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2018.05.08_Vendor_Inspection MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS DATE May 7, 2018 PROJECT 17153 ReportPadsite Inspection ATTN City of Denton Padsite No. 033 (Smith-Yorlum 1H) 215 East McKinney Street Operator: EagleRidge Denton,Texas 76201 Location: ® City of Denton ❑ Denton ETJ Priority: ❑ High ® Moderate ❑ Low Modern Geosciences, LLC (Modern) is pleased to provide the attached Padsite Inspection Report documenting the results of our recent inspection and monitoring events at the above-referenced padsite. A general summary of findings is presented below with detailed results provided in the attached report. ■ Field Inspection Results: As part of the field inspection efforts, Modern evaluated the padsite concerning general ordinance and/or operational requirements set forth by the City. No operational or ordinance compliance issues were noted by Modern during our inspection efforts other than noted below: • Bare pipe/corrosion noted on Separator A piping. According to operator representatives, all equipment was painted as of April 25, 2018, thus the piping observations are no longer considered Action Items. Future verification suggested. ■ Near-Equipment Inspection Results: Our inspection efforts at this padsite included near- equipment monitoring using optical gas imaging (OGI) to identify leaks of methane and/or volatile organic compounds (VOCs) and radiation meters to identify equipment exhibiting naturally-occurring radioactive material (NORM) above applicable regulatory criteria. The accumulation of scale within equipment can cause elevated NORM levels requiring proper signage and equipment management. A summary of near-equipment findings is presented below with further detail in the attached report. EquipmentNear . Equipment Number Leaks* Unlabeled NORM** Labeled NORM** Wells 1 0 0 0 Separators 2 1 0 0 ASTs 2 2 0 0 Other 1 4 1 3 101 0 *OGI leaks identified exclude operational low bleed components(<_6 scf/hr) **NORM exceeding 50 µR/hr All near-equipment inspection concerns (e.g., leaks) were communicated to the operators with a two-week period to address each. If the concerns were not addressed, these are included in the Action Items listed below. If items were addressed, this will be documented in the report. 5100 THOMPSON TERRACE,COLLEYVILLE TEXAS 76034 1 F 682.223.1593 1 P 682.223.1322 www.MODERNGEOSCIENCES.com MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS ■ Fenceline Inspection Results: Our inspection efforts for this padsite included an evaluation of air quality at representative upwind and downwind points at the padsite boundary. Our approach utilized a variety of equipment to screen for potential impacts that could affect air quality off of the padsite or suggest additional monitoring may be warranted. Please refer to the report for additional detail on our findings. Fenceline inspection did not identify air quality concerns above program screening goals; however, Modern noted elevated tVOCs and methane during downwind fenceline screening, likely related to two (2) open pipes noted with leaks on Ancillary B piping. Since fenceline monitoring confirmed a tVOC level in excess of 100 ppbv, discrete air samples were collected consistent with EPA Method TO-17. This included one (1) upwind (UW-1) and two (2) downwind (DW-1 and DW-2) air samples that were analyzed for VOCs using a gas chromatograph/mass spectrometer (GC/MS) to allow identification and quantification of individual chemicals of concern. None of the observed compounds identified in the upwind and downwind samples exceeded the applicable Air Monitoring Comparison Values (AMCVST) or Effects Screening Levels (ESLST) criteria. Future verification is suggested to confirm leaks have been addressed and elevated VOCs and methane are no longer identified at the fenceline. Please refer to the report for additional detail. ■ Action Items: If items are identified during our inspection that remain unresolved or require future confirmation, these will be listed as individual action items for the operator until the City has confirmed further action is not required. There are no outstanding Action Items as of the date of this report. ■ Next Inspection Event: The City of Denton completes periodic inspections at all padsites throughout the year. In addition to this, the City has asked Modern to perform supplemental inspections with high-resolution equipment based on proximity to sensitive property uses. Based on the current prioritization, this padsite is scheduled to be inspected again by Modern in the first half of 2019. 5100 THOMPSON TERRACE,COLLEYVILLE TEXAS 76034 1 F 682.223.1593 I P 682.223.1322 www.MODERNGEOSCIENCES.com MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS CLOSING We appreciate the opportunity to provide our services to you. Should you require additional information or have any questions regarding this report, please contact the undersigned at 682.223.1322. Respect Ily submitte , nneth .Tramm, PhD, G, CHMM Senior Program Manager MODERN GEOSCIENCES Texas Registered Geoscience Firm 50411 Texas Registered Engineering Firm F-16201 5100 THOMPSON TERRACE,COLLEYVILLE TEXAS 76034 I F 682.223.1593 I P 682.223.1322 www.MODERNGEOSCIENCES.com <S MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS DATE May 7, 2018 PROJECT 17153 PADSITE INSPECTION REPORT Padsite No. 033—Smith-Yorlum 1H PREPARED FOR City of Denton 215 East McKinney Street Denton,Texas 76201 PREPARED BY REVIEWED BY Zachar ondr , GIT e eth S.kramm, PhD, PG,'', HMM PROJECT SCIENTIST SENIOR PROGRAM MANAGER 5100 THOMPSON TERRACE,COLLEYVILLE TEXAS 76034 1 F 682.223.1593 1 P 682.223.1322 ©2018 MODERN GEOSCIENCES.ALL RIGHTS RESERVED. www.MODERNGEOSCIENCES.com PADSITE INSPECTION REPORT Padsite Name:Smith-Yorlum 1H(#033) Operator: EagleRidge Inspection Date:03112118 Inspectors:ZT, KT MODERN G E O S C I E N C E S TRUSTED ENVIRONMENTAL ADVISORS FIELD INSPECTION RESULTS: Pass Fail N/A General Inspection Checklist Items Item 1: Appropriate signage present at padsite entrance including operator name, ❑ ❑ ❑ site address, well names, 24 hr phone number, and no smoking. Comments: None Item 2: Appropriate signage present at padsite entrance and/or equipment including ® ❑ ❑ RRC/API numbers. Comments: None ❑ ❑ ❑ Item 3: Fencing present surrounding padsite and/or equipment. Comments: None ❑ ❑ ❑ Item 4: Site secured. Gates locked to control unauthorized access. Comments: None ❑ ❑ ❑ Item 5: Surface topography prevents areas with significant water collection. Comments: None ❑ ❑ ❑ Item 6: Surface free of stains or other signs of significant spills/releases. Comments: None ❑ ❑ ❑ Item 7: Padsite free of trash/waste debris. Comments: None ❑ ❑ ® Item 8: Lighting not directed toward adjacent property/roads (as applicable). Comments: None Item 9: All equipment painted with no bare pipe present. ® ❑ ❑ Comments: Bare pipe/corrosion noted (detailed in near-equipment summary). According to operator representatives, all equipment was painted as of April 25, 2018. ❑ ❑ ❑ Item 10: Landscaping appears well maintained (as applicable). Comments: None ❑ ❑ ❑ Item 11: Lightning arrestors present at ASTs and in good condition (as applicable). Comments: None ❑ ❑ ® Item 12: Pipeline markers present at roads (as applicable). Comments: None Item 13: Tank battery and secondary containment appear to have integrity with no ® ❑ ❑ significant corrosion. Comments: None ® ❑ ❑ Item 14: Remote compressed air foam line (fire suppression) present. Comments: None ❑ ❑ ❑ Item 15:Access road accommodates 20' wide emergency vehicle requirements. Comments: None Item 16: Water/oil transfer points within secondary containment or have drip control ❑ ❑ ❑ accessory to minimize spillage during waste transfer. Comments: None ® ❑ ❑ Item 17:Tank battery has appropriate hazardous material signage. Comments: None ❑ ❑ ❑ Item 18: Ponded water(Pit) has fencing and access controls. Comments: Not applicable—ponded water not present. ® ❑ ❑ Item 19: Other Audio, Visual, or Olfactory concerns noted during the inspection. Comments: None PROJECT 17153 1 MAY 7,2018 1 PAGE 1 www.MODERNGEOSCIENCES.com PADSITE INSPECTION REPORT Padsite Name:Smith-Yorlum 1H(#033) Operator:EagleRidge Inspection Date:03112118 Inspectors:ZT, KT MODERN G E O S C I E N C E S TRUSTED ENVIRONMENTAL ADVISORS • NORM At Equipment: 10,000 ppmv 1 50 µR/hr 2 Equipment: OGI Camera Radiation Meter Resolution: 3,000-10,000 ppmv 1 µR/hr FENCELINE INSPECTION CRITERIA: •nstituent: Methane tVCCs H2S NORM Fenceline: 500 ppmv 3 0.1 ppmv' 0.08 ppmv 5 20 µR/hr 6 Equipment: DPIR Meter PID HzS Meter Radiation Meter Resolution: 1 ppmv 0.001 ppmv 0.003 ppmv 1 µR/hr Notes: 1-Utilizes the Interstate Natural Gas Association of America (INGAA) recommended leak definition within their December 4,2015 response to EPA Docket No. EPA-HQ-OAR-2010-0505 — "Oil and Natural Gas Sector: Emission Standards for New and Modified Sources," dated September 18, 2015 (80 FIR 56593). Also represents 20%of the Lower Explosive Limit. A lower leak definition and additional inspection and reporting may be required at facilities subject to 40 CFR §60 Subpart OOOOa. Documented continuous low-bleed components (<6 scf/hr) and intermittent emissions from properly functioning pneumatic devices are not considered leaks for the purposes of this inspection. 2-The Texas Railroad Commission (RRC) regulates NORM under 16 TAC §4 (Environmental Protection, Subchapter F, Oil and Gas NORM). Subchapter F establishes the requirements for oil and gas NORM waste disposal for the purpose of protecting public health and the environment. NORM-contaminated equipment is defined in Subchapter F as "equipment that, at any accessible point, exhibits a minimum radiation exposure level greater than 50 µR/hr including background radiation level." When identified, the equipment suspected of being NORM-containing will be communicated to the City and operator(s) to allow further inspection and where appropriate compliance with RRC signage and management requirements. 3-Represent half of the American Conference of Governmental Industrial Hygienists (ACGIH) 8-hour threshold limit value (TLV) of 1,000 ppmv(0.1%by volume)set for potential cardiac sensitization and central nervous system depression. 4-Consistent fenceline concentrations of 0.1 ppmv could indicate a potential off-site air quality exceedance of applicable TCEQ Air Monitoring Comparison Values (AMCVs) or Effect Screening Levels (ESLs). Further sampling will be needed to confirm the individual compounds present and direct regulatory comparison. 5-Indicative of possible 30 TAC§112.31(30-min avg.)exceedance of 0.08 ppmv. Further sampling will be needed to confirm the 30-minute average and allow direct regulatory comparison. 6-EPA average background criteria established under Document No.402-R-08-005;April 2008. Reported background ranged from 10 µR/hr to 85 µR/hr. Elevated fenceline observations may require further screening to confirm attenuated levels near sensitive receptors. PROJECT 17153 1 MAY 7,2018 1 PAGE 2 www.MODERNGEOSCIENCES.com PADSITE INSPECTION REPORT Padsite Name:Smith-Yorlum 1H(#033) Operator: EagleRidge Inspection Date:03112118 Inspectors:ZT, KT MODERN G E O S C I E N C E S TRUSTED ENVIRONMENTAL ADVISORS NEAR EQUIPMENT INSPECTION RESULTS: 4SPECTION RESULTS - WELL Location ID: Leaks (OGI): NORM (ltR/hr; max): Date Reported': Date Addressed Well A None <15 NA NA General Notes: No other concerns noted. 1—Reported to operator,•2—If reported to Modern by operator/City; *NORM exceeding 50 µR/hr not labeled INSPECTION RESULTS — SEPARATORS Location ID: Leaks (OGI): NORM (l-LR/hr; max): Date Reported': Date Addressed: Separator Actuator <15 03/12/18 03/12/18 Separator B None <15 NA NA General Notes: Bare pipe/corrosion noted on Separator A piping. According to operator representatives, all equipment was painted as of April 25, 2018. Future verification suggested. No other concerns noted. 1—Reported to operator,•2—If reported to Modern by operator/City; *NORM exceeding 50 µR/hr not labeled IAICD=r'TIr1AI QGCI n Tc —TAnIK BATTERY AcTc% Location ID: Leaks(IOG • ' �. - -•• -• �. - � •• - -• AST A None <15 NA NA AST B Thief Hatch and <15 03/12/18 04/25/18 Enardo Valve General Notes: No other concerns noted. 1-Reported to operator,•z—If reported to Modern by operator/City; *NORM exceeding 50 µR/hr not labeled INSPECTION RESU—TS— COMPRESSORS OR ANCILLARY EQUIPMENT Location ID: Leaks (OGI): NORM (�tR/hr; max): 1 Date Reported': I Date Addressed: Compressor A Kimray PDC <15 03/12/18 04/25/18 Ancillary A None <15 NA NA Ancillary B Two (2) Open Pipes <15 03/12/18 04/25/18 Ancillary C None <15 NA NA General Notes: Minor corrosion noted on Ancillary B. No other concerns noted. 1—Reported to operator,•z—If reported to Modern by operator/City; *NORM exceeding 50 µR/hr not labeled PROJECT 17153 1 MAY 7,2018 1 PAGE 3 www.MODERNGEOSCIENCES.com PADSITE INSPECTION REPORT Padsite Name:Smith-Yorlum 1H(#033) Operator:EagleRidge Inspection Date:03112118 Inspectors:ZT, KT MODERN G E O S C I E N C E S TRUSTED ENVIRONMENTAL ADVISORS FENCELINE INSPECTION RESULTS: - -. . .• Avg. Wind Direction (to): SW Avg. Wind Speed (mph):4.5 Bar. Pressure ("Hg): 29.70 • Avg.Temp (OF): 50.5 Humidity(%): 50.3 Precipitation: N/A Fenceline Screening Criteria: Yes No N/A Upwind •. Downwind Observations: 1 PID > 100 ppbv (0.1 ppmv)? ® ❑ ❑ <1 ppbv 3,500 ppbv* 1 Radiation >20 µR/hr? ❑ ® ❑ <15 µR/hr <15 µR/hr 1 HzS>80 ppbv(0.08 ppmv)? ❑ ® ❑ <5 ppbv <5 ppbv 1 Methane>500 ppmv? ❑ ❑ ❑ <5 ppmv 250 ppmv *VOC impact was not continuous due to wind conditions. Gusting noted to the SE. Other perimeter/fenceline observations suggestive of releases or concerns: None Comments: Based on the identification of elevated tVOCs (>100 ppbv) and methane during downwind fenceline screening, Modern used conditioned thermal desorption tubes to collect one (1) upwind (UW-1) and two (2) downwind (DW-1 and DW-2) air samples. A calibrated pump was connected to the tube to allow collection of a representative sample.The air was sampled at a rate of 100 ml/min for approximately 10 minutes. The sampling tube was affixed to a discrete sample point to allow collection of air from approximately five feet six inches (5.5') above ground (breathing zone). The sampling systems (e.g., pumps, tubing, attachments) were evaluated before and after each sampling event to ensure sample integrity was maintained. Upon completion of the sampling event, the tubes were placed in a sealed inert container and placed on ice and sampling information (e.g., tube serial number, sample ID, time, flow rate) was recorded on the chain of custody. The sampling and monitoring efforts were performed in accordance with applicable elements of EPA Method TO-17. Following sample collection, the thermal desorption tubes were analyzed by Modern using a gas chromatograph/mass spectrometer (GC/MS) to allow identification and quantification of individual chemicals of concern. All analyses were performed in accordance with Modern's internal Quality Assurance Project Plan (QAPP) governing sample analysis procedure. None of the observed compounds identified in the upwind and downwind samples exceeded the applicable Air Monitoring Comparison Values (AMCVST) or Effects Screening Levels (ESLST) criteria. Following analysis, Modern reviewed the resulting chromatograms for indication of Tentatively Identified Compounds (TICS). No compounds were identified during the TIC evaluation for UW-1.The TIC evaluation for DW-1 and DW-2 suggested low levels of multiple compounds. An overlay of the upwind and downwind samples is provided as an attachment.Additionally,Table 1 provides a summary of our VOC sampling results. Notes: 1- Represents the maximum discrete sampling result recorded by Modern across fenceline screening alignment. General Inspection Program Notes: 1- Modern confirmed operation of all field equipment in accordance with manufacture specifications and Modern's standard operating procedures prior to field inspection efforts. This included the use of zero and prepared calibration samples. 2- Modern's services were performed in a manner consistent with a level of care and skill ordinarily exercised by other members of our profession practicing in the same locality, under similar conditions and at the time the services were performed. The scope of services performed was in accordance with the scope of work agreed with by our client, as set forth in our proposal and related authorization agreement(s). 3- Laws, regulations and professional standards applicable to Modern'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 Modern by our Client. Modern does not warrant the work of third parties supplying information used in the report. 4- The monitoring results collected as part of these services represent field conditions at the time of inspection or monitoring only. Samples or monitoring data collected at other times may reveal different results that are representative of site conditions during other periods of time. The use of monitoring efforts is not intended to replace laboratory methodology, but rather provide data indicative of when additional efforts may be warranted. Modern's air sampling is consistent with current regulatory guidance and/or manufacturer specification. For a higher level of certainty, our monitoring methods can be expanded over longer periods of time and/or supplemented by use of a state-accredited laboratory when evaluation of specific COCs is desired or further verification is needed. PROJECT 17153 1 MAY 7,2018 1 PAGE 4 www.MODERNGEOSCIENCES.com v MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS TABLES PROJECT 17153 www.MODERNGEOSCIENCES.com Table 1:Padsite Air Monitoring Name UW-1 DW-1 DW-2 Padsite No.033 Date 3/12/2018 3/12/2018 3/12/2018 Denton,Texas Time 1147 1147 1159 Type TD TD TD Wind(to) SW SW SW Position Upwind Downwind Downwind Trichloromonofluoromethane 75-69-4 10000 H 10000 H 1 0.70 0.70 3.92 BDL BDL BDL BDL Benzene 71-43-2 180 H 53 H 1 0.96 0.41 1.32 0.62 1.98 0.96 3.06 Toluene 108-88-3 4000 H 1200 H 1 1.26 0.09 0.34 0.63 2.36 1.26 4.76 Chlorobenzene 108-90-7 100 H 100 H 1 0.02 BDL BDL BDL BDL 0.02 0.10 m-Xylene 106-42-3 NE 510 H 1 0.74 0.06 0.26 0.48 2.09 0.74 3.22 Styrene 100-42-5 26 0 26 O 1 2.40 0.03 0.12 0.02 0.06 2.40 10.24 Isopropylbenzene 1 0.00 BDL BDL BDL BDL BDL BDL n-propylbenzene 103-65-1 510 H 510 H 1 0.03 BDL BDL BDL BDL 0.03 0.15 1,3,5-trimethylbenzene 108-67-8 3000 H 890 H 1 0.07 0.07 0.36 0.02 0.09 0.03 0.12 tert-butylbenzene 98-06-6 NE 446.48 H 1 0.01 0.00 0.03 0.01 0.03 0.00 0.02 trans-1,2-dichloroethene 156-60-5 NE 2000 H 1 0.00 BDL BDL BDL BDL BDL BDL Methylene chloride 75-09-2 3400 H 1000 H 1 0.85 BDL BDL BDL BDL 0.85 2.94 1,1-dichloroethene 75-35-4 180 H 53 H 1 0.00 BDL BDL BDL BDL BDL BDL 1,1-dichloroethane 75-34-3 1000 H 1000 H 1 0.00 BDL BDL BDL BDL BDL BDL 1,1,1-trichloroethane 71-55-6 1700 H 510 H 1 0.00 BDL BDL BDL BDL BDL BDL Carbon tetrachloride 56-23-5 20 H 20 H 1 0.16 0.16 1.02 BDL BDL BDL BDL Trichloroethylene 79-01-6 100 H 100 H 1 0.00 BDL BDL BDL BDL BDL BDL cis-1,3-dichloropropene 10061-01-5 9.9 H 9.9 H 1 0.00 BDL BDL BDL BDL BDL BDL trans-1,3-dichloropropene 10061-02-6 9.9 H 9.9 H 1 0.00 BDL BDL BDL BDL BDL BDL 4-chlorotoluene 106-43-4 NE NE 1 0.00 BDL BDL BDL BDL BDL BDL 1,2-dichlorobenzene 95-50-1 NE 150 H 1 0.00 BDL BDL BDL BDL BDL BDL 1,4-dichlorobenzene 106-46-7 NE 150 H 1 0.00 BDL BDL BDL BDL BDL BDL 4-isopropyltoluene 99-87-6 NE 500 H 1 0.00 BDL BDL BDL BDL BDL BDL Naphthalene .20 0.15 0.79 BDL BDL 0.20 1.07 1,2,3-trichlorobenzene 87-61-6 NE NE' 1 0.00 BDL BDL BDL BDL BDL BDL Hexachlorobutadiene 87-68-3 NE 0.2 H 1 0.00 BDL BDL BDL BDL BDL BDL Carbon disulfide 75-15-0 NE 2400 H 1 0.16 BDL BDL BDL BDL 0.16 0.49 Propionitrile 107-12-0 NE 60 H 1 0.00 BDL BDL BDL BDL BDL BDL Methyl tert butyl ether 0 1 0.83 BDL BDL BDL BDL 0.83 2.98 Methacrylonitrile 126-98-7 NE 10 H 1 0.00 BDL BDL BDL BDL BDL BDL 1-chlorobutane 109-69-3 NE 713.43 H 1 2.26 0.09 0.35 2.26 8.55 2.06 7.80 trans-1,4-dichloro-2-butene 110-57-6 NE NE 1 0.00 BDL BDL BDL BDL BDL BDL Hexachloroethane 67-72-1 NE NE' 1 0.00 BDL BDL BDL BDL BDL BDL cis-1,2-dichloroethene 156-59-2 NE 2000 H 1 0.00 BDL BDL BDL BDL BDL BDL Methane,bromochloro- 74-97-5 NE 2000 H 1 0.00 BDL BDL BDL BDL BDL BDL 1-Propene,1,1-dichloro- 563-58-6 NE 9.9 H 1 0.00 BDL BDL BDL BDL BDL BDL Methane,dibromo- 74-95-3 NE 185.74 H 1 0.00 BDL BDL BDL BDL BDL BDL Propane,1,2-dichloro- 78-87-5 100 H 100 H 1 0.00 BDL BDL BDL BDL BDL BDL Ethane,1,1,2-trichloro- 79-00-5 100 H 100 H 1 0.00 BDL BDL BDL BDL BDL BDL Methane,dibromochloro- 124-48-1 NE 2.35 H 1 0.00 BDL BDL BDL BDL BDL BDL Ethane,1,2-dibromo- 106-93-4 0.5 H 0.5 H 1 0.00 BDL BDL BDL BDL BDL BDL Tetrachloroethylene 127-18-4 1000 H 290 H 1 1.69 0.06 0.39 BDL BDL 1.69 11.45 Ethane,1,1,1,2-tetrachloro- 79-34-5 10 H 10 H 1 0.00 BDL BDL BDL BDL BDL BDL Ethylbenzene 100-41-4 20000 H 6000 H 1 0.18 0.04 0.17 0.04 0.17 0.18 0.80 p-Xylene 106-42-3 NE 510 H 1 0.50 0.04 0.18 0.33 1.42 0.50 2.18 o-Xylene 95-47-6 1700 H 510 H 1 0.09 BDL BDL 0.06 0.27 0.09 0.41 Propane,1,2,3-trichloro- 96-18-4 NE 100 H 1 0.00 BDL BDL BDL BDL BDL BDL Benzene,bromo- 108-86-1 NE 4.67 H 1 0.00 BDL BDL BDL BDL BDL BDL 2-chlorotoluene 95-49-8 NE 44 0 1 0.04 BDL BDL BDL BDL 0.04 0.19 Benzene,1,2,4-trimethyl- 95-63-6 3000 H 890 H 1 0.12 0.01 0.07 0.01 0.07 0.12 0.57 Benzene,1,3-dichloro- 541-73-1 NE 150 H 1 0.00 BDL BDL BDL BDL BDL BDL sec-butylbenzene 135-98-8 NE NE 1 0.01 0.01 0.04 0.01 0.05 0.01 0.06 Benzene,butyl- 104-51-8 NE 500 H 1 0.04 BDL BDL BDL BDL 0.04 0.23 Benzene,1,2,4-trichloro- 120-82-1 NE 50 H 1 0.00 BDL BDL BDL BDL BDL BDL Field Monitoring Data Units Screening Total VOCs(tVOCs) pp 100 • 0.001 3500 ND 2000 3500 Methane(CH4) ppmv 500 1 250 ND 100 250 Wind Speed mph NA NA 4.5 4.5 Temperature °F NA NA 50.5 50.5 Humidity % NA NA 50.3 50.3 Barometric Pressure in Hg NA NA 29.7 29.7 All AMCVs and ESLs presented in ppb MAX presented in ppb SDL=Estimated Sample Detection Limit BDL=Below Detection Limit Highest observed values during monitoring noted for tVOCs and CH4 ND=Below equipment detection limits NA=Not Applicable Any value noted that is below the SDL represents an estimated concentration AMCV and ESL values are short-term criteria,TCEQ November 2016 1-Must meet NAAQS v MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS CHROMATOGRAMS PROJECT 17153 www.MODERNGEOSCIENCES.com V MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS TIC_Max=17,556,024:TIGrIC_Mex=1%:TIC=330,779:Scan Set*1:Scan# 1362:RT=18:06.8 100 T:= — Internal Standard#2 Heptane, 2,4-dimethyl- Tetrachloroethene p-Xylene Internal Standard#1 Octane,4-methyl- Hexane, 2-methyl- Hexane,3-methyl- Styrene Heptane Nonane 40 1,3,4,7-Tetroxa ne Cyclohexane, methyl Cyclotetrasiloxane Toluene D-Limonene 20 +I j I o - 02:00 01:00 1 09:0o 08:00 10:00 12:00 14:00 16:00 18:00 Fig. R1: Chromatogram Overlay—TIC Evaluation The above overlay provides a summary of data from UW-1 (blue), DW-1 (green), and DW-2 (red), including TIC evaluation. Please see the attached figures for sampling locations. PROJECT 17153 www.MODERNGEOSCIENCES.com v MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS PHOTOGRAPHIC DOCUMENTATION PROJECT 17153 www.MODERNGEOSCIENCES.com PHOTOGRAPHIC DOCUMENTATION MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS r 922"11 } No. 1 Leak observed at an actuator on No. 2 Leak observed at an actuator on Separator A. Separator A in High Sensitivity Mode. Ile fool No. 3 Leaks observed at a thief hatch and No.4 Leaks observed at a thief hatch and enardo valve on AST B. enardo valve on AST B in High Sensitivity Mode. I � AM - _� !� `-/,,=: � 5 '�"y �G ►•,. it I No. 5 Leak observed at a kimray PDC on No. 6 Leak observed at a kimray PDC on Compressor A. Compressor A in High Sensitivity Mode. PROJECT 17153 www.MODERNGEOSCIENCES.com PHOTOGRAPHIC DOCUMENTATION MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS cir �a7. �� s r., w•, ,�• ..�.�'c• rtYr.��.� _�.=•..=art .���. _ No. 7 Leak observed at an open pipe on No.8 Leak observed at an open pipe on Ancillary B. Ancillary B in High Sensitivity Mode. No. 9 Leak observed at another open pipe No. 10 Leak observed at another open pipe on on Ancillary B. Ancillary B in High Sensitivity Mode. X f EACLERlOCE/PERATR1.lLC �`EAREROCEOPEIGTRG.LLC EACIERIOiEOPERAIN,UCN j— arTh-raaurwrrr a�n-rowurr.a rrx-raru°arr rrx 0.P1.42-121-flSHRICl194132 APIA2-IIl-]U11RRC/10T242 API142-IZI-319301PAC/19T2A/ - - 11)lOL0001MpNCERTRITI 175700011111111111111111 ONTI 113TR0001/ROADorm11 ] 1 n aALe, DANGER RALRi DANGER W191 DANGER L L NO SMOING ALLOWED NO SMOKING ALLOWED NO SMOKING AVOWED �d1IGr��.34..a1 ,'.At�:;� .ia�ti,t r;A�' ,. �" sk4.vS�f -i'� ,. '•' �� No. 11 View of padsite entrance signage. No. 12 Additional view of padsite entrance signage. PROJECT 17153 www.MODERNGEOSCIENCES.com PHOTOGRAPHIC DOCUMENTATION MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS 1--X ' M: No. 13 View of Well A. No. 14 View of Separator A and corroded piping. i No. 15 View of ASTs. No. 16 View of Ancillary B and Separator B. ie,&I No. 17 View of Ancillary C. No. 18 View of Compressor A. PROJECT 17153 www.MODERNGEOSCIENCES.com MODERN GEOSCIENCES TRUSTED ENVIRONMENTAL ADVISORS FIGURES PROJECT 17153 www.MODERNGEOSCIENCES.com Aerial Source:Microsoft Corporation©and its data suppliers Eagle Ridge Well ID RRC ID Padsite Location A 194032 SW Dentft a �y A-V l u� • ■ U W-1 Basemap Source:ESRI A Legend: - A K O Compressors Q Well B ❑ Separator A ■ O AST 1 B ■ r () Ancillary Equipment B A Air Sample Point DW-1 ■ mammal DW-2 ® Upwind Air Sampling Point do 4f6 m Downwind Air Sampling Point • ♦, � ���, ♦ Foam Lines L �Y to Wind Direction(to) u ■ ■ Fenceline Screening Alignment Observation Path Padsite I t a Denton County Parcels PROJECT NO. 17153 FIGURE 0 25 50 75 100 ® 03.28.18 PADSITE MAP Feet DRAWN: • DRAWN BY: CS/LM This figure was prepared using data from a variety of sources. No warranty is made as to the accuracy or completeness of data KT provided through third CHECKED BY: � p g parties. All data contained herein is Smith-Yorlum Unit 1 H Padsite NO.33 subject to change without notice.This figure is not intended for use as a MODERN G E O S C I E N C E S FILE NAME: 1757 Old Dominion legal survey or construction design document. If denoted, wind Denton,Texas direction represents dominant wind direction observed during field activities. TRUSTED ENVIRONMENTAL ADVISORS® 33_M_ER_SY1H_Padsite_180328.mxd