Memorandum. Introduction

Transcription

1 5670 Greenwood Plaza Blvd Suite 540 Greenwood Village, Colorado PH Memorandum Date: November 1, 2017 To: CC: From: Kelly Weidenbach, Natrona County Health Department (NCHD) Doug Tunison, Dennis Bay, Natrona County School District#1 (NCSD #1) Joe Nicholas, FDL Operating, LLC Dave Folkes, Eric Lovenduski, Geosyntec Anne Woodland and Stephen Foster, Geosyntec Subject: Summary of Quarterly Air Quality Sampling Data from October 7, 2017, Collected at the Midwest School, Midwest, Wyoming, with an Operational Mitigation System. Introduction The purpose of this memorandum is to summarize the quarterly air quality sampling results conducted on October 7, at the Midwest School, Midwest, Wyoming. The previous four, monthly rounds of air quality sampling were conducted on April 3, May 15, June 23 and July 25. The sampling frequency changed from monthly to quarterly after the July sampling event. The results were compared to action levels presented in the approved Indoor Air Monitoring Plan (IAMP), and the results for all samples were below the action levels for all analytes. Consistent with the approved IAMP and the past four, monthly sampling rounds, six indoor air and two outdoor air samples were collected on October 7, from the locations shown on Figure 1 of the IAMP. In addition, one sample was collected from Room 105, based largely on the presence of an unidentified smell in that room. The samples were collected over a period of eight hours, and are intended to represent air quality during a school day. The samples were submitted to Eurofins Air Toxics Laboratory for analysis. The quarterly sampling event was changed from the original scheduled date of October 21 to October 7, based on the presence of an unidentified smell in Room 105, and fluctuations in carbon dioxide concentrations. (Note that the October 4 memorandum summarizes the issues surrounding Room 105.) Students were moved out of that classroom on Wednesday September 20, and the classroom remains closed to students at this time. In addition, one fan on the mitigation system, fan F3 controlling suction points SP-10 and SP-11, was not working at the time of the October 7 1

2 Midwest School Project October Air Sampling Results air sampling, and replacement of the fan was anticipated. The fan was restarted the following week and continues to work at this time, and the school has a new fan as a spare. Carbon Dioxide As a separate task that arose since school resumed in August, weekly reviews of the carbon dioxide (CO2) concentrations at the school have been conducted over the last five weeks, in order to determine whether trends are identifiable. (CO2 data are not included in this memorandum.) Subsequent to the October 7 air sampling event, the audible and alarms on the CO2 monitoring system were activated. As such, a weekly review of the CO2 data is no longer necessary. Any exceedances of the 1,000 or 1,500 ppm CO2 limit that aren t resolved within an hour or two will be evaluated on a case-by-case basis. Laboratory Data Quality Review The Eurofins Air Toxics Laboratory data package of results was received on October 27, and reviewed by Geosyntec in accordance with the items specified in Section 4 of the IAMP, including criteria such as the sample holding time, and quality control items, including blank sample quality, laboratory control sample quality, and surrogate recoveries to determine sample quality. The data package review revealed that all items were acceptable and within the stated acceptance limits, as discussed below. The chain of custody (COC) was reviewed to ensure that the samples were accurately labeled, handled and tracked from the sampling location to the analyzing laboratory, and to verify that the final canister pressures were within the acceptable range for analysis. The samples were collected on October 7 and analyzed on October 18, indicating that the standard holding time of 30 days or less was met. The laboratory indicated that there was no sample identification on the canister tag for Weather Station, however they were able to obtain the sample ID from the chain of custody. The initial canister vacuum readings and final pressures were sufficient to meet the project reporting limits. The laboratory method blank is used to determine whether background contamination exists at the laboratory. The method blank was non-detect for all analytes. Surrogate compounds are added to each sample prior to analysis to evaluate overall laboratory performance and the efficiency of the analytical technique. The surrogate recoveries were within acceptable limits for all samples. The laboratory control sample and duplicate are used to assess the accuracy and precision of the analytical method, and the results must fall within a stated range. The percent recoveries on the laboratory control sample and duplicate were within the acceptable limits, and the relative percent difference between the two samples was acceptable. The field duplicate is used to assess the overall precision of the field sampling procedures and analytical method, and to assess the variability within one location. For analytes detected in both 2

3 Midwest School Project October Air Sampling Results samples, the relative percent difference between the two results is calculated and should generally be less than 50 percent. A field duplicate was collected from the library, and that sample was labeled BD The results were non-detect for the analytes in both samples. The relative percent difference is not calculated when one or more sample results are non-detect. Overall, the primary and field duplicate showed good agreement between the two samples. Results and Comparison of Data to Action Levels Table 1 summarizes the indoor and outdoor air sample results of monitoring with the operational vapor mitigation system, for all of the sampling rounds conducted to date. The indoor air data from the October sampling event are compared with the approved action levels presented in the IAMP for each chemical; summarized in Table 1. The comparison indicates that all indoor air results are below the corresponding action levels. The outdoor air sample results provide an indication of the potential impacts of outdoor air on indoor air quality. The outdoor air samples from October are non-detect for all analytes. All compounds were non-detect in October, except for the following: Concentrations of toluene were non-detect in six of the seven locations sampled. A toluene concentration of 0.94 µg/m 3 was reported in the Preschool; this result is well below the action level of 3,800 µg/m 3. Conclusion These data indicate that indoor air quality meets the action levels specified in the IAMP for all samples collected during the second quarterly sampling event in October 2017, at the Midwest school. The data collected from April through October indicate that the concentrations in the building are relatively homogenous and currently appear consistent from one month to the next. Consistent with the approved IAMP, air sampling will continue on a quarterly basis, with an approximate date of January 13, 2018 for the next sampling round. This date may shift slightly, based on scheduling availability of TriHydro. Sampling will continue in the original locations; based on the October results for Room 105, no further sampling is warranted in that location. In addition, weekly reviews of the CO2 data are no longer necessary, because the audible and alarm systems were activated. To the extent possible, contractors and employees conducting abatement and repair/refurbishing activities should provide the school district with a list of chemicals, commercial products and 3

4 Midwest School Project October Air Sampling Results activities to help minimize, or at least to understand the potential for adverse impacts on future air quality sample results due to remodeling. 4

5 Table 1. Midwest School Indoor and Outdoor Air Concentrations April to October, 2017 Location Sample Date Benzene Ethylbenzene m,p-xylene o-xylene 1,2,3- Trimethylbenzene 1,2,4- Trimethylbenzene 1,3,5- Trimethylbenzene October Results Indoor Samples (µg/m3) Library 10/7/2017 <0.66 <0.78 <0.89 <0.89 <0.89 <5.1 <1.0 <1.0 Duplicate (Library) (BD ) 10/7/2017 <0.69 <0.82 <0.94 <0.94 <0.94 <5.3 <1.1 <1.1 Room /7/2017 <0.64 <0.76 <0.87 <0.87 <0.87 <4.9 <0.99 <0.99 Pool 10/7/2017 <0.68 <0.80 <0.92 <0.92 <0.92 <5.2 <1.0 <1.0 Preschool 10/7/2017 < <0.89 <0.89 <0.89 <5.1 <1.0 <1.0 Kitchen 10/7/2017 <0.64 <0.76 <0.87 <0.87 <0.87 <4.9 <0.99 <0.99 Room /7/2017 <0.66 <0.78 <0.89 <0.89 <0.89 <5.1 <1.0 <1.0 Outdoor Samples (µg/m3) Swingset 10/7/2017 <0.69 <0.82 <0.94 <0.94 <0.94 <5.3 <1.1 <1.1 Weather Station 10/7/2017 <0.68 <0.80 <0.92 <0.92 <0.92 <5.2 <1.0 <1.0 Action Levels (µg/m3) 9.6 3, July Results Indoor Samples (µg/m3) Library 7/25/2017 < <0.9 <0.9 <0.9 <5.1 <1.0 <1.0 Duplicate (Library) (BD 7-25) 7/25/ <0.85 <0.85 <0.85 <4.8 <0.96 <0.96 Room 101 7/25/ < <0.83 <4.7 <0.94 <0.94 Pool 7/25/ < <0.89 <5.1 <1.0 <1.0 Preschool 7/25/ <0.82 <0.82 <0.82 <4.6 <0.92 <0.92 Kitchen 7/25/2017 < <0.90 <0.90 <0.90 <5.1 <1.0 <1.0 Outdoor Samples (µg/m3) Swingset 7/25/2017 < <0.87 <0.87 <0.87 <4.9 <0.98 <0.98 Weather Station 7/25/2017 <0.63 <0.74 <0.85 <0.85 <0.85 <4.8 <0.96 <0.96 Action Levels (µg/m3) 9.6 3, June Results Indoor Samples (µg/m3) Library 6/23/2017 <0.66 <0.78 <0.89 <0.89 <0.89 <5.1 <1.0 <1.0 Duplicate (Library) 6/23/2017 <0.64 <0.76 <0.87 <0.87 <0.87 <4.9 <0.99 <0.99 Room 101 6/23/2017 <0.63 <0.74 <0.85 <0.85 <0.85 <4.8 <0.96 <0.96 Pool 6/23/2017 < < <0.87 <4.9 <0.99 <0.99 Preschool 6/23/2017 <0.61 <0.72 <0.83 <0.83 <0.83 <4.7 <0.94 <0.94 Kitchen 6/23/2017 < < <0.87 <4.9 <0.99 <0.99 Outdoor Samples (µg/m3) Weather Station 6/23/2017 <0.63 <0.74 <0.85 <0.85 <0.85 <4.8 <0.96 <0.96 Swingset 6/23/2017 <0.61 <0.72 <0.83 <0.83 <0.83 <4.7 <0.94 <0.94 Action Levels (µg/m3) 9.6 3, May Results Indoor Samples (µg/m3) Library 5/15/2017 <0.69 <0.81 <0.94 <0.94 <0.94 <5.3 <1.1 <1.1 Duplicate (Library) 5/15/2017 < < <0.91 <5.2 <1.0 <1.0 Room 101 5/15/2017 < <0.92 <0.92 <0.92 <5.2 <1.0 <1.0 Pool 5/15/ <0.82 <0.95 <0.95 <0.95 <5.4 <1.1 <1.1 Preschool 5/15/2017 <0.66 <0.78 <0.90 <0.90 <0.90 <5.1 <1.0 <1.0 5

6 Table 1. Midwest School Indoor and Outdoor Air Concentrations April to October, 2017 Location Sample Date Benzene Ethylbenzene m,p-xylene o-xylene 1,2,3-1,2,4-1,3,5- Trimethylbenzene Trimethylbenzene Trimethylbenzene Kitchen 5/15/2017 < <0.91 <0.91 <0.91 <5.2 <1.0 <1.0 Outdoor Samples (µg/m3) Weather Station 5/15/2017 <0.69 <0.82 <0.94 <0.94 <0.94 <5.3 <1.1 <1.1 Swingset 5/15/2017 <0.68 <0.80 <0.92 <0.92 <0.92 <5.2 <1.0 <1.0 Action Levels (µg/m3) 9.6 3, April Results Indoor Samples (µg/m3) Library 4/3/ <0.78 <0.90 <0.90 <0.90 < <1.0 Room 101 4/3/2017 <0.61 <0.72 <0.82 <0.82 <0.82 < <0.93 Boys Locker Room 4/3/ <0.73 < <0.84 <4.7 <0.95 <0.95 Pool Crawl Space 4/3/2017 <0.69 <0.81 <0.93 <0.93 <0.93 < Preschool 4/3/ <0.75 <0.87 <0.87 <0.87 < Boiler Room 4/3/ J <0.76 < <0.87 < Outdoor Samples (µg/m3) Weather Station 4/3/2017 <0.64 <0.76 <0.87 <0.87 <0.87 <4.9 <0.99 <0.99 Swingset 4/3/ <0.75 <0.87 <0.87 <0.87 <4.9 <0.98 <0.98 Action Levels (µg/m3) 9.6 3, Notes: Detected analytes are highlighted. Action levels originate from the Indoor Air Monitoring Plan and were approved by the Natrona County Health Department. Non-detected chemicals are shown as "<" followed by the reporting limit, which is specific to each sample collected, and varies with the final canister pressure. J - an estimated value that is detected below the reporting limit Benzene value of 9.6 µg/m3 corresponds to the ATSDR Chronic MRL (ATSDR 2017) Action levels for toluene, ethylbenzene, and xylenes correspond to the ATSDR Chronic MRL (ATSDR 2017) Action levels for 1,2,3-trimethylbenzene and 1,2,4-trimethylbenzene are based on the RSLs for Industrial exposure (EPA 2016), because there are no ATSDR Chronic MRLs. Action level for 1,3,5-trimethylbenzene is based on 1,2,3-trimethylbenzene. 6

7 10/27/2017 Mr. Joe Nicholas FDL Operating, LLC North Gas Plant Rd., Country 131 PO Box 10 Midwest WY Project Name: Midwest School Project #: 44W Workorder #: Dear Mr. Joe Nicholas The following report includes the data for the above referenced project for sample(s) received on 10/10/2017 at Air Toxics Ltd. The data and associated QC analyzed by Modified TO-15 are compliant with the project requirements or laboratory criteria with the exception of the deviations noted in the attached case narrative. Thank you for choosing Eurofins Air Toxics Inc. for your air analysis needs. Eurofins Air Toxics Inc. is committed to providing accurate data of the highest quality. Please feel free to contact the Project Manager: Brian Whittaker at if you have any questions regarding the data in this report. Regards, Brian Whittaker Project Manager Page 1 of 19

8 WORK ORDER #: Work Order Summary CLIENT: PHONE: FAX: DATE RECEIVED: 10/10/2017 DATE COMPLETED: 10/21/2017 Mr. Joe Nicholas FDL Operating, LLC North Gas Plant Rd., Country 131 PO Box 10 Midwest, WY BILL TO: P.O. # PROJECT # CONTACT: Mr. Joe Nicholas FDL Operating, LLC North Gas Plant Rd., Country 131 PO Box 10 Midwest, WY W Midwest School Brian Whittaker RECEIPT FRACTION # NAME TEST VAC./PRES. FINAL PRESSURE 01A Library Modified TO "Hg 5 psi 02A BD Modified TO "Hg 5 psi 03A Room 101 Modified TO "Hg 5 psi 04A Pool Modified TO "Hg 5 psi 05A Room 105 Modified TO "Hg 5 psi 06A Preschool Modified TO "Hg 5 psi 07A Kitchen Modified TO "Hg 5 psi 08A Weather Station Modified TO "Hg 5 psi 09A Swingset Modified TO "Hg 5 psi 10A Lab Blank Modified TO-15 NA NA 11A CCV Modified TO-15 NA NA 12A LCS Modified TO-15 NA NA 12AA LCSD Modified TO-15 NA NA CERTIFIED BY: DATE: 10/21/17 Technical Director Certification numbers: AZ Licensure AZ0775, NJ NELAP - CA016, NY NELAP , TX NELAP - T , UT NELAP CA , VA NELAP , WA NELAP - C935 Name of Accreditation Body: NELAP/ORELAP (Oregon Environmental Laboratory Accreditation Program) Accreditation number: CA300005, Effective date: 10/18/2016, Expiration date: 10/17/2017. Eurofins Air Toxics Inc.. certifies that the test results contained in this report meet all requirements of the NELAC standards This report shall not be reproduced, except in full, without the written approval of Eurofins Air Toxics, Inc. 180 BLUE RAVINE ROAD, SUITE B FOLSOM, CA (916) (800) FAX (916) Page 2 of 19

9 LABORATORY NARRATIVE Modified TO-15 FDL Operating, LLC Workorder# Nine 6 Liter Summa Canister samples were received on October 10, The laboratory performed analysis via modified EPA TO-15 using GC/MS in the full scan mode. This workorder was independently validated prior to submittal using 'USEPA National Functional Guidelines' as generally applied to the analysis of volatile organic compounds in air. A rules-based, logic driven, independent validation engine was employed to assess completeness, evaluate pass/fail of relevant project quality control requirements and verification of all quantified amounts. modifications taken to run these samples are summarized in the table below. Specific project requirements may over-ride the ATL modifications. Requirement TO-15 Initial Calibration </=30% RSD with 2 compounds allowed out to < 40% RSD ATL Modifications </=30% RSD with 4 compounds allowed out to < 40% RSD Blank and standards Zero Air UHP Nitrogen provides a higher purity gas matrix than zero air Receiving Notes Sample identification for sample Weather Station was not provided on the sample tag. Therefore the information on the Chain of Custody was used to process and report the sample. Analytical Notes The reported CCV for each daily batch may be derived from more than one analytical file due to the client's request for non-standard compounds. Non-standard compounds may have different acceptance criteria than the standard TO-14A/TO-15 compound list as per contract or verbal agreement. Definition of Data Qualifying Flags Eight qualifiers may have been used on the data analysis sheets and indicates as follows: B - present in laboratory blank greater than reporting limit (background subtraction not performed). J - Estimated value. E - Exceeds instrument calibration range. S - Saturated peak. Q - Exceeds quality control limits. U - analyzed for but not detected above the reporting limit, LOD, or MDL value. See data page for project specific U-flag definition. UJ- Non-detected compound associated with low bias in the CCV N - The identification is based on presumptive evidence. File extensions may have been used on the data analysis sheets and indicates as follows: a-file was requantified Page 3 of 19

10 b-file was quantified by a second column and detector r1-file was requantified for the purpose of reissue Page 4 of 19

11 Summary of Detected s Client Sample ID: Library Lab ID#: A No Detections Were Found. Client Sample ID: BD Lab ID#: A No Detections Were Found. Client Sample ID: Room 101 Lab ID#: A No Detections Were Found. Client Sample ID: Pool Lab ID#: A No Detections Were Found. Client Sample ID: Room 105 Lab ID#: A No Detections Were Found. Client Sample ID: Preschool Lab ID#: A Client Sample ID: Kitchen Lab ID#: A No Detections Were Found. Client Sample ID: Weather Station Lab ID#: A No Detections Were Found. Page 5 of 19

12 Summary of Detected s Client Sample ID: Swingset Lab ID#: A No Detections Were Found. Page 6 of 19

13 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Library Lab ID#: A Date of Collection: 10/7/17 8:00:00 AM Date of Analysis: 10/18/17 01:44 PM 1.0 Not Detected 5.1 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 0.66 Not Detected 0.21 Not Detected 0.89 Not Detected 0.21 Not Detected 0.89 Not Detected 0.21 Not Detected 0.89 Not Detected 0.21 Not Detected 0.78 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 7 of 19

14 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: BD Lab ID#: A Date of Collection: 10/7/17 8:01:00 AM Date of Analysis: 10/18/17 02:23 PM 1.1 Not Detected 5.3 Not Detected 0.22 Not Detected 1.1 Not Detected 0.22 Not Detected 1.1 Not Detected 0.22 Not Detected 0.69 Not Detected 0.22 Not Detected 0.94 Not Detected 0.22 Not Detected 0.94 Not Detected 0.22 Not Detected 0.94 Not Detected 0.22 Not Detected 0.82 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 8 of 19

15 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Room 101 Lab ID#: A Date of Collection: 10/7/17 8:08:00 AM Date of Analysis: 10/18/17 04:03 PM 1.0 Not Detected 4.9 Not Detected 0.20 Not Detected 0.99 Not Detected 0.20 Not Detected 0.99 Not Detected 0.20 Not Detected 0.64 Not Detected 0.20 Not Detected 0.87 Not Detected 0.20 Not Detected 0.87 Not Detected 0.20 Not Detected 0.87 Not Detected 0.20 Not Detected 0.76 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 9 of 19

16 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Pool Lab ID#: A Date of Collection: 10/7/17 8:15:00 AM Date of Analysis: 10/18/17 04:38 PM 1.1 Not Detected 5.2 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 0.68 Not Detected 0.21 Not Detected 0.92 Not Detected 0.21 Not Detected 0.92 Not Detected 0.21 Not Detected 0.92 Not Detected 0.21 Not Detected 0.80 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 10 of 19

17 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Room 105 Lab ID#: A Date of Collection: 10/7/17 8:23:00 AM Date of Analysis: 10/18/17 05:23 PM 1.0 Not Detected 5.1 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 0.66 Not Detected 0.21 Not Detected 0.89 Not Detected 0.21 Not Detected 0.89 Not Detected 0.21 Not Detected 0.89 Not Detected 0.21 Not Detected 0.78 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 11 of 19

18 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Preschool Lab ID#: A Date of Collection: 10/7/17 8:32:00 AM Date of Analysis: 10/18/17 06:08 PM 1.0 Not Detected 5.1 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 0.66 Not Detected 0.21 Not Detected 0.89 Not Detected 0.21 Not Detected 0.89 Not Detected 0.21 Not Detected 0.89 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 12 of 19

19 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Kitchen Lab ID#: A Date of Collection: 10/7/17 8:34:00 AM Date of Analysis: 10/18/17 06:43 PM 1.0 Not Detected 4.9 Not Detected 0.20 Not Detected 0.99 Not Detected 0.20 Not Detected 0.99 Not Detected 0.20 Not Detected 0.64 Not Detected 0.20 Not Detected 0.87 Not Detected 0.20 Not Detected 0.87 Not Detected 0.20 Not Detected 0.87 Not Detected 0.20 Not Detected 0.76 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 13 of 19

20 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Weather Station Lab ID#: A Date of Collection: 10/7/17 8:45:00 AM Date of Analysis: 10/18/17 07:18 PM 1.1 Not Detected 5.2 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 1.0 Not Detected 0.21 Not Detected 0.68 Not Detected 0.21 Not Detected 0.92 Not Detected 0.21 Not Detected 0.92 Not Detected 0.21 Not Detected 0.92 Not Detected 0.21 Not Detected 0.80 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 14 of 19

21 File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Swingset Lab ID#: A Date of Collection: 10/7/17 8:50:00 AM Date of Analysis: 10/18/17 07:54 PM 1.1 Not Detected 5.3 Not Detected 0.22 Not Detected 1.1 Not Detected 0.22 Not Detected 1.1 Not Detected 0.22 Not Detected 0.69 Not Detected 0.22 Not Detected 0.94 Not Detected 0.22 Not Detected 0.94 Not Detected 0.22 Not Detected 0.94 Not Detected 0.22 Not Detected 0.82 Not Detected Container Type: 6 Liter Summa Canister Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 15 of 19

22 File Name: v101806a Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Client Sample ID: Lab Blank Lab ID#: A Date of Collection: NA Date of Analysis: 10/18/17 12:13 PM 0.50 Not Detected 2.4 Not Detected 0.10 Not Detected 0.49 Not Detected 0.10 Not Detected 0.49 Not Detected 0.10 Not Detected 0.32 Not Detected 0.10 Not Detected 0.43 Not Detected 0.10 Not Detected 0.43 Not Detected 0.10 Not Detected 0.43 Not Detected 0.10 Not Detected 0.38 Not Detected Container Type: NA - Not Applicable Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Page 16 of 19

23 Client Sample ID: CCV Lab ID#: A File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Container Type: NA - Not Applicable Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Date of Collection: NA Date of Analysis: 10/18/17 08:37 AM Page 17 of 19

24 Client Sample ID: LCS Lab ID#: A File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Container Type: NA - Not Applicable Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Date of Collection: NA Date of Analysis: 10/18/17 09:26 AM Not Spiked Page 18 of 19

25 Client Sample ID: LCSD Lab ID#: AA File Name: v Dil. Factor: ,2,3-Trimethylbenzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Benzene Ethyl Benzene m,p-xylene o-xylene Container Type: NA - Not Applicable Surrogates 1,2-Dichloroethane-d4 -d8 4-Bromofluorobenzene Date of Collection: NA Date of Analysis: 10/18/17 10:16 AM Not Spiked Page 19 of 19

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