Loading...
HomeMy WebLinkAboutRS_ER_Focused_Site_Characterization_Report_191916_v1Focused Site Characterization Report Bryant Motors 1300 Bronson Way North Renton, Washington for Bryant Motors May 9, 2019 Focused Site Characterization Report Bryant Motors 1300 Bronson Way North Renton, Washington for Bryant Motors May 9, 2019 17425 NE Union Hill Road, Suite 250 Redmond, Washington 425.861.6000 May 9, 2019 | Page i File No. 21948-001-01 Table of Contents 1.0 INTRODUCTION ................................................................................................................................. 1 2.0 PURPOSE AND SCOPE ...................................................................................................................... 1 3.0 SOIL CHARACTERIZATION SUMMARY ............................................................................................ 2 3.1. Soil Chemical Analytical Results .................................................................................................. 2 3.2. Groundwater Chemical Analytical Results................................................................................... 3 3.3. Investigation-Derived Waste ........................................................................................................ 3 4.0 LIMITATIONS ..................................................................................................................................... 3 LIST OF TABLES Table 1. Soil Chemical Analytical Data Table 2. Groundwater Chemical Analytical Data LIST OF FIGURES Figure 1. Vicinity Map Figure 2. Site Plan with Soil Sample Results Figure 3. Site Plan with Groundwater Sample Results APPENDICES Appendix A. Field Procedures and Boring Logs Figure A-1. Key to Exploration Logs Figure A-2 through Figure A-3. Boring with Monitoring Well Logs Appendix B. Chemical Analytical Program and Data Appendix C. Report Limitations and Guidelines for Use May 9, 2019 | Page 1 File No. 21948-001-01 1.0 INTRODUCTION This report summarizes the results of a subsurface investigation conducted at the property of Bryant Motors in Renton, Washington. Bryant Motors (Site) is bounded by North 2nd Street to the north, an alley to the east, Bronson Way North to the south and Garden Avenue North to the west. Previous site characterization and analysis of soil and groundwater conducted by TerraCon in 2018 identified gasoline-range hydrocarbons in soil and groundwater samples at concentrations greater than the Model Toxics Control Act (MTCA) Method A cleanup levels at two boring locations within the southwest portion of the property. This focused soil and groundwater characterization was conducted to evaluate and document potential impacts to soil and groundwater related to gasoline contamination identified during the previous investigation conducted by TerraCon. The Site location is shown relative to surrounding physical features on the Vicinity Map, Figure 1. The site plan showing the exploration and sample locations is presented in Figures 2 and 3. 2.0 PURPOSE AND SCOPE The purpose of our services was to provide Bryant Motors with sampling and analysis of soil and groundwater at the Site. Two soil characterization explorations were completed in March 2019 to evaluate the subsurface conditions and assess potential impacts to soil and groundwater. The explorations consisted of two hollow-stem auger borings (BMW-1 and BMW-2), which were completed as permanent monitoring wells. Our scope of services included: 1. Coordinate site access with the property owner. 2. Mark proposed exploration locations in the field and notify public utilities through the “one-call” system to mark utilities the public right-of-way in the vicinity of the proposed exploration locations. Additionally, subcontract with a private utility locate service to identify underground utilities on the property prior to undertaking subsurface explorations. 3. Observe and document hollow-stem auger borings, BMW-1 and BMW-2, completed by a licensed driller; the hollow-stem auger borings were air knifed to a depth of approximately eight feet below ground surface (bgs) to clear the borings of utilities. Each boring extended to a maximum depth of approximately 32 feet bgs. 4. Obtain discrete soil samples at approximately 2.5-foot depth intervals from the explorations for field screening purposes and potential chemical analysis. 5. Field screen soil samples from the explorations for evidence of petroleum and volatiles using visual, water sheen and headspace vapor screening methods. Visually classify the samples in general accordance with ASTM International (ASTM) D2488 and maintain a detailed log of each exploration. 6. Submit selected soil samples from the borings for chemical analysis based on field screening results and sample depth in relation to known contaminants identified in previous explorations. Soil samples were analyzed for: gasoline-range hydrocarbons by Northwest Method NWTPH-Gx, diesel- and lube oil-range hydrocarbons by Northwest Method NWTPH-Dx, and benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA Method 8021B. 7. Construct permanent 2-inch-diameter monitoring wells in each boring and develop each well May 9, 2019 | Page 2 File No. 21948-001-01 8. Obtain one round of groundwater samples from monitoring wells BMW-1 and BMW-2 (installed by GeoEngineers), and MW-14 (installed by the City of Renton) using low-flow sampling techniques. Submit the groundwater samples for chemical analysis of the following: gasoline-range hydrocarbons by Northwest Method NWTPH-Gx, diesel- and lube oil-range hydrocarbons by Northwest Method NWTPH-Dx, and BTEX by EPA Method 8021B. 9. Present the results of soil and groundwater sampling in a memo report. 3.0 SOIL CHARACTERIZATION SUMMARY The exploration locations were targeted based on our understanding of the previous investigation completed at the Site by TerraCon (2018). A summary of drilling activities, well installation, soil and groundwater sampling, and investigation-derived waste handling is included in this section. Field procedures and boring logs are included in Appendix A. Chemical analytical results for soil and groundwater samples are summarized in Tables 1 and 2, and on Figures 2 and 3, respectively. The lab reports are presented in Appendix B. 3.1. Soil Chemical Analytical Results Hollow-stem auger borings, BMW-1 and BMW-2, were completed as permanent monitoring wells on March 19, 2019 to depths of 32.5 feet bgs. Soil samples were obtained from the borings in 2.5-foot depth intervals using a 2-inch diameter sampler. Samples were screened in the field for the potential presence of volatile organic compounds (VOCs) using a photoionization detector (PID) and petroleum hydrocarbons by water sheen screening methods and were classified visually in general accordance with ASTM D-2488-09, which is described in Figure A-1 (Appendix A). Well logs showing subsurface soil and groundwater conditions at each boring location and well construction details are presented in Appendix A (Figures A-2 through A-3). Four soil samples (BMW-1-18.5, BMW-1-23.5, BMW-1-31.5, and BMW-2-22.5) were collected from the boring explorations and submitted to OnSite Environmental, Inc. (OnSite) in Redmond, Washington for chemical analysis of gasoline-range hydrocarbons by Northwest Method NWTPH-Gx, diesel- and lube oil-range hydrocarbons by Northwest Method NWTPH-Dx, and BTEX by EPA Method 8021B. The samples were kept cool prior to and during transport to the testing laboratory. Standard chain-of-custody procedures were followed in transporting the samples to the testing laboratory. The laboratory analytical results for the soil samples are summarized in Table 1 and on Figure 2. The laboratory reports are presented in Appendix B, and are summarized as follows: ■ Diesel- and lube oil-range hydrocarbons were not detected above laboratory reporting limits in soil samples submitted for chemical analysis. ■ Gasoline-range hydrocarbons were detected at concentrations greater than laboratory reporting limits in two of the four soil samples submitted for chemical analysis (BMW-1-23.5 and BMW-1-31.5). Gasoline-range hydrocarbons were detected in soil sample, BMW-1-23.5, at a concentration of 370 milligram per kilogram (mg/kg), which exceeds the MTCA Method A cleanup level of 100 mg/kg. May 9, 2019 | Page 3 File No. 21948-001-01 ■ Ethylbenzene and xylenes were detected at concentrations less than MTCA Method A cleanup level in soil samples, BMW-1-23.5 and BMW-1-31.5. 3.2. Groundwater Chemical Analytical Results One round of groundwater sampling was completed at monitoring wells BMW-1, BMW-2, and MW-14 on April 2, 2019 utilizing low-flow sampling procedures. Depths to groundwater were measured in the three monitoring wells during the sampling event. Groundwater elevation measurements indicate groundwater elevations are fairly flat across the site. Historic data provided by the City of Renton indicates regional groundwater flows toward the west. Three groundwater samples (BMW-1, BMW-2, and MW-14) were submitted to OnSite in Redmond, Washington for chemical analysis of gasoline-range hydrocarbons by Northwest Method NWTPH-Gx, diesel- and lube oil-range hydrocarbons by Northwest Method NWTPH-Dx, and BTEX by EPA Method 8021B. The samples were kept cool prior to and during transport to the testing laboratory. Standard chain-of-custody procedures were followed in transporting the samples to the testing laboratory. Depth to groundwater, groundwater elevations and groundwater chemical analytical results are summarized in Table 2 and on Figure 3. The laboratory reports are presented in Appendix B, and are summarized as follows: ■ Diesel- and lube oil-range hydrocarbons and BTEX were not detected above laboratory reporting limits in groundwater samples submitted for chemical analysis. ■ Gasoline-range hydrocarbons were detected in groundwater sample, BMW-1, at a concentration of 1,100 micrograms per liter (µg/L), which slightly exceeds the MTCA Method A cleanup level of 1,000 µg/L. 3.3. Investigation-Derived Waste A total of five 55-gallon drums of IDW were generated during well installation and development and are temporarily stored along the westside of the Bryant Motors building (along Garden Avenue). Four of the five drums contain soil cuttings and one drum contains purge and decontamination water. Each of the drums is labeled with waste type and contact information. GeoEngineers will use the results of soil and groundwater chemical analyses for waste characterization and future disposal at a permitted, off-site facility. 4.0 LIMITATIONS We have prepared this report for the exclusive use of Bryant Motors, Inc., their authorized agents and regulatory agencies. This report is not intended for use by others and the information contained herein is not applicable to other sites. No other party may rely on the product of our services unless we agree in advance, and in writing, to such reliance. This is to provide our firm with reasonable protection against open-ended liability claims by third parties with whom there would otherwise be no contractual limits to their actions. May 9, 2019 | Page 4 File No. 21948-001-01 Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted environmental science practices in this area at the time this report was prepared. No warranty or other conditions, express or implied, should be understood. Any electronic form of this document (email, text, table, and/or figure), if provided, and any attachments are only a copy of a master document. The master hard copy is stored by GeoEngineers, Inc. and will serve as the official document of record. Please refer to Appendix C, titled “Report Limitations and Guidelines for Use,” for additional information pertaining to use of this report. TABLES Sheen Screening PID (ppm)B T E X B8-21 05/08/18 21 ----<3.0 <25 --ND ND ND ND B8-22.5 05/08/18 22.5 ----1,200 57 <50 ND ND ND ND B8-23 05/08/18 23 ----37 <25 --ND ND ND ND B19-15.5 07/05/18 15.5 ----76 93 <50 ND ND ND ND B19-17.5 07/05/18 17.5 ----<3.0 <25 <50 ND ND ND ND B19-22 07/05/18 22 ----6 <25 <50 ND ND ND ND B20-15.5 07/05/18 15.5 ----<3.0 <25 <50 ND ND ND ND B20-21.5 07/05/18 21.5 ----40 <25 <50 ND ND ND ND B21-16 07/05/18 16 ----10 <25 <50 ND ND ND ND B21-21.5 07/05/18 21.5 ----220 <25 <50 ND ND ND ND BMW-1-18.5 03/19/19 NS 2.1 <6.6 <30 <60 <0.020 <0.066 <0.066 <0.066 BMW-1-23.5 03/19/19 MS 1528 370 <130 <61 <0.020 <0.081 1.5 0.59 BMW-1-31.5 03/19/19 MS 345 42 <29 <59 <0.020 <0.062 0.16 0.081 BMW-2-22.5 03/19/19 SS 4.7 <5.7 <29 <57 <0.020 <0.057 <0.057 <0.057 100 8 2,000 2,000 0.03 7 6 9 Notes: 1 Chemical analyses by OnSite Environmental in Redmond, Washington. 3 Field screening methods are described in Appendix B. 4 Gasoline-range petroleum hydrocarbons analyzed by Ecology Northwest Method NWTPH-Gx. 5 Diesel- and lube oil-range petroleum hydrocarbons analyzed by Ecology Northwest Method NWTPH-Dx. 8 When benzene is not present, the cleanup level for gasoline-range hydrocarbons is 100 mg/kg. SS = slight sheen, MS = moderate sheen PID = photoionization detector ppm = parts per million mg/kg = milligrams per kilogram B = benzene, T = toluene, E = ethylbenzene, X = xylenes MTCA = Model Toxics Control Act Shaded cells represent analyte concentrations greater than the MTCA Method A cleanup level. A bolded value indicates analyte was detected above laboratory cleanup levels. Sample Identification2 Date Sampled 2 Sample ID = [Boring Number] - [Depth]. Example: BMW-1-18.5 = a soil sample obtained from Bryant Monitoring Well Number 1 at a depth of approximately 18.5 feet below ground surface. Diesel-Range Hydrocarbons5 (mg/kg) Lube Oil-Range Hydrocarbons5 (mg/kg) Terracon's Soil Sampling Results7 GeoEngineers' Soil Sampling Results 6 BTEX analyzed by EPA Method 8021B. 7 Chemical analytical data provided by Terracon as presented in their June 12, 2018 report titled, "Draft Limited Site Investigation, Construction Industry Training Council (CITC) of Washington, Renton Headquarters and Training Facility, 1300 Bronson Way North, Renton, Washington" Sample Depth (feet bgs) Field Screening3 Gasoline-Range Hydrocarbons4 (mg/kg) BTEX6 (mg/kg) MTCA Method A Cleanup Level File Number 21948-001-01 Table 1 Summary of Soil Chemical Analytical Data1 Bryant Motors Site 1300 Bronson Way North Renton, Washington File No. 21948-001-01 Table 1 | May 9, 2019 Page 1 of 1 B T E X B8-W 05/18/18 ----<50 <130 <250 <2.0 <2.0 <2.0 <4.0 B20 07/05/18 ----<50 <130 <250 ND ND <2.0 ND B21 07/05/18 ----1,700 560 <250 ND ND 2.3 ND BMW-1 04/02/19 17.86 20.54 1,100 <0.64 <0.40 <1 <1 <1 <1 BMW-2 04/02/19 18.22 20.54 <100 <0.25 <0.40 <1 <1 <1 <1 MW-14 04/02/19 18.29 20.51 <100 <0.25 <0.40 <1 <1 <1 <1 1,000 500 500 5 1,000 700 1,000 Notes: 1 Chemical analyses by OnSite Environmental in Redmond, Washington. 2 Approximate monitoring well locations shown in Figure 3. 3 Gasoline-range petroleum hydrocarbons analyzed by Ecology Northwest Method NWTPH-Gx. 4 Diesel- and lube oil-range petroleum hydrocarbons analyzed by Ecology Northwest Method NWTPH-Dx. 5 BTEX analyzed by EPA Method 8021B. MTCA = Model Toxics Control Act B = benzene, T = toluene, E = ethylbenzene, X = xylenes µg/L = micrograms per liter. "--" = not analyzed A shaded cell indicates a concentration that exceeds the MTCA Method A cleanup level. A bolded value indicates analyte was detected above laboratory cleanup levels. Depth To Groundwater (ft) Groundwater Elevation (ft) GeoEngineers' Groundwater Sampling Results Terracon's Groundwater Sampling Results 6 Chemical analytical data provided by Terracon as presented in their June 12, 2018 report titled, "Draft Limited Site Investigation, Construction Industry Training Council (CITC) of Washington, Renton Headquarters and Training Facility, 1300 Bronson Way North, Renton, Washington" Gasoline- Range3 (µg/L) Diesel- Range4 (µg/L) MTCA Method A Cleanup Levels BTEX5 (µg/L)Monitoring Well2 Date Sampled Lube Oil- Range4 (µg/L) File Number 21948-001-01 Table 2 Summary of Groundwater Chemical Analytical Data1 Bryant Motors Site 1300 Bronson Way North Renton, Washington File No. 21948-001-01 Table 2 | May 9, 2019 Page 1 of 1 FIGURES µ Vicinity Map Figure 1 Bryant Motors1300 Bronson Way North Renton, WA 2,000 2,0000 Feet Data Sources: ESRI Data & Maps, Street Maps 2005 Notes:1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication.3. It is unlawful to copy or reproduce all or any part thereof, whether for personal use or resale, without permission. Transverse Mercator, Zone 10 N North, North American Datum 1983North arrow oriented to grid northOffice: RedmondPath: \\red\projects\21\21948001\GIS\2194800100_F1_VicinityMap.mxdMap Revised: 8/3/2015 ELSite B8 B20 B21 B19 MW-14 BMW-1 BMW-2 Figure 2 1300 Bronson Way North Renton, Washington Site Plan with Soil Sample Results W E N S Legend \\geoengineers.com\WAN\Projects\21\21948001\CAD\01\Environmental\2194800101_F02_Site Plan with Soil Sample Results.dwg TAB:F02 Date Exported: 05/08/19 - 16:12 by mwoodsNotes: 1.The locations of all features shown are approximate. 2.This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication. Data Source: Aerial from Pictometry dated 2017. Projection: NAD83 Washington State Planes, North Zone, US Foot Feet 020 20 Direct-Push Boring by TerraconB8 Monitoring Well Installed by GeoEngineers in March 2019BMW-1 MW-14 Monitoring Well by City of Renton Brons o n W a y NGarden Ave NBryant Motors 1300 Bronson Way N BMW-2 (mg/kg) Sample Name G D LO B T E X BMW-2-22.5 <5.7 <29 <57 <0.020 <0.057 <0.057 <0.057 MTCA Method A CUL 100 2,000 2,000 0.03 7 6 9 milligrams per kilogrammg/kg = gasoline-range hydrocarbonsG = diesel-range hydrocarbonsD = lube oil-range hydrocarbonsLO = benzeneB = tolueneT = ethylbenzeneE = xylenesX = Model Toxics Control ActMTCA = Cleanup LevelCUL = 1,200 Cell shading indicates a concentration that exceeds the MTCA Method A cleanup level 1,200 Bold cell value indicates analyte was detected above laboratory Reporting level B20 (mg/kg) Sample Name G D LO B T E X B20-15.5 <3.0 <25 <50 ND ND ND ND B20-21.5 40 <25 <50 ND ND ND ND MTCA Method A CUL 100 2,000 2,000 0.03 7 6 9 B19 (mg/kg) Sample Name G D LO B T E X B19-15.5 76 93 <50 ND ND ND ND B19-17.5 <3.0 <25 <50 ND ND ND ND B19-22 6 <25 <50 ND ND ND ND MTCA Method A CUL 100 2,000 2,000 0.03 7 6 9 BMW-1 (mg/kg) Sample Name G D LO B T E X BMW-1-18.5 <6.6 <130 <61 <0.020 <0.066 <0.066 <0.066 BMW-1-23.5 370 <29 <59 <0.020 <0.081 1.5 0.59 BMW-1-31.5 42 <29 <57 <0.020 <0.062 0.16 0.081 MTCA Method A CUL 100 2,000 2,000 0.03 7 6 9 B8 (mg/kg) Sample Name G D LO B T E X B8-21 <3.0 <25 - -ND ND ND ND B8-22.5 1,200 57 <50 ND ND ND ND B8-23 37 <25 - -ND ND ND ND MTCA Method A CUL 100 2,000 2,000 0.03 7 6 9 B21 (mg/kg) Sample Name G D LO B T E X B21-16 10 <25 <50 ND ND ND ND B21-21.5 220 <25 <50 ND ND ND ND MTCA Method A CUL 100 2,000 2,000 0.03 7 6 9 Not Analyzed"- -" = Not DetectedND = B8 B20 B21 B19 MW-14 20.51 BMW-1 20.54 BMW-2 20.54 Figure 3 1300 Bronson Way North Renton, Washington Site Plan with Groundwater Sample Results W E N S Legend \\geoengineers.com\WAN\Projects\21\21948001\CAD\01\Environmental\2194800101_F03_Site Plan with Groundwater Sample Results.dwg TAB:F03 Date Exported: 05/08/19 - 16:15 by mwoodsNotes: 1.The locations of all features shown are approximate. 2.This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and content of electronic files. The master file is stored by GeoEngineers, Inc. and will serve as the official record of this communication. Data Source: Aerial from Pictometry dated 2017. Projection: NAD83 Washington State Planes, North Zone, US Foot Feet 020 20 Boring by TerraconB8 Brons o n W a y NGarden Ave NBryant Motors 1300 Bronson Way N micrograms per Literμg/L = gasoline-range hydrocarbonsG = diesel-range hydrocarbonsD = lube oil-range hydrocarbonsLO = benzeneB = tolueneT = ethylbenzeneE = xylenesX = Model Toxics Control ActMTCA = Cleanup LevelCUL = 1,200 Cell shading indicates a concentration that exceeds the MTCA Method A cleanup level 1,200 Bold cell value indicates analyte was detected above laboratory reporting levelB21 (μg/L) Sample Name G D LO B T E X B21 1,700 560 <250 ND ND 2.3 ND MTCA Method A CUL 1,000 500 500 5 1,000 700 1,000 Not DetectedND = B8-W (μg/L) Sample Name G D LO B T E X B8-W <50 <130 <250 <2.0 <2.0 <2.0 <4.0 MTCA Method A CUL 1,000 500 500 5 1,000 700 1,000 BMW-2 (μg/L) Sample Name G D LO B T E X BMW-2 <100 <0.25 <0.40 <1 <1 <1 <1 MTCA Method A CUL 1,000 500 500 5 1,000 700 1,000 BMW-1 (μg/L) Sample Name G D LO B T E X BMW-1 1,100 <0.64 <0.40 <1 <1 <1 <1 MTCA Method A CUL 1,000 500 500 5 1,000 700 1,000 B20 (μg/L) Sample Name G D LO B T E X B-20 <50 <130 <250 ND ND <2.0 ND MTCA Method A CUL 1,000 500 500 5 1,000 700 1,000 MW-14 (μg/L) Sample Name G D LO B T E X MW-14 <100 <0.25 <0.40 <1 <1 <1 <1 MTCA Method A CUL 1,000 500 500 5 1,000 700 1,000 BMW-1 20.54 DW-14 20.51 Monitoring Well by City of Renton and Groundwater Elevation Monitoring Well Installed by GeoEngineers in March 2019 and Groundwater Elevation General Groundwater Flow Direction based on historic data provided by The City of Renton APPENDICES APPENDIX A Field Procedures and Boring Logs May 9, 2019 | Page A-1 File No. 21948-001-01 APPENDIX A FIELD PROCEDURES AND BORING LOGS Field Screening of Soil Samples Soil samples obtained during drilling were screened in the field for evidence of hydrocarbons. Field screening results can be used as a general guideline to delineate areas of potential petroleum-related contamination in soils. The screening methods used for this project included: (1) visual examination; (2) water sheen screening; and (3) headspace vapor screening with a photoionization detector (PID). Visual screening consists of inspecting the soil for stains indicative of petroleum-related contamination. Visual screening is generally more effective when contamination is related to heavy petroleum hydrocarbons such as motor oil, or when hydrocarbon concentrations are high. Water sheen screening and headspace vapor screening are more sensitive methods that have been effective in detecting contamination at concentrations less than regulatory cleanup levels. Water sheen screening involves placing soil in a pan of distilled water and observing the water surface for signs of sheen. Sheen screening may detect both volatile and nonvolatile petroleum hydrocarbons. Sheen classifications are as follows: No Sheen (NS) No visible sheen on water surface. Slight Sheen (SS) Light, colorless, dull sheen; spread is irregular, not rapid; sheen dissipates rapidly. Moderate Sheen (MS) Light to heavy sheen, may have some color/iridescence; spread is irregular to flowing; few remaining areas of no sheen on water surface. Heavy Sheen (HS) Heavy sheen with color/iridescence; spread is rapid; entire water surface may be covered with sheen. Headspace vapor screening involves placing a soil sample in a plastic sample bag. Air is captured in the bag, and the bag is shaken to expose the soil to the air trapped in the bag. The probe of a PID is inserted into the bag, and the instrument measures the concentration of organic vapor in the air removed from the sample headspace. The PID measures concentrations in parts per million (ppm) and is calibrated to isobutylene. The PID is designed to quantify organic vapor concentrations in the range between 1 and 2,000 ppm. Field screening results are site-specific and vary with soil type, soil moisture content, temperature and type of contaminant. The presence or absence of a sheen does not necessarily indicate the presence or absence of petroleum hydrocarbons in the sample. Soil Sampling A representative from our staff classified the soil encountered in each of the borings. Soil in the explorations was visually classified in general accordance with ASTM International (ASTM) D 2488-00. The boring logs are presented in Figures A-2 through A-3. May 9, 2019 | Page A-2 File No. 21948-001-01 The sampling equipment was decontaminated before each sampling attempt with a Liqui-Nox® solution wash and a distilled water rinse. Soil samples were obtained for field screening and possible chemical analysis. Soil samples obtained during the exploration activities were collected from the sampler with a stainless-steel knife or new gloves. A portion of each sample was placed in laboratory-prepared sample jars for possible chemical analysis. The remaining portion of each sample was used for field screening. Samples from each boring were selected for chemical analysis, based on criteria described in the report above. Samples submitted for chemical analysis are shown on the logs. The soil samples were placed in a cooler with ice for transport to OnSite. Standard chain-of-custody procedures were followed in transporting the soil samples to the laboratory. Monitoring Well Construction and Development Monitoring wells were constructed by a Washington State licensed driller in compliance with State standards. Installation of the monitoring wells was observed by a GeoEngineers field technician, who maintained a detailed log of the materials and depths of the well. Each monitoring well was developed by surging, bailing, and/or pumping with a submersible pump. The objectives of well development are to remove sediment that may have accumulated during well installation, to consolidate the filter pack around the well screen, and to enhance the hydraulic connection between the target zone and the well. Groundwater sampling proceeded in the developed wells no sooner than 48 hours following development. Groundwater Sampling Groundwater samples were obtained using low-flow/low-turbidity sampling techniques to minimize the suspension of sediment in groundwater samples. Low-flow (minimal drawdown) sampling utilizes an in-line water quality measurement device (e.g. flow-through cell) to establish the stabilization over time for several parameters (e.g. pH, specific conductance, salinity, temperature redox, dissolved oxygen and turbidity) on a well-specific basis. Data on pumping rate, drawdown, and volume required for parameter stabilization can be used as a guide for conducting subsequent sampling activities. This method assumes the water within the screened interval is not stagnant, and a small change to the natural flow rate in the screened interval will result in samples with particulates and colloidal material representative of groundwater. Groundwater samples were obtained using a peristaltic pump and new plastic tubing. The intake for the plastic tubing was positioned at a depth of approximately 22.5 feet; the approximate depth at which contamination in soil had been identified. The water samples were transferred in the field to laboratory-prepared sample containers and kept cool during transport to OnSite. The sample containers were filled completely to eliminate headspace in the container. Chain-of-custody procedures were followed in transporting the water samples to the testing laboratory. Investigative and Purge Water Waste Disposal Drill cuttings and decontamination/purge water generated during drilling/groundwater monitoring activities were temporarily stored on site in labeled 55-gallon drums. SYMBOLS TYPICAL DESCRIPTIONS GW GP SW SP SM FINE GRAINED SOILS SILTS AND CLAYS NOTE: Multiple symbols are used to indicate borderline or dual soil classifications MORE THAN 50% RETAINED ON NO. 200 SIEVE MORE THAN 50% PASSING NO. 200 SIEVE GRAVEL AND GRAVELLY SOILS SC LIQUID LIMIT LESS THAN 50 (APPRECIABLE AMOUNT OF FINES) (APPRECIABLE AMOUNT OF FINES) COARSE GRAINED SOILS MAJOR DIVISIONS GRAPH LETTER GM GC ML CL OL SILTS AND CLAYS SANDS WITH FINES SAND AND SANDY SOILS MH CH OH PT (LITTLE OR NO FINES) CLEAN SANDS GRAVELS WITH FINES CLEAN GRAVELS (LITTLE OR NO FINES) WELL-GRADED GRAVELS, GRAVEL -SAND MIXTURES CLAYEY GRAVELS, GRAVEL - SAND -CLAY MIXTURES WELL-GRADED SANDS, GRAVELLYSANDS POORLY-GRADED SANDS, GRAVELLYSAND SILTY SANDS, SAND - SILT MIXTURES CLAYEY SANDS, SAND - CLAYMIXTURES INORGANIC SILTS, ROCK FLOUR,CLAYEY SILTS WITH SLIGHTPLASTICITY INORGANIC CLAYS OF LOW TOMEDIUM PLASTICITY, GRAVELLYCLAYS, SANDY CLAYS, SILTY CLAYS,LEAN CLAYS ORGANIC SILTS AND ORGANIC SILTYCLAYS OF LOW PLASTICITY INORGANIC SILTS, MICACEOUS ORDIATOMACEOUS SILTY SOILS INORGANIC CLAYS OF HIGHPLASTICITY ORGANIC CLAYS AND SILTS OFMEDIUM TO HIGH PLASTICITY PEAT, HUMUS, SWAMP SOILS WITHHIGH ORGANIC CONTENTSHIGHLY ORGANIC SOILS SOIL CLASSIFICATION CHART MORE THAN 50% OF COARSE FRACTION RETAINED ON NO. 4 SIEVE MORE THAN 50% OF COARSE FRACTION PASSING ON NO. 4 SIEVE SILTY GRAVELS, GRAVEL - SAND -SILT MIXTURES POORLY-GRADED GRAVELS,GRAVEL - SAND MIXTURES LIQUID LIMIT GREATER THAN 50 Continuous Coring Bulk or grab Direct-Push Piston Shelby tube Standard Penetration Test (SPT) 2.4-inch I.D. split barrel NOTE: The reader must refer to the discussion in the report text and the logs of explorations for a proper understanding of subsurface conditions. Descriptions on the logs apply only at the specific exploration locations and at the time the explorations were made; they are not warranted to be representative of subsurface conditions at other locations or times. Blowcount is recorded for driven samplers as the number of blows required to advance sampler 12 inches (or distance noted). See exploration log for hammer weight and drop. "P" indicates sampler pushed using the weight of the drill rig. "WOH" indicates sampler pushed using the weight of the hammer. Key to Exploration Logs Figure A-1 Sampler Symbol Descriptions ADDITIONAL MATERIAL SYMBOLS NS SS MS HS SYMBOLS Asphalt Concrete Cement Concrete Crushed Rock/ Quarry Spalls Topsoil GRAPH LETTER AC CC SOD Sod/Forest Duff CR DESCRIPTIONS TYPICAL TS %F %G AL CA CP CS DD DS HA MC MD Mohs OC PM PI PP SA TX UC VS Groundwater Contact Measured groundwater level in exploration, well, or piezometer Measured free product in well or piezometer Graphic Log Contact Distinct contact between soil strata Approximate contact between soil strata Material Description Contact Contact between geologic units Contact between soil of the same geologic unit Laboratory / Field Tests Percent fines Percent gravel Atterberg limits Chemical analysis Laboratory compaction test Consolidation test Dry density Direct shear Hydrometer analysis Moisture content Moisture density Mohs hardness scale Organic content Permeability or hydraulic conductivity Plasticity index Pocket penetrometer Sieve analysis Triaxial compression Unconfined compression Vane shear Sheen Classification No Visible Sheen Slight Sheen Moderate Sheen Heavy Sheen Rev 06/2017 Approximately 2 to 5 inches of asphalt concrete pavement Crushed gravel with sand (loose, dry) Brown fine to coarse sand with gravel (loose, dry) (fill) Brown fine to coarse sand with silt (loose, dry) (fill?) Brown gravel with silt and sand (loose, moist) (native) Brown fine to coarse sand with silt (medium dense, moist to dry) Brown fine to medium gravel with silt and sand (medium dense, wet) (Cobble in sampler, less recovery) Brown fine to coarse sand with gravel (medium dense, wet) Grades to gray Grades to brown Without gravel Brown fine to coarse gravel with sand (dense, wet) 1 2 3 4 BMW-1-18.5 CA 5 6 BMW-1-23.5 CA 7 8 9 BMW-1-31.5 CA 14 14 12 6 14 14 14 14 14 4 10 16 28 29 28 31 36 AC GP SW SW GP-GM SW-SM GP-GM SW GP Concrete surface seal 2-inch Schedule 40 PVC well casing Bentonite seal Colorado sand backfill 2-inch Schedule 40 PVC screen, 0.010-inch slot width 2-inch Schedule 40 PVC end cap 3' 9' 10' 30' 30.05' 32.5' NS NS NS NS MS MS MS MS MS 2.0 <1 6.0 2.1 186.5 1528 338 312 345 Start Drilled 3/19/2019 Hammer Data Date MeasuredHorizontal Datum Vertical Datum Latitude Longitude Drilling Equipment Top of Casing Elevation (ft) Elevation (ft) Groundwater Depth to Water (ft) Notes: Surface Elevation (ft) Logged By CME-75 truck-mounted rig Undetermined 47.484041 -122.200322 WGS84 3/19/2019 17.00 32.5 Drilling Method3/19/2019 End Checked By DrillerTotal Depth (ft) Air knife to 8 feet below ground surface Autohammer 300 (lbs) / 30 (in) Drop KRA Cascade Drilling, Inc.Hollow-stem Auger DOE Well I.D.: BLK-066 A 2-in well was installed on 3/19/2019 to a depth of 30 ft. Note: See Figure A-1 for explanation of symbols. Coordinates Data Source: Horizontal approximated based on NA. Vertical approximated based on NA. Steel surface monument Elevation (feet)Depth (feet)0 5 10 15 20 25 30 FIELD DATA MATERIAL DESCRIPTION Sample NameTestingWater LevelIntervalRecovered (in)Blows/footCollected SampleGraphic LogGroupClassificationSheet 1 of 1Project Number: Project Location: Project: Renton, Washington 21948-001-01 Log of Boring with Monitoring Well BMW-1 Bryant Motors - Bronson Way Figure A-2 Date:4/19/19 Path:P:\21\21948001\GINT\2194800101.GPJ DBLibrary/Library:GEOENGINEERS_DF_STD_US_JUNE_2017.GLB/GEI8_ENVIRONMENTAL_WELLWELL LOG SheenHeadspaceVapor (ppm) Approximately 4 to 6 inches of asphalt concrete pavement Brown silty fine to coarse sand with occasional burnt wood chips (loose, dry) (fill) Brown fine to coarse sand (loose, dry) (fill) Brown fine to coarse sand with silt (loose, dry) (native) Becomes medium dense Becomes moist Becomes wet Brown gravel with sand (medium dense, wet) Brown fine to coarse sand with gravel (medium dense, wet) Grades to gray 1 2 3 4 BMW-2-18.0 5 6 BMW-2-22.5 CA 7 BMW-2-26.0 8 9 18 17 18 16 18 18 16 16 18 9 11 13 18 20 20 21 18 22 AC SM SW SW GP SW Concrete surface seal 2-inch Schedule 40 PVC well casing Bentonite seal 2-inch Schedule 40 PVC screen, 0.010-inch slot width Colorado sand backfill 2-inch Schedule 40 PVC end cap 3' 9' 10' 30' 30.05' 32.5' NS NS NS NS NS SS NS NS NS <1 2.1 <1 <1 2.6 4.7 4.5 4.3 3.4 Start Drilled 3/19/2019 Hammer Data Date MeasuredHorizontal Datum Vertical Datum Latitude Longitude Drilling Equipment Top of Casing Elevation (ft) Elevation (ft) Groundwater Depth to Water (ft) Notes: Surface Elevation (ft) Logged By CME-75 truck-mounted rig Undetermined 47.48392 -122.200318 WGS84 3/19/2019 18.00 32.5 Drilling Method3/19/2019 End Checked By DrillerTotal Depth (ft) Air knife to 8 feet below ground surface Autohammer 300 (lbs) / 30 (in) Drop KRA Cascade Drilling, Inc.Hollow-stem Auger DOE Well I.D.: BLK-067 A 2-in well was installed on 3/19/2019 to a depth of 30 ft. Note: See Figure A-1 for explanation of symbols. Coordinates Data Source: Horizontal approximated based on NA. Vertical approximated based on NA. Steel surface monument Elevation (feet)Depth (feet)0 5 10 15 20 25 30 FIELD DATA MATERIAL DESCRIPTION Sample NameTestingWater LevelIntervalRecovered (in)Blows/footCollected SampleGraphic LogGroupClassificationSheet 1 of 1Project Number: Project Location: Project: Renton, Washington 21948-001-01 Log of Boring with Monitoring Well BMW-2 Bryant Motors - Bronson Way Figure A-3 Date:4/19/19 Path:P:\21\21948001\GINT\2194800101.GPJ DBLibrary/Library:GEOENGINEERS_DF_STD_US_JUNE_2017.GLB/GEI8_ENVIRONMENTAL_WELLWELL LOG SheenHeadspaceVapor (ppm) APPENDIX B Chemical Analytical Program and Data May 9, 2019 | Page B-1 File No. 21948-001-01 APPENDIX B CHEMICAL ANALYTICAL PROGRAM AND DATA Samples Chain-of-custody procedures were followed during the transport of the field samples to the accredited analytical laboratory. The samples were held in cold storage pending extraction and/or analysis. The analytical results and quality control (QC) records are included in this appendix. Analytical Data Review The laboratory maintains an internal quality assurance program as documented in its laboratory quality assurance manual. The laboratory uses a combination of blanks, surrogate recoveries, duplicates, matrix spike recoveries, matrix spike duplicate recoveries, blank spike recoveries and blank spike duplicate recoveries to evaluate the analytical results. The laboratory also uses data quality goals for individual chemicals or groups of chemicals based on the long-term performance of the test methods. The data quality goals were included in the laboratory reports. The laboratory compared each group of samples with the existing data quality goals and noted any exceptions in the laboratory reports. Any data quality exceptions documented by the accredited laboratory were reviewed by GeoEngineers and are addressed in the analytical data review summary section of this appendix. Analytical Data Review Summary Based on our data quality review, it is our opinion that the analytical data are of acceptable quality for their intended use in this report. OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 14648 NE 95th Street, Redmond, WA 98052 • (425) 883-3881 March 27, 2019 Paul Craig GeoEngineers, Inc. 17425 NE Union Hill Road, Suite 250 Redmond, WA 98052 Re: Analytical Data for Project 21948-001-01 Laboratory Reference No. 1903-178 Dear Paul: Enclosed are the analytical results and associated quality control data for samples submitted on March 20, 2019. The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures 2 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: March 27, 2019 Samples Submitted: March 20, 2019 Laboratory Reference: 1903-178 Project: 21948-001-01 Case Narrative Samples were collected on March 19, 2019 and received by the laboratory on March 20, 2019. They were maintained at the laboratory at a temperature of 2oC to 6oC. Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. 3 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: March 27, 2019 Samples Submitted: March 20, 2019 Laboratory Reference: 1903-178 Project: 21948-001-01 ANALYTICAL REPORT FOR SAMPLES Client ID Laboratory ID Matrix Date Sampled Date Received Notes BMW-1-18.5 03-178-01 Soil 3-19-19 3-20-19 BMW-1-23.5 03-178-02 Soil 3-19-19 3-20-19 BMW-1-31.5 03-178-03 Soil 3-19-19 3-20-19 BMW-2-22.5 03-178-05 Soil 3-19-19 3-20-19 4 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: March 27, 2019 Samples Submitted: March 20, 2019 Laboratory Reference: 1903-178 Project: 21948-001-01 GASOLINE RANGE ORGANICS/BTEX NWTPH-Gx/EPA 8021B Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: BMW-1-18.5 Laboratory ID: 03-178-01 Benzene ND 0.020 EPA 8021B 3-22-19 3-25-19 Toluene ND 0.066 EPA 8021B 3-22-19 3-25-19 Ethyl Benzene ND 0.066 EPA 8021B 3-22-19 3-25-19 m,p-Xylene ND 0.066 EPA 8021B 3-22-19 3-25-19 o-Xylene ND 0.066 EPA 8021B 3-22-19 3-25-19 Gasoline ND 6.6 NWTPH-Gx 3-22-19 3-25-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 90 57-129 Client ID: BMW-1-23.5 Laboratory ID: 03-178-02 Benzene ND 0.020 EPA 8021B 3-22-19 3-25-19 Toluene ND 0.081 EPA 8021B 3-22-19 3-25-19 Ethyl Benzene 1.5 0.081 EPA 8021B 3-22-19 3-25-19 m,p-Xylene 0.48 0.081 EPA 8021B 3-22-19 3-25-19 o-Xylene 0.11 0.081 EPA 8021B 3-22-19 3-25-19 Gasoline 370 8.1 NWTPH-Gx 3-22-19 3-25-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 90 57-129 Client ID: BMW-1-31.5 Laboratory ID: 03-178-03 Benzene ND 0.020 EPA 8021B 3-22-19 3-25-19 Toluene ND 0.062 EPA 8021B 3-22-19 3-25-19 Ethyl Benzene 0.16 0.062 EPA 8021B 3-22-19 3-25-19 m,p-Xylene 0.081 0.062 EPA 8021B 3-22-19 3-25-19 o-Xylene ND 0.062 EPA 8021B 3-22-19 3-25-19 Gasoline 42 6.2 NWTPH-Gx 3-22-19 3-25-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 89 57-129 5 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: March 27, 2019 Samples Submitted: March 20, 2019 Laboratory Reference: 1903-178 Project: 21948-001-01 GASOLINE RANGE ORGANICS/BTEX NWTPH-Gx/EPA 8021B Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: BMW-2-22.5 Laboratory ID: 03-178-05 Benzene ND 0.020 EPA 8021B 3-22-19 3-25-19 Toluene ND 0.057 EPA 8021B 3-22-19 3-25-19 Ethyl Benzene ND 0.057 EPA 8021B 3-22-19 3-25-19 m,p-Xylene ND 0.057 EPA 8021B 3-22-19 3-25-19 o-Xylene ND 0.057 EPA 8021B 3-22-19 3-25-19 Gasoline ND 5.7 NWTPH-Gx 3-22-19 3-25-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 89 57-129 6 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: March 27, 2019 Samples Submitted: March 20, 2019 Laboratory Reference: 1903-178 Project: 21948-001-01 DIESEL AND HEAVY OIL RANGE ORGANICS NWTPH-Dx Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: BMW-1-18.5 Laboratory ID: 03-178-01 Diesel Range Organics ND 30 NWTPH-Dx 3-26-19 3-27-19 Lube Oil Range Organics ND 60 NWTPH-Dx 3-26-19 3-27-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 94 50-150 Client ID: BMW-1-23.5 Laboratory ID: 03-178-02 Diesel Range Organics ND 130 NWTPH-Dx 3-26-19 3-27-19 U1,M1 Lube Oil Range Organics ND 61 NWTPH-Dx 3-26-19 3-27-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 93 50-150 Client ID: BMW-1-31.5 Laboratory ID: 03-178-03 Diesel Range Organics ND 29 NWTPH-Dx 3-26-19 3-27-19 Lube Oil Range Organics ND 59 NWTPH-Dx 3-26-19 3-27-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 103 50-150 Client ID: BMW-2-22.5 Laboratory ID: 03-178-05 Diesel Range Organics ND 29 NWTPH-Dx 3-26-19 3-27-19 Lube Oil Range Organics ND 57 NWTPH-Dx 3-26-19 3-27-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 125 50-150 7 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: March 27, 2019 Samples Submitted: March 20, 2019 Laboratory Reference: 1903-178 Project: 21948-001-01 GASOLINE RANGE ORGANICS/BTEX NWTPH-Gx/EPA 8021B QUALITY CONTROL Matrix: Soil Units: mg/kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0322S2 Benzene ND 0.020 EPA 8021B 3-22-19 3-22-19 Toluene ND 0.050 EPA 8021B 3-22-19 3-22-19 Ethyl Benzene ND 0.050 EPA 8021B 3-22-19 3-22-19 m,p-Xylene ND 0.050 EPA 8021B 3-22-19 3-22-19 o-Xylene ND 0.050 EPA 8021B 3-22-19 3-22-19 Gasoline ND 5.0 NWTPH-Gx 3-22-19 3-22-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 105 57-129 Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: 03-203-01 ORIG DUP Benzene ND ND NA NA NA NA NA 30 Toluene ND ND NA NA NA NA NA 30 Ethyl Benzene ND ND NA NA NA NA NA 30 m,p-Xylene ND ND NA NA NA NA NA 30 o-Xylene ND ND NA NA NA NA NA 30 Gasoline ND ND NA NA NA NA NA 30 Surrogate: Fluorobenzene 98 87 57-129 SPIKE BLANKS Laboratory ID: SB0322S1 SB SBD SB SBD SB SBD Benzene 0.944 0.987 1.00 1.00 94 99 69-111 4 10 Toluene 0.927 0.983 1.00 1.00 93 98 70-114 6 11 Ethyl Benzene 0.942 1.01 1.00 1.00 94 101 70-115 7 10 m,p-Xylene 0.982 1.05 1.00 1.00 98 105 72-115 7 10 o-Xylene 0.977 1.03 1.00 1.00 98 103 71-115 5 11 Surrogate: Fluorobenzene 105 109 57-129 8 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: March 27, 2019 Samples Submitted: March 20, 2019 Laboratory Reference: 1903-178 Project: 21948-001-01 DIESEL AND HEAVY OIL RANGE ORGANICS NWTPH-Dx QUALITY CONTROL Matrix: Soil Units: mg/Kg (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0326S2 Diesel Range Organics ND 25 NWTPH-Dx 3-26-19 3-26-19 Lube Oil Range Organics ND 50 NWTPH-Dx 3-26-19 3-26-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 127 50-150 Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: 03-218-05 ORIG DUP Diesel Range ND ND NA NA NA NA NA NA Lube Oil Range ND ND NA NA NA NA NA NA Surrogate: o-Terphenyl 79 89 50-150 9 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: March 27, 2019 Samples Submitted: March 20, 2019 Laboratory Reference: 1903-178 Project: 21948-001-01 % MOISTURE Date Analyzed: 3-20-19 Client ID Lab ID % Moisture BMW-1-18.5 03-178-01 16 BMW-1-23.5 03-178-02 18 BMW-1-31.5 03-178-03 15 BMW-2-22.5 03-178-05 12 10 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-naphthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical ____________. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. 14648 NE 95th Street, Redmond, WA 98052  (425) 883-3881 April 10, 2019 Paul Craig GeoEngineers, Inc. 17425 NE Union Hill Road, Suite 250 Redmond, WA 98052 Re: Analytical Data for Project 21948-001-01 Laboratory Reference No. 1904-019 Dear Paul: Enclosed are the analytical results and associated quality control data for samples submitted on April 2, 2019. The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures 2 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: April 10, 2019 Samples Submitted: April 2, 2019 Laboratory Reference: 1904-019 Project: 21948-001-01 Case Narrative Samples were collected on April 2, 2019 and received by the laboratory on April 2, 2019. They were maintained at the laboratory at a temperature of 2oC to 6oC. Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. 3 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: April 10, 2019 Samples Submitted: April 2, 2019 Laboratory Reference: 1904-019 Project: 21948-001-01 ANALYTICAL REPORT FOR SAMPLES Client ID Laboratory ID Matrix Date Sampled Date Received Notes BMW-1 04-019-01 Water 4-2-19 4-2-19 BMW-2 04-019-02 Water 4-2-19 4-2-19 MW-14 04-019-03 Water 4-2-19 4-2-19 4 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: April 10, 2019 Samples Submitted: April 2, 2019 Laboratory Reference: 1904-019 Project: 21948-001-01 GASOLINE RANGE ORGANICS/BTEX NWTPH-Gx/EPA 8021B Matrix: Water Units: ug/L (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: BMW-1 Laboratory ID: 04-019-01 Benzene ND 1.0 EPA 8021B 4-4-19 4-4-19 Toluene ND 1.0 EPA 8021B 4-4-19 4-4-19 Ethyl Benzene ND 1.0 EPA 8021B 4-4-19 4-4-19 m,p-Xylene ND 1.0 EPA 8021B 4-4-19 4-4-19 o-Xylene ND 1.0 EPA 8021B 4-4-19 4-4-19 Gasoline 1100 100 NWTPH-Gx 4-4-19 4-4-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 82 66-117 Client ID: BMW-2 Laboratory ID: 04-019-02 Benzene ND 1.0 EPA 8021B 4-4-19 4-4-19 Toluene ND 1.0 EPA 8021B 4-4-19 4-4-19 Ethyl Benzene ND 1.0 EPA 8021B 4-4-19 4-4-19 m,p-Xylene ND 1.0 EPA 8021B 4-4-19 4-4-19 o-Xylene ND 1.0 EPA 8021B 4-4-19 4-4-19 Gasoline ND 100 NWTPH-Gx 4-4-19 4-4-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 68 66-117 Client ID: MW-14 Laboratory ID: 04-019-03 Benzene ND 1.0 EPA 8021B 4-4-19 4-4-19 Toluene ND 1.0 EPA 8021B 4-4-19 4-4-19 Ethyl Benzene ND 1.0 EPA 8021B 4-4-19 4-4-19 m,p-Xylene ND 1.0 EPA 8021B 4-4-19 4-4-19 o-Xylene ND 1.0 EPA 8021B 4-4-19 4-4-19 Gasoline ND 100 NWTPH-Gx 4-4-19 4-4-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 73 66-117 5 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: April 10, 2019 Samples Submitted: April 2, 2019 Laboratory Reference: 1904-019 Project: 21948-001-01 DIESEL AND HEAVY OIL RANGE ORGANICS NWTPH-Dx Matrix: Water Units: mg/L (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags Client ID: BMW-1 Laboratory ID: 04-019-01 Diesel Range Organics ND 0.64 NWTPH-Dx 4-4-19 4-5-19 U1,M1 Lube Oil Range Organics ND 0.40 NWTPH-Dx 4-4-19 4-5-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 103 50-150 Client ID: BMW-2 Laboratory ID: 04-019-02 Diesel Range Organics ND 0.25 NWTPH-Dx 4-4-19 4-5-19 Lube Oil Range Organics ND 0.40 NWTPH-Dx 4-4-19 4-5-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 103 50-150 Client ID: MW-14 Laboratory ID: 04-019-03 Diesel Range Organics ND 0.25 NWTPH-Dx 4-4-19 4-5-19 Lube Oil Range Organics ND 0.40 NWTPH-Dx 4-4-19 4-5-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 95 50-150 6 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: April 10, 2019 Samples Submitted: April 2, 2019 Laboratory Reference: 1904-019 Project: 21948-001-01 GASOLINE RANGE ORGANICS/BTEX NWTPH-Gx/EPA 8021B QUALITY CONTROL Matrix: Water Units: ug/L (ppb) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0404W1 Benzene ND 1.0 EPA 8021B 4-4-19 4-4-19 Toluene ND 1.0 EPA 8021B 4-4-19 4-4-19 Ethyl Benzene ND 1.0 EPA 8021B 4-4-19 4-4-19 m,p-Xylene ND 1.0 EPA 8021B 4-4-19 4-4-19 o-Xylene ND 1.0 EPA 8021B 4-4-19 4-4-19 Gasoline ND 100 NWTPH-Gx 4-4-19 4-4-19 Surrogate: Percent Recovery Control Limits Fluorobenzene 72 66-117 Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: 04-015-169 ORIG DUP Benzene ND ND NA NA NA NA NA 30 Toluene ND ND NA NA NA NA NA 30 Ethyl Benzene ND ND NA NA NA NA NA 30 m,p-Xylene ND ND NA NA NA NA NA 30 o-Xylene ND ND NA NA NA NA NA 30 Gasoline ND ND NA NA NA NA NA 30 Surrogate: Fluorobenzene 82 75 66-117 SPIKE BLANKS Laboratory ID: SB0404W1 SB SBD SB SBD SB SBD Benzene 46.4 45.0 50.0 50.0 93 90 82-122 3 11 Toluene 48.5 47.1 50.0 50.0 97 94 83-123 3 12 Ethyl Benzene 49.4 47.8 50.0 50.0 99 96 83-123 3 12 m,p-Xylene 48.2 46.8 50.0 50.0 96 94 83-123 3 12 o-Xylene 48.5 47.1 50.0 50.0 97 94 83-123 3 11 Surrogate: Fluorobenzene 81 80 66-117 7 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Date of Report: April 10, 2019 Samples Submitted: April 2, 2019 Laboratory Reference: 1904-019 Project: 21948-001-01 DIESEL AND HEAVY OIL RANGE ORGANICS NWTPH-Dx QUALITY CONTROL Matrix: Water Units: mg/L (ppm) Date Date Analyte Result PQL Method Prepared Analyzed Flags METHOD BLANK Laboratory ID: MB0404W1 Diesel Range Organics ND 0.25 NWTPH-Dx 4-4-19 4-5-19 Lube Oil Range Organics ND 0.40 NWTPH-Dx 4-4-19 4-5-19 Surrogate: Percent Recovery Control Limits o-Terphenyl 99 50-150 Source Percent Recovery RPD Analyte Result Spike Level Result Recovery Limits RPD Limit Flags DUPLICATE Laboratory ID: 04-019-01 ORIG DUP Diesel Range ND ND NA NA NA NA NA NA U1,M1 Lube Oil Range ND ND NA NA NA NA NA NA Surrogate: o-Terphenyl 103 98 50-150 8 OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881 This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed. Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-naphthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical ____________. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference APPENDIX C Report Limitations and Guidelines for Use May 9, 2019 | Page C-1 File No. 21948-001-01 APPENDIX C REPORT LIMITATIONS AND GUIDELINES FOR USE 1 This Appendix provides information to help you manage your risks with respect to the use of this report. Read These Provisions Closely Some clients, design professionals and contractors may not recognize that the geoscience practices (geotechnical engineering, geology and environmental science) are far less exact than other engineering and natural science disciplines. This lack of understanding can create unrealistic expectations that could lead to disappointments, claims and disputes. GeoEngineers includes these explanatory “limitations” provisions in our reports to help reduce such risks. Please confer with GeoEngineers if you are unclear how these “Report Limitations and Guidelines for Use” apply to your project or site. Environmental Services Are Performed for Specific Purposes, Persons and Projects This report has been prepared for the exclusive use of Bryant Motors, Inc. This report may be provided to regulatory agencies for review. This report is not intended for use by others, and the information contained herein is not applicable to other sites. GeoEngineers structures our services to meet the specific needs of our clients. For example, an environmental site assessment study conducted for a property owner may not fulfill the needs of a prospective purchaser of the same property. Because each environmental study is unique, each environmental report is unique, prepared solely for the specific client and project site. No one except Bryant Motors should rely on this environmental report without first conferring with GeoEngineers. This report should not be applied for any purpose or project except the one originally contemplated. This Environmental Report Is Based on a Unique Set of Project-Specific Factors This report has been prepared for excavation activities at the Bryant Motors Property. GeoEngineers considered a number of unique, project-specific factors when establishing the scope of services for this project and report. Unless GeoEngineers specifically indicates otherwise, do not rely on this report if it was: ■ not prepared for you, ■ not prepared for your project, ■ not prepared for the specific site explored, or ■ completed before important project changes were made. If important changes are made after the date of this report, GeoEngineers should be given the opportunity to review our interpretations and recommendations and provide written modifications or confirmation, as appropriate. 1 Developed based on material provided by ASFE, Professional Firms Practicing in the Geosciences; www.asfe.org. May 9, 2019 | Page C-2 File No. 21948-001-01 Reliance Conditions for Third Parties Our report was prepared for the exclusive use of Bryant Motors. No other party may rely on the product of our services unless we agree in advance to such reliance in writing. This is to provide our firm with reasonable protection against open-ended liability claims by third parties with whom there would otherwise be no contractual limits to their actions. Within the limitations of scope, schedule and budget, our services have been executed in accordance with our Agreement with Bryant Motors and generally accepted environmental practices in this area at the time this report was prepared. Environmental Regulations are Always Evolving Some substances may be present in the site vicinity in quantities or under conditions that may have led, or may lead, to contamination of the subject Site, but are not included in current local, state or federal regulatory definitions of hazardous substances or do not otherwise present current potential liability. GeoEngineers cannot be responsible if the standards for appropriate inquiry, or regulatory definitions of hazardous substance, change or if more stringent environmental standards are developed in the future. Uncertainty May Remain Even After This Cleanup Project is Completed Our interpretation of subsurface conditions in this study is based on field observations and chemical analytical data from widely-spaced sampling locations. It is always possible that contamination exists in areas that were not explored, sampled or analyzed. Subsurface Conditions Can Change This environmental report is based on conditions that existed at the time the remediation was performed. The findings and conclusions of this report may be affected by the passage of time, by manmade events such as construction on or adjacent to the Site, by new releases of hazardous substances, or by natural events such as floods, earthquakes, slope instability or groundwater fluctuations. Always contact GeoEngineers before applying this report to determine if it is still applicable. Soil and Groundwater End Use The cleanup levels referenced in this report are site- and situation-specific. The cleanup levels may not be applicable for other sites or for other on-site uses of the affected media (soil and/or groundwater). Note that hazardous substances may be present in some of the site soil and/or groundwater at detectable concentrations that are less than the referenced cleanup levels. GeoEngineers should be contacted prior to the export of soil or groundwater from the subject Site or future reuse of the affected media on site to evaluate the potential for associated environmental liabilities. We cannot be responsible for potential environmental liability arising out of the future transfer of soil and/or groundwater from the subject Site to another location or its reuse on site in instances that we were not aware of or could not control. Most Environmental Findings are Professional Opinions Our interpretations of subsurface conditions are based on field observations and chemical analytical data from widely spaced sampling locations at the Site. Site exploration identifies subsurface conditions only at those points where subsurface tests are conducted or samples are taken. GeoEngineers reviewed field and laboratory data and then applied our professional judgment to render an opinion about subsurface conditions throughout the Site. Actual subsurface conditions may differ – sometimes significantly – from May 9, 2019 | Page C-3 File No. 21948-001-01 those indicated in this report. Our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. Read These Provisions Closely Some clients, design professionals and contractors may not recognize that the geoscience practices (geotechnical engineering, geology and environmental science) are far less exact than other engineering and natural science disciplines. This lack of understanding can create unrealistic expectations that could lead to disappointments, claims and disputes. GeoEngineers includes these explanatory “limitations” provisions in our reports to help reduce such risks. Please confer with GeoEngineers if you are unclear how these “Report Limitations and Guidelines for Use” apply to your project or site. Geotechnical, Geologic and Geoenvironmental Reports Should Not Be Interchanged The equipment, techniques and personnel used to perform an environmental study differ significantly from those used to perform a geotechnical or geologic study and vice versa. For that reason, a geotechnical engineering or geologic report does not usually relate any environmental findings, conclusions or recommendations; e.g., about the likelihood of encountering underground storage tanks or regulated contaminants. Similarly, environmental reports are not used to address geotechnical or geologic concerns regarding a specific project. Biological Pollutants GeoEngineers’ Scope of Work specifically excludes the investigation, detection, or assessment of the presence of Biological Compounds that are Pollutants in or around any structure. Accordingly, this report includes no interpretations, recommendations, findings, or conclusions for the purpose of detecting, assessing, or abating Biological Pollutants. The term “Biological Pollutants” includes, but is not limited to, molds, fungi, spores, bacteria, and viruses, and/or any of their byproducts.