LIMITED AMBIENT AIR QUALITY EVALUATION. Town of Flower Mound August 2011 Nine Monitoring Sites Flower Mound, Denton County, Texas

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1 LIMITED AMBIENT AIR QUALITY EVALUATION Town of Flower Mound August 2011 Nine Monitoring Sites Flower Mound, Denton County, Texas Project October 4, 2011

2 A Report Prepared for: Town of Flower Mound 1001 Cross Timbers Road, Ste Flower Mound, Texas Limited Ambient Air Quality Evaluation Town of Flower Mound August 2011 Nine Monitori ing Sites Flower Mound, Denton County, Texas Kleinfelder Project No October 4, 2011 Prepared by: Paul Hamilton, OHST Project Scientist Kenneth S. Tramm, PhD, PG, CHMM Consultant 7805 Mesquite Bend, Suite 100 Irving, TX p f kleinfelder.com This document was prepared for use only by the client, only for the purposes stated, and within a reasonable time from issuance. Non-commercial, educational, and scientific use of this report by regulatory agencies is regarded as a fair use and not a violation of copyright. Regulatory agencies may make additional copies of this document for internal use. Copies may also be made available to the public as required by law. The reprint must acknowledge the copyright andd indicate that permission to reprint has been received.

3 TABLE OF CONTENTS PAGE 1 INTRODUCTION PROJECT DESCRIPTION PURPOSE AND BACKGROUND DETAILED SCOPE-OF-WORK LIMITATIONS AND EXCEPTIONS GENERAL FIELD CONDITIONS REPRESENTATIVE METEOROLOGICAL DATA TEMPERATURE MOISTURE CONDITIONS WIND CONDITIONS BAROMETRIC PRESSURE AND RELATIVE HUMIDITY FIELD INVESTIGATION SAMPLING LOCATIONS FIELD SCREENING SAMPLING METHODS LABORATORY PROGRAM QUALITY ASSURANCE/CONTROL EVALUATION RESULTS COMPARISON CRITERIA VOLATILE ORGANIC COMPOUNDS (VOCS) EVALUATION OF DATA COMPARISON WITH CAMS CONSIDERATION OF BACKGROUND AMBIENT AIR QUALITY FINDINGS AND RECOMMENDATIONS ACRONYMS AND ABBREVIATIONS TABLES 1A Ambient Air Results August 2011 VOCs 1B Ambient Air Results January July 2011 VOCs 2 Ambient Air Results RSCs 3 Ambient Air Results Carbonyls FIGURES 1 Sampling Location Map Western Area 2 Sampling Location Map Eastern Area 3-11 Sampling Location Detail Sample AA-1 through AA-13 APPENDIX Laboratory Analytical Data Sheets and Chain of Custody Documentation / DFW11R180 ii October 4, 2011 Copyright 2011 Kleinfelder

4 LIMITED AIR QUALITY EVALUATION AUGUST 2011 TOWN OF FLOWER MOUND NINE MONITORING SITES FLOWER MOUND, DENTON COUNTY, TEXAS 1 INTRODUCTION This report is a summary of work performed by Kleinfelder Central, Inc. (Kleinfelder) for the Town of Flower Mound (Flower Mound) in accordance with our authorized proposal and limited scope of work. 1.1 PROJECT DESCRIPTION The project included the evaluation of ambient air samples collected at nine locations across Flower Mound. The volatile organic compound (VOC) samples were collected over an approximate 24-hour period. Section 3.0 provides details on locations and methods utilized in this study. 1.2 PURPOSE AND BACKGROUND With the increasing natural gas exploration and production activities in North Texas, concerns over air quality impacts and potential for fugitive emissions have caused cities to supplement TCEQ, EPA, and operator monitoring to ensure degradation of the surrounding air quality is not occurring. Flower Mound has included periodic monitoring at several locations in Flower Mound to help evaluate and monitor the gas-related activities. The purpose of this Limited Ambient Air Evaluation (Evaluation) was to identify, to the extent feasible pursuant to our approved scope of work and limitations discussed in this report, current ambient air quality conditions at the time of sampling. 1.3 DETAILED SCOPE-OF-WORK The Town of Flower Mound requested the ambient air sampling to better understand current air quality conditions, including potential VOC concentrations from gas exploration and production activities, in selected portions of Flower Mound. The sampling points were consistent with the 2010 quarterly sampling. Flower Mound / DFW11R180 Page 1 of 13 October 4, 2011 Copyright 2011 Kleinfelder

5 personnel coordinated site access, where needed. Kleinfelder placed sample canisters set to collect ambient air for approximately 24 hours. The samples were then analyzed and the results of these analyses discussed in this report. The scope of work for August sampling included the installation of nine fixed sampling points within Flower Mound. Previous sampling during 2011 has been performed at similar sampling locations around Flower Mound. 1.4 LIMITATIONS AND EXCEPTIONS Kleinfelder s services were performed in accordance with generally accepted standards of care that exist in the geographic area of the air quality monitoring services at the time the services were performed. The scope of services performed was in accordance with the scope of work agreed with our client, as set forth in our proposal. Kleinfelder makes no warranties, express or implied, as to the services performed hereunder beyond those provided for in the authorizing agreement. Additionally, Kleinfelder does not warrant the work of third parties supplying information used in the report (e.g., laboratories, regulatory agencies or other third parties). Kleinfelder offers various levels of investigative and engineering services to suit the varying needs of different clients. It should be recognized that definition and evaluation of environmental conditions are a difficult and inexact science. Judgments leading to conclusions and recommendations are generally made with incomplete knowledge of the conditions present. Although risk can never be eliminated, more detailed and extensive studies yield more information, which may help understand and manage the level(s) of risk. Since detailed study and analysis involves greater expense, our clients participate in determining levels of service that provide adequate information for their purposes at acceptable levels of risk. More extensive studies, including periodic studies or field tests, should be performed, if reduced uncertainties are desired. Regulations and professional standards applicable to Kleinfelder's services are continually evolving. Techniques are, by necessity, often new and relatively untried. Different professionals may reasonably adopt different approaches to similar problems. As such, our services are intended to provide our client with a source of professional advice, opinions and recommendations based on a limited number of field observations and tests, collected and performed in accordance with the generally accepted practice that exists at the time, and may depend on, and be qualified by, information gathered previously by others and provided to Kleinfelder by our client / DFW11R180 Page 2 of 13 October 4, 2011 Copyright 2011 Kleinfelder

6 All information gathered by Kleinfelder is considered confidential and will be released only upon written directive from our client or as required by law. Findings set forth in this Evaluation resulting from these services are based upon information derived from the on-site activities and other services performed under the agreed upon scope of work, and it should be noted that actual site conditions may be subject to change over time. Certain indicators of the presence of hazardous materials or other constituents may have been latent, inaccessible, unobservable, or not present during Kleinfelder s performance of its services, and Kleinfelder cannot represent that a site contains no hazardous materials or other latent conditions beyond those identified in connection with this Evaluation. Environmental conditions at areas or portions of the project area where sampling was not conducted may vary from those encountered at actual sample locations. Kleinfelder s findings are based solely upon data generated by Kleinfelder or available to Kleinfelder at the time of our services. The samples collected as part of these services represent ambient air conditions at the time of sampling only. Samples collected at other times may reveal different conditions that are a result of operational changes in the oil and/or gas exploration, production, and transmission activities; unrelated industrial and commercial activities in the area; and meteorological changes / DFW11R180 Page 3 of 13 October 4, 2011 Copyright 2011 Kleinfelder

7 2 GENERAL FIELD CONDITIONS 2.1 REPRESENTATIVE METEOROLOGICAL DATA Weather data were obtained via from the Denton Airport weather station (KDTO) and Flower Mound monitoring station at Shiloh (CAMS 1007) for August 17 and 18, Observations of odors and local wind direction, were recorded for each sampling point at the time of sample placement and recovery. 2.2 TEMPERATURE According to the meteorological data utilized for this study, the temperature ranged from approximately 82 F to 102 F over the August 17 to 18, 2011 sampling period. 2.3 MOISTURE CONDITIONS According to the meteorological data utilized for this study, no precipitation was recorded in the study area prior to the 24-hour sampling period beginning August 17, WIND CONDITIONS According to the meteorological data utilized for this study, the wind direction varied from the southwest to south throughout the sampling period. Wind speeds on August 17, 2011 averaged five miles per hour (mph) with gusts up to eight mph. Winds on August 18, 2011 averaged approximately five mph with gusts to seven mph. 2.5 BAROMETRIC PRESSURE AND RELATIVE HUMIDITY According to the meteorological data utilized for this study, the barometric pressure ranged from approximately 29.9 to Relative humidity ranged from 19% to 52% during the August 17 to 18, 2011 sampling period / DFW11R180 Page 4 of 13 October 4, 2011 Copyright 2011 Kleinfelder

8 3 FIELD INVESTIGATION Prior to establishing the nine sampling points, Kleinfelder personnel confirmed access to general sample locations, sample placement points, and duration of air sampling with Flower Mound. Additionally, a site-specific Health and Safety Plan (HASP) was prepared and utilized by Kleinfelder during this Evaluation. The field investigation activities were performed on August 17 and 18, 2011 by Mr. Paul Hamilton of Kleinfelder. 3.1 SAMPLING LOCATIONS Figures 1 and 2 provide an overview of the sampling locations and Figures 3 through 11 show individual sampling locations. These included: ambient air sample AA-1 approximately 300 feet east of Furst Ranch Pad D; AA-2 located adjacent to the Armstrong-Huggins Pad; AA-3 near the intersection of Sunnyview Lane and High Road along the USACE nature trail; AA-4 west of the Fire Station at Shiloh Road and Cross Timbers Road (adjacent north of CAMS 1007); AA-5 on Scenic Road, northwest of the Sam Wilson Site No. 2 (Williams Facility); AA-6 located west of the parking area of Liberty Elementary School, north of Quail Run; AA-7 located along Timber Creek Road; AA-8 collected adjacent to the northern baseball field at Gerault Park; and, AA-13 on the Titan pad site. 3.2 FIELD SCREENING Prior to, during, and upon completion, Kleinfelder utilized handheld equipment to screen for VOCs at the areas being sampled. This included a handheld photo-ionization detector (PID) calibrated to isobutylene to allow evaluation of VOCs present in ambient air. The PID readings are intended to provide confirmation in the event that elevated readings are indicated in the ambient air samples / DFW11R180 Page 5 of 13 October 4, 2011 Copyright 2011 Kleinfelder

9 3.3 SAMPLING METHODS Sampling methodology included applicable elements of ASTM D (Standard Practice for Planning the Sampling of the Ambient Atmosphere), and the protocol outlined in our proposal. Certified sampling equipment for VOC sampling was obtained from Columbia Analytical Services (CAS) of Simi Valley, California (NELAP #T TX). Laboratory prepared sampling canisters were equipped with pre-calibrated 24-hour flow meters. The samplers were then connected to inert tubing and placed inside a protective shroud with tubing extended to approximately 5.5 feet above grade. The canisters were then activated and secured in the shroud with safety tabs to minimize the potential for tampering during the testing period and provide evidence if tampering had occurred. Contact information for any questions was located on each sampling container. No calls were received during the sampling period and no evidence of tampering was noted upon collection. Information concerning odors, PID readings, weather conditions, sampling times, and GPS location of the sample canisters were recorded in the field and discussed in applicable sections of this report. 3.4 LABORATORY PROGRAM The collected samples were shipped under chain-of-custody documentation to CAS. The sample analysis included analysis of volatile organic compounds VOCs by EPA Method TO-15. The tabulated analytical results and selected regulatory thresholds are presented in the attached tables. Table 1A presents results from August 2011 sampling and Table 1B presents results from previous sampling completed during January to July 2011.Results from past sampling for other constituents of concern are included in Tables 2 and 3 for reference / DFW11R180 Page 6 of 13 October 4, 2011 Copyright 2011 Kleinfelder

10 3.5 QUALITY ASSURANCE/CONTROL Kleinfelder obtained one duplicate sample (AA-8/DUP) during the collection of the other samples. The results of the duplicate sample were consistent with the results of the sample it duplicated. Measurements from the PID were utilized to confirm when elevated laboratory results would be indicated. The field screening evidence from this event did not indicate elevated concentrations of the parameters monitored. Readings collected on August 18 th indicated PID readings slightly above equipment detection limits, but not necessarily indicative of elevated concentrations that may be detectable in the air samples. No unusual odors were noted during the sample collection event / DFW11R180 Page 7 of 13 October 4, 2011 Copyright 2011 Kleinfelder

11 4 EVALUATION RESULTS This section provides a summary of our analytical results and, where available, selected regulatory threshold values for comparison. 4.1 COMPARISON CRITERIA In June 2011, the TCEQ updated the Air Monitoring Comparison Values (AMCVs), originally published in March 2010, to provide additional clarity to the regulated public concerning appropriate screening criteria for air monitoring data. Kleinfelder utilized the Short-term AMCVs (AMCVs ST ) for comparison with data from this study. Additionally, Kleinfelder also included the December 2010 TCEQ short-term (acute) ESLs as published by the TCEQ for the identified chemicals of concern (COCs) for reference purposes. The TCEQ Toxicology Division developed these regulatory thresholds in accordance with Guidelines to Develop Effects Screening Levels, Reference Values, and Unit Risk Factors (RG-442; November 2006). 4.2 VOLATILE ORGANIC COMPOUNDS (VOCS) VOC concentrations measured at Flower Mound sample locations included the following: Compound Maximum Maximum Compound Concentration Concentration Acetone 18 ppbv n-hexane 0.73 ppbv Acetonitrile 1.3 ppbv 4-Methyl-2-pentanone (MIBK) 0.089J ppbv Acrolein 1.1J ppbv Methyl Butyl Ketone (2-Hexanone) 0.22J ppbv Acrylonitrile 0.19J ppbv Methylene Chloride* 0.67 ppbv Alpha-pinene 0.45 ppbv Naphthalene 0.092J ppbv Benzene 0.21J ppbv n-nonane 0.88 ppbv n-butyl Acetate 0.086J ppbv n-octane 0.51 ppbv Tert-butyl alcohol 0.23J ppbv 2-Propanol (isopropyl alcohol) 1.8 ppbv Carbon disulfide 2.3J ppbv 2-Butanone (MEK) 1.3J ppbv Carbon Tetrachloride 0.069J ppbv Propene 0.46J ppbv Chloromethane 0.22J ppbv Toluene 4 ppbv Cyclohexane 2.7 ppbv Trichloroethylene 0.16J ppbv Dibromochloromethane 0.021J ppbv Trichlorofluoromethane 0.3 ppbv Dichlorodifluoromethane 0.45 ppbv 1,1,2-Trichlorotrifluoroethane 0.067J ppbv / DFW11R180 Page 8 of 13 October 4, 2011 Copyright 2011 Kleinfelder

12 Compound Maximum Maximum Compound Concentration Concentration d-limonene 0.29 ppbv 1,2,4 Trimethylbenzene 0.12J ppbv Ethanol (Ethyl Alcohol) 15 ppbv Vinyl Acetate 1J ppbv Ethylbenzene 0.13J ppbv m&p Xylene 0.46 ppbv Ethyl Acetate 14 ppbv o-xylene 0.17J ppbv Heptane 0.19J ppbv Notes: 1. J = Compound was detected above the detection limit, but below the reporting limit, therefore the concentration reported is considered approximate. 2. * = Compound was detected in the blank sample analyzed at the laboratory EVALUATION OF DATA As noted in Table 1A (following report text), none of the identified VOCs exceed the AMCVs ST. Additionally, none of the identified VOCs exceed the ESLs ST. Further, many are within ranges for ambient background noted for VOCs in previous monitoring and as noted below COMPARISON WITH CAMS 1007 In October 2010, the TCEQ established Flower Mound Shiloh monitoring station (CAMS 1007), an air quality monitoring station located near the Fire Station on Shiloh Road. The station is equipped with an automated gas chromatograph (GC) that measures values of 53 VOCs on an hourly basis. Data from the station are available for review within hours of collection via the internet. The station is designed to measure the ambient air quality in Flower Mound. Kleinfelder reviewed the VOC monitoring results reported by the TCEQ from their CAMS In general, the concentrations observed at the Shiloh monitoring station are consistent with the results observed at AA-4 immediately north of the monitoring station as well as those observed during this study. Benzene in the AA-4 sample was observed at a cumulative 24-hour concentration of 0.13 ppbv and the Shiloh monitoring station identified a maximum hourly concentration of 0.12 ppbv on August 17, 2011 and 0.18 ppbv on August 18, The maximum hourly concentration of benzene for the month of August at the Shiloh monitoring station was 0.28 ppbv. Monthly average concentrations observed in August 2011 at the Shiloh monitoring station were: / DFW11R180 Page 9 of 13 October 4, 2011 Copyright 2011 Kleinfelder

13 ethane (6.46 ppbv), benzene (0.08 ppbv), toluene (0.22 ppbv) ethylbenzene (0.02 ppbv), 1,2,4 trimethylbenzene (0.03 ppbv), CONSIDERATION OF BACKGROUND AMBIENT AIR QUALITY As with many VOCs, several can be found in the urban environment due to both natural and anthropogenic contributions. As shown in the table below, the observed concentrations from the August 2011 monitoring appear to be generally consistent with published median to maximum background ambient air concentrations observed in other urban environments (ASTM 2008). Selected VOC Air Results in U.S. Studies Compound New* Residential Air Ambient Outdoor Air Median Maximum Median Maximum Benzene Toluene Ethylbenzene m/p Xylene o Xylene ,3,5 Trimethylbenzene < ,2,4 Trimethylbenzene < Tetrachloroethene (PCE) Trichloroethene (TCE) Chloroform Vinyl Chloride ASTM E All concentrations presented as ppbv *Identified in new construction The above table is provided to outline published ambient indoor and outdoor VOC concentrations found in urban settings. It is important to understand possible contributions to air quality from sources often found in urban and suburban surroundings. These can include emissions from operational gas stations, dry cleaners, automobile exhaust, diesel engine exhaust, incomplete combustion byproducts from boilers, heaters, furnaces, and other activities where volatile compounds may be associated with site activities / DFW11R180 Page 10 of 13 October 4, 2011 Copyright 2011 Kleinfelder

14 5 FINDINGS AND RECOMMENDATIONS Kleinfelder has prepared the following findings and recommendations based on the air quality evaluation: Based on the results of the assessment, a limited number of VOCs were detected above method detection limits in the ambient air samples collected across Flower Mound. However, none of the VOCs, exceeded the available AMCV ST criteria. The observed concentrations appear to be consistent with background ambient air concentrations observed in similar urban environments and consistent with the earlier sampling in Flower Mound and collected by others in similar environments. While the current ambient air observations appear to be consistent with urban ambient air and not indicative of significant releases of fugitive emissions from the nearby natural gas activities in and/or surrounding Flower Mound, the changing nature of the exploration, production, and transmission activities may necessitate periodic evaluation to provide additional confirmation. Kleinfelder recommends continued use of field monitoring equipment by Flower Mound staff to supplement the ambient quality monitoring being performed by the TCEQ to ensure significant releases from operation equipment can be identified and addressed in an effective and timely manner as possible. It may also be prudent to request information from the operators concerning their current monitoring program so the Flower Mound s efforts could be used to supplement these activities. Kleinfelder recommends that the results of this air quality evaluation be provided to the TCEQ for inclusion in their ongoing review of ambient air quality in Denton County and continued monitoring within Flower Mound be incorporated into the Flower Mound s ongoing air quality and gas operation requirements. Monthly monitoring is scheduled to continue in September / DFW11R180 Page 11 of 13 October 4, 2011 Copyright 2011 Kleinfelder

15 6 ACRONYMS AND ABBREVIATIONS A listing of common acronyms associated with investigation activities has been provided to aid the presentation of our findings. Additional acronyms may be defined within the text of this report. AMCV AMSL AST ASTM BGS COC ESL EPA FID HASP Kleinfelder MSDS PCL PID ppbv PST QA QC RAL RCRA RRC RSC SVOCs TCEQ TICs TOX TPH TRRP TWDB ug/m 3 USACE USGS VOCs Air Monitoring Comparison Value Above mean sea level Aboveground storage tank ASTM International Below Grade Surface Chemicals of Concern Effects Screening Level United States Environmental Protection Agency Flame Ionization Detector Health and Safety Plan Kleinfelder Central, Inc. Material Safety Data Sheet Protective Concentration Level Photo Ionization Detector Parts per billion by volume TCEQ Petroleum Storage Tank Program Quality assurance Quality control Residential Assessment Level Resource Conservation and Recovery Act Texas Railroad Commission Reduced Sulfur Compound Semi-volatile Organic Compounds Texas Commission on Environmental Quality Tentatively Identified Compounds Total Organic Halides Total Petroleum Hydrocarbons Texas Risk Reduction Program Texas Water Development Board micrograms per cubic meter U.S. Army Corps of Engineers United States Geological Survey Volatile Organic Compounds / DFW11R180 Page 12 of 13 October 4, 2011 Copyright 2011 Kleinfelder

16 TABLES

17 Table 1A - VOC Ambient Air Results - August 2011 Sample Name: Sample Initiation Date: Sample Interval: AA-1 AA-2 AA-3 AA-4 AA-5 AA-6 AA-7 AA Chemical of Concern CAS # ST ESL AMCVs PQL Result PQL Result PQL Result PQL Result PQL Result PQL Result PQL Result PQL Result PQL Result PQL Result ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv Acetone h Allyl chloride (3-chloro-1-propene) h NE 0.22 ND 0.28 ND 0.2 ND 0.31 ND 0.26 ND 0.26 ND 0.29 ND 0.25 ND 0.29 ND 0.3 ND Benzene h J J J J J J J J J J Benzyl Chloride h NE 0.14 ND 0.17 ND 0.12 ND 0.18 ND 0.16 ND 0.16 ND 0.17 ND 0.15 ND 0.17 ND 0.18 ND Bromodichloromethane h NE ND ND ND ND ND ND ND ND ND 0.14 ND Bromoform h NE ND ND ND ND ND ND ND ND ND ND Bromomethane (Methyl Bromide) h ND 0.23 ND 0.16 ND 0.25 ND 0.21 ND 0.21 ND 0.23 ND 0.2 ND 0.23 ND 0.24 ND 1,3-Butadiene o ND 0.4 ND 0.29 ND 0.43 ND 0.37 ND 0.37 ND 0.41 ND 0.35 ND 0.41 ND 0.42 ND tert-butyl alcohol (2-methyl-2-propanol) h NE 0.46 ND 0.58 ND J 0.63 ND 0.54 ND 0.53 ND 0.6 ND 0.52 ND J 0.61 ND Carbon disulfide h NE 2.2 ND 2.8 ND 2.1 ND 3.1 ND 2.6 ND 2.6 ND 2.9 ND 2.5 ND J 3 ND Carbon tetrachloride h J ND J J J J J J J J Chlorobenzene h ND 0.19 ND 0.14 ND 0.21 ND 0.18 ND 0.18 ND 0.2 ND 0.17 ND 0.2 ND 0.2 ND Chloroethane h ND 0.33 ND 0.24 ND 0.36 ND 0.31 ND 0.31 ND 0.34 ND 0.3 ND 0.34 ND 0.35 ND Chloroform h ND 0.18 ND 0.13 ND 0.2 ND 0.17 ND 0.17 ND 0.19 ND 0.16 ND 0.19 ND 0.19 ND Chloromethane (Methyl Chloride) h ND J 0.31 ND J J J J J J J 2-Chlorotoluene (NA) o NE NA NA NA NA NA NA NA NA NA NA Cyclohexane h J J J J J J Dibromochloromethane h NE ND 0.1 ND J 0.11 ND ND ND 0.11 ND ND 0.11 ND 0.11 ND 1,2-Dibromoethane (Ethylene Dibromide) h ND 0.11 ND ND 0.12 ND 0.11 ND 0.11 ND 0.12 ND 0.1 ND 0.12 ND 0.12 ND 1,2-Dichlorobenzene (m-dichlorobenzene) h NE 0.12 ND 0.15 ND 0.11 ND 0.16 ND 0.14 ND 0.13 ND 0.15 ND 0.13 ND 0.15 ND 0.15 ND 1,3-Dichlorobenzene (o-dichlorobenzene) h NE 0.12 ND 0.15 ND 0.11 ND 0.16 ND 0.14 ND 0.13 ND 0.15 ND 0.13 ND 0.15 ND 0.15 ND p-dichlorobenzene (1,4-dichlorobenzene) h NE 0.12 ND 0.15 ND 0.11 ND 0.16 ND 0.14 ND 0.13 ND 0.15 ND 0.13 ND 0.15 ND 0.15 ND 1,2-Dichloroethane h ND 0.22 ND 0.16 ND 0.24 ND 0.2 ND 0.2 ND 0.22 ND 0.19 ND 0.22 ND 0.23 ND 1,1-Dichloroethane h ND 0.22 ND 0.16 ND 0.24 ND 0.2 ND 0.2 ND 0.22 ND 0.19 ND 0.22 ND 0.23 ND 1,1-Dichloroethylene h ND 0.22 ND 0.16 ND 0.24 ND 0.21 ND 0.2 ND 0.23 ND 0.2 ND 0.23 ND 0.23 ND cis-1,2-dichloroethene h NE 0.18 ND 0.22 ND 0.16 ND 0.24 ND 0.21 ND 0.2 ND 0.23 ND 0.2 ND 0.23 ND 0.23 ND trans-1,2-dichloroethene h NE 0.18 ND 0.22 ND 0.16 ND 0.24 ND 0.21 ND 0.2 ND 0.23 ND 0.2 ND 0.23 ND 0.23 ND 1,2-Dichloropropane h ND 0.19 ND 0.14 ND 0.21 ND 0.18 ND 0.18 ND 0.2 ND 0.17 ND 0.2 ND 0.2 ND cis-1,3-dichloropropene h ND 0.19 ND 0.14 ND 0.21 ND 0.18 ND 0.18 ND 0.2 ND 0.17 ND 0.2 ND 0.2 ND trans-1,3-dichloropropene h NE 0.15 ND 0.19 ND 0.14 ND 0.21 ND 0.18 ND 0.18 ND 0.2 ND 0.17 ND 0.2 ND 0.2 ND 1,4-Dioxane h NE 0.19 ND 0.24 ND 0.18 ND 0.27 ND 0.23 ND 0.22 ND 0.25 ND 0.22 ND 0.25 ND 0.26 ND Ethanol (Ethyl Alcohol) h NE J Ethylbenzene o ND J J 0.22 ND 0.19 ND 0.19 ND 0.21 ND J J 0.21 ND Ethyl Acetate h Ethyltoluene (p-ethyltoluene) h ND 0.18 ND 0.13 ND 0.19 ND 0.17 ND 0.16 ND 0.18 ND 0.16 ND 0.18 ND 0.19 ND Trichlorofluoromethane o Dichlorodifluoromethane (Freon 12) h ,1,2-Trichlorotrifluoroethane (Freon 113, Freon TF) h NE J J J J J J J J J J 1,2-Dichlorotetrafluoroethane (Freon 114) h NE 0.1 ND 0.13 ND ND 0.14 ND 0.12 ND 0.12 ND 0.13 ND 0.11 ND 0.13 ND 0.13 ND Heptane h J J J J J J J J J J Hexachloro-1,3-butadiene h NE ND ND 0.06 ND 0.09 ND ND ND ND ND ND ND n-hexane h J J J J J J J J Isopropylbenzene (Cumene) o ND ND 0.13 ND ND ND ND ND ND ND 0.19 ND Methylene Chloride* h J J,B J,B J,B J,B B ,B J,B B J,B Methyl Butyl Ketone (2-Hexanone) h J J J J J J J J J 2-Butanone (MEK) o J J J J J J J J J J 4-Methyl-2-pentanone (MIBK) h J J J 0.23 ND 0.2 ND 0.2 ND J J J J Methyl methacrylate o NE 0.34 ND 0.43 ND 0.31 ND 0.47 ND 0.4 ND 0.4 ND 0.44 ND 0.38 ND 0.44 ND 0.45 ND MTBE o ND 0.24 ND 0.18 ND 0.26 ND 0.23 ND 0.22 ND 0.25 ND 0.22 ND 0.25 ND 0.26 ND Naphthalene o ND 0.17 ND J ND 0.16 ND 0.15 ND ND ND ND ND 2-Propanol (isopropyl alcohol) o NE J J Propene ** (propylene) SA h 13, J J J J 0.48 ND J 0.53 ND J J J Styrene o ND 0.21 ND 0.15 ND 0.22 ND 0.19 ND 0.19 ND 0.21 ND 0.18 ND 0.21 ND 0.22 ND 1,1,2,2-Tetrachloroethane h ND ND ND ND ND ND 0.13 ND ND ND 0.13 ND Tetrachloroethylene h ND 0.13 ND ND 0.14 ND 0.12 ND 0.12 ND J 0.12 ND 0.13 ND 0.14 ND Tetrahydrofuran h NE 0.24 ND 0.3 ND 0.22 ND 0.32 ND 0.28 ND 0.27 ND 0.31 ND 0.27 ND 0.31 ND 0.31 ND Toluene o ,2,4-Trichlorobenzene h NE ND 0.12 ND ND 0.13 ND 0.11 ND 0.11 ND 0.12 ND 0.11 ND 0.12 ND 0.12 ND 1,1,1-Trichloroethane h ND 0.16 ND 0.12 ND 0.18 ND 0.15 ND 0.15 ND 0.17 ND 0.14 ND 0.17 ND 0.13 ND 1,1,2-Trichloroethane h ND ND ND ND ND ND 0.17 ND ND ND 0.17 ND Trichloroethylene h ND J 0.16 ND 0.12 ND J 0.15 ND 0.15 ND 0.17 ND 0.15 ND 0.17 ND 0.17 ND 1,2,4-Trimethylbenzene (pseudocumene) h ND J J 0.19 ND 0.17 ND J J J J J 1,3,5-Trimethylbenzene h ND 0.18 ND 0.13 ND 0.19 ND 0.17 ND 0.16 ND 0.18 ND 0.16 ND 0.18 ND 0.19 ND 2,2,4-Trimethylpentane (isooctane) (NA) h 750 NA NA NA NA NA NA NA NA NA NA Vinyl chloride h ND 0.34 ND 0.25 ND 0.37 ND 0.32 ND 0.32 ND 0.35 ND 0.31 ND 0.35 ND 0.36 ND Vinyl Bromide (bromoethene) (NA) h NE NA NA NA NA NA NA NA NA NA NA Vinyl acetate h NE J 2.5 ND J 2.7 ND 2.3 ND J 2.6 ND 2.2 ND 2.6 ND 2.6 ND m&p-xylene o J J J J J J J J J o-xylene o J J J J J J J J J J Acetonitrite h NE J J J J J J J J Acrolein h J J J J J J J J J 0.17 ND J Acrylonitrile h NE J 0.41 ND 0.3 ND 0.44 ND 0.38 ND 0.37 ND 0.42 ND J 0.42 ND 0.43 ND Alpha-pinene o J ND 0.15 ND 0.15 ND J 0.14 ND J 0.17 ND d-limonene h NE ND ND 0.15 ND 0.15 ND 0.16 ND 0.14 ND J 0.17 ND n-butyl Acetate o ND J 0.19 ND J 0.2 ND 0.17 ND 0.17 ND 0.19 ND J J 0.19 ND n-octane h J n-nonane h J J J J J n-propylbenzene h ND 0.18 ND 0.13 ND 0.19 ND 0.17 ND 0.16 ND 0.18 ND 0.16 ND 0.18 ND 0.19 ND 1,2-Dibromo-3-chloropropane h NE ND ND ND ND 0.08 ND ND 0.13 ND ND ND ND AA-8 (DUP) AA of 1

18 Notes ND = Not detected at or above the listed PQL (Practical Quantitation Limit). * Compound was detected in the blank sample analyzed at the laboratory. ** Utilizes Odor-based value as surrogate since no health criteria NE = Not Established h = health based o = odor based ST ESL = Short Term Effects Screening Level (2010) AMCV = Short Term Air Monitoring Comparison Value (2011) NA = Not Analyzed J = Compound was detected above the detection limit, but below the reporting limit, therefore the concentration reported is considered approximate D = Sample result was based on analysis after additional sample dilution Notes Page 1

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23 Notes ND = Not detected at or above the listed PQL (Practical Quantitation Limit). * Compound was detected in the blank sample analyzed at the laboratory. ** Utilizes Odor-based value as surrogate since no health criteria NE = Not Established h = health based o = odor based ST ESL = Short Term Effects Screening Level (2010) AMCV = Short Term Air Monitoring Comparison Value (2011) NA = Not Analyzed J = Compound was detected above the detection limit, but below the reporting limit, therefore the concentration reported is considered approximate D = Sample result was based on analysis after additional sample dilution Notes Page 1

24 Table 2 - Ambient Air Results - Sulfides (RSCs) January - May 2011 Sample Name: Sample Initiation Date: Sample Interval: AA-1CS AA-1CS AA-1CS AA-5CS Chemical of Concern CAS # ST ESL AMCVs MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv Hydrogen Sulfide NE NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Carbonyl Sulfide h NE 5.0 ND 5.0 ND ND 5.0 ND ND 5.0 ND 5.0 ND 5.0 ND Methyl Mercaptan o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Ethyl Mercaptan o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Dimethyl Sulfide o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Carbon Disulfide h NE 2.5 ND 2.5 ND ND 2.5 ND ND 2.5 ND 2.5 ND 2.5 ND Isopropyl Mercaptan h NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND tert-butyl Mercaptan o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND n-propyl Mercaptan o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Ethyl Methyl Sulfide h NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Thiophene o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Isobutyl Mercaptan NE NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Diethyl Sulfide o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND n-butyl Mercaptan o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Dimethyl Disulfide h NE 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 3-Methylthiophene h NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Tetrahydrothiophene o NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 2,5-Dimethylthiophene h NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 2-Ethylthiophene h NE 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND 5.0 ND Diethyl Disulfide o NE 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND 2.5 ND AA-5CS AA-5CS AA-7CS AA-7CS AA-13CS AA-13CS AA-13CS Table 3 - Ambient Air Results - Carbonyls January - May 2011 Sample Name: Sample Initiation Date: Sample Interval: Chemical of Concern CAS # ST ESL AMCVs MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result MRL Result ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv ppbv Formaldehyde h ND Acetaldehyde o ND ND 0.31 ND ND ND Propionaldehyde o ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND Crotonaldehyde, Total h ND 0.19 ND 0.19 ND 0.19 ND 0.19 ND 0.19 ND 0.19 ND 0.19 ND 0.19 ND 0.19 ND 0.19 ND Butyraldehyde o M 0.19 ND 0.19 ND M 0.19 ND 0.19 ND M 0.19 ND M 0.19 ND 0.19 ND Benzaldehyde o ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND 0.13 ND Isovaleraldehyde h ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND Valeraldehyde o ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND 0.16 ND o-tolualdehyde h ND 0.11 ND 0.11 ND 0.11 ND 0.11 ND 0.11 ND 0.11 ND 0.11 ND 0.11 ND 0.11 ND 0.11 ND m,p-tolualdehyde h ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND 0.23 ND n-hexaldehyde/hexanal o ND 0.14 ND 0.14 ND 0.14 ND 0.14 ND 0.14 ND 0.14 ND 0.14 ND 0.14 ND 0.14 ND 0.14 ND 2,5-Dimethylbenzaldehyde h ND 0.10 ND 0.10 ND 0.10 ND 0.10 ND 0.10 ND 0.10 ND 0.10 ND 0.10 ND 0.10 ND 0.10 ND ND = Not detected at or above the listed MRL (Method Reporting Limit). * Utilizes Odor-based value as surrogate since no health criteria ST ESL = Short Term Effects Screening Level (2010) NE = Not Established h = health based o = odor based NA = Not Analyzed AMCV = Short Term Air Monitoring Comparison Value (2010) AA-1CS AA-1CS AA-1CS AA-5CS AA-5CS AA-5CS AA-7CS AA-7CS AA-13CS AA-13CS AA-13CS of 1

25 FIGURES

26 "/ "/ "/ "/!. AA-1 "/ "/ "/ "/"/ "/ "/ "/ "/ "/ "/ "/!.#0 AA-4!. "/ AA-2 "/ "/ Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers 0 2,500 5,000 Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. AA-3 PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: SLM_West_Aug2011.mxd "/ "/ SAMPLING LOCATION MAP WESTERN AREA 2011 Monthly Air Quality Monitoring Flower Mound, Texas Legend #0 TCEQ Monitoring Station!. Sampling Points "/ Oil & Gas Activity Surrounding Area FIGURE 1

27 "/ AA-7!. "/ "/ AA-5!. "/ "/ AA-6!. "/ "/ Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers 0 2,500 5,000 Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. AA-13 "/ "/!. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: SLM_East_Aug11.mxd AA-8!. SAMPLING LOCATION MAP EASTERN AREA 2011 Monthly Air Quality Monitoring Flower Mound, Texas Legend!. Sampling Points "/ Oil & Gas Activity Surrounding Area FIGURE 2

28 "/!. AA-1 Legend!. Sampling Points "/ Oil & Gas Activity Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA1_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 3

29 !. "/ AA-2 Legend!. Sampling Points "/ Oil & Gas Activity Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA2_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 4

30 !. AA-3 Legend!. Sampling Points "/ Oil & Gas Activity Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA3_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 5

31 #0!. AA-4 Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Legend!. Sampling Points "/ Oil & Gas Activity #0 TCEQ Monitoring Station (CAMS 1007) Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA4_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 6

32 !. AA-5 "/ "/ "/ Legend!. Sampling Points "/ Oil & Gas Activity Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA5_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 7

33 "/!. AA-6 Legend!. Sampling Points "/ Oil & Gas Activity Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA6_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 8

34 !. AA-7 Legend!. Sampling Points "/ Oil & Gas Activity Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA7_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 9

35 !. AA-8 Legend!. Sampling Points "/ Oil & Gas Activity Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA8_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 10

36 "/ Gas Well Site "/!. AA-13 Legend!. Sampling Points "/ Oil & Gas Activity Imagery Source: (c) 2010 Microsoft Corporation and its data suppliers Feet The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information. PROJECT NO DRAWN: 09/12/11 DRAWN BY: RA CHECKED BY: PH FILE NAME: AA13_Aug2011.mxd SAMPLING LOCATION DETAIL SAMPLE AA Monthly Air Quality Monitoring Flower Mound, Texas FIGURE 11

37 APPENDIX Laboratory Data Sheets and Chain of Custody Documentation