sampling, or in inadequate or unnecessary corrective actions. 5.1 CALIBRATION AND MAINTENANCE OF FIELD INSTRUMENTS To assure that field instruments will be properly calibrated and remain operable in the field, the following procedures will be used. Prior to each day of use, the ph meter will be calibrated with standard ph solutions; Specific conductance meters will be checked for accuracy at the beginning of each day of use. If the meter cannot be adjusted to record the specific conductance within 5 percent (%) of a standard solution, the meter will be returned to the manufacturer for calibration; The water level meter will be checked daily to assess whether the instrument is functioning properly; Dissolved oxygen (DO) meter will be field calibrated per the manufacture s specifications; Flame ionization detector (FID) and photoionization detector (PID) field instruments will be calibrated daily. For volatile and unknown potential contaminants, these instruments will be calibrated to yield "total organic vapors" in parts per million (ppm) to methane equivalent. FIDs and PIDs will be operated in accordance with the instrument's operation manual recommendations; At a minimum, operation, maintenance, and calibration will be performed in accordance with the instrument manufacturer's specifications; All standards used to calibrate field instruments will meet the minimum requirements for source and purity recommended in the instrument's operation manual; Acceptance criteria for calibration will be set depending on the potential contaminant(s) and will be within the limits set in the operations manual; and Appendix E DQAP.doc 5-1

The dates, times, and results of all calibrations and repairs to field instruments will be recorded on the appropriate field form and/or in the bound field logbook. In order to avoid and/or minimize breakdown of instruments in the field, the following procedures will be followed: All users of the instrument will be trained in the proper calibration and operation of the instrument and will be required to read the operation manual prior to initial use; All users of the instrument will be trained in routine maintenance, including battery and lamp replacement, lamp and sensor cleaning, and battery charging; Each instrument's operation and maintenance manual will be brought to the Site; Field instruments will be calibrated and inspected prior to departure to the Site. Instrument battery charge will be inspected far enough ahead of time to bring the instrument up to full charge prior to departure to the Site; and At a minimum, a source of extra batteries and lamps (if applicable) will be readily available. 5.2 CALIBRATION AND MAINTENANCE OF LABORATORY EQUIPMENT Laboratory instruments will be calibrated and maintained in accordance with procedures listed in the laboratory's QA/QC and standard operating procedures. Failure of a laboratory to follow these procedures will result in implementation of corrective actions. Appendix E DQAP.doc 5-2

6.0 QUALITY ASSURANCE OBJECTIVES FOR MEASUREMENT DATA The field and analytical data will be evaluated for detection limits, precision, accuracy, representativeness, comparability, and completeness criteria. These criteria are discussed in the following subsections. Procedures used to assess data accuracy and precision are in accordance with Guidelines Establishing Test Procedures for the Analyses of Pollutants, Appendix III, Code of Federal Regulations (CFR) Title 40, Part B6, and the respective analytical method described in Section II, Internal Quality Control Checks. Completeness is recorded by comparing the number of parameters initially analyzed with the number of parameters successfully completed. For this project a target control limit of greater than 90% will be used. 6.1 FORMULAS 6.1.1 Accuracy The degree of accuracy of a measurement is a comparison of the measured value with an accepted reference, or known true value. Accuracy of an analytical procedure is best determined by analysis of a known or spiked sample quantity. Accuracy is expressed as percent recovery (PR) and is calculated as follows: Where: A = spiked sample concentration PR = [(A-B)/C] x 100 B = measured sample concentration (without spike) C = concentration of spike added The degree of accuracy and the recovery of the analyte to be expected for the analysis of QC samples and spiked samples are dependent upon the matrix, method of analysis, and compound or element being measured. The concentration of the analyte relative to the detection limit is also a factor in determining the accuracy of the measurement. The accepted degrees of accuracy specific to this project are defined in the laboratory s QC plan. 6.1.2 Precision Precision of laboratory analytical methods will be evaluated by recording and comparing multiple measurements of the same parameter on the same exact sample under the same conditions. Relative percent difference (RPD) is calculated as follows: Where: RPD = [(x1 - x2)/x][100] Appendix E DQAP.doc 6-1

x1 = analyte concentration of first duplicate x2 = analyte concentration of second duplicate X = average analyte concentration of duplicates 1 and 2 Accepted levels of precision vary according to the sample matrix, the specific analytical method, and the analytical concentration relative to the reporting limit. The accepted levels of precision specific to this project are defined in the laboratory s QC plan. Precision of field sampling methods will be assessed in a similar manner. Duplicate field samples will be collected, when possible, in separate containers, but under identical conditions. The samples will be analyzed and RPD will be calculated, as above. Accepted levels of precision for groundwater samples will be an RPD of 30%, for sample values at least twice the sample quantitation level. Soil matrices are, by nature, not homogeneous. Therefore accepted levels of precision for soil samples will be an RPD of 50%. 6.1.3 Completeness Completeness of sample analyses will be defined by comparing the number of tests initially requested with the number of tests successfully completed and reported by the testing laboratory, and which meet validation criteria (i.e., obtained in conformance with the DQAP requirements and data quality objectives). The QA objective for completeness is 90%. Valid analytical data must be reported by the laboratory for at least 90% of the samples collected. Percent Completeness (PC) is calculated as follows: Where: PC = N A / N I x 100 N A = Actual number of valid analytical results obtained N I = Theoretical number of results obtainable under ideal conditions 6.1.4 Comparability Consistency in acquisition, handling, and analysis of samples is necessary so that the results may be compared with previous studies. Concentrations will be reported in a manner consistent with general industry practice. To support the comparability of analytical results with those obtained in previous or future testing, all samples will be analyzed by EPA approved methods, when available. The EPA recommended maximum permissible holding times for organic and inorganic parameters will not be exceeded. All standards will be traceable to National Institute of Standards and Technology (NIST) or EPA standards. Calibrations will be performed in accordance with EPA or the manufacturer s specifications, and will be checked at the frequency specified in the methods. Appendix E DQAP.doc 6-2

6.1.5 Representativeness The sample representativeness will be preserved by using correct field sample collection and handling procedures, properly decontaminating sampling equipment, and using field QC samples, where appropriate. Sample collection and equipment decontamination procedures will be followed to collect samples that are representative of on-site environmental conditions. QC samples will be collected to check and document that the procedures are providing representative samples. 6.2 DOCUMENTATION Raw data from field measurements and sample collection activities will be appropriately recorded in the bound field logbook and on field forms. As the data are used in project reports, they will be reduced and summarized, and the method of reduction will be documented in the report. The analytical laboratory will perform in-house analytical data reduction and validation under the direction of the laboratory QA officer. The laboratory QA officer is responsible for assessing data quality and advising of any data which were rated preliminary or unacceptable or other notations which would caution the data user of possible unreliability. Laboratory data reduction and reporting will be conducted under standard SW846 protocols. The laboratory will report the data in the same chronological order in which it is analyzed along with QC data. The laboratory will provide the following information in each analytical data package submitted: Cover sheets listing the samples included in the report and narrative comments describing problems encountered in analysis; Tabulated results of inorganic and organic compounds identified and quantified; Analytical results for QC sample matrix spikes, sample duplicates, initial and a continuous calibration verifications of standards and blanks, standard procedural blanks, and laboratory control samples (LCSs) or references samples; Results of internal standard responses for gas chromatography/mass spectrometry (GC/MS) analyses, if used. All other analyses used external calibration; and Tabulation of instrument detection limits determined in blanks. A systematic review of the data for compliance will be conducted with the established QC criteria based on the spike, duplicate, and blank results provided by the laboratory. An evaluation of data accuracy, precision, comparability, and completeness will be performed and presented in the analytical data report. All data generated will be computerized in a format organized to facilitate data review and evaluation. The computerized data set will include data flags from the laboratory. Appendix E DQAP.doc 6-3

7.0 DATA REDUCTION, VALIDATION, AND REPORTING Data collected during this project will be collected according to this DQAP and the Work Plan. Any apparent data collection errors will be identified by evaluation of adherence to sampling procedures and evaluation of the data compared to historical information. Questionable data will be reviewed and analyzed in order to resolve these problems. Depending on the conclusions of these evaluations, the data may be accepted, qualified, or rejected. 7.1 CHEMICAL DATA Upon receipt of the laboratory data, the following reduction, validation, and reporting scheme will be conducted by the TD or his designee: Laboratory data will be reviewed to identify whether QC information is included and that the prescribed frequency of analysis was conducted. QC information, if not included in the analytical package, can be requested from the laboratory at this time. Should the QC information not be available, the data must be qualified or rejected; QC information will be reviewed for data outside control limits, and if discovered, will be reviewed for appropriate corrective action. The data can be qualified, rejected or the laboratory requested to re-analyze the sample; and Measurement data will be analyzed in accordance with procedures presented in Section 6.1. 7.2 FIELD MEASUREMENT DATA Validation of field measurement data will be performed by qualified personnel and will include: Verifying proper calibration and frequency of calibration for equipment based on the controls and instructions provided by the manufacturer; Evaluating duplicate sample analyses; and Comparing data to existing data to assess for anomalous points. Control limits for field equipment are discussed below. The ph, temperature, conductivity test equipment will be calibrated in the field to manufacturer s specifications. The ph meter will be calibrated using factory calibration methods and buffer solutions. The meter will be calibrated daily at a minimum and more frequently if the user determines that recalibration is necessary. If the meter cannot be calibrated to match the buffer solutions within 10% accuracy, the meter will be rendered unreliable within the specified control limits and not used during the field activities until the meter is reconditioned and can be recalibrated within the specified control limits. The conductivity meter will be calibrated daily with NIST traceable conductivity calibration standards. If the meter cannot be Appendix E DQAP.doc 7-1

calibrated to match the calibration standard within 10% accuracy, the meter will be rendered unreliable within the specified control limits and not used during the field activities until the meter is reconditioned and can be recalibrated within the specified control limits; The DO multi-meter will be calibrated in the field to manufacturer s specifications. The DO meter will be calibrated using factory calibration methods to the atmosphere. The meter will be calibrated daily at a minimum and more frequently if the user determines that recalibration is necessary. If the meter cannot be calibrated within 10% accuracy, the meter will be rendered unreliable within the specified control limits and not used during the field activities until the meter is reconditioned and can be recalibrated within the specified control limits; The FID will be calibrated using 100 ppm methane calibration gas in the field on a daily basis. The frequency of calibration will be based on background readings and frequency of consistently high FID readings during use. Consistent high readings (exceeding 1,000 ppm) and constant humidity changes can alter the calibration of the unit. If consistent high FID readings are recorded, the meter will be recalibrated in the field at least twice daily. If weather conditions in the field change drastically during any one day, the FID will be recalibrated in the new weather conditions. If background readings on the FID exceed 10 ppm, the FID will be recalibrated. If the FID cannot be recalibrated to within 10 ppm of the isobutylene calibration gas, the meter will be rendered unreliable and not used during the field activities until the meter can be reconditioned and recalibrated to within the specified control limits; and The oil/water interface probe does not require field calibration prior to use. The water level indicator has an accuracy of 0.01 feet. The oil/water interface probe can determine free-phase hydrocarbon thickness of 0.01 feet or greater. Any free-phase hydrocarbons detected will be visually verified using a disposable high-density polyethylene (HDPE) bailer. 7.3 DATA MANAGEMENT After the data have been reviewed for acceptability, the data will be entered into a data base management system. Data from the laboratory will be obtained in an electronic format for direct entry into the data base. Qualifiers will be added as appropriate. Data entry will be checked by assigned personnel. 7.4 REPORTING REQUIREMENTS The analytical laboratory will provide in a timely manner all sample and laboratory QA/QC results and custody information. The laboratory data packages will include the following: Case or lab narrative; Analytical results; Appendix E DQAP.doc 7-2

Analytical batch QA/QC results (e.g., surrogate spike data, method blanks, matrix spikes, laboratory control samples, and duplicate samples, if applicable); and COC form. These data will be reviewed by the PM or designated personnel. Appendix E DQAP.doc 7-3

8.0 INTERNAL QUALITY CONTROL CHECKS FOR FIELD AND LABORATORY OPERATIONS 8.1 FIELD QUALITY CONTROL SAMPLES QA/QC, trip blanks, field blanks, equipment rinseate samples, and field duplicates will be sent to the laboratory at specified frequencies as a check on field sampling. These samples and the frequency with which collection will occur are discussed in this section. 8.1.1 Trip Blanks A trip blank is defined as a sample bottle filled by a laboratory with analyte-free laboratory reagent-grade Type II water, transported to the Site, handled like a sample but not opened, and returned to the laboratory for analysis. One trip blank per cooler will be submitted if samples are to be analyzed for VOCs or BTEX. Trip blanks will be analyzed for VOCs and/or BTEX depending on the samples being submitted. 8.1.2 Field Blanks A field blank is designed to check the purity of water used for equipment decontamination. One field blank will be collected from the tap water source. An attempt will be made to obtain the tap water used from the same source throughout the project area. Field blanks will be analyzed for the same parameters as the environmental samples. Deionized water will not be tested unless rinseate results indicate that the deionized water may be a source of contamination. One field blank will be prepared for each water source used. 8.1.3 Equipment Rinseate Blanks Equipment rinseate blanks are defined as deionized water used for decontamination by pouring over field equipment that has been decontaminated. This rinseate water is then collected and transferred to a sample bottle and analyzed for the same parameters as the environmental samples. The results of these sample analyses indicate how well the sampling equipment was decontaminated. One equipment rinseate sample will be collected from the low-flow sampling equipment after the last monitoring well has been sampled. The equipment rinseate samples will be analyzed for the same analytes as the environmental samples that are collected during the event. 8.1.4 Duplicate Samples A field duplicate is defined as two or more samples collected independently at a sampling location during a single act of sampling. One field duplicate will be collected for each medium sampled in each of the two parcels. Field duplicates shall be indistinguishable by the laboratory from other samples. Therefore, one completed sample set shall be identified with a coded or false identifier which shall be in the same format as other identifiers used with this sample matrix. Both the false and true identifiers Appendix E DQAP.doc 8-1

shall be recorded in the bound field logbook. The coded identifier will be used on the COC forms. Specific sample nomenclature is discussed in Section 3.0 of this document. Duplicate samples will be collected for each matrix sampled (e.g., soil and groundwater) at a rate of 1 per 10 samples. One duplicate must be collected for each day samples are collected. 8.2 LABORATORY QUALITY CONTROL In general, analytical procedures shall follow methods and techniques consistent with standard EPA protocol outlined in Test Methods for Evaluating Solid Waste (EPA, third revision, 1995) and included in CFR Title 40, Part 792, "Good Laboratory Practices" and Part 136 "Guidelines Establishing Test Procedures for the Analysis of Pollutants", and Methods for Chemical Analysis of Water and Wastes (EPA, 1983). Specifically for the performance and compliance analytical monitoring, EPA methods described will be used. The laboratory standard operating procedures, general practices, and analytical QC samples will include the following. All chemical reagents will be of laboratory-grade (or equivalent) or higher quality, if obtainable. Each new lot of reagent-grade chemicals shall be tested for quality of performance and documented in laboratory records; Laboratory deionized water (reagent-grade water) will be tested to demonstrate that contaminant levels are below the detection limits for the applicable analytical procedures; A laboratory blank will be analyzed with all aqueous samples submitted during the performance and compliance monitoring. The method blank sample will be processed through all procedures, materials, reagents, and lab ware used for sample preparation and analyzed at a frequency of 1 per 20 samples or 1 per analytical batch, whichever is more frequent; Initial calibration must be performed as specified in the methods for laboratory protocols. A check standard can provide information on the accuracy of instrumental performance and response consistency, independent of various sample matrices and of the sample preparation procedures; Method Control Samples (MCS) will be prepared by the laboratory using reagentgrade water and spiked with specific concentrations of reagent-grade chemical. The MCS is a QC check sample that is carried along through the entire sample prep/analysis sequence. The frequency for the inclusion of control samples is 1 in 20; and A Matrix/Matrix Spiked Sample must be analyzed with every batch of samples submitted to the laboratory or 1 for every 20 samples, whichever is more frequent. Matrix spikes will be of material submitted to the laboratory from the Site. The matrix/matrix spiked sample will be spiked with the analyte(s) of interest by the laboratory. Appendix E DQAP.doc 8-2

9.0 CORRECTIVE ACTION The following procedures have been established to assure that conditions adverse to data quality, such as malfunctions, deficiencies, deviations, and errors are promptly investigated, evaluated, and corrected. 9.1 RESPONSE TO OUT-OF-CONTROL EVENTS All project personnel have the responsibility, as a part of normal work duties, to promptly identify, report, and solicit approved correction of conditions adverse to quality. Corrective actions may be initiated if any of the following conditions apply. Sample holding times are not attained; Predetermined acceptance standards are not attained (objectives for precision, accuracy, and completeness); Reports or data compiled are determined to be inconsistent or faulty; Equipment or instrumentation is found to be faulty; Samples and test results are not readily traceable; QA requirements have been violated; Designated approvals have been circumvented; As a result of internal system and performance audits; or As a result of a management assessment. Project management and staff monitor ongoing work performance in the normal course of daily responsibilities. Work is monitored at the Site by the field coordinator. 9.2 RE-ESTABLISHMENT OF CONTROL When a significant condition adverse to data quality is noted at the Site, laboratory, or by the subcontractor, the cause of the condition will be determined and corrective action taken (up to and including subcontractor or laboratory replacement) to preclude repetition. Condition identification, cause, reference documents, and corrective action plan will be documented and reported to the PM. Implementation of corrective action will be verified by follow-up action. 9.3 DOCUMENTATION Out-of-control events and corrective actions will be documented in writing. Any nonconformance with the established QC procedures will be identified and corrected. A nonconformance report will summarize each nonconformance condition. Corrective actions shall Appendix E DQAP.doc 9-1

be implemented and documented in the bound field logbook. A stop-work order may be initiated by the TD or PM if corrective actions are insufficient. Appendix E DQAP.doc 9-2

TABLE

TABLE 1 SAMPLE CONTAINERS AND HOLDING CONDITIONS HALLIBURTON FIELD SERVICES FACILITY BOULDER, WYOMING Matrix Method (Soil or (Extraction/ Volume of Container Preservation Maximum Parameter Liquid/Water) Analysis) Container Description of Sample Holding Time* TPH Soil 3550/8015 4 oz Glass w/tlc Cool 4 C 14 days GRO DRO Liquid 3510/8015 40 ml Glass w/tls Cool 4 C 7 days BTEX Soil 5030/8260B 4 oz Glass w/tlc Cool 4 C 14 days to analysis Liquid 5010/8260B 40 ml Glass w/tls HCl/<2 ph 14 days w/ HCl PAHs Soil 3550/8270C (SIM) 50 g or 4-8 oz Glass w/tlc Cool 4 C 14 days to analysis Liquid 3550/8270C (SIM) 1 L Glass w/tls Cool 4 C 5 days to analysis Methanol Soil 5030/8260B 4 oz Glass w/tlc Cool 4 C 14 days to analysis Liquid 5010/8260B 40 ml Glass w/tls HCl/<2 ph 14 days w/ HCl Notes: *Maximum holding time is from date of sample collection. < - less than BTEX - benzene, toluene, ethyl benzene, and total xylenes C - Celsius DRO - diesel range organics g - gram GRO - gasoline range organics HCl - hydrochloric acid L - liter ml - milliliters oz - ounce PAHs - polynuclear aromatic hydrocarbons SIM - selected ion monitoring TLC - Teflon coated lid TLS - Teflon coated septum cap TPH - total petroleum hydrocarbons

APPENDIX A FIELD FORMS

DATE SENT TO WYOMING ONE CALL: PHONE NUMBER: 1-811 CONFIRMATION NO: LOCAL FAX: LONG DIST. FAX: SENT FROM: UTILITIES LOCATE CHECKLIST TELEPHONE FAX: ALTERNATE CONTACT: WORK BEING DONE FOR: TYPE OF WORK: COUNTY: EXPLOSIVES: CITY/PLACE: ADDRESS: NEAREST INTERSECTING STREET: LOCATION OF WORK: REMARKS: RESPONDERS: Utility Phone Completion Date Cleared Contact / Confirmation

LTE BORING LOG Location Map: Compliance M Engineering M Remediation LT Environmental, Inc. 4600 W. 60th Avenue Arvada, Colorado 80003 BORING LOG/MONITORING WELL COMPLETION DIAGRAM Boring/Well Number: Project: Date: Project Number: Logged By: Drilled By: Elevation: Detector: Drilling Method: Sampling Method: Gravel Pack: Seal: Grout: Casing Type: Diameter: Length: Hole Diameter: Depth to Liquid: Screen Type: Slot: Diameter: Length: Total Depth: Depth to Water: Penetration Resistance Moisture Content Vapor (ppm) Staining Sample # Depth (ft. bgs.) Sample Run Soil/Rock Type Lithology/Remarks Well Completion 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 BORELOG.XLS Page 1 of 1

WELL CONSTRUCTION SUMMARY Sample Lithology LT Environmental, Inc. 4400 46th Avenue Denver, CO 80212 Well No. Boring No. WELL CONSTRUCTION SUMMARY Survey Location/Coords. Elevations: Ground Level Top of Casing Meas. Point DRILLING SUMMARY CONSTRUCTION TIME LOG Total Depth Start Finish Hole Diameter Task Date Time Date Time Driller Drilling Rig Bit(s) Type/Diameter Drilling Fluid Surface Casing First Water Geophys. Log Casing WELL DESIGN Filter Placement Basis: Geol. Log Geophys. Log Casing String(s): C=Casing S=Screen Cementing Depth String Depth String - - Development - - - - Other - - Casing: C1 C2 C3 C4 Screen: S1 S2 S3 S4 Centralizers Filter Material WELL DEVELOPMENT STABILIZATION TEST DATA Spec. Cond Time ph Temp. Bentonite Cement Other NOTES forms/wellcon.xls 3/22/2011

WELL DEVELOPMENT/PURGING FORM Developer's Initials: Project Name: Project Number: Well ID: Purging Method: Pump Bailer Other Date Time Initial ph Temp S.C. Dissolved Volume Casing Comments Water (C) (u-s) Oxygen Removed Volumes (Color, Turbidity, Odor, NAPL) Depth (mg/l) (gallons) Removed Casing Volume = 0.163 (for 2" diameter wells) x (Total Depth of Well from measuring point - Initial Water Depth ) = x 3 well volumes = (Use 0.653 for 4" diameter wells or 1.469 for 6" diameter wells or 0.041 for 1" diameter wells) Page of

CHAIN OF CUSTODY FORM Laboratory: To assist us in using the proper analytical methods, is this work being conducted for regulatory purposes? Client Name/Account #: LT Environmental, Inc. Compliance Monitoring? Yes No Address: 4600 West 60th Ave. Enforcement Action? Yes No City/State/Zip: Arvada, CO 80003 Report To: Project Manager: Invoice To: Telephone Number: 303-433-9788 Fax No.: 303-433-1432 TA Quote #: Sampler Name: (Print) Project ID: Sampler Signature: Project #: Preservative Matrix Analyze For: Date Sampled Time Sampled No. of Containers Shipped Grab Composite Field Filtered Ice HNO 3 (Red Label) HCl (Blue Label) NaOH ( Orange Label) H 2 SO 4 Plastic (Yellow Label) H 2 SO 4 Glass(Yellow Label) None (Black Label) Other ( Specify) Groundwater Wastewater Drinking Water Sludge Soil Other (specify): RUSH TAT (Pre-Schedule) Standard TAT Fax Results Send QC with report Sample ID / Description Special Instructions: Laboratory Comments: Temperature Upon Receipt: Relinquished by: Date Time Received by: Method of Shipment: FEDEX VOCs Free of Headspace? Y N Date Time Relinquished by: Date Time Received by Summit: Date Time