August 2012 Air Quality Report Garfield Avenue Site

Transcription

1 August 2012 Air Quality Report Garfield Avenue Site Attached is a technical summary of air-quality data for August 2012 at the Garfield Avenue cleanup site submitted by PPG Industries lead environmental consultant to the New Jersey Department of Environmental Protection. This document provides detailed results that supplement data from the air monitoring program published on the partnership s website, In particular, this report provides information about conditions at the fenceline and along the edge of cleanup work areas. Also, this document notes any deviations from the monitoring plan and work schedule caused by factors beyond the control of cleanup contractors, such as inclement weather and malfunctioning equipment.

2 Submitted to: Submitted by: PPG Industries, Inc. AECOM Jersey City, NJ Chelmsford, MA A September 27, 2012 Monthly Air Monitoring Report PPG Garfield Avenue Site 114 Jersey City, New Jersey Reporting Period: August 2012

3 i Monthly Air Monitoring Report PPG Garfield Avenue Site114 Jersey City, New Jersey Reporting Period: August 2012 Prepared By: Danielle Wineberg Reviewed By: Leo Gendron September 27, 2012

4 ii Contents 1.0 Introduction Air Monitoring Integrated Air Sampling Integrated Cr6 Sampling Integrated PM 10 Sampling Real-Time Continuous Air Monitoring Fenceline Exclusion Zone Perimeter Meteorological Measurements Site-Specific Acceptable Air Concentration and Real-Time Action Levels Integrated Cr6 Acceptable Air Concentration Real-Time Alert and Action Levels Air Sampling and Monitoring Results Integrated Air Sampling Results Cr6 Sampling Results PM 10 Sampling Results Integrated Air Sampling Results Summary Real-Time Air Monitoring Results PM 10 Monitoring Results TVOC Monitoring Results H 2 S Monitoring Results Hand-held Monitoring Results Meteorological Monitoring Results Site Activities Site Map(s) Conclusions

5 iii List of Appendices Appendix A Monthly Results Summaries Appendix B Program-to-Date Result Summaries Appendix C Detailed Integrated 8-Hour Cr6 Result Summaries Appendix D Running Cr6 Metrics Appendix E Integrated 24-Hour and 72-Hour Cr6 Result Summaries Appendix F Real-Time H 2 S Monthly Results Summary

6 iv List of Tables Table 2-1: Air Monitoring Approach Table 3-1: Running Cr6 Metrics Table 3-2: Site-Specific Alert and Action Levels Table 4-1: Short-Term Average 8-Hour Integrated Cr6 Metrics List of Figures Figure 2-1: Site Overview

7 v List of Acronyms AAC Acceptable Air Concentration AMP Air Monitoring Plan AMS Air Monitoring Station BTEX Benzene, Toluene, Ethylbenzene, and Xylene Cr6 Hexavalent Chromium FAM Fixed Air Monitoring GC Gas Chromatograph H 2 S Hydrogen Sulfide LPM Liters per Minute ng/m 3 Nanograms per Cubic Meter of Air NJDEP New Jersey Department of Environmental Protection PAM Portable Air Monitoring PM 10 Particulate Matter 10 Microns or less in Diameter PPG PPG Industries, Inc. ppb Parts per Billion ppm Parts per Million TSP Total Suspended Particulate TVOC Total Volatile Organic Compounds µg/m 3 Micrograms per Cubic Meter of Air

8 ES-1 Executive Summary Air monitoring conducted at the PPG Garfield Avenue Site 114 was completed in accordance with the Site-specific Air Monitoring Plan (AMP), and included sampling and analysis for 8-hour integrated hexavalent chromium (Cr6) and particulate matter with a diameter of 10 microns or less (PM 10 ), as well as real-time continuous monitoring for PM 10 and total volatile organic compounds (TVOC) at 14 Air Monitoring Station (AMS) locations (10 at the Site perimeter and 4 along the exclusion zone). In addition to the air monitoring conducted in accordance with the AMP, real-time H 2 S monitoring and 24-hour Cr6 sampling with lab analysis was also conducted at the fenceline. This program is designed to measure various aspects of air quality at the Site to ensure that remedial activities at the Site do not have an adverse effect on Site workers and the surrounding community. Results of the integrated Cr6 sampling and analysis indicate that program-to-date average airborne Cr6 concentrations are significantly below the Acceptable Air Concentration (AAC) at each of the AMS locations. The results and calculations document continuing compliance with the current AAC set by New Jersey Department of Environmental Protection (NJDEP), confirm that dust control measures continue to be effective, and indicate that the levels of Cr6 in dust generated at the Site are not likely to pose a significant risk to off-site receptors.

9 Introduction This monthly air monitoring report update includes both tabular information and written discussions summarizing the ambient air-quality data collected in accordance with the Air Monitoring Plan (AMP) at the PPG Industries Inc. (PPG) Garfield Avenue Site 114 (referred herein as Site), in Jersey City, New Jersey. This monthly report is designed to provide a summary of the air monitoring data collected between the baseline period and the end of the reporting period, while focusing on the latest month of data collection results. This monthly report includes both monthly and program-to-date summaries of the following: Integrated hexavalent chromium (Cr6) analytical results; Integrated particulate matter (PM 10 ) analytical results; Real-time 15-minute average PM 10 concentrations; Real-time 15-minute average total volatile organic compounds (TVOC) concentrations, and benzene, toluene, ethylbenzene, and xylenes (collectively referred to as BTEX) concentrations if speciation was required; Real-time 24-hour average hydrogen sulfide (H 2 S) concentrations; Real-time hand-held PM 10, TVOC and H 2 S concentrations; and Meteorological conditions. Results have been evaluated and compared to the Site-specific Acceptable Air Concentration (AAC) and the Action Levels in accordance with the AMP.

10 Air Monitoring This report summarizes air monitoring at the PPG Site performed between the baseline period and the end of the reporting period, with a focus on data collected during the recent month of activities. The baseline period includes data measured between June 6, 2010 and June 30, Routine sampling began on July 1, 2010 with the start of ground intrusive activities on-site. Fourteen air monitoring stations (AMS) installed at the Site provide two layers of protection in terms of air monitoring. The first level of air monitoring (used as an early warning indicator) includes 4 portable air monitoring (PAM) stations located at the boundary of the exclusion zone (active work area). The second level of air monitoring is conducted at 4 fixed air monitoring (FAM) stations plus 4 PAM stations at the fenceline of the Site. Additionally, 2 FAM stations were added to the program on April 5, 2012 to enhance the fenceline air monitoring system during excavation activities in the southwest corner of the Site. Figure 2-1 provides an overview of the Site and a typical configuration of the AMS. Table 2-1 provides an overview of the air monitoring approach at each of the AMS. Air monitoring results to date have confirmed protection of the community, and the overall effectiveness of the program will be evaluated on a continuous basis. Success will ultimately be determined at the end of the remediation program when the average Cr6 concentrations at each AMS location are compared to the AAC. This monthly report has been designed to evaluate the program s effectiveness on a monthly basis. The Cr6 average concentrations measured at each AMS will continually be compared to the Site-specific AAC for Cr6 to confirm the effectiveness of the program. Thus, the monthly reports will focus largely on the integrated analytical results collected as part of the Cr6 fenceline air monitoring. Air monitoring data collected at the Site includes: 8-hour integrated Cr6 and PM 10 sample collection at the fenceline and the perimeter of the exclusion zone and the laboratory analysis; 24-hour and 72-hour integrated Cr6 sample collection at the fenceline and laboratory analysis; Real-time/continuous 15-minute average PM 10, TVOC and H 2 S concentrations measured at the fenceline (15-minute H 2 S averages are computed into 24-hour averages per Amendment 4 of the AMP); and Real-time/continuous 5-minute average PM 10 and TVOC concentrations measured along the perimeter of the exclusion zone. This section outlines the types of data collected, frequency of collection, and the corresponding locations.

11 2-2 Figure 2-1: Site Overview FAM-2 FAM-1 PAM-4 PAM-C FAM-3 PAM-B PAM-1 PAM-2 FAM-6 PAM-D PAM-A FAM-4 FAM-5 PAM-3 Legend Fenceline Fixed Air Monitoring Station Fenceline Portable Air Monitoring Station Perimeter of the Exclusion Zone Portable Air Monitoring Station H 2 S Monitoring Station * Daily/weekly Site maps for the report period are included in Appendix A.

12 2-3 Table 2-1: Air Monitoring Approach Integrated Air Monitoring Real-Time/Continuous Air Monitoring Fenceline FAM-1, 2, 3, 4, 5 and 6 PAM-1, 2, 3 and 4 Integrated 8-hour Cr6 and PM 10 sampling and analysis 5 days per week (Monday Friday). 24-hour and 72-hour Cr6 sampling and analysis at 2 of the FAM stations (FAM-2 and FAM-3) 7 days per week. Integrated 8-hour Cr6 and PM 10 sampling and analysis 5 days per week (Monday Friday). 15-minute average PM 10 and TVOC concentrations measured 24 hours per day and 7 days per week. Periodic real-time constituentspecific VOC sampling for BTEX compounds (BTEX monitoring required only if the TVOC Action Level is exceeded). 15-minute average PM 10 and TVOC concentrations measured 8-10 hours per day, 5 days per week (Monday Friday). FAM-2, 3 and minute average H 2 S concentrations measured 24 hours per day and 7 days per week. Exclusion Zone PAM-A, B, C and D Hand-Held Air Monitoring Integrated 8-hour Cr6 and PM 10 sampling and analysis 5 days per week (Monday Friday) minute average PM 10 and TVOC concentrations measured 8-10 hours per day, 5 days per week (Monday Friday). Periodic (several times per day (Monday Friday)) monitoring for PM 10, TVOC and H 2 S at various locations. 2.1 Integrated Air Sampling Integrated Cr6 and PM 10 samples are collected at each of the fenceline and exclusion zone perimeter AMS for an 8-hour to 10-hour duration each working day (Monday Friday). The AIRMETRICS MiniVol tactical air sampler is used for the integrated sampling of PM 10 and Cr6 collected on 47 mm filters. Collection of separate samples at each AMS is achieved by using two separate MiniVol samplers, one for Cr6 and one for PM 10 at each of the 14 AMS Integrated Cr6 Sampling For the first several months of Cr6 sample collections during intrusive activities at the Site, the MiniVols were configured to collect samples for total suspended particulate (TSP) and the sampling

13 2-4 flow rate was set to approximately 3.5 liters per minute (LPM) as specified in the operational specifications for the sampler. The sample inlets on each of the Cr6 integrated samplers were upgraded on December 9, 2010 to include a 10 micron particle size separator (impactor) and the sampling flow rate was adjusted to approximately 5.0 LPM as required by the operational specifications for the impactor. The exposed Cr6 filters are shipped to a New Jersey Department of Environmental Protection (NJDEP)- certified analytical laboratory for Cr6 analysis using OSHA Method 215. The sample weights are provided by the laboratory with a laboratory detection limit of ng. The sample weights and flow information (carefully documented in the field) are utilized to calculate 8-hour to 10-hour integrated Cr6 air concentrations in nanograms per cubic meter of air. Filter weights reported as non-detect are included in the concentration calculation at one half the laboratory detection limit for data reporting purposes. In addition to sampling performed during working hours, 24-hour and 72-hour Cr6 sampling and analysis are also performed at 2 fenceline AMS. These longer duration samples were added to the program on July 16, 2010 to monitor Cr6 concentrations during overnight and weekend periods. The 24-hour samples are typically collected daily from 7AM to 7AM Monday through Thursday, and a single 72-hour sample is collected from Friday 7AM through Monday 7AM from each of the 2 AMS Integrated PM 10 Sampling The PM 10 samples are collected using the MiniVols that are configured to draw air at approximately 5 LPM through a 10 micron particle size separator (impactor) and then through a 47mm filter. The filters are weighed pre- and post-exposure by the gravimetric laboratory to determine the total change in weight in the sample media with a laboratory detection limit of 0.05 mg. The sample weights and the flow information (carefully documented in the field) are utilized to calculate 8-hour to 10-hour integrated PM 10 concentrations in micrograms per cubic meter of air. Sample weights reported as nondetect are included in the concentration calculation at one half the laboratory detection limit for data reporting purposes. 2.2 Real-Time Continuous Air Monitoring Continuous/real-time air monitoring is divided into three types of monitoring including: fenceline air monitoring (at the Site property fenceline), exclusion zone monitoring (at the perimeter of the exclusion zone), and meteorological monitoring (at a central on-site location). Each monitoring type is described in more detail in the following sections Fenceline Fenceline air monitoring is currently performed at 6 FAM stations and 4 PAM stations. Two additional FAM stations were added to the program on April 5, 2012 to enhance the fenceline air monitoring system during excavation activities in the southwest corner of the Site. Fenceline monitoring includes the following: Continuous/Real-time 15-minute average PM 10 and TVOC concentrations at each of the 10 fenceline locations (FAM stations operate 24 hours per day and 7 days per week while PAM stations operate 8-10 hours per day, 5 days per week (Monday Friday));

14 2-5 Periodic real-time constituent-specific VOC sampling for BTEX compounds at the 6 FAM stations (BTEX monitoring only if the TVOC Action Level is exceeded at any of the FAM stations); and Continuous/Real-time 15-minute average H 2 S concentrations at 3 of the fenceline locations (H 2 S monitoring began on May 3, 2012 to enhance the fenceline air monitoring during excavation) Exclusion Zone Perimeter Exclusion zone perimeter air monitoring is performed at 4 PAM stations. Exclusion zone perimeter air monitoring includes the following: Continuous/real-time 5-minute average PM 10 and TVOC concentrations at each of the 4 exclusion zone perimeter locations (PAM stations operate 8-10 hours per day, 5 days per week (Monday Friday)); Periodic (several times per day) hand-held sampling for PM 10, TVOC and H 2 S at various locations around the perimeter of the exclusion zone Meteorological Measurements Meteorological measurements of 15-minute average wind direction, wind speed, sigma theta (wind variation), relative humidity, and temperature are recorded onsite at a central location.

15 Site-Specific Acceptable Air Concentration and Real-Time Action Levels Site-specific AAC and real-time Action Levels have been developed for Cr6, PM 10 and TVOC concentrations by NJDEP as part of the approved AMP, in compliance with risk assessment procedures. The AAC and real-time Action Levels have been developed to protect off-site receptors from potential adverse health impacts from Cr6, TVOC, BTEX, H 2 S, and particulates over the duration of the intrusive remediation activities. Real-time monitoring and integrated results are compared against the AAC and the real-time Action Levels to alert Site management of the potential need to enhance control of emissions and curtail operations to maintain concentrations at levels below the specified criteria. The AAC and real-time Action Levels for integrated Cr6 concentrations and real-time PM 10 and TVOC concentrations are outlined in the following sections. 3.1 Integrated Cr6 Acceptable Air Concentration A Site-specific Cr6 AAC has been developed by NJDEP to protect off-site receptors from potential adverse health impacts due to potential exposure to Cr6 in dust. The AAC for Cr6 was developed to represent the maximum allowable average concentration of Cr6 in dust at each AMS over the project duration. In accordance with New Jersey regulatory requirements, the AAC represents a maximum level corresponding to a one in one million (1E-06) excess cancer risk to nearby residents due to potential exposure to Cr6 emanating from the Site. The AAC of 49 ng/m 3 is applicable at the Site fenceline and represents the maximum allowable average concentration measured over the project duration and was developed to ensure the protection of human health. This AAC also provides a value to evaluate the effectiveness of dust control. To ensure ongoing compliance with the AAC, shorter duration rolling averages are utilized to provide for the early and regular assessment of performance trends and, if necessary, allow for responsive corrective measures to be implemented to ensure that emissions of Cr6 are maintained well below the AAC over the duration of the project, and are minimized to the greatest extent practical. These shorter duration average concentrations metrics include: program-to-date, 90-day, 60-day, and 30-day running averages where the average Cr6 concentration over the previous 90-day, 60-day, and 30-day periods are calculated for each sample day. Sampling days are considered days where routine sampling was conducted (typically Monday Friday). The shorter term average concentrations are compared against the list of metrics provided in Table 3-1 which also depicts respective response actions.

16 3-2 Table 3-1: Running Cr6 Metrics Metric Observation 30-day 1 Cr6 average concentration greater than or equal to 45 ng/m 3 60-day 1 Cr6 average concentration greater than or equal to 40 ng/m 3 90-day 1 Cr6 average concentration greater than or equal to 35 ng/m 3 Response Action External meeting (appropriate JCO participants) to review levels, evaluate activities each day when elevated concentrations were observed, and trigger corrective action (defined in the Dust Control Plan 2010) if required. 1 Sampling days. 3.2 Real-Time Alert and Action Levels A series of real-time/continuous Alert and Action Levels were designed to monitor and assist in control of Site emissions to ensure protection of human health, and represent an important aspect of the remedial program at the Site. The real-time Alert and Action Levels used on-site are shown in Table 3-2. Table 3-2: Site-Specific Alert and Action Levels Parameter Early Warning Alert Level Fenceline (1-min) Alert Level Exclusion Zone and Fenceline (5- or 15-min) Early Warning Action Level Exclusion Zone (5-min or Instantaneous) Action Level Fenceline (15-min or 24-hr) PM µg/m µg/m µg/m µg/m 3 TVOC NA 0.7 ppm 0.9 ppm 0.9 ppm H 2 S NA 20 ppb 1000 ppb* 20 ppb** * Early Warning Action Level at the Exclusion Zone is based on the Exclusion Zone Action Level included in the AECOM Health & Safety Plan for the site of 10 ppm. By incorporating an additional safety factor of 10 AECOM developed the Early Warning Action Level at the Exclusion Zone of 1000 ppb (instantaneous concentration). **Action Level at the Site Fenceline is based on the ATSDR MRL of 28 µg/m3, or 20 ppb, for intermediate duration exposure to H 2 S. NA = Not Applicable

17 Air Sampling and Monitoring Results Results of air sampling and monitoring conducted between June 9, 2010 and August 31, 2012 are summarized herein. The following sections present both tabular and written discussions of the air sampling and monitoring results for the reporting period including: Monthly integrated and real-time results; Program-to-date integrated and real-time statistics; Evaluation of program success versus the Site-specific AAC and Action Levels; Meteorological results; and Correlation of results to Site activities. Air sampling and monitoring results are presented in detail in the Appendices of this report. Appendix A includes summary of the air sampling and monitoring results for the reporting period. Appendix B includes program-to-date statistics and monthly comparison of results. Appendix C and Appendix D include the detailed Cr6 plots and running Cr6 metrics, respectively. Appendix E includes a summary of the 24-hour and 72-hour sampling results. Appendix F includes a summary of the H 2 S air sampling and monitoring results for the reporting period. 4.1 Integrated Air Sampling Results Results of the integrated Cr6 and PM 10 sampling and analysis are presented in the following sections Cr6 Sampling Results Results of the Cr6 sampling from the reporting period and a program-to-date evaluation are discussed in the following sections. Reporting Period Individual integrated 8-hour Cr6 concentrations measured at the fenceline and exclusion zone perimeter during the reporting period are presented in Table A-1. If an individual sample result exceeds 80% of the project duration AAC, additional evaluation and review of relevant Site conditions and activities were performed to potentially modify procedures if necessary to reduce the potential for increasing Cr6 concentration trends. Any elevated concentration data during the reporting period are listed and discussed in Table A-3. Results of the 24-hour and 72-hour Cr6 sampling and analysis are included in Appendix E and demonstrate that Cr6 concentrations during overnight and weekend periods continue to remain below the AAC.

18 4-4 Program-to-Date Sampling and analytical statistics for integrated 8-hour Cr6 results are shown in Table B-1 and include various program-to-date metrics relative to Cr6 analytical data. Monthly average 8-hour Cr6 concentration results are shown in Table B-2 for each AMS location. A snapshot of the program-to-date, 90-day, 60-day, and 30-day running Cr6 average concentrations at the end of the reporting period are shown in Table 4-1 and indicate that the Cr6 concentrations were well below the maximum acceptable Cr6 metrics for the reporting period. Detailed plots containing the individual sample concentrations and the program-to-date Cr6 average concentrations are included in Appendix C. Plots of the shorter duration 90-day, 60-day, and 30-day Cr6 running averages are included in Appendix D and document a similar trend in the Cr6 average concentrations at each AMS.

19 4-5 Table 4-1: Short-Term Average 8-Hour Integrated Cr6 Metrics Running Cr6 Metrics 1 Fenceline Exclusion Zone Perimeter Metric FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 FAM-6 PAM-1 PAM-2 PAM-3 PAM-4 PAM-A PAM-B PAM-C PAM-D 30-day day day Program-to-Date ng/m 3 nanograms per cubic meter 1 Running Cr6 metrics are utilized to provide for the early and regular assessment of performance trends and, if necessary, allow for responsive corrective measures to be implemented to ensure that emissions of Cr6 are maintained well below the AAC over the duration of the project, and are minimized to the greatest extent practical. The running Cr6 metrics are designed to evaluate the program success on short duration intervals (monthly) and do not represent the long term (program) ending success. 2 Running Cr6 metrics are valid on the last day in the report period and include the previous 30, 60, or 90 days of sample results. Plots of the running Cr6 metrics are included in Appendix D. 3 Program-to-Date Air monitoring conducted from July 1, 2010 through the end of the reporting period.

20 PM 10 Sampling Results Results of the 8-hour integrated PM 10 sampling and analysis from the reporting period and program-todate results are discussed in the following sections. Reporting Period Individual integrated 8-hour PM 10 concentrations measured at the fenceline and exclusion zone perimeter during the reporting period are presented in Table A-2. Program-to-date Sampling and analytical statistics for integrated PM 10 are shown in Table B-3 and include various metrics relative to PM 10 analytical data. Monthly average PM 10 concentration results are shown in Table B-4 for each AMS Integrated Air Sampling Results Summary There have been 529 sample days between July 1, 2010 and the end of the reporting period. The results of the sample analysis for the fenceline and the exclusion zone perimeter are summarized in the following sections. Fenceline Air Monitoring The program-to-date 8-hour Cr6 running average concentrations based upon lab analytical results at each fenceline AMS were less than 25% of the AAC, demonstrating that the dust control measures continue to be extremely effective. The detailed summaries included in Appendix C document that the program-to-date 8-hour Cr6 average results measured at each of the fenceline AMS have remained well below the AAC. The shortterm 90-day, 60-day, and 30-day Cr6 average concentrations at the fenceline AMS also remained below the respective short-term running metrics (plots shown in Appendix D). Exclusion Zone Perimeter Air Monitoring Although the compliance point for the AAC is at the Site fenceline, the program-to-date 8-hour Cr6 average results at each exclusion zone perimeter AMS were less than 25% of the AAC. One would expect that the average concentrations at the exclusion zone AMS would be higher than the fenceline AMS since the exclusion zone perimeter AMS are generally significantly closer to intrusive activities than the fenceline AMS. While there have been some individual daily 8-hour exclusion zone Cr6 concentrations greater than the project duration-based AAC (shown in Table B-1), this is not surprising given their proximity to intrusive work activities. This does not represent non-compliance with the Site AAC since the compliance point for the AAC is at the Site fenceline and the AAC represents an average over the project duration. The detailed summaries included in Appendix C document that the program-to-date 8-hour Cr6 average results measured at each of the exclusion zone perimeter AMS have remained well below the AAC. The short-term 90-day, 60-day, and 30-day Cr6 average concentrations at the exclusion zone perimeter AMS also remained below the respective short-term running metrics (plots shown in Appendix D).

21 Real-Time Air Monitoring Results Real-time/continuous air monitoring for PM 10 and TVOC was conducted at the fenceline (15-minute averages) and exclusion zone perimeter (5-minute averages) plus periodic hand-held instantaneous monitoring for PM 10, TVOC, and H 2 S was conducted at the exclusion zone perimeter. In addition, realtime/continuous air monitoring for H 2 S began on May 3, 2012 and is being conducted at the fenceline at FAM-2, 3 and 5 (24-hour averages are computed through measured 15-minute averages). The results of the real-time air monitoring are presented in the following sections PM 10 Monitoring Results Results of the real-time PM 10 sampling for the reporting period and program-to-date are discussed in the following sections. Reporting Period Real-time fenceline and exclusion zone perimeter PM 10 concentrations measured during the reporting period are presented in Figure A-1 and Figure A-3, respectively. Real-time PM 10 concentrations were compared directly to the PM 10 Action Level (333 µg/m 3 ) and concentrations greater than the Action Level are subject to additional evaluation. If applicable, elevated PM 10 concentrations are listed and discussed in Table A-3. Program-to-Date Real-time monthly average PM 10 concentrations measured are shown in Table B-5 for each AMS and dust concentrations measured on-site during the reporting period are similar to those observed during the baseline period (when no intrusive activities were occurring). This indicates that dust control measures during intrusive activities have been so effective that average dust concentrations measured during intrusive activities are very close to concentrations measured during the baseline period TVOC Monitoring Results Results of the real-time TVOC monitoring for the reporting period and program-to-date are discussed in the following sections. Reporting Period Real-time fenceline and exclusion zone perimeter TVOC concentrations measured during the reporting period are presented in Figure A-2 and Figure A-4, respectively. Real-time TVOC concentrations were compared directly to the TVOC Action Level (0.9 ppm). Any time that a real-time TVOC concentration is measured in excess of the Action Level additional analysis is performed via a specialized piece of equipment (gas chromatograph [GC]) that is installed at each FAM station. The GC is automatically activated and collects and analyzes an air sample only if TVOC concentrations measured at the FAM station exceed the Action Level. The GC is designed to speciate VOC and provide concentrations of specific VOC analytes of interest (BTEX). If applicable, elevated TVOC concentrations are listed and discussed in Table A-3.

22 4-8 Program-to-Date Real-time monthly average TVOC concentration measurements are shown in Table B-6 for each AMS and TVOC concentrations measured on-site during the reporting period continue to be similar to concentrations measured during the baseline period (when no intrusive activities were occurring). This indicates that ground intrusive activities have not increased VOC concentrations on-site H 2 S Monitoring Results Real-time fenceline H 2 S concentrations measured during the reporting period are presented in Table F- 1. Running 24-hour averages were compared directly to the H 2 S Action Level (20 ppb). Concentrations greater than the Action Level are subject to additional evaluation. If applicable, elevated H 2 S concentrations are listed and discussed in Table A Hand-held Monitoring Results Monitoring results collected as part of the hand-held monitoring program are documented in the field on field data sheets. The daily maximum concentrations measured are provided in the weekly and biweekly reports. 4.3 Meteorological Monitoring Results Wind rose plot depicting the frequency of wind direction and wind speed, and time series plots for wind speed, temperature, and relative humidity for the reporting period are show in Figure A-5 through Figure A-8, respectively. 4.4 Site Activities Site activities during the reporting period are documented and included in Table A Site Map(s) Site maps during the reporting period are documented and included in Figure A-9 though Figure A-10.

23 Conclusions Results of the project-to-date air sampling and monitoring program at Site 114 indicate that program-todate average Cr6 concentrations for each fenceline AMS are well below the AAC of 49 ng/m 3. The program-to-date concentrations and the short duration metrics illustrated in Appendix C and Appendix D, respectively, demonstrate that the dust control measures continue to be very effective at maintaining concentrations of Cr6 in dust at the Site well below the AAC. These results indicate that dust generated at the Site is not likely to pose a significant risk to off-site receptors.

24 Appendix A Monthly Results Summaries Integrated 8-Hour Cr6 Concentrations Integrated 8-Hour PM 10 Concentrations Real-time PM 10 and TVOC Concentrations Meteorological Results Site Activities Site Map(s)

25 Table A- 1: Daily Integrated 8-Hour Cr6 Sampling Results FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 Fenceline FAM-6 Exclusion Zone Perimeter 8/1/ /2/ /3/ /6/ /7/ /8/ /9/ /10/ /13/ /14/ /15/ /16/ /17/ /20/ /21/ /22/ ND /23/ /24/ /27/ /28/ /29/ /30/ /31/ PAM-1 PAM-2 PAM-3 PAM-4 ng/m 3 nanograms per cubic meter NA Not Applicable ND No Data Highlighted concentrations indicate concentrations greater than the AAC. If greater than the AAC, further analysis is presented in Table A-3. 1 Sample found to be invalid because of contamination from ground water and surface debris. PAM-A PAM-B PAM-C PAM-D

26 Table A- 2: Daily Integrated 8-Hour PM 10 Sampling Results FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 Fenceline FAM-6 Exclusion Zone Perimeter 8/1/ /2/ /3/ /6/ /7/ /8/ /9/ /10/ ND 1 8/13/ /14/ /15/ /16/ /17/ /20/ /21/ /22/ /23/ /24/ /27/ /28/ /29/ /30/ /31/ µg/m 3 micrograms per cubic meter NA Not Applicable ND No Data 1 Sample found to be invalid because sample duration did not meet method specification. PAM-1 PAM-2 PAM-3 PAM-4 PAM-A PAM-B PAM-C PAM-D

27 Figure A- 1: Real-Time Fenceline 15-Minute Average PM 10 Monitoring Results Action Level (333 µg/m 3 )

28 Figure A- 2: Real-Time Fenceline 15-Minute Average TVOC Monitoring Results Action Level (0.9 ppm)

29 Figure A-3: Real-Time Exclusion Zone Perimeter 5-Minute Average PM 10 Monitoring Results Action Level (333 µg/m 3 )

30 Figure A- 4: Real-Time Exclusion Zone Perimeter 5-Minute Average TVOC Monitoring Results Action Level (0.9 ppm)

31 Table A- 3: Elevated Concentration Summary Parameter Date Time Location Wind Conditions Elevated Concentration Explanation Fenceline Air Monitoring NA NA NA NA NA NA NA Exclusion Zone Perimeter Air Monitoring PM 10 Thu 8/23/12 8:30AM 11:05AM PAM-B SW 2.8 mph SW 4.1 mph Elevated PM 10 concentrations at PAM-B were caused by vehicle exhaust. The vacuum truck was parked in close proximity to PAM-B. FAM Fixed Air Monitoring Station PAM Portable Air Monitoring Station PM 10 Respirable Particulate Matter measured in micrograms per cubic meter H 2 S Hydrogen Sulfide ng/m 3 nanograms per cubic meter µg/m 3 micrograms per cubic meter ppb parts per billion ppm parts per million NA Not Applicable ND No Data - FAM/PAM reported TVOC and PM 10 values represent 15-minute or 5-minute block averages at the fenceline and the perimeter of the exclusion zone, respectively. Hand-held monitoring values represent instantaneous concentrations. - FAM/PAM reported Cr6 concentrations represent 8- to 10-hour average concentrations.

32 Figure A-5: Wind Rose

33 Figure A-6: Wind Speed

34 Figure A-7: Temperature

35 Figure A-8: Relative Humidity

36 Table A-4: August 2012 Site Actvities Green-Gray Mud Excavation and Hauling COPR-material Hazardous Concrete Non-Hazardous Concrete Non-Hazardous Soil Green-Gray Mud Loadout COPR-material Hazardous Concrete Non-Hazardous Soil / Concrete Backfill Backfill Placement Ammeded Backfill Placement Concrete Breakdown / Hammering Comments 8/1/2012 x x x x x x x x x x x x x x x 8/2/2012 x x x x x x x x x x x x x x x 8/3/2012 x x x x x x x x x x x x x x x 8/4/2012 x Weekend, No Site Activities 8/5/2012 x Weekend, No Site Activities 8/6/2012 x x x x x x x x x x x x 8/7/2012 x x x x x x x x x x x x x x 8/8/2012 x x x x x x x x x x x x x 8/9/2012 x x x x x x x x x x x x x x 8/10/2012 x x x x x x x x x x 8/11/2012 x Weekend, No Site Activities 8/12/2012 x Weekend, No Site Activities 8/13/2012 x x x x x x x x x x x x x 8/14/2012 x x x x x x x x x x x x x x 8/15/2012 x x x x x x x x x x x x x x x x 8/16/2012 x x x x x x x x x x x x x x x 8/17/2012 x x x x x x x x x x x x 8/18/2012 x Weekend, No Site Activities 8/19/2012 x Weekend, No Site Activities 8/20/2012 x x x x x x x x x x x x x x x 8/21/2012 x x x x x x x x x x x x x x 8/22/2012 x x x x x x x x x x x x x 8/23/2012 x x x x x x x x x x x x x x x x 8/24/2012 x x x x x x x x x x x x x x x x x 8/25/2012 x Weekend, No Site Activities 8/26/2012 x Weekend, No Site Activities 8/27/2012 x x x x x x x x x x x x x x 8/28/2012 x x x x x x x x x x x x x 8/29/2012 x x x x x x x x x x x x x 8/30/2012 x x x x x x x x x x x x x x x 8/31/2012 x x x x x x x x x x x x x Test Pits Street Sweeper Operation Soil Sieving Covering / Uncovering Stockpiles Vehicles Driving Vehicles Idling Water Misting Site Maintenance Air Monitoring

37 Figure A 9: Site Map(s) 8/1 8/15/12 FAM-2 FAM-1 PAM-4 PAM-C FAM-3 PAM-B PAM-2 PAM-1 FAM-6 PAM-D PAM-A FAM-4 FAM-5 PAM-3 *FAM-5 and FAM-6 were added to the AMP on April 5 and April 6, 2012, respectively, to enhance the fenceline air monitoring system during excavation activities in the southwest corner of the Site. Legend Fenceline Fixed Air Monitoring Station Fenceline Portable Air Monitoring Station Perimeter of the Exclusion Zone Portable Air Monitoring Station H 2 S Monitoring Station

38 Figure A 10: Site Map(s) 8/16 8/31/12 FAM-2 FAM-1 PAM-4 PAM-C FAM-3 PAM-1 PAM-B PAM-2 FAM-6 PAM-D PAM-A FAM-4 FAM-5 PAM-3 *FAM-5 and FAM-6 were added to the AMP on April 5 and April 6, 2012, respectively, to enhance the fenceline air monitoring system during excavation activities in the southwest corner of the Site. Legend Fenceline Fixed Air Monitoring Station Fenceline Portable Air Monitoring Station Perimeter of the Exclusion Zone Portable Air Monitoring Station H 2 S Monitoring Station

39 Appendix B Program-to-Date Result Summaries Integrated 8-Hour Cr6 Concentration Summaries Integrated 8-Hour PM 10 Concentration Summaries Real-time PM 10 and TVOC Concentrations Summaries

40 Table B- 1: Program-to-Date Integrated 8-Hour Cr6 Sampling Results Statistics Statistics 1 Fenceline Exclusion Zone Perimeter FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 FAM-6 PAM-1 PAM-2 PAM-3 PAM-4 PAM-A PAM-B PAM-C PAM-D Total Number of Samples Rate of Data Collection 99.6% 99.8% 99.6% 99.8% 100.0% 100.0% 99.6% 99.6% 99.5% 99.1% 98.7% 98.4% 99.1% 98.6% Total Number of Detected Samples % of Cr6 Samples Greater than Laboratory Detection Limit 1.8% 4.2% 1.1% 1.3% 0.0% 0.0% 2.5% 0.5% 1.8% 1.3% 4.0% 4.6% 4.2% 2.9% Total Number of Samples Above the AAC (49 ng/m 3 ) Average % Cr6 in Dust % 0.044% 0.042% 0.040% 0.031% 0.028% 0.040% 0.037% 0.037% 0.035% 0.037% 0.036% 0.038% 0.035% Maximum % Cr6 in Dust % 0.318% 0.197% 0.142% 0.063% 0.068% 0.411% 0.128% 0.181% 0.172% 0.233% 0.197% 0.450% 0.406% ng/m 3 nanograms per cubic meter 1 Statistics calculated based on the program start date of July 1, Total number of samples collected since July 1, Variations in the number of samples collected are specifically identified in Table A-1 within the report month of the variation. In general variations are caused by sampler malfunctions, site activities, weather conditions, and etc.. 3 Total number of sample results since July 1, 2010 reported above the laboratory reporting limit. 4 The program-to-date average and maximum percent Cr6 in dust was calculated using all the integrated PM 10 and Cr6 sample results collected since July 1, FAM-5 and FAM-6 were added to the AMP on April 5, 2012.

41 Table B- 2: Monthly Average Integrated 8-Hour Cr6 Sampling Results Fenceline Exclusion Zone Perimeter FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 FAM-6 PAM-1 PAM-2 PAM-3 PAM-4 PAM-A PAM-B PAM-C PAM-D Baseline NA 2 NA Jul NA 2 NA Aug NA 2 NA Sep NA 2 NA Oct NA 2 NA Nov NA 2 NA Dec NA 2 NA Jan NA 2 NA Feb NA 2 NA Mar NA 2 NA Apr NA 2 NA May NA 2 NA Jun NA 2 NA Jul NA 2 NA Aug NA 2 NA Sep NA 2 NA Oct NA 2 NA Nov NA 2 NA Dec NA 2 NA ng/m 3 nanograms per cubic meter 1 Baseline Air monitoring conducted prior to the beginning of excavation activities (6/9/10 6/30/10). 2 FAM-5 and FAM-6 were added to the AMP on April 5, 2012 to enhance the fenceline air monitoring system during excavation activities in the southwest corner of the Site. 3 Program-to-Date Air monitoring conducted from July 1, 2010 through the end of the report period.

42 Table B-2: Monthly Average Integrated 8-Hour Cr6 Sampling Results, Continued Fenceline Exclusion Zone Perimeter FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 FAM-6 PAM-1 PAM-2 PAM-3 PAM-4 PAM-A PAM-B PAM-C PAM-D Jan NA 2 NA Feb NA 2 NA Mar NA 2 NA Apr May Jun Jul Aug Program-to- Date ng/m 3 nanograms per cubic meter 1 Baseline Air monitoring conducted prior to the beginning of excavation activities (6/9/10 6/30/10). 2 FAM-5 and FAM-6 were added to the AMP on April 5, 2012 to enhance the fenceline air monitoring system during excavation activities in the southwest corner of the Site. 3 Program-to-Date Air monitoring conducted from July 1, 2010 through the end of the report period.

43 Table B- 3: Program-to-Date Integrated PM 10 8-Hour Sampling Results Statistics Statistics 1 Fenceline Exclusion Zone Perimeter FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 FAM-6 PAM-1 PAM-2 PAM-3 PAM-4 PAM-A PAM-B PAM-C PAM-D Total Number of Samples Rate of Data Collection 98.7% 98.9% 98.9% 99.1% 100.0% 100.0% 99.1% 98.6% 98.7% 98.7% 98.2% 98.2% 98.7% 98.4% Total Number of Detected Samples % Detection 43.9% 45.1% 43.8% 48.6% 59.0% 64.8% 52.5% 54.2% 56.0% 59.1% 58.5% 57.0% 59.3% 62.4% 1 Statistics calculated based on the program start date of July 1, Total number of sample collected since July 1, Variations in the number of samples collected are specifically identified in Table A-2 within the report month of the variation. 3 Total number of sample results since July 1, 2010 reported above the laboratory reporting limit. FAM-5 and FAM-6 were added to the AMP on April 5, 2012.

44 Table B- 4: Monthly Average Integrated 8-hour PM 10 Sampling Results Fenceline Exclusion Zone Perimeter FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 FAM-6 PAM-1 PAM-2 PAM-3 PAM-4 PAM-A PAM-B PAM-C PAM-D Baseline NA 2 NA Jul NA 2 NA Aug NA 2 NA Sep NA 2 NA Oct NA 2 NA Nov NA 2 NA Dec NA 2 NA Jan NA 2 NA Feb NA 2 NA Mar NA 2 NA Apr NA 2 NA May NA 2 NA Jun NA 2 NA Jul NA 2 NA Aug NA 2 NA Sep NA 2 NA Oct NA 2 NA Nov NA 2 NA Dec NA 2 NA µg/m 3 micrograms per cubic meter 1 Baseline Air monitoring conducted prior to the beginning of excavation activities (6/9/10 6/30/10). 2 FAM-5 and FAM-6 were added to the AMP on April 5, 2012 to enhance the fenceline air monitoring system during excavation activities in the southwest corner of the Site. 3 Program-to-Date Air monitoring conducted from July 1, 2010 through the end of the report period.

45 Table B-4: Monthly Average Integrated 8-hour PM 10 Sampling Results, Continued Fenceline Exclusion Zone Perimeter FAM-1 FAM-2 FAM-3 FAM-4 FAM-5 FAM-6 PAM-1 PAM-2 PAM-3 PAM-4 PAM-A PAM-B PAM-C PAM-D Jan NA 2 NA Feb NA 2 NA Mar NA 2 NA Apr May Jun Jul Aug Program-to- Date µg/m 3 micrograms per cubic meter 1 Baseline Air monitoring conducted prior to the beginning of excavation activities (6/9/10 6/30/10). 2 FAM-5 and FAM-6 were added to the AMP on April 5, 2012 to enhance the fenceline air monitoring system during excavation activities in the southwest corner of the Site. 3 Program-to-Date Air monitoring conducted from July 1, 2010 through the end of the report period.