Activities during Reporting Period Activities completed during the reporting period are summarized below.

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1 June 10, 2016 Mr. Ed Jones Washington State Department of Ecology Northwest Regional Office th Avenue SE Bellevue, Washington Re: Progress Report January through March 2016 Art Brass Plating, Seattle, Washington Agreed Order No. DE Project No Dear Ed: This progress report summarizes activities Aspect Consulting, LLC, (Aspect) conducted on the Art Brass Plating project for the period January through March Work is being completed per the referenced Agreed Order between Art Brass Plating (Art Brass) and the Department of Ecology (Ecology). Activities during Reporting Period Activities completed during the reporting period are summarized below. Remedial Investigation The following Remedial Investigation (RI) activities were completed during this reporting period: The first quarter of groundwater monitoring was completed between March 22 and 23, Validated groundwater monitoring results are presented in Tables 1, 2, and 3, and well locations are depicted on Figure 1. Lab certificates and the validation report are provided in Appendix A. Figures 2 through 4 depict groundwater concentrations of tetrachloroethylene, trichloroethylene (TCE), and vinyl chloride, using the most recent available data for a given well. Previous results from prior groundwater grab samples as well as data from Blaser Die Casting and Capital Industries are also presented on those figures. Where multiple grab samples were collected within a given sampling interval, the highest reported value for that interval is depicted on the figure. Interim Action Measures The following activities were completed during this reporting period: The soil vapor extraction (SVE) system generally ran continuously during this reporting period. No significant adjustments were made to individual SVE flow rates. The air sparge (AS) system remained off through March; the system has been off since the beginning of October as part of planned pulsed operation. Semiannual groundwater sampling was conducted at select source area monitoring wells in March, in accordance with the approved site-wide groundwater monitoring program. e a r t h + w a t e r Aspect Consulting, LLC 401 2nd Avenue S. Suite 201 Seattle, WA

2 Washington State Department of Ecology Project No June 10, 2016 As part of pulsed AS operations, the validated groundwater monitoring results from March were evaluated for changes in trichloroethylene (TCE) concentrations; results are illustrated on Figure 5. The following observations were made: o Concentrations of TCE in groundwater at PWM-1, MW-1, and MW-4 increased from September 2015 levels without operation of the AS system, as follows: The TCE concentration at PMW-1 (380 ug/l) did not exceed the maximum concentrations observed during initial rebound testing in or pulsed operation in , but did exceed the maximum rebound observed during pulsed operation in ; The TCE concentration at MW-1 (59 ug/l) was lower than the maximum concentrations observed during initial rebound testing in , pulsed operation in , or pulsed operation in ; The TCE concentration at MW-4 (19 ug/l) did not exceed the maximum concentrations observed during initial rebound testing in , but did exceed the maximum rebound observed during pulsed operation in ; The concentration of TCE in groundwater at MW-3 remained relatively stable since September 2015 (increased from 11 to 13 ug/l); The concentration of TCE in groundwater at MW-5 remained relatively stable since September 2015 (decreased from 4.5 to 3.6 ug/l); and The TCE concentrations at MW-2, MW-7, and MW-8 have not historically shown a significant or consistent response to pulsed operation of the AS system. These wells were not sampled in March. Performance monitoring of the SVE system was conducted in accordance with the Operation and Maintenance Plan, including: o Monthly monitoring of SVE system operating parameters, including air flow rate, vacuum, and TCE concentrations at each SVE well, vapor sump, trench, and total influent vapor using TCE detection tubes; o Monthly monitoring of pressure at sub-slab soil vapor monitoring points inside the 220 Findlay building and the Art Brass Plating facility only using a micro-manometer; o Monthly vapor sampling for chlorinated volatile organic compounds (CVOCs) by EPA Method TO-15 laboratory analysis from the total effluent vapor stream; and o Quarterly air sampling for CVOCs by EPA Method TO-15 laboratory analysis from the treatment system influent. Interim Performance Monitoring Data In accordance with the Operation and Maintenance Plan, this progress report includes interim performance monitoring data, comparison of the effectiveness of the interim measures with design goals, and, where appropriate, recommendations to improve system effectiveness. Performance monitoring data for the period from October 2015, through March 2016, are discussed below. Monthly monitoring data for the past year of operation are summarized in Tables 4 through 10 to show trends in performance. Page 2

3 Washington State Department of Ecology Project No June 10, Findlay Vapor Mitigation System The vapor mitigation system at 220 Findlay has operated continuously during the past 6 months. Vapor migration monitoring at sub-slab monitoring points has consistently demonstrated a negative pressure below the building and TCE has not been detected below the slab. SVE Operation, Flow Rate, and Vacuum The SVE system generally operated continuously over the past 6 months, with the exception of brief manual shutdowns for periodic maintenance and two circuit protection overloads during inclement weather in March. Flow rate and vacuum were generally observed within normal operating ranges. Fluctuations in flow measurements are attributed to the variability of the field instrument (anemometer) and conditions at the time of collection. Vacuums were relatively stable, but noticeably higher in the winter, presumably due to cold, wet weather that creates an accumulation of moisture in piping which also constricts flow, increases velocity, and results in higher flow readings calculated from the anemometer measurements. SVE flow rates and vacuums are summarized in Tables 4 and 5, respectively. AS Operation, Flow Rate, and Pressure The AS system has remained off since October 2015, as part of planned pulsed operation of the system, therefore there is no flow rate or pressure data. AS/SVE Balance The AS system has remained off since October 2015, as part of planned pulsed operation of the system, therefore it is not necessary to evaluate flow ratios between the AS and SVE systems. TCE Removal TCE concentrations extracted by the SVE system decreased slightly during the past 6 months as compared to the previous 6-month period. Overall mass removal rates remain low at less than 1 pound over the past 6 months. The decrease in mass removal rates are attributed to the AS system being off. TCE concentrations at individual wells are summarized in Table 6. Overall mass removal is estimated in Table 7. GAC Treatment Efficiency The efficiency of the granular activated carbon (GAC) controls has continued to decline and no longer appears to be providing any reduction in vapor concentrations. The decline in efficiency is attributed in part to the decline in influent concentrations, and GAC technology is not capable of economically achieving high levels of treatment efficiency with such low influent concentrations. Effluent concentrations of TCE remain below de minimis emission levels listed in Washington Administrative Code (WAC) (4.8 pounds per year), therefore change out of the GAC media is not recommended, nor required, at this time. Analytical results from influent and effluent samples collected using SUMMA canisters and analyzed for site-specific volatile organic compounds (VOCs) by EPA Method TO-15 are summarized in Table 8. Disconnection of the GAC controls is recommended. SVE Condensate Condensate does not accumulate at a significant rate in the storage tank. Over the past 6 months, condensate was generated in negligible amounts during manual draining of SVE lines using drain valves installed at low points in aboveground piping. Soil Vapor Migration Monitoring Subsurface soil vapor migration monitoring is only performed at the sub-slab soil vapor monitoring points located inside the 220 Findlay building and the Art Brass Plating facility when the AS system is not in operation. Vapor pressures remained negative at these points throughout this reporting period. Vapor pressures and TCE concentrations from vapor migration monitoring are summarized in Tables 9 and 10, respectively. Page 3

4 Washington State Department of Ecology Project No June 10, 2016 Vapor Intrusion Groundwater monitoring results were evaluated with respect to vapor intrusion (VI) considerations, in accordance with the requirements of the Groundwater Monitoring Plan. The completed evaluation worksheet using results of the March monitoring round is attached as Appendix B. Feasibility Study The W4 Group received Ecology s comments on the Draft Feasibility Study (FS) Report for Site Unit 1 (Aspect, 2016) on May 10, Public Communications The project website was updated with an electronic copy of the previous progress report. No other public communications were completed during this period. Anticipated Work in the Upcoming Quarter Work anticipated to be performed during the next progress reporting period (April through June 2016) is summarized below. Remedial Investigation The next groundwater monitoring event is scheduled for September Feasibility Study The W4 Group is in the process of reviewing Ecology s comments on the Draft FS Report for Site Unit 1. Interim Action Measures The following interim measure activities are anticipated to be performed during the next reporting period: The AS system will remain off pending final remedy selection. The need to restart the AS system as an interim measure will be reevaluated after September 2016 groundwater sampling results are evaluated for further rebound; Performance monitoring of the SVE system in accordance with the Operation and Maintenance Plan, including: o Monthly monitoring of SVE system operating parameters, including air flow rate, vacuum, and TCE concentrations at each SVE well, vapor sump, trench, and total influent vapor using TCE detection tubes; o Monthly monitoring of pressure at sub-slab soil vapor monitoring points inside the Art Brass Plating facility and the 220 Findlay building only using a micro-manometer; o Monthly vapor sampling of the SVE system total effluent for VOCs by EPA Method TO-15 laboratory analysis; o Quarterly vapor sampling of the SVE system total influent for VOCs by EPA Method TO-15 laboratory analysis; and o Disconnection of GAC controls and routing of the combined flow to the stack are recommended. Pending approval to disconnect, quarterly vapor sampling of the SVE system influent would be replaced with monthly sampling of the stack discharge. Page 4

5 Washington State Department of Ecology Project No June 10, 2016 Vapor Intrusion No vapor intrusion activities are expected during the next quarter. Groundwater Monitoring The next groundwater monitoring event is scheduled for September Public Communications The project website will be updated with an electronic copy of this progress report. No other public communications are anticipated. The next progress report, which will summarize activities completed from April through June 2016, will be submitted on or before September 20, If you have any questions or comments regarding this report or the project, please call at your earliest convenience. Sincerely, Aspect consulting, LLC Doug Hillman, LHG Principal Hydrogeologist (206) Attachments Table 1 Validated March 2016 Groundwater Quality Data Water Table Interval Table 2 Validated March 2016 Groundwater Quality Data Shallow Interval Table 3 Validated March 2016 Groundwater Quality Data Intermediate Interval Table 4 SVE System Parameters - Flow Rate Table 5 SVE System Parameters - Vacuum Table 6 SVE System Parameters - TCE Concentrations Table 7 TCE Mass Removal and Condensate Monitoring Table 8 Influent/Effluent Vapor Monitoring Using SUMMA Canisters Table 9 Soil Vapor Migration Monitoring - Pressure Table 10 Soil Vapor Migration Monitoring - TCE Concentration Figure 1 Monitoring Well Location Plan Figure 2 Tetrachloroethene (PCE) Occurrence in Groundwater Figure 3 Trichloroethene (TCE) Occurrence in Groundwater Figure 4 Vinyl Chloride Occurrence in Groundwater Figure 5 TCE Trends in Source Area Monitoring Wells Page 5

6 Washington State Department of Ecology Project No June 10, 2016 Appendix A Data Validation Report and Laboratory Certificates of Analyses Appendix B VI Evaluation Worksheet using March 2016 Groundwater Quality Results with link to electronic copy on project website: Janet Knox, Pacific Groundwater Group Peter Jewett, Farallon Consulting Bill Carroll, Pacific Crest Environmental Bill Beck, Stericycle V:\ Art Brass Plating\Progress Reports\2016 Q1\ABP Progress Report Q doc Page 6

7 TABLES

8 Table 1 - Validated March 2016 Groundwater Quality Data - Water Table Interval Project No , Art Brass Plating, Seattle, Washington Chemical Name Groundwater Cleanup Level Protective of Surface Water MW 1 03/22/16 MW 3 03/22/16 MW 4 03/22/16 Volatile Organic Compounds (VOC) 1,1,1 Trichloroethane in ug/l 1 U 1 U 1 U 1 U 1 U 1 U 1,1 Dichloroethane in ug/l U 1 1,1 Dichloroethene in ug/l U 1 U 1 U 1 U 1 U 1 U 1,2 Dichloroethane (EDC) in ug/l 1 UJ 1 U 1 U 1 U 1 U 1 UJ Chloroethane in ug/l 1 U 1 U 1 U 1 U 1 U 1 U cis 1,2 Dichloroethene (DCE) in ug/l Tetrachloroethene (PCE) in ug/l 29 1 U 1 U 1 U 1 U 1 U 1 U trans 1,2 Dichloroethene in ug/l 4, U 1 U 1 U 1 U 18 Trichloroethene (TCE) in ug/l Vinyl chloride in ug/l U 1 U 1 U 1 U 1 U 1 U Field Parameters Dissolved Oxygen in mg/l ORP in mvolts ph in ph Units Specific Conductance in us/cm Temperature in deg C Turbidity in NTU Notes Concentrations in shaded cells indicate value exceeds Groundwater Cleanup Level Protective of Surface Water MW 4 03/22/16 FD MW 5 03/22/16 PMW 1 03/22/16 U Analyte was not detected at or above the reported result. UJ Analyte was not detected at or above the reported estimate Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Table 1 - Validated March 2016 Groundwater Quality Data - Water Table Interval Table 1 ABP Progress Report Q1 Page 1 of 1

9 Table 2 - Validated March 2016 Groundwater Quality Data - Shallow Interval Project No , Art Brass Plating, Seattle, Washington Chemical Name Groundwater Cleanup Level Protective of Surface Water MW /22/16 MW /22/16 FD MW /22/16 Volatile Organic Compounds (VOC) 1,1,1 Trichloroethane in ug/l 0.2 U 0.2 U 0.2 U 4 U 2 U 0.2 U 0.2 U 10 U 0.2 U 1,1 Dichloroethane in ug/l U ,1 Dichloroethene in ug/l U 0.2 U U 2 U 0.2 U U 0.2 U 1,2 Dichloroethane (EDC) in ug/l 0.2 UJ 0.2 UJ 0.2 UJ 4 U 2 U 0.2 U 0.2 U 10 U 0.2 U Chloroethane in ug/l 0.2 U 0.2 U 0.2 U 4 U 2 U 0.2 U 0.2 U 10 U 0.41 cis 1,2 Dichloroethene (DCE) in ug/l U U Tetrachloroethene (PCE) in ug/l U 0.2 U 0.2 U 4 U 2 U 0.2 U 0.2 U 10 U 0.2 U trans 1,2 Dichloroethene in ug/l 4, U 0.2 U U U 0.2 U Trichloroethene (TCE) in ug/l U U Vinyl chloride in ug/l U 0.2 U U U 27 Field Parameters Dissolved Oxygen in mg/l ORP in mvolts ph in ph Units Specific Conductance in us/cm , ,173 Temperature in deg C Turbidity in NTU Notes Concentrations in shaded cells indicate value exceeds Groundwater Cleanup Level Protective of Surface Water MW /23/16 MW /23/16 MW /23/16 MW /23/16 MW /23/16 PSC CG /23/16 U Analyte was not detected at or above the reported result. UJ Analyte was not detected at or above the reported estimate Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Table 2 - Validated March 2016 Groundwater Quality Data - Shallow Interval Table 2 ABP Progress Report Q1 Page 1 of 1

10 Table 3 - Validated March 2016 Groundwater Quality Data - Intermediate Interval Project No , Art Brass Plating, Seattle, Washington Chemical Name Groundwater Cleanup Level Protective of Surface Water MW /23/16 MW /23/16 MW /22/16 Volatile Organic Compounds (VOC) 1,1,1 Trichloroethane in ug/l 10 U 0.2 U 0.2 U 10 U 1,1 Dichloroethane in ug/l U 1,1 Dichloroethene in ug/l U 0.2 U U 1,2 Dichloroethane (EDC) in ug/l 10 U 0.2 U 0.2 UJ 10 U Chloroethane in ug/l 10 U 0.2 U 0.2 U 10 U cis 1,2 Dichloroethene (DCE) in ug/l Tetrachloroethene (PCE) in ug/l U 0.2 U 0.2 U 10 U trans 1,2 Dichloroethene in ug/l 4, U 0.2 U U Trichloroethene (TCE) in ug/l 7 1, ,600 1,200 Vinyl chloride in ug/l Field Parameters Dissolved Oxygen in mg/l ORP in mvolts ph in ph Units Specific Conductance in us/cm Temperature in deg C Turbidity in NTU Notes Concentrations in shaded cells indicate value exceeds Groundwater Cleanup Level Protective of Surface Water MW /23/16 U Analyte was not detected at or above the reported result. UJ Analyte was not detected at or above the reported estimate Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Table 3 - Validated March 2016 Groundwater Quality Data - Intermediate Interval Table 3 ABP Progress Report Q1 Page 1 of 1

11 Table 4 - SVE System Parameters - Flow Rate Project No , Art Brass Plating, Seattle, Washington SVE Flow Rate (cfm) SVE-1 SVE-2 MW-1 MW-2 SVE-A SVE-B SVE-3A SVE-3B SVE-4A SVE-4B Red Zone Total MW-4 SVE-C SVE-D SVE-5A SVE-5B Yellow Zone Total MW-3 MW-5 SVE-E SVE-F Blue Zone Total MW-7 SVE-G SVE-6/7 Green Zone Total Combined - Stack 4/27/ /26/ /24/ /27/ /31/ /1/ /27/ /24/ /31/ /28/ NC /25/ /29/ NA = Not accessible, no measurement because of equipment blocking access to the monitoring ports. NC = Not collected due to moisture affecting anemomenter measurements. Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Tables 4-6_sys mon Table 4 APB Progress Report Q1 Page 1 of 1

12 Table 5 - SVE System Parameters - Vacuum Project No , Art Brass Plating, Seattle, Washington SVE Vacuum (inches water column) MW-1 MW-2 SVE-1 SVE-2 SVE-A SVE-B SVE-3A SVE-3B SVE-4A SVE-4B MW-4 SVE-C SVE-D SVE-5A SVE-5B MW-3 MW-5 SVE-E SVE-F MW-7 SVE-G SVE-6/7 Before KO Tank 4/27/ /26/ /24/ /27/ /31/ /1/ /27/ /24/ /31/ /28/ /25/ /29/ Before Blower Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Tables 4-6_sys mon Table 5 ABP Progress Report Q1 Page 1 of 1

13 Table 6 - SVE System Parameters - TCE Concentrations Project No , Art Brass Plating, Seattle, Washington SVE Concentration (ppm TCE) SVE-1 SVE-2 MW-1 MW-2 SVE-A SVE-B SVE-3A SVE-3B SVE-4A SVE-4B Red Zone Flowweighted Average MW-4 SVE-C SVE-D SVE-5A SVE-5B Yellow Zone Flowweighted Average MW-3 MW-5 SVE-E SVE-F Blue Zone Flowweighted Average MW-7 SVE-G SVE-6/7 Green Zone Flowweighted Average 4/27/ /26/ /24/ /27/ /31/ /1/ /27/ /24/ /31/ /28/ /25/ /29/ Combined - Before Treatment NA = Not accessible, no measurement because of equipment blocking access to the monitoring ports. NC = Not calculated due to moisture affecting anemomenter measurements. Values in bold indicate concentrations measured using TCE detection tubes with a detection limit of ppm. Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Tables 4-6_sys mon Table 6 ABP Progress Report Q1 Page 1 of 1

14 Table 7 - TCE Mass Removal and Condensate Monitoring Project No , Art Brass Plating, Seattle, Washington TCE concentration (1) Period Start Period End Hours of operation per period Cumulative hours of operation Condensate Collected (gallons) Influent (3) (ppmv) After Primary GAC (ppmv) Effluent (ppmv) Average at vapor extraction discharge (mg/m 3 ) Total air discharge volume in scfm (2) Cumulative TCE mass extracted in pounds 3/24/2015 4/27/ /27/2015 5/26/ /26/2015 6/24/ /24/2015 7/27/ /27/2015 8/31/ /31/ /1/ /1/ /27/ /27/ /25/ /24/ /31/ /31/2015 1/28/ /28/2016 2/25/ /25/2016 3/29/ Notes: (1) TCE concentrations measured using detector tubes, unless TO-15 analysis was available. Concentrations shown in italics were measured using TO-15 analysis. (2) Total air discharge volume values are estimated using the vacuum recorded at the blower and the blower curve. (3) Where detector tubes indicated non-detect results for influent TCE concentrations, the previous TO-15 analysis result was assumed. Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Table 7_mass removal Table 7 ABP Progress Report Q1 Page 1 of 1

15 Table 8 - Influent/Effluent Vapor Monitoring Using SUMMA Canisters Project No , Art Brass Plating, Seattle, Washington Media Quarterly Treatment System Influent Air (ppbv) Sample Date 4/27/15 5/26/15 6/24/15 7/27/15 9/14/15 10/1/15 10/27/15 11/25/15 12/31/15 1/28/16 2/25/16 3/29/16 4/26/16 Analyte (1) Vinyl Chloride U U U U -- 1,1-Dichloroethene U U U U -- trans-1,2-dichloroethene U U U U -- cis-1,2-dichloroethene U Trichloroethene Tetrachloroethene U U U U -- Media Monthly Treatment System Effluent Air (ppbv) Sample Date 4/27/15 5/26/15 6/24/15 7/27/15 9/14/15 10/1/15 10/27/15 11/25/15 1/8/16 1/28/16 2/25/16 3/29/16 4/26/16 Analyte (1) Vinyl Chloride 1.2 U 1.4 U 1.3 U 1.2 U 1.1 U 1.2 U 1.2 U 1.2 U 1.0 U 1.0 U 1.0 U 0.5 U 0.5 U 1,1-Dichloroethene 1.2 U 1.4 U 1.3 U 1.2 U 1.1 U 1.2 U 1.2 U 1.2 U 1.0 U 1.0 U 1.0 U 0.5 U 0.5 U trans-1,2-dichloroethene 1.2 U 1.4 U U 1.2 U 1.2 U 1.2 U 1.0 U 1.0 U 1.0 U 0.5 U 0.5 U cis-1,2-dichloroethene Trichloroethene Tetrachloroethene 1.2 U 1.4 U 1.3 U 1.2 U 1.1 U 1.2 U 1.2 U 1.2 U 1.0 U 1.0 U 1.0 U U Notes: (1) Analyte list based on the the chemicals of concern for the site as defined in the Remedial Investigation Work Plan (Aspect, September 2008). -- not applicable or not analyzed U = not detected at indicated reporting limit Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Table 8_inf-eff vapor Table 8 ABP Progress Report Q1 Page 1 of 1

16 Table 9 - Soil Vapor Migration Monitoring - Pressure (inches of water column) Project No , Art Brass Plating, Seattle, Washington Date 220F-SS1 220F-SS2 ABP-SS1 Operational Notes 4/27/2015 < /26/2015 < /24/2015 < /27/2015 < /31/2015 < /1/2015 < /27/2015 < /25/2015 < /31/2015 < /28/2016 < /25/2016 < /29/2016 < Notes: (1) Vapor pressure measured using a micro-manometer, negative pressure indicates vacuum. Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Tables 9-10_vapor migration Table 9 ABP Progress Report Q1 Page 1 of 1

17 Table 10 - Soil Vapor Migration Monitoring - TCE Concentration (parts per million) Project No , Art Brass Plating, Seattle, Washington Date 220F-SS1 220F-SS2 ABP-SS1 4/27/2015 <0.125 < /26/2015 <0.125 < /24/2015 <0.125 < /27/2015 <0.125 < /31/2015 <0.125 < /1/2015 <0.125 < /27/2015 <0.125 < /25/2015 <0.125 < /31/2015 <0.125 < /28/2016 <0.125 < /25/2016 <0.125 < /29/2016 <0.125 <0.125 Notes: (1) Sampling conducted with low-level TCE detector tu (2) Shaded cells indicate that monitoring was not requi Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Tables\Tables 9-10_vapor migration Table 10 ABP Progress Report Q1 Page 1 of 1

18 FIGURES

19 MW CI-MW-03 Art Brass Plating Network Wells Network Wells Monitored by Others TCE Isoconcentration Lines Groundwater Cleanup Level Protective of Surface Water Quality Water Table Interval (18 µg/l) Shallow Interval (30 µg/l) Intermediate Interval (30 µg/l) DUWAMISH WATERWAY PSC-CG OHIO @A PSC-CG MW-24 S FIDALGO ST MW PSC-CG E MARGINAL WAY S (HWY PSC-CG PSC-CG-143-WT MW MW MW @A@A MW AB-CG MW PSC-CG PSC-CG PSC-CG-141-WT CI ST AVE S S BRANDON ST S LUCILE ST S FINDLAY ST PZ-01 MW MW S MEAD ST S FIDALGO ST PSC-CG PSC-CG PSC-CG-138-WT MW MW CI-MW-03 MW-16 MW BDC-11-WT 2ND AVE S MW-01 MW-05 MW PMW-01 MW @A@A MW-07 MW-02 MW-04 MW-14 MW S ORCAS PSC-CG BDC BDC PSC-CG-137-WT PSC-CG PSC-CG CI-09-WT MW-11 MW BDC-04-WT BDC BDC-03-WT BDC CI-MW CI-MW-01-WT CI-MW CI-MW-07 CI PSC-CG CI TH AVE S @A CI-MW-08 CI PSC-CG-130-WT PSC-CG PSC-CG PSC-CG PSC-CG-131-WT PSC-CG PSC-CG-134-WT 5TH S FIDALGO ST GIS Path: T:\projects_8\Artbrass\RI_Workplan\Delivered\Progress_Reports\May2016\Fig 1 MW Loc Plan.mxd Coordinate System: NAD 1983 StatePlane Washington North FIPS 4601 Feet Date Saved: 5/5/2016 User: pwittman Print Date: 5/5/ MW MW CI-12-WT CI CI-14-WT CI Monitoring Well Location Plan Art Brass Plating RI Quarter Progress Report Seattle, C O N SU LTI N G MAY-2016 PROJECT NO BY: PPW REV BY: FIGURE NO. 1

20 GIS Path: T:\projects_8\Artbrass\RI_Workplan\Delivered\Progress_Reports\May2016\Fig 2 PCE in Groundwater - SW Protection.mxd Coordinate System: NAD 1983 StatePlane Washington North FIPS 4601 Feet Date Saved: 5/5/2016 User: pwittman Print Date: 5/5/2016 DUWAMISH WATERWAY DUWAMISH WATERWAY DUWAMISH WATERWAY Groundwater Sample Locations: Well Geoprobe? Well without data for analyte/interval Sample Location Symbol Color: $% Detected at > 10x CUL OHIO AVE S OHIO AVE S OHIO AVE S S FIDALGO ST E MARGINAL WAY S (HWY 99) 6.5 Site Unit S FIDALGO ST S FIDALGO ST 5.5 $% Detected Above CUL $% Detected Below CUL $% Not Detected (Reporting Limit Above CUL) $% Not Detected Site Unit 2 E MARGINAL WAY S (HWY 99) 6.5 Site Unit Site Unit 2 E MARGINAL WAY S (HWY 99) 6.5 Site Unit Site Unit ART BRASS PLATING 8.0 BLASER DIE CASTING!? CAPITAL INDUSTRIES!? 1ST AVE S 1ST AVE S S LUCILE ST 2ND AVE S 8.0 S ORCAS ST S FIDALGO ST!?!? 9.0!? 8.5 1ST AVE S 8.0 Geoprobe data shown on this map reflects the maximum concentration detected at that sample location in the given interval. Well data shown on this map reflects the most recent sample collected at that well in the given interval. Well locations with CUL exceedances are labeled with the most recent concentration: 55 S LUCILE ST 2ND AVE S!? 8.5 Tetrachloroethene (PCE) Concentration (in µg/l) S LUCILE ST 2ND AVE S S ORCAS ST S FIDALGO ST !? S ORCAS ST!? S FIDALGO ST !? 4TH AVE S S LUCILE ST S FINDLAY ST S MEAD ST Half-foot Groundwater Elevation Contours from August, 2012 Site-Wide Monitoring Event (NAVD88 Vertical Datum) 4TH AVE S 4TH AVE S!? S LUCILE ST 5TH AVE S S FIDALGO ST!? 6TH AVE S ART BRASS PLATING S FINDLAY ST BLASER DIE CASTING S MEAD ST 5TH AVE S S FIDALGO ST CAPITAL INDUSTRIES S LUCILE ST 6TH AVE S ART BRASS PLATING S FINDLAY ST BLASER DIE CASTING S MEAD ST S FIDALGO ST The Groundwater Cleanup Level (CUL) Protective of Surface Water Quality for Tetrachloroethene (PCE) is 3.3 µg/l. 5TH AVE S CAPITAL INDUSTRIES!? 6TH AVE S!? C O N SU LTI N G 7TH AVE S MAY-2016 PROJECT NO K ,200 7TH AVE S Feet K ,200!?!? 7TH AVE S Feet K ,200 Feet Tetrachloroethene (PCE) Occurrence in Groundwater Art Brass Plating RI Quarter Progress Report Seattle, Washington!? BY: PPW REV BY: WAT E R TA B L E I N T E RVA L S H A L LOW I N T E RVA L I N T E R M E D I AT E I N T E RVA L FIGURE NO. 2

21 GIS Path: T:\projects_8\Artbrass\RI_Workplan\Delivered\Progress_Reports\May2016\Fig 3 TCE in Groundwater - SW Protection.mxd Coordinate System: NAD 1983 StatePlane Washington North FIPS 4601 Feet Date Saved: 5/5/2016 User: pwittman Print Date: 5/5/2016 DUWAMISH WATERWAY DUWAMISH WATERWAY DUWAMISH WATERWAY OHIO AVE S OHIO AVE S OHIO AVE S S FIDALGO ST S FIDALGO ST S FIDALGO ST E MARGINAL WAY S (HWY 99) 6.5 Site Unit 1 21 Site Unit 2 E MARGINAL WAY S (HWY 99) 6.5 Site Unit Site Unit 2 E MARGINAL WAY S (HWY 99) 6.5 Site Unit ART BRASS PLATING BLASER DIE CASTING !? 12 CAPITAL INDUSTRIES Site Unit !? ST AVE S 1ST AVE S S LUCILE ST 2ND AVE S S ORCAS ST S FIDALGO ST!? S LUCILE ST 26 2ND AVE S 530!? S ORCAS ST S FIDALGO ST 30!?!? 8.0!?!? 4TH AVE S !? 4TH AVE S!? S LUCILE ST S FINDLAY ST S MEAD ST S LUCILE ST 5TH AVE S S FIDALGO ST!? 6TH AVE S ART BRASS PLATING S FINDLAY ST BLASER DIE CASTING S MEAD ST 5TH AVE S S FIDALGO ST CAPITAL INDUSTRIES 6TH AVE S ART BRASS PLATING BLASER DIE CASTING CAPITAL INDUSTRIES Groundwater Sample Locations: Geoprobe data shown on this map Half-foot Groundwater Well Geoprobe reflects the maximum concentration Elevation Contours from detected at that sample location in the 8.0? Well without data for analyte/interval given interval. August, 2012 Site-Wide Monitoring Event Sample Location Symbol Color: Well data shown on this map reflects the (NAVD88 Vertical Datum) most recent sample collected at that well $% Detected at > 10x CUL in the given interval. The Groundwater Cleanup Level $% Detected Above CUL Well locations with CUL exceedances are labeled with the most recent (CUL) Protective of Surface concentration: Water Quality for Trichloroethene (TCE) Trichloroethene (TCE) is 18 Concentration (in µg/l) µg/l. $% Detected Below CUL $% Not Detected (Reporting Limit Above CUL) $% Not Detected ST AVE S 8.0 S LUCILE ST 2ND AVE S 9.0 S ORCAS ST 76 S FIDALGO ST 9.5 4TH AVE S S LUCILE ST S FINDLAY ST S MEAD ST 5TH AVE S S FIDALGO ST!? 6TH AVE S!? C O N SU LTI N G 9.3J 12 7TH AVE S MAY-2016 PROJECT NO K ,200 7TH AVE S Feet K ,200!?!? 7TH AVE S Feet K ,200 Feet Trichloroethene (TCE) Occurrence in Groundwater Art Brass Plating RI Quarter Progress Report Seattle, Washington!? BY: PPW REV BY: WAT E R TA B L E I N T E RVA L S H A L LOW I N T E RVA L I N T E R M E D I AT E I N T E RVA L FIGURE NO. 3

22 GIS Path: T:\projects_8\Artbrass\RI_Workplan\Delivered\Progress_Reports\May2016\Fig 4 VC in Groundwater - SW Protection.mxd Coordinate System: NAD 1983 StatePlane Washington North FIPS 4601 Feet Date Saved: 5/5/2016 User: pwittman Print Date: 5/5/2016 DUWAMISH WATERWAY DUWAMISH WATERWAY DUWAMISH WATERWAY Groundwater Sample Locations: Well Geoprobe? Well without data for analyte/interval Sample Location Symbol Color: $% Detected at > 10x CUL OHIO AVE S OHIO AVE S 27 OHIO AVE S S FIDALGO ST S FIDALGO ST S FIDALGO ST 5.5 $% Detected Above CUL $% Detected Below CUL $% Not Detected (Reporting Limit Above CUL) $% Not Detected 6.0 E MARGINAL WAY S (HWY 99) 6.5 Site Unit 1 42 Site Unit 2 E MARGINAL WAY S (HWY 99) 6.5 Site Unit Site Unit 2 E MARGINAL WAY S (HWY 99) 6.5 Site Unit Site Unit ST AVE S !? S LUCILE ST 8.5 2ND AVE S S ORCAS ST S FIDALGO ST J !? J!? !?!? ST AVE S S LUCILE ST 2ND AVE S 3.7Q 7.7!? S ORCAS ST S FIDALGO ST !? ST AVE S Geoprobe data shown on this map reflects the maximum concentration detected at that sample location in the given interval. Well data shown on this map reflects the most recent sample collected at that well in the given interval. Well locations with CUL exceedances are labeled with the most recent concentration: Vinyl chloride Concentration (in µg/l) S LUCILE ST 2ND AVE S 3.1 S ORCAS ST 1.9!? S FIDALGO ST 9.5!? 4.4 4TH AVE S 4TH AVE S 4TH AVE S!? S LUCILE ST ART BRASS PLATING S FINDLAY ST BLASER DIE CASTING S MEAD ST 5TH AVE S S FIDALGO ST CAPITAL INDUSTRIES S LUCILE ST!? 7 6TH AVE S ART BRASS PLATING S FINDLAY ST BLASER DIE CASTING S MEAD ST 5TH AVE S S FIDALGO ST CAPITAL INDUSTRIES S LUCILE ST 6TH AVE S ART BRASS PLATING S FINDLAY ST BLASER DIE CASTING S MEAD ST Half-foot Groundwater Elevation Contours from August, 2012 Site-Wide Monitoring Event (NAVD88 Vertical Datum) S FIDALGO ST The Groundwater Cleanup Level (CUL) Protective of Surface Water Quality for Vinyl chloride is 2.4 µg/l. 5TH AVE S CAPITAL INDUSTRIES 3.4!? 6TH AVE S!? C O N SU LTI N G 3J 7TH AVE S J K ,200 Vinyl Chloride Occurrence in Groundwater Art Brass Plating RI Quarter Progress Report Seattle, Washington MAY-2016 PROJECT NO TH AVE S Feet K ,200!?!? TH AVE S Feet 2.1 K ,200 Feet !? BY: PPW REV BY: WAT E R TA B L E I N T E RVA L S H A L LOW I N T E RVA L I N T E R M E D I AT E I N T E RVA L FIGURE NO. 4

23 Air sparge system off (Dec 2011 Air sparge system off (Aug 2013 Air sparge system off (Oct 2014 April 2015) Air sparge system off (Oct 2015 Present) Concentration (ug/l) PMW 1 MW 1 MW 2 MW 3 MW 4 1 Date Aspect Consulting 6/10/2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\Fig 5 Figure 5 TCE Trends in Source Area Monitoring Wells ABP Progress Report Q1 Art Brass Plating, Seattle, WA

24 APPENDIX A Data Validation Report and Laboratory Certificates of Analysis

25 DATA VALIDATION REPORT Art Brass Plating Groundwater Testing March 2016 SDG AYE2 Prepared by: Aspect Consulting, LLC 401 Second Ave South, Suite 201 Seattle, WA Project No April 18, 2016 V:\ Art Brass Plating\Progress Reports\2016 Q1\AppA-DV and Lab Certs\DV Report - March2016GW.docx

26 1 Introduction This report summarizes the findings of the United States Environmental Protection Agency (USEPA) Stage 2A data validation performed on analytical data for the groundwater samples collected on March 22-23, 2016 for Art Brass sampling. This data quality review was performed by a validator in a different organizational unit of Aspect Consulting than those who make use of the Art Brass Plating data for site decisions. The validator works independently, with no interference from those who collect and use the Art Brass Plating site data. This data quality review is divided into sections by sample delivery group (SDG). A complete list of samples and analyses for each SDG is provided in the Sample Index at the beginning of each section. Samples were analyzed for select VOCs by Analytical Resources, Inc. (ARI). The analytical methods are summarized below: Analysis Method Laboratory VOC SW 8260C ARI The validation followed the procedures documented in the analytical methods, the Quality Assurance Project Plan (QAPP; in Appendix A to Aspect, 2013), National Functional Guidelines for Organic Data Review (USEPA, 1999), and National Functional Guidelines for Inorganic Data Review (USEPA, 2004). Data assigned a J qualifier (estimated) may be used for site evaluation purposes but the reasons for qualification should be taken into account when interpreting sample concentrations. Data marked as do-not-report (DNR) should not be used under any circumstances. Values without qualification meet all data measurement quality objectives and are suitable for use. Data qualifier definitions and a summary table of the qualified data are included in the Qualified Data Summary at the end of this report. Data qualifiers have been incorporated into the project chemistry database to reflect the validation in this report.

27 2 Data Validation Findings for SDG AYE2 Groundwater samples in this SDG, and the chemical analyses performed on them, are tabulated below. The sections below describe the results of the data quality review by analyte group (analysis). Sample Index Analysis Sample ID Date Type Matrix VOCs MW /22/2016 N GrWtr X MW /22/2016 N GrWtr X MW /23/2016 N GrWtr X MW /23/2016 N GrWtr X MW /23/2016 N GrWtr X MW /23/2016 N GrWtr X MW /23/2016 N GrWtr X MW /23/2016 N GrWtr X MW /22/2016 N GrWtr X MW /23/2016 N GrWtr X MW /23/2016 N GrWtr X MW /22/2016 N GrWtr X MW /22/2016 N GrWtr X MW D 3/22/2016 FD GrWtr X MW /22/2016 N GrWtr X MW /22/2016 N GrWtr X MW D 3/22/2016 FD GrWtr X PMW /22/2016 N GrWtr X PSC-CG /23/2016 N GrWtr X 2.1 VOCs (SW 8260C) Sample Receipt, Preservation, and Holding Times Sample receipt, and preservation were acceptable. Some samples were received at approximately 6.9 C, which is higher than desirable. Samples were analyzed within the requisite holding time limit

28 2.1.2 Method Blanks/Detection Levels Target analytes were not detected at or above the reporting levels in the method blank. No qualification or action was needed Trip Blank Target analytes were not detected at or above the reporting levels in the trip blank. No qualification or action was needed Dilutions and Reanalyses Some results exceeded the calibration range for the analysis and had to be reanalyzed at dilution. The results that exceeded the linear range were flagged as do-not-report (R). Results for all other analytes in the dilutions were flagged do-not-report in favor of the lower dilution results Laboratory Control Samples/Laboratory Control Sample Duplicates (LCS/LCSD) All LCS and LCSD %R and RPD were within the laboratory specified control limits. No qualification or action was needed Surrogates All surrogate %R values were within laboratory specified control limit. No qualification or action was needed Matrix Spike/Matrix Spike Duplicate (MS/MSD) All MS and MSD %R and RPD were within the laboratory specified control limits. No qualification or action was needed Field Duplicate (FD) Two Field Duplicates were collected and analyzed as part of this sample set. All FD RPD were within the specified control limits. No qualification or action was needed Case Narrative/Laboratory Qualification The lab indicated that results from 3/25/2016 had been bracketed by CCAL standards that did not meet control criteria for 1,2-dichloroethane. Associated sample results for 1,2- dichloroethane have been qualified as estimated (J/UJ).

29 Overall Assessment Accuracy was acceptable based on the LCS/LCSD and MS/MSD. Precision was acceptable based on the LCS/LCSD RPD values, MS/MSD RPD and Field Duplicate RPD. The data are acceptable for use as qualified.

30 3 Qualified Data Summary Qualified sample results are listed below. This list does not include non-detected values simply qualified U. This list also does not include results that were rejected in favor of a lower dilution. Sample Qualified Sample Results MW MW MW MW MW MW D PMW Analyte Dilution Factor Qualifier 1,2-Dichloroethane (EDC) 5 UJ 1,2-Dichloroethane (EDC) 1 UJ Trichloroethene (TCE) 1 R cis-1,2- Dichloroethene (DCE) 1 R 1,2-Dichloroethane (EDC) 1 UJ cis-1,2- Dichloroethene (DCE) 1 R Trichloroethene (TCE) 1 R 1,2-Dichloroethane (EDC) 1 UJ 1,2-Dichloroethane (EDC) 1 UJ 1,2-Dichloroethane (EDC) 5 UJ cis-1,2- Dichloroethene (DCE) 5 R Trichloroethene (TCE) 5 R Qualification Reason CCAL %D out on QC bracketing this batch. CCAL %D out on QC bracketing this batch. Exceeded instrument calibration range. Exceeded instrument calibration range. CCAL %D out on QC bracketing this batch. Exceeded instrument calibration range. Exceeded instrument calibration range and saturated detector. CCAL %D out on QC bracketing this batch. CCAL %D out on QC bracketing this batch. CCAL %D out on QC bracketing this batch. Exceeded instrument calibration range. Exceeded instrument calibration range. Data Qualifier Definitions Data Qualifier J R U UJ Definition The analyte was detected above the reported quantitation limit, and the reported concentration was an estimated value. The sample results are unusable due to the quality of the data generated because certain criteria were not met. The analyte may or may not be present in the sample. The analyte was analyzed for, but was considered not detected at the reporting limit or reported value. The analyte was analyzed for, and the associated quantitation limit was an estimated value.

31 4 References Aspect, 2013, Work Plan for Remedial Investigation/Feasibility Study, Kimberly- Clark Worldwide Site Upland Area, Everett, Washington, November 22, U.S. Environmental Protection Agency (USEPA), 1994, Method Determination of Trace Elements in Waters and Wastes by Inductively Coupled Plasma Mass Spectrometry, Revision 5.4, Environmental Monitoring Systems Laboratory Office of Research and Development. U.S. Environmental Protection Agency (USEPA), 1997, Method 1640 Determination of Trace Elements in Waters by Preconcentration and Inductively Coupled Plasma Mass Spectrometry, Office of Water & Office of Science and Technology Engineering and Analysis Division (4303), April. U.S. Environmental Protection Agency (USEPA), 1999, Contract Laboratory Program National Functional Guidelines for Inorganic Data Review, Office of Emergency and Remedial Response, USEPA Publication No. 540/R 99/008, October. U.S. Environmental Protection Agency (USEPA), 2004, Contract Laboratory Program National Functional Guidelines for Organic Methods Data Review, Office of Superfund Remediation and Technology Innovation (OSRTI), USEPA Publication No. 540 R , October.

82 APPENDIX B VI Mitigation System Inspection Form using March 2016 Groundwater Quality Results