Report Phase II Environmental Site Assessment

Transcription

1 Submitted to University of Washington Real Estate Submitted by AECOM th Ave Seattle, WA July 22, 2015 Report Phase II Environmental Site Assessment Roberta Moore Property 416 and th Avenue East Seattle, Washington AECOM Job No

2 AECOM Phase II Environmental Site Assessment TOC i Table of Contents 1 Introduction Site Description and Setting Hydrogeologic Setting Previous Investigation Objectives and Scope Methods of Investigation Drilling and Soil/Groundwater Sampling Procedures Sub-Slab Sampling Methods and Procedures Sample Handling, Analytical Methods, and Applicable Cleanup Levels Investigation Findings and Conclusions Subsurface Conditions Analytical Results Soil Former Dry Cleaners/Dyer Works gallon Waste Oil UST Former Automotive Garage Groundwater Soil Gas Conclusions and Recommendations Soil Groundwater Soil Gas Recommendations Soils Groundwater Soil Gas References List of Appendices Appendix A Boring Logs Appendix B Photograph Log Appendix C Laboratory Analytical Reports AECOM July 22/2015

3 AECOM Phase II Environmental Site Assessment TOC ii List of Tables Table 1 Sampling Rationale Table 2 Summary of Soil Analytical Results Table 3 Summary of Groundwater Analytical Results Table 4 Summary of Soil Gas Analytical Results List of Figures Figure 1 Site Location Figure 2 Site Plan and Investigation Locations Figure 3 Detail of Former Auto Garage Area Investigation Figure 4 Soil, Soil Gas and Groundwater Petroleum Hydrocarbon and VOC Results (June 2015) AECOM July 22/2015

4 AECOM Phase II Environmental Site Assessment 1 July 22, 2015 Mr. Gary Eng, Sr. Asset Mgr. UW Real Estate UW Tower, Box Brooklyn Ave NE, 12 th Floor Seattle, Washington Dear Mr. Eng: Report Phase II Environmental Site Assessment Roberta Moore Property 416 and th Ave East Seattle, WA AECOM Job No This report presents the results of the AECOM investigation to assess the potential environmental concerns identified at the Roberta Moore property located at th Avenue East in Seattle, WA. The investigation was performed in conformance with our proposal dated June 5, We trust this report meets your requirements. If you have any questions or require additional information please feel free to contact us. Very truly yours, AECOM Copy: Erin McKeown, UW Environmental Health & Safety David Raubvogel Senior Geologist, LHG AECOM July 22/2015

5 AECOM Phase II Environmental Site Assessment Section Introduction This report presents the results of the AECOM Technical Services, Inc. (AECOM, formerly URS Corporation [URS]) Phase II Environmental Site Assessment (ESA) performed on behalf of University of Washington Real Estate (UW) to evaluate the soil and groundwater conditions at the Roberta Moore property located at 416 and th Avenue East in Seattle, Washington (subject property or site). The scope of work was developed based on the findings of Farallon Consulting, L.L.C. (Farallon) Phase I ESA (Farallon 2015) and was outlined in our proposal dated June 5, The report presents background information regarding the subject property, the purpose and scope of the Phase II ESA, and our findings and conclusions. 1.1 Site Description and Setting The subject property is located at 416 and th Avenue East in the Capitol Hill neighborhood of Seattle, King County, Washington (Figure 1). The property consists of two parcels totaling approximately 0.87-acre. The parcels (Parcel Numbers and ) are developed with a QFC grocery store occupying the southern half of the property, and a two-story mixed use retail and apartment building occupying the northern portion of the property. The property is owned by Roberta Moore (Roberta LLC). The subject property is bounded on the north by East Republican Street; to the east by an alley and single/multiple family residential; on the south by a commercial development; and on the west by 15th Avenue East, followed by commercial businesses (Figure 2). The southern parcel consists of a single-story, approximately 15,840-square-foot masonry building (QFC Supermarket, th Ave East) constructed in 1944 (King County 2015). The building is slab on grade construction with the exception of the southeastern portion which has an approximately 2,156-square-foot basement (Figure 2). The northern half of the subject property is developed with a two-story wood frame mixed use retail and residential building (426 15th Ave East) constructed in The building is 5,400 square feet and has a basement. A parking lot is situated on the south side of the QFC building and a parking area and loading dock is present in northeastern portion of the subject property (Figure 2). Recent property tenants have included a barber and hardware/stationary store on the first floor, and eight apartments on the second floor. The subject property ranges in elevation from approximately 425 to 424 feet above mean sea level (msl) from north to south and from approximately 425 to 421 feet above msl from west to east. The subject property area is sloping to the southeast. Lake Washington is located approximately 7,0 feet east of the subject property (Figure 1). 1.2 Hydrogeologic Setting The site area is underlain by Vashon-age glacial deposits. The site surficial deposits consist of till characterized by silt and silty sand with occasional sand lenses and vertical fractures. The till is underlain by advance outwash deposits which are characterized by well sorted sand and gravels with some silt beds throughout (USGS 2005). Based on the area topography, groundwater flow is inferred to be southerly to southeasterly. Borings completed northwest of the subject property on 15th Avenue East identified grey silt to sandy silt to approximately 25 feet bgs. Geotechnical borings completed south of the subject property near the intersection of East Harrison Street and 15th Avenue East encountered till consisting of dense, to very dense grey silty sand and silt. Groundwater was not reported in these borings which were completed between 10 to 26 feet below ground surface (bgs). 1.3 Previous Investigation A Phase I ESA was conducted in April 2015 (Farallon 2015) for the property owner as part of property due diligence for the potential divestiture of the property to the UW. Farallon identified recognized environmental conditions (RECs) associated with the historic site uses as follows: AECOM July 22/2015

6 AECOM Phase II Environmental Site Assessment Section The 15th Avenue Garage formerly operated an auto repair facility on the northern parcel from approximately 1925 through the mid-1980s. A 500-gallon waste oil underground storage tank (UST) was used by the auto repair facility and was closed in-place in The location and approximate size of the UST was confirmed by a geophysical survey completed as part of the Phase I ESA. The tank is approximately 4 feet wide and 7 feet long, and is located beneath the sidewalk north of the property boundary (Figure 2). A review of Washington Department of Ecology (Ecology) files indicated that the tank was installed in the 1950s; although the UST database report indicated that it was installed in Two historic dry cleaners were identified at the south parcel. Superb Dye Works operated approximately between 1935 and 1955, and was located in the parking lot south of the QFC grocery store. Capitol Hill French Hand Laundry operated approximately between 1935 and 1960, and was located beneath the western portion of the existing QFC building (Figure 2). These historic dry cleaning operations may have used dry cleaning solvents (e.g., petroleum and/or chlorinated solvents). Several historic and current dry cleaners have operated on the west side of East 15th Avenue, across the street from the subject property. Superb Dry Cleaners is presently located across the street from QFC as shown on Figure 2. AECOM July 22/2015

7 AECOM Phase II Environmental Site Assessment Section Objectives and Scope Based on the results of the Phase I ESA, additional assessment was warranted to evaluate if the identified RECs had affected the environmental conditions at the subject property. The objectives of the investigation were as follows: 1) Assess if petroleum releases have occurred at the location of the closed in-place 500-gallon waste oil UST; 2) Assess if historic dry cleaning operations located within the QFC and in the parking lot (Figure 2) have resulted in releases of dry cleaning solvent (e.g., PCE) to the soil and groundwater; and 3) Assess the area of the former auto repair facility in the northeastern portion of the site for gasoline and diesel range petroleum hydrocarbon concentrations as well as volatile organic compounds (VOCs) in the soil and groundwater. To accomplish these objectives, AECOM implemented the following scope of work: Advanced eight direct push Geoprobe borings (SB-1 through SB-8) for collection of soil samples for chemical analysis. Groundwater samples were also collected from borings SB-1, SB-2, SB-5, and SB-7 for analysis. Collected two sub-slab soil gas samples (SG-1 and SG-2) within the basement of the QFC grocery store (Figure 2) in general conformance with Ecology s Vapor Intrusion (VI) sampling guidance (Ecology 2009). Analyzed soil and groundwater samples for VOCs by the US Environmental Protection Agency (EPA) Method 8260B or 8260B-SIM and gasoline- and heavy oil to diesel-range petroleum hydrocarbons by NWTPH-Gasoline extended (Gx) and Diesel extended (Dx), respectively. The soil sample containing the highest concentrations of petroleum hydrocarbons was also analyzed for polychlorinated biphenyls (PCBs) by EPA Method 8082 and toxicity characteristic leaching procedure (TCLP) lead. Groundwater samples were also analyzed for total lead. Sub-slab soil gas Summa canister samples were analyzed for VOCs by EPA Method TO-15. Prepared this report presenting our findings and conclusions regarding the environmental testing conducted by AECOM. AECOM July 22/2015

8 AECOM Phase II Environmental Site Assessment Section Methods of Investigation 3.1 Drilling and Soil/Groundwater Sampling Procedures The rationale for the boring locations is summarized in Table 1. The sub-slab soil gas sampling was performed to assess if historic releases of dry cleaning chemicals may have occurred beneath the building and if there is a potential risk to indoor air from VI associated with the former dry cleaning facility located within the QFC parking lot. Prior to implementing the investigation, the One Call utility notification service was contacted to demark the public utilities to the property boundary. AECOM contracted Applied Professional Services, Inc. (APS) of North Bend, Washington, to complete a utility clearance within the property boundary on June 17, APS located existing utilities on the property and cleared the soil boring locations. Drilling and sampling services were provided by Cascade Drilling of Woodinville, Washington (Cascade), on June 17 and 18, The eight borings were advanced using a hydraulic push probe (GeoProbe ) drilling rig. Cascade also provided a vacuum truck to pothole boring locations SB-4 and SB-5 due to the presence of underground utilities located adjacent to the tank. Subsurface soil samples were collected from the boreholes using the Geoprobe sampling equipment. The soil samples were collected continuously using a 4-foot sampler to the total depth of the boring. Between one to three soil samples were collected from each boring for chemical analysis based on field screening results. Soil samples were visually inspected and logged for lithological description and were field screened for evidence of contamination (e.g., staining, sheen and/or discoloration) and unusual odors (e.g., slight, moderate, or strong petroleum hydrocarbon odors). The soil conditions were recorded on the boring logs provided in Appendix A. Selected photographs of the soil sampling locations are presented in Appendix B. Soil samples for VOC and NWTPH-Gx analysis were collected using a 5-gram (g) EnCore sampler (EPA Method 5035). Soil samples were transferred to appropriate laboratory provided sample containers. Grab groundwater samples were collected for laboratory analysis from boreholes SB-1, SB-2, SB-5, and SB-7 on June 17 and 18, Grab groundwater samples were collected by advancing the Geoprobe sampling equipment to the appropriate target depth and retracting it to expose the temporary screen. The sampler was purged using a peristaltic pump with dedicated polyethylene tubing. Groundwater samples were collected directly from the peristaltic pump discharge into the laboratoryprovided sample containers. All down-hole soil sampling equipment was decontaminated prior to use by washing with a dilute Alconox detergent solution and triple rinsing with tap water. Investigation-derived waste (IDW) was placed in a clearly labeled 55-gallon drum and left onsite pending laboratory analytical results, and subsequent off-site disposal. 3.2 Sub-Slab Sampling Methods and Procedures The sub-slab soil gas samples were collected on June 18, 2015, beneath the QFC basement located in the southeastern portion of the building (Figure 2). At the time of sampling, the weather was overcast and the barometric pressure readings were relatively stable at approximately inches of mercury. The temperature was approximately 66 degrees Fahrenheit ( F). The soil gas samples were analyzed for VOCs by EPA Method TO 15. The sub-slab soil gas sampling was conducted in general conformance with Ecology s: Guidance for Evaluating Soil Vapor Intrusion in Washington State (Ecology 2009) and ITRC s Technical and Regulatory Guidance: Vapor Intrusion Pathway A Practical Guideline (ITRC 2007). Cascade drilled and installed two temporary sampling ports (SG-1 and SG-2). A pneumatic hammer was used to drill a 5/8-inch hole through the floor that was extended approximately 1-inch into the underlying sub-slab soils. The concrete floor within the basement was noted to be in generally good conditions with only minor shrinkage cracking. A dedicated sub-slab soil gas sampling port (Vapor Pin) manufactured by Cox-Colvin & Associates, Inc., was installed in each hole that consisted of a brass barb with a silicon sleeve. Following installation of the Vapor Pins, the sub-slab conditions were allowed to equilibrate for approximately 2 hours prior to sampling. Photographs of the sub-slab sampling locations are provided in Appendix B. AECOM July 22/2015

9 AECOM Phase II Environmental Site Assessment Section Teflon tubing was connected to each sampling port and modeling clay was placed around each Vapor Pin to affect a better surface seal. To reduce the potential of breakthrough from the surface, purging and sampling rates were controlled so as not to exceed 200 ml/min. Leak testing was conducted at each sampling location during purging using a tracer gas (e.g., helium) by pumping helium gas over the sampling apparatus. A portable helium detector was used to monitor the leak tests. If leaks were identified, additional clay was used to improve the surface seal around the sample tubing. The tubing was purged using a hand-operated vacuum pump of between 1.5 to 3 volumes. The purged vapor was captured in a Tedlar bag and screened using a photoionization detector (PID). Low PID readings were noted in the purged soil gas at SG-1 (2.5 ppm) and SG-2 (0.6 ppm). The sub-slab soil gas samples were collected in 6-liter Summa canisters provided by Fremont Analytical. The canisters were pre-evacuated by the laboratory and checked upon receipt to ensure a proper vacuum remained in the canister. The initial and final vacuum readings for each canister were recorded on the chain-of-custody. Following sample collection, the Vapor Pins were removed and the holes in the concrete were patched by filling them with cement. 3.3 Sample Handling, Analytical Methods, and Applicable Cleanup Levels Sample containers for soil and groundwater and the soil gas canisters were labeled with a unique sample identification number. Soil and groundwater samples were placed in a cooler with ice, and submitted to the laboratory for analysis under chain-of-custody protocol. All non-disposable sampling equipment was decontaminated. Quality assurance samples included VOC trip blanks that accompanied each sample shipment. The samples were submitted for analysis to Fremont Analytical, an Ecology-accredited laboratory located in Seattle, Washington. The soil analytical program included: VOCs by EPA Methods 8260B/8260B-SIM, and gasoline-and diesel-range petroleum hydrocarbons by NWTPH-Gx and Dx, respectively. The laboratory analytical reports are provided in Appendix C. An AECOM chemist reviewed all of the analytical data and no data usability issues were identified. The soil and groundwater analytical results are summarized in Tables 2 and 3, along with their respective Ecology Model Toxics Control Act (MTCA) Method A or B cleanup levels. The lowest cleanup level for each compound was used for comparison. The MTCA Method B values were obtained from Ecology s CLARC Database (Ecology 2015). Ecology screening levels for the sub-slab soil gas, which were last updated in April 2015, were used for comparison (Ecology 2015). Sub-slab soil gas results are summarized in Table 4. AECOM July 22/2015

10 AECOM Phase II Environmental Site Assessment Section Investigation Findings and Conclusions 4.1 Subsurface Conditions Based on the soil borings completed at the subject property, the site is underlain by a thin layer of fill material consisting of brown fine to coarse sand with varying amounts of gravel that is less than 4 feet in thickness. The fill is underlain by native till soils characterized by gray silt to sandy silt with minor lenses of fine to medium sand. The silt became denser with depth and refusal conditions were encountered between 20 to 25 feet bgs. Groundwater was encountered during the drilling of borings SB-1 and SB-2 at approximately 19 to 20 feet bgs. Groundwater was not encountered in SB-3 completed approximately 40 feet to the east of these borings. Groundwater was encountered in the northern portion of the subject property at considerably shallower depths. Groundwater was noted during drilling of SB-5, SB-7, and SB-8 between 6 to 8 feet bgs. Measurable saturated conditions were not evident in the soils at SB-4 and SB-6. The soil field screening results are provided on the boring logs in Appendix A. During field screening of soils, PID readings were generally between 1 and 3 parts per million (ppm) in borings SB-1 and SB-2 completed on the south side of the QFC in the area of the former dry cleaners/dye works. SB-3 had PID readings between approximately 4 to 6 ppm. No discoloration or chemical odors were noted in soils at these borings. Elevated PID readings were noted in borings SB-4, SB-5, and SB-8 completed adjacent to, and downgradient of the closed in-place UST (Figure 3). The highest PID readings were evident in SB- 5 at a depth of 15 to 18 feet bgs (390 ppm) and strong to moderate petroleum (gasoline) odors were noted from approximately 7 to 23 feet bgs. Strong to moderate petroleum odors were also noted in borings SB-4 and SB-8. Field screening of soil samples collected from borings SB-6 and SB-7 completed in the footprint of the former auto repair facility did not have elevated PID readings or petroleum odors. 4.2 Analytical Results Soil Selected soil samples from the borings were submitted to the laboratory for chemical analysis and the results are summarized in Table 2 and shown on Figure 4. Boring locations are shown on Figure 2 and Figure 3. The results are presented by the area of concern Former Dry Cleaners/Dyer Works Heavy oil, diesel, or gasoline-range petroleum hydrocarbons were not detected above laboratory detection limits in soil samples collected from borings SB-1, SB-2, and SB-3 (Table 2). Tetrachloroethene (PCE) was detected in soil samples from SB-3 at concentrations of milligrams per kilogram (mg/kg) at 3 to 5 feet bgs, mg/kg at 7 to 10 feet bgs, and mg/kg at 10 to 13 feet bgs. These detections exceeded the MTCA Method A cleanup level of 0.05 mg/kg. The common degradation products of PCE, cis-1, 2-dicloroethene (DCE) and trichloroethene (TCE) were also detected in the soil samples from SB-3. Concentrations of DCE ranged from mg/kg to mg/kg which is below the MTCA Method B cleanup level of 160 mg/kg. TCE was detected at a concentration of mg/kg in SB-3 at 10 to 13 feet bgs, which slightly exceeds the MTCA Method A cleanup level of 0.03 mg/kg. Methylene chloride was detected in soil samples from SB-1, SB-2, and SB- 3. Methylene chloride concentrations ranged from mg/kg (SB-3 from 3 to 5 feet bgs) to mg/kg (SB-1 from 7-9 feet bgs) and exceeded the MTCA Method A cleanup level of 0.02 mg/kg. No other VOCs were detected in the soil samples from these borings gallon Waste Oil UST Borings SB-4 and SB-5 were completed adjacent to the west and east end of the UST, respectively. Diesel and heavy oilrange petroleum hydrocarbons were not detected in the soil samples collected from these borings. Gasoline-range petroleum hydrocarbons were detected in soil samples collected at SB-5 (1420 mg/kg at 7 to 10 feet bgs and 106 mg/kg at 20 to 23 feet bgs). Although field screening evidence of gasoline-contaminated soils was evident in boring SB-4, both soil samples from this boring did not detect gasoline range petroleum hydrocarbons. A total of 10 gasoline related VOCs were detected in soil samples from both SB-4 and SB-5. With the exception of benzene, concentrations of aromatic VOCs were below applicable MTCA cleanup levels. Benzene was detected in only one soil sample, SB-5, from 20 to 23 feet bgs; and the benzene AECOM July 22/2015

11 AECOM Phase II Environmental Site Assessment Section concentrations (0.465 mg/kg) exceeded the MTCA Method A cleanup level of 0.03 mg/kg. Methylene chloride was also detected in this sample (0.465 mg/kg) at a concentration that exceeded the MTCA Method A cleanup level of 0.02 mg/kg. Another boring (SB-8) was completed approximately 18 feet south of the UST to evaluate the lateral extent of the contamination. Boring SB-8 detected gasoline range petroleum hydrocarbons in the sample collected from 7 to 9 feet bgs at a concentration of 184 mg/kg. Aromatic VOCs were also detected in this sample at concentrations below applicable MTCA cleanup levels. The soil sample collected from 13 to 14 feet in this boring did not detect gasoline range petroleum hydrocarbons or VOCs. The soil sample with the highest concentrations of petroleum hydrocarbons (SB-5 from 7 to 10 feet bgs) was also analyzed for PCBs and TCLP lead. Neither PCBs nor lead were detected in the sample Former Automotive Garage Soil borings SB-6 and SB-7 completed within the footprint of the former automotive repair facility did not detect petroleum hydrocarbons and with the exception of methylene chloride, VOCs were not detected in the soil samples from these borings. Methylene chloride was detected in the sample from SB-7 at a concentration of mg/kg, which exceeds the MTCA Method A cleanup level of 0.02 mg/kg Groundwater Groundwater grab samples were collected from borings SB-1 and SB-2 within the former drycleaner area and from SB-5 and SB-7 in the area of the 500-gallon UST and former automotive garage (Figure 2). The analytical results are summarized in Table 3. Petroleum hydrocarbons and VOCs were not detected in the groundwater samples collected from boring SB-1 and SB-2. The groundwater sample collected from SB-5 detected gasoline range petroleum hydrocarbons at a concentration of 1,9 µg/l which exceeds the MTCA Method A cleanup level of 800 µg/l. Eleven (11) petroleum related VOCs were detected in SB-5 at concentrations below applicable cleanup levels. Low concentrations of aromatic VOCs (e.g., benzene, toluene, ethylbenzene, and xylenes [BTEX]) were detected in SB-5. One chlorinated VOC, vinyl chloride, was detected in SB-5 at a concentration of 1.69 µg/l which exceeds the MTCA Method A cleanup level of 0.2 µg/l. The groundwater sample collected from SB-7 did not detect either petroleum hydrocarbons or VOCs. Total lead concentrations in the groundwater samples ranged from 8.96 µg/l (SB-2) to 14.6 µg/l (SB-5) which are below the MTCA Method A cleanup level of 15 µg/l Soil Gas The results of the sub-slab soil vapor samples SG-1 and SG-2 collected within the basement beneath the southeastern portion of the QFC building are summarized in Table 4. Consistent with Ecology s guidance for evaluating soil VI (Ecology 2009), AECOM compared soil vapor analytical results to the updated MTCA Method B sub-slab vapor screening levels (Ecology 2015). Seven VOCs were detected in the sub-slab vapor samples. PCE was detected in both samples at concentrations ranging from 67.5 to 296 micrograms per cubic meter (µg/m 3 ). TCE was detected in SG-2 at a concentration of 5.61 µg/m 3. No other chlorinated VOC was detected in the soil vapor samples. BTEX constituents were detected in the soil gas samples at concentrations below applicable sub-slab vapor screening levels. Naphthalene was detected in SG-1 (12.2 µg/m 3 ) and SG-2 (9.52 µg/m 3 ) at concentrations exceeding the MTCA Method B screening level of 2.45 µg/m Conclusions and Recommendations AECOM has drawn the following conclusions based on the results of the Phase II ESA conducted at the Roberta Moore property Soil The subject property is underlain by thin sandy fill layer (<4 feet thick) that grades into glacial till soils characterized by dense to very dense grey sandy silt to silt. The silt becomes denser with depth and some minor sand lenses were evident. The borings were advanced to depths of between 20 to 25 feet within the silt until refusal conditions were encountered. Field screening of soil samples did not identify evidence of contamination in the borings (SB-1, 2 & 3) completed in the former dry cleaner location in the QFC parking lot. Gasoline affected soils were evident in the two borings (SB-4 and SB-5) completed adjacent to the 500-gallon UST and the boring approximately 18 feet downgradient of the tank (SB-8). AECOM July 22/2015

12 AECOM Phase II Environmental Site Assessment Section Borings SB-1 and SB-2 completed in the western portion of the former dry cleaner (SB-2), did not detect the dry cleaning solvent PCE. PCE was detected at boring SB-3 and the highest concentration of PCE (0.388 mg/kg) was detected in the sample collected from 10 to 13 feet bgs. The common PCE degradation products, DCE and TCE, were also detected in this boring. Concentrations of PCE and TCE exceeded applicable MTCA Method A cleanup levels. Based on these findings, the western extent of PCE in soils appears to have been defined; however, the northern, southern and eastern extents are not known. Methylene chloride was detected in all of the borings (SB-1, 2 & 3) completed within the footprint of the former dry cleaner at concentrations exceeding the MTCA Method A cleanup level of 0.02 mg/kg. The highest concentration (0.151 mg/kg) was noted in boring SB-1 at 3 to 5 feet bgs. Methylene chloride is a common laboratory contaminant, however methylene chloride appears to be a site contaminant based on AECOMs chemist review and subsequent data review by Fremont Analytical. Methylene chloride was also detected in soil samples collected adjacent to the waste oil UST (SB-5) and the former automotive garage area (SB-7). Methylene chloride has been used in the dry cleaning industry as a dry-side precleaning/spotting agent used to remove oily stains and as a carrying agent for applying stain repellents to garments (SCRD 2009). It has also been used in automotive cleaners and solvents. The lateral extent of methylene chloride concentrations within the area of the former drycleaner is not known. Gasoline range petroleum hydrocarbons and gasoline related VOCs (e.g., BTEX) were detected in the soils adjacent to the 500-gallon waste oil UST from approximately 5 feet to 23 feet in depth. Soil samples collected from the east side of the UST detected gasoline range petroleum hydrocarbons and benzene at concentration that exceeded applicable MTCA cleanup levels. The boring completed on the west side of the tank did not detect elevated levels of gasoline range petroleum hydrocarbons or benzene; although, field screening data indicated that gasoline contamination was present in boring SB-4. The gasoline contamination extends at least approximately 18 feet to the south of the UST based on the findings at boring SB- 8. Boring SB-6 completed approximately feet downgradient/south of SB-8 did not detect evidence of gasoline contamination during field screening or chemical testing of soil samples. With the exception of the southern limits, the lateral extent of gasoline affected soils was not defined during this investigation. Considering that diesel and heavy oil range petroleum hydrocarbons were not detected in the soils adjacent to the tank, it appears that this UST may not have been used for waste oil storage Groundwater Groundwater was encountered in the southern portion of the property at borings SB-1 and SB-2 at approximately 20 feet bgs. Groundwater was not encountered at similar depths in SB-3 located approximately 40 feet east of these borings (Figure 2). Based on these findings it appears that the saturated zone is intermittent in this portion of the site. Chlorinated VOCs (including PCE, DCE, TCE, and methylene chloride) were not detected in the groundwater samples collected from SB-1 and SB-2. Thus, chlorinated VOC contamination identified in the soils at SB-3 do not appear to have affected the groundwater quality. Further assessment would be required to confirm if groundwater is present east and southeast (e.g., downgradient) of the former dry cleaner, and if the chlorinated VOCs have migrated vertically and laterally within the groundwater. Borings completed in the northern portion of the property (e.g., in the vicinity of the 500-gallon UST and the former automotive garage) encountered groundwater between 6 to 8 feet in depth. Groundwater collected adjacent to the UST detected gasoline range petroleum hydrocarbon concentrations (1,9 µg/l) exceeding the MTCA Method A cleanup level of 800 µg/l. It is apparent that a historic release(s) from this tank has impacted soils and contamination has migrated into the groundwater table. The petroleum related VOCs detected in the groundwater were generally consistent with those detected in the soil, although benzene was not detected in the groundwater. None of the petroleum related VOC concentrations exceeded applicable cleanup levels. Consistent with the soil data, diesel and heavy oil related petroleum hydrocarbons were not detected in the groundwater adjacent to the tank area. Gasoline range petroleum hydrocarbon contamination within the groundwater has migrated downgradient to the south based on the saturated zone impacts noted at boring SB-8 (Figure 4). This smear zone contamination appears to be limited in extent as contamination was not evident in boring SB-6 and a groundwater sample collected from SB-7 approximately 65 feet south (downgradient) from SB-8 did not detect gasoline range petroleum hydrocarbons in groundwater. With the exception of vinyl chloride, chlorinated VOCs were not detected in the groundwater in the northern portion of the property. Vinyl chloride was detected at a concentration of 1.69 µg/l in boring SB-5, which exceeds the MTCA Method A cleanup level of 0.2 µg/l. Vinyl chloride is a degradation product of TCE and PCE which are commonly used automotive AECOM July 22/2015

13 AECOM Phase II Environmental Site Assessment Section degreasers and part cleaners. It should be noted that vinyl chloride, PCE, and TCE were not detected in soil samples collected in this area Soil Gas Sub-slab soil vapor sampling performed in June 2015 within the basement of the QFC building detected PCE at concentrations ranging from 67.5 µg/m 3 to 296 µg/m 3, which are below the MTCA Method B soil gas screening level of 321 µg/m 3. TCE was also detected in one soil gas sample beneath the building at a concentration below the MTCA Method B soil gas screening level of 12.3 µg/m 3. The levels of PCE and TCE detected beneath the building may be indicative of a source of contamination beneath the building. It is plausible that the PCE/TCE detections in soil gas are associated with the PCE soil contamination identified south of the building at the location of the former cleaners/dye works. Although detected in the soil south of the QFC, methylene chloride was not detected in the soil gas samples. Low concentrations of BTEX were also detected in the sub-slab soil gas samples none of which exceeded applicable screening levels. Naphthalene was detected in both soil gas samples (ranging from 9.52 to 12.2 µg/m 3 ) at concentrations exceeding the MTCA Method B soil gas screening level of 2.45 µg/m 3. BTEX and naphthalene were not detected in soil or groundwater samples collected adjacent to the QFC building. The source of naphthalene is not known but it may be associated with treated wood products (e.g., telephone poles and foundation elements) and/or insecticide use within the project area. The levels of naphthalene detected in the sub-slab vapor samples suggest that a potential VI pathway at the subject property cannot be ruled out at this time Recommendations Soils AECOM understands that there are no current plans regarding redevelopment of the site and based on the findings, no additional soil sampling is suggested at this time. If future development of the site is to include grading for the proposed building foundation or other foundation related earthwork, AECOM would advise that a Construction Contingency/Soil Management Plan (CC/SMP) be prepared to assist in managing potential environmental issues that may be encountered during site development activities (e.g., installation of the shoring system; foundation excavation, installation of utilities, and other activities that will cause a disturbance to soil at the site), in the event that chlorinated VOCs and/or petroleum hydrocarbon contamination are encountered. This CC/SMP would need to address the procedures to be used during the foundation earthwork in areas of the PCE affected soils associated with the former cleaners/dye works and petroleum affected soils in the waste oil UST area Groundwater Further assessment of groundwater in the southern portion of the property should be considered to evaluate if PCE has affected the groundwater quality. Existing data does not indicate groundwater has been affected, but additional sampling would be appropriate south and east of the existing borings to confirm PCE impacts to soil have not affected groundwater. Impacts to the groundwater were identified adjacent to the waste oil UST, thus additional assessment would be required to establish the lateral and vertical extent of the elevated gasoline range petroleum hydrocarbons and vinyl chloride Soil Gas Based on the levels of naphthalene detected in the sub-slab soil gas above applicable Ecology screening levels, there is a potential risk to indoor air quality from VI. AECOM suggests that indoor air sampling be considered to assess if naphthalene or other VOCs have impacted indoor air quality from a vapor intrusion pathway. AECOM July 22/2015

14 AECOM Phase II Environmental Site Assessment References References Farallon Consulting, Phase I Environmental Site Assessment 416 and th Avenue East Seattle, WA (for Century Pacific LLLP). March 10. ITRC, Technical and Regulatory Guidance: Vapor Intrusion Pathway A Practical Guideline. King County Department of Assessments, Online Parcel Data. State Coalition for Remediation of Drycleaners (SCRD), Chemicals Used in Dry cleaning Operations. July. USGS, The Geologic Map of Seattle A Progress Report. Washington State Department of Ecology, MTCA Regulations, Chapter WAC Guidance for Evaluating Soil Vapor Intrusion in Washington State: Investigation and Remedial Action. October CLARC Database. May Updated Vapor Intrusion Screening Levels Spreadsheet. Ecology web site: April 6. AECOM July 22/2015

15 Tables AECOM July 22/2015

16 Table 1 Sample Location Rationale University of Washington - Roberta Moore Property Seattle, WA Boring/Well ID Rationale Media Soil Groundwater Soil Gas Analytical Parameters SG-1 and SG-2 Assess the soil gas conditions beneath the QFC building in the area of the historic "hand laundry" cleaners Shortened list of VOCs (chlorinated and petroleum related solvents) SB-1 through SB-3 Assess soil and gw quality in the parking lot south of the QFC in the footprint of the former dry cleaner NWTPH - Gx & Dx, VOCs * and total lead for groundwater samples SB-4 through SB-8 Assess the soil and gw quality adjacent to the 500 gal. waste oil UST and the historic auto garage. 8 2 NWTPH - Gx & Dx, VOCs Notes: NWTPH-Gx = Northwest Total Petroleum Hydrocarbons Gasoline extended NWTPH-Dx = Northwest Total Petroleum Hydrocarbons Diesel extended VOCs = volatile organic compounds (EPA Method 8260B for soil/groundwater; EPA Method TO-15 soil gas) B = GeoProbe boring; SG = Soil Gas; GW- groundwater; TBD = to be determined * = TCLP Lead and PCBs was run on the soil sample with highest petroleum hydrocarbon concentrations J:\Projects\U\University of Washington\Capitol Hill Properties\Phase II ESA\Deliverables\Tables\Table 1.xls(Summary) URS Corporation

17 Table 2 Summary of Soil Analytical Results University of Washington - Roberta Moore Property Seattle, Washington Sample ID SB-1 SB-2 SB-3 SB-4 1,2,4-Trimethyl benzene 1,3,5-Trimethyl benzene Benzene cis-1,2- Dichloroethene Ethylbenzene Isopropyl benzene Methylene chloride VOCs (mg/kg) Naphthalene n-butyl benzene n-propyl benzene 4-Isopropyl toluene sec-butyl benzene P C E Toluene TCE Xylenes 6/17/ U U U U U U U U U U U U U U U 4.94 U 20.3 U 50.7 U NA NA 6/17/ UJ UJ UJ UJ UJ UJ J UJ UJ UJ UJ UJ UJ UJ UJ UJ NA NA NA NA NA 6/17/ U U U U U U U U U U U U U U U 5.41 U 21.7 U 54.2 U NA NA 6/17/ UJ UJ UJ UJ 0.00 UJ UJ J 0.00 UJ UJ UJ UJ UJ UJ UJ UJ UJ NA NA NA NA NA 6/17/ U U U U U U U U U U U U 5.57 U 21.4 U 53.5 U NA NA 6/17/ U U U U U U U U U U U U U U 6.04 U 23.1 U 57.9 U NA NA 6/17/ UJ UJ UJ J UJ UJ UJ UJ UJ UJ UJ UJ J UJ J UJ NA NA NA NA NA 6/18/ U U U U U U U U U U U U U U U U 4.72 U 20.8 U 52.1 U NA NA 6/18/ U U U U U U U U U U U U U 22.0 U 54.9 U NA NA 6/18/ J 6.59 J U U 1.77 J J U 1.66 J 3.06 J 1.89 J 1.08 J J U J U 5.15 J 1, U 63.0 U UJ U SB-5 6/18/ U U U U U U 58.9 U NA NA SB-6 6/18/ U U U U U U U U U U U U U U U U 6.02 U 24.2 U 60.4 U NA NA SB-7 6/18/ U U U U U U U U U U U U U U U 6.74 U 25.9 U 64.8 U NA NA SB-8 Sample Date Sample Depth (ft bgs) 6/18/ U U U U U U U 54.1 U NA NA 6/18/ U U U U U U U U U U U U U U U U 5.58 U 24.8 U 62.0 U NA NA Gasoline Range TPH (mg/kg) Diesel Range Heavy Oil Range PCBs (mg/kg) Total PCBs TCLP Lead (mg/l) MTCA Method A Soil Cleanup Level NE 800 (B) 0.03 (A) 160 (B) 6 (A) 8,000 (B) 0.02 (A) 5 (A) 4,000 (B) 8,000 (B) NE 8,000 (B) 0.05 (A) 7 (A) 0.03 (A) 16,000 (B) / 100 (A) a 2,000 (A) 2,000 (A) 1 (A) 5 b Notes: Values in bold font indicate that the result reported meets or exceeds the most current MTCA level based on the Ecology website. Model Toxics Control Act (MTCA) Cleanup Regulation, WAC MTCA Method A values are from Ecology website CLARC tables downloaded June 2015 ( MTCA Method B values are presented only when no MTCA Method A values are established. (A) - MTCA Method A (B) - MTCA Method B ft bgs - feet below ground surface J- estimated value UJ - Compound was analyzed for but not detected above the reporting limit shown. Reporting limit is an estimated value. mg/kg - milligram per kilogram NA - not analyzed NE - not established PCB - polychlorinated biphenyl PCE - tetrachloroethene TCE - trichloroethene TCLP - toxicity characteristic leaching procedure TPH - total petroleum hydrocarbon U - Compound was analyzed for but not detected above the reporting limit shown. VOC - volatile organic compound a The MTCA Method A soil screening level is 100 mg/kg if benzene is not present and the total of ethylbenzene, toluene, and xylenes is less than 1% of the gasoline mixture. The MTCA Method A screening level for all other gasoline mixtures is mg/kg. b TCLP regulatory limit from 40 CFR 261, Appendix II, 1993 J:\Projects\U\University of Washington\Capitol Hill Properties\Phase II ESA\Deliverables\Tables\Tables xlsx (Soil) 7/17/2015 Page 1 of 1

18 Table 3 Summary of Groundwater Analytical Results (ug/l) University of Washington - Roberta Moore Property Seattle, Washington DRAFT - Data Review Pending Sample ID Sample Date 1,2,4- Trimethylbenzene 1,3,5- Trimethylbenzene VOCs Ethylbenzene Isopropylbenzene Naphthalene n-butylbenzene n-propylbenzene 4-Isopropyltoluene sec-butylbenzene Toluene Vinyl Chloride Xylenes Gasoline-Range Diesel-Range Heavy Oil-Range Lead SB-1 6/17/ U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U U 1.00 U 50.0 U 49.9 U 99.7 U 12.3 SB-2 6/17/ U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U U 1.00 U 50.0 U 50.0 U 99.9 U 8.96 SB-5 6/18/ , U 99.2 U 14.6 SB-7 6/18/ U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U 1.00 U U 1.00 U 50.0 U 92.2 U 184 U NA TPH Metals MTCA Method A Groundwater Cleanup Level NE 80 (B) 700 (A) 800 (B) 160 (A) 400 (B) 800 (B) NE 800 (B) 1,000 (A) 0.2 (A) 1,000 (A) 800 / 1,000 (A) a 500 (A) 500 (A) 15 (A) Notes: Values in bold font indicate that the result reported meets or exceeds the most current MTCA level based on the Ecology website. Model Toxics Control Act (MTCA) Cleanup Regulation, WAC MTCA Method A values are from Ecology website CLARC tables downloaded June 2015 ( MTCA Method B values are presented only when no MTCA Method A values are established. (A) - MTCA Method A (B) - MTCA Method B NA - not analyzed NE - not established ug/l - microgram per liter TPH - total petroleum hydrocarbon U - Compound was analyzed for but not detected above the reporting limit shown. VOC - volatile organic compound a The MTCA Method A soil screening level is 1,000 ug/l if benzene is not present and the total of ethylbenzene, toluene, and xylenes is less than 1% of the gasoline mixture. The MTCA Method A screening level for all other gasoline mixtures is 800 ug/l. J:\Projects\U\University of Washington\Capitol Hill Properties\Phase II ESA\Deliverables\Tables\Tables xlsx (GW) 7/17/2015 Page 1 of 3

19 Table 4 Summary of Soil Gas Sample Analytical Results (ug/m 3 ) University of Washington-Roberta Moore Property Seattle, Washington Sample ID: Sub-Slab Screening SG-1 SG-2 Sample Date: Level a 6/18/2015 6/18/2015 VOCs Benzene Ethylbenzene 15, U Naphthalene PCE Toluene 76, TCE U 5.61 Total Xylenes 1, Notes: Values in bold font indicate that the result reported meets or exceeds the calculated soil gas screening level. a Ecology's Draft Guidance for Evaluating Soil Vapor Intrusion in Washington State: Investigation and Remedial Action, April 2015, Method B. ug/m 3 - microgram per cubic meter PCE - tetrachloroethene SG - soil gas TCE - trichloroethene VOC - volatile organic compound U - Compound was analyzed for but not detected above the reporting limit shown. Result pending re-analysis. J:\Projects\U\University of Washington\Capitol Hill Properties\Phase II ESA\Deliverables\Tables\Tables xlsx (Soil Gas) 7/17/2015 Page 3 of 3

20 Figures AECOM July 22/2015

21 604581_02.ai Seattle Washington Site Source: USGS 7.5-minute topographic quadrangle, Seattle North, Washington, 2014, and Seattle South, Washington, ,000 4,000 Scale in Feet Figure 1 Site Location Roberta Moore Property 416 and th Avenue E Seattle, Washington

22 604581_01.ai SEE DETAIL, FIGURE 3 East Republican Street SB Gallon Waste Oil UST SB-5 SB-8 Former Auto Garage 16th Avenue East 15th Avenue East SB-6 Alley SB-7 QFC Former Hand Laundry SG-1 SG-2 Former Superb Dye Works (Dry Cleaners) Legend SB-2 Subject property boundary SB-3 Basement SB-1 Boring location Superb Dry Cleaners Soil gas location East Harrison Street Approximate Scale in Feet Source: Googe Earth Pro Figure 2 Site Plan and Investigation Locations Roberta Moore Property 416 and th Avenue E Seattle, Washington

23 604581_03.ai 500-Gallon Waste Oil UST East Republican Street SB-4 SB-5 SB-8 SB-6 Former Auto Garage Alley 15th Avenue East SB-7 Source: Googe Earth Pro Legend Subject property boundary Boring location 0 60 Approximate Scale in Feet Figure 3 Detail of Former Auto Garage Area Investigation Roberta Moore Property 416 and th Avenue E Seattle, Washington

24 604581_04.ai SB Gallon Waste Oil UST Depth (ft) B MC PCE TCE VC Gx Dx SB-5 East Republican Street SB-4 SB-5 SB-8 15th Avenue East SB MC PCE TCE VC 1.69 Gx 1, ,9 Dx SB-8 Depth (ft) B MC PCE TCE VC Gx 184 Dx Alley SB-6 QFC SB-2 Depth (ft) GW B MC J PCE TCE VC Gx NA Dx NA Depth (ft) 5-7 B MC PCE TCE VC Gx Dx SB-7 Depth (ft) 5-7 GW B MC PCE TCE VC Gx Dx Former Hand Laundry SG-1 SG-2 SB-2 Superb Dry Cleaners SB-3 Former Dry Cleaners SB-1 SG-2 SB-1 Depth (ft) GW B MC J PCE SB Depth (ft) TCE B VC MC Gx NA PCE J Dx NA TCE J Gx NA Dx NA VC GW B SB-6 Former Auto Garage Depth (ft) SG-1 East Harrison Street B 4.39 E 1.76 N 12.2 PCE 67.5 T 7.81 TCE X 10.1 B E N 9.52 PCE 296 T 3.93 TCE 5.61 X Approximate Scale in Feet Legend Subject property boundary Basement Boring location Soil gas location B Benzene E Ethylbenzene MC N PCE T TCE Source: Googe Earth Pro Methlene chloride VC Vinyl chloride J X Total xylenes Toluene Trichloroethene Results in soil (mg/kg) Gasoline-range total petroleum hydrocarbon 1.69 Results in groundwater (µg/l) 12.2 Results in soil gas (µg/m3) Dx Diesel-range total petroleum hydrocarbon bold NA Not analyzed Not detected Exceeds MTCA Method A or B values (soil and groundwater) or Ecology s Method B screening level (soil gas) Gx Naphthalene Tetrachloroethene Estimated value Figure 4 Soil, Soil Gas and Groundwater Petroleum Hydrocarbon and VOC Results (June 2015) Roberta Moore Property 416 and th Avenue E Seattle, Washington

25 Appendix A Boring Logs AECOM July 22/2015

26 Project: Roberta Moore Property Project Location: 416 and th Avenue E, Seattle, WA Project Number: Log of Boring SB-1 Sheet 1 of 1 Date(s) Drilled 6/17/2015 Logged By AS Checked By Drilling Method GeoProbe Drilling Contractor Cascade Drilling Total Depth of Borehole 25 feet bgs Drill Rig Type Drill Bit Size/Type 2" Ground Surface Elevation (feet MSL) Groundwater Level (feet bgs) 20 ft bgs Sampling Method Continuous Hammer Data Borehole Backfill Bentonite Location QFC Parking Lot SAMPLES ENV2 W/O WELL J:\PROJECTS\GRFX\AECOM PROJECTS\ ROBERTA MOORE PROPERTY\604581LOGS.GPJ URSSEA3B AECOM.GLB URSSEA3.GDT 7/10/15 Elevation, feet Downhole Depth, feet Type Number SB SB SB SB SB-1-GW Blows/ 6in. Recovery (%) PID/OVM (ppm) Graphic Log USCS SP/GP SP/SM ML/SM SP ML SM Asphalt Brown to light gray fine to coarse SA and fine to coarse GRAVEL, brick fragment in part (dry) (fill) Brown silty fine to medium SA, trace fine gravel (moist) Light gray SILT, little fine sand (moist) Grading gray to dark gray sandy SILT (moist to very moist) Light gray to brown fine to medium SA, trace coarse sand (moist) Dark gray SILT (moist) Light gray silty SA (moist to wet) (collected groundwater sample at 20') No recovery, rock at shoe MATERIAL DESCRIPTION Boring was terminated at 25' bgs due to refusal. Groundwater was noted at 20' bgs. Boring was backfilled with bentonite. 20 ft REMARKS A OTHER TESTS Start: Finish: 0900

27 Project: Roberta Moore Property Project Location: 416 and th Avenue E, Seattle, WA Project Number: Log of Boring SB-2 Sheet 1 of 1 Date(s) Drilled 6/17/2015 Logged By AS Checked By Drilling Method GeoProbe Drilling Contractor Cascade Drilling Total Depth of Borehole 25 feet bgs Drill Rig Type Drill Bit Size/Type 2" Ground Surface Elevation (feet MSL) Groundwater Level (feet bgs) 19 ft bgs Sampling Method Continuous Hammer Data Borehole Backfill Bentonite Location QFC Parking Lot SAMPLES ENV2 W/O WELL J:\PROJECTS\GRFX\AECOM PROJECTS\ ROBERTA MOORE PROPERTY\604581LOGS.GPJ URSSEA3B AECOM.GLB URSSEA3.GDT 7/10/15 Elevation, feet Downhole Depth, feet Type Number SB SB SB SB-2-GW Blows/ 6in. Recovery (%) PID/OVM (ppm) Graphic Log USCS SP/GP SP ML SM ML Asphalt Brown fine to coarse SA with gravel (dry to moist) (no odor) (fill) Grading dark gray silt lense Grading black charcoal in part Light gray/some gray to brown fine to medium SA (moist) Grading gray fine to coarse SA, trace silt (dry to moist) Gray SILT with fine sand decreasing downward (very hard) (moist to dry) Grading dark gray, lenses of fine to medium sand and brown silt (moist) Light gray to gray silty SA (wet) (no odor) (collected groundwater sample at 19') Grading gray silty very fine SA (wet) Dark gray SILT (moist) MATERIAL DESCRIPTION Boring was terminated at 25' bgs due to refusal. Groundwater was noted at 19' bgs. Boring was backfilled with bentonite. 19 ft REMARKS A OTHER TESTS Start: Finish: 1100

28 Project: Roberta Moore Property Project Location: 416 and th Avenue E, Seattle, WA Project Number: Log of Boring SB-3 Sheet 1 of 1 Date(s) Drilled 6/17/2015 Logged By AS Checked By Drilling Method GeoProbe Drilling Contractor Cascade Drilling Total Depth of Borehole 25 feet bgs Drill Rig Type Drill Bit Size/Type 2" Ground Surface Elevation (feet MSL) Groundwater Level (feet bgs) NA Sampling Method Continuous Hammer Data Borehole Backfill Bentonite Location QFC Parking Lot SAMPLES ENV2 W/O WELL J:\PROJECTS\GRFX\AECOM PROJECTS\ ROBERTA MOORE PROPERTY\604581LOGS.GPJ URSSEA3B AECOM.GLB URSSEA3.GDT 7/10/15 Elevation, feet Downhole Depth, feet Type Number SB SB SB Blows/ 6in. Recovery (%) PID/OVM (ppm) Graphic Log USCS SP/GP SP ML SM ML SP ML Asphalt Light gray fine to coarse SA with fine to coarse gravel (dry) (fill) Brown-reddish fine to coarse SA with trace fine gravel (moist) Brown-yellowish SILT (moist) Grading gray SILT with trace fine gravel (moist) Grading (dry to moist) (no odor) Brown fine to medium SA (moist to wet) Dark gray SILT (hard) (moist to dry) Grading (moist) MATERIAL DESCRIPTION Brown fine to coarse SA with trace fine gravel (moist) Dark gray SILT (moist to dry) Grading brown SA with fine gravel lense Boring was terminated at 25' bgs due to refusal. Groundwater was not encountered. Boring was backfilled with bentonite. REMARKS A OTHER TESTS Start: Finish: 13

29 Project: Roberta Moore Property Project Location: 416 and th Avenue E, Seattle, WA Project Number: Log of Boring SB-4 Sheet 1 of 1 Date(s) Drilled 6/18/2015 Logged By AS Checked By Drilling Method GeoProbe Drilling Contractor Cascade Drilling Total Depth of Borehole 20 feet bgs Drill Rig Type Drill Bit Size/Type 2" Ground Surface Elevation (feet MSL) Groundwater Level (feet bgs) 7.5 ft bgs Sampling Method Continuous Hammer Data Borehole Backfill Bentonite Location West of 500-Gallon UST SAMPLES ENV2 W/O WELL J:\PROJECTS\GRFX\AECOM PROJECTS\ ROBERTA MOORE PROPERTY\604581LOGS.GPJ URSSEA3B AECOM.GLB URSSEA3.GDT 7/10/15 Elevation, feet Downhole Depth, feet Type Number SB Blows/ 6in. Recovery (%) PID/OVM (ppm) Graphic Log USCS SP SP/SM ML Concrete Air knife to 7' bgs Light gray to brown fine to medium SA (moist) (slight gasoline odor) Gray to dark gray silty SA (moist to wet) (strong gasoline odor) Dark gray SILT (moist) (hard) Grading (moderate gasoline odor) Boring was completed to 20' bgs. Groundwater was noted at 7.5' bgs. Boring was backfilled with bentonite. MATERIAL DESCRIPTION 7.5 ft REMARKS A OTHER TESTS Start: Finish: 15

30 Project: Roberta Moore Property Project Location: 416 and th Avenue E, Seattle, WA Project Number: Log of Boring SB-5 Sheet 1 of 1 Date(s) Drilled 6/18/2015 Logged By AS Checked By Drilling Method GeoProbe Drilling Contractor Cascade Drilling Total Depth of Borehole 23 feet bgs Drill Rig Type Drill Bit Size/Type 2" Ground Surface Elevation (feet MSL) Groundwater Level (feet bgs) 7.5 ft bgs Sampling Method Continuous Hammer Data Borehole Backfill Bentonite Location East of 500-Gallon UST SAMPLES ENV2 W/O WELL J:\PROJECTS\GRFX\AECOM PROJECTS\ ROBERTA MOORE PROPERTY\604581LOGS.GPJ URSSEA3B AECOM.GLB URSSEA3.GDT 7/10/15 Elevation, feet Downhole Depth, feet Type Number SB-5-GW SB SB Blows/ 6in. Recovery (%) PID/OVM (ppm) Graphic Log USCS SP ML SM ML Concrete Air knife to 7' bgs Brown-yellowish fine to medium SA (moist) (fill) Grading (slight gasoline odor) Light brown SILT (moist to wet) (collected groundwater sample at 7.5') Gray silty fine to medium SA (strong gasoline odor) Dark gray SILT (hard) (moist) Grading (moderate gasoline odor) Grading fine to medium SA lense MATERIAL DESCRIPTION Grading dark gray (moist) (moderate gasoline odor) Boring was terminated at 23' bgs due to refusal. Groundwater was noted at 7.5' bgs. Boring was backfilled with bentonite. 7.5 ft REMARKS A OTHER TESTS Start: Finish: 1400

31 Project: Roberta Moore Property Project Location: 416 and th Avenue E, Seattle, WA Project Number: Log of Boring SB-6 Sheet 1 of 1 Date(s) Drilled 6/18/2015 Logged By AS Checked By Drilling Method GeoProbe Drilling Contractor Cascade Drilling Total Depth of Borehole 25 feet bgs Drill Rig Type Drill Bit Size/Type 2" Ground Surface Elevation (feet MSL) Groundwater Level (feet bgs) NA Sampling Method Continuous Hammer Data Borehole Backfill Bentonite Location North Parking Lot SAMPLES ENV2 W/O WELL J:\PROJECTS\GRFX\AECOM PROJECTS\ ROBERTA MOORE PROPERTY\604581LOGS.GPJ URSSEA3B AECOM.GLB URSSEA3.GDT 7/10/15 Elevation, feet Downhole Depth, feet Type Number SB SB Blows/ 6in. Recovery (%) PID/OVM (ppm) Graphic Log USCS SP/GP SP/SM ML Asphalt Light brown fine to coarse SA with some fine gravel (moist) (no odor) (fill) Light gray fine to medium SA with little silt and trace fine gravel (moist) Light gray to dark gray SILT (hard) (moist) (no odor) Grading dark gray SILT (moist) Grading (hard) MATERIAL DESCRIPTION Boring was terminated at 25' bgs due to refusal. Groundwater was not encountered. Boring was backfilled with bentonite. REMARKS A OTHER TESTS Start: Finish: 09

32 Project: Roberta Moore Property Project Location: 416 and th Avenue E, Seattle, WA Project Number: Log of Boring SB-7 Sheet 1 of 1 Date(s) Drilled 6/18/2015 Logged By AS Checked By Drilling Method GeoProbe Drilling Contractor Cascade Drilling Total Depth of Borehole 20 feet bgs Drill Rig Type Drill Bit Size/Type 2" Ground Surface Elevation (feet MSL) Groundwater Level (feet bgs) 5 ft bgs Sampling Method Continuous Hammer Data Borehole Backfill Bentonite Location North Parking Lot SAMPLES ENV2 W/O WELL J:\PROJECTS\GRFX\AECOM PROJECTS\ ROBERTA MOORE PROPERTY\604581LOGS.GPJ URSSEA3B AECOM.GLB URSSEA3.GDT 7/10/15 Elevation, feet Downhole Depth, feet Type Number SB SB-7-GW SB Blows/ 6in. Recovery (%) PID/OVM (ppm) Graphic Log USCS SP/GP ML SP ML Asphalt Brown fine to coarse SA with some fine gravel and silt Grading light gray fine to medium SA with trace silt (moist) (fill) Light gray SILT (moist) Gray fine to medium SA (moist) Light gray SILT (moist) (no odor) Grading (wet) (collected groundwater sample at 6') Grading dark gray Grading dark gray SILT (moist) (no odor) Grading (moist to dry) MATERIAL DESCRIPTION Boring was terminated at 20' bgs due to refusal. Groundwater was noted at 6' bgs. Boring was backfilled with bentonite. 5 ft REMARKS A OTHER TESTS Start: Finish:

33 Project: Roberta Moore Property Project Location: 416 and th Avenue E, Seattle, WA Project Number: Log of Boring SB-8 Sheet 1 of 1 Date(s) Drilled 6/18/2015 Logged By AS Checked By Drilling Method GeoProbe Drilling Contractor Cascade Drilling Total Depth of Borehole 15 feet bgs Drill Rig Type Drill Bit Size/Type 2" Ground Surface Elevation (feet MSL) Groundwater Level (feet bgs) 8.5 ft bgs Sampling Method Continuous Hammer Data Borehole Backfill Bentonite Location South of 500-Gallon UST SAMPLES ENV2 W/O WELL J:\PROJECTS\GRFX\AECOM PROJECTS\ ROBERTA MOORE PROPERTY\604581LOGS.GPJ URSSEA3B AECOM.GLB URSSEA3.GDT 7/10/15 Elevation, feet Downhole Depth, feet Type Number SB SB SB Blows/ 6in. Recovery (%) PID/OVM (ppm) > Graphic Log USCS SP/SM SP ML Asphalt Brown-reddish fine to coarse SA with trace silt and fine gravel (moist) (fill) Grading light gray-yellowish fine to medium SA (slight gasoline odor) Light gray fine to medium SA with trace silt and gravel (moist) Grading gray to dark gray, trace to little silt (moist to wet) Dark gray SILT (hard) (moist) (strong gasoline odor) Grading (moderate gasoline odor) Grading (slight gasoline odor) Boring was completed to 15' bgs. Groundwater was noted at 8.5' bgs. Boring was backfilled with bentonite. MATERIAL DESCRIPTION 8.5 ft REMARKS A OTHER TESTS Start: Finish: 1600

34 Appendix B Photographic Log AECOM July 22/2015

35 AECOM University of WA Photo No. 1 Direction Photo Taken: North Roberta Moore Property 416 and th Avenue East Seattle, Washington PHOTOGRAPHIC LOG AECOM Project No.: Date: June 17/18, 2015 Description: Basement of QFC where sub-slab soil gas sampling performed. Sample location SG-1 Vapor Pin installed in the floor adjacent to closest cardboard box. Photo No. 2 Direction Photo Taken: Southwest Description: QFC basement, subslab sampling location SG-2. Summa canister with leak testing apparatus shown. Helium tank in the foreground used for leak testing.

36 AECOM University of WA Photo No. 3 Direction Photo Taken: West Roberta Moore Property 416 and th Avenue East Seattle, Washington PHOTOGRAPHIC LOG AECOM Project No.: Date: June 17/18, 2015 Description: QFC basement, subslab sampling location SG-1. Photo No. 4 Direction Photo Taken: North Description: Area of 500-gallon waste oil UST and former automotive garage. UST located beneath sidewalk. Patched boring locations SB-4 and SB- 5 evident. Boring location SB-8 is also shown in foreground.

37 AECOM University of WA Photo No. 5 Direction Photo Taken: Roberta Moore Property 416 and th Avenue East Seattle, Washington PHOTOGRAPHIC LOG AECOM Project No.: Date: June 17/18, 2015 Description: Soil conditions at SB-3 from 5 to 10 feet bgs. PCE detected in this sample interval. Photo No. 6 Direction Photo Taken: Description: Soil conditions at SB-3 from 10 to 15 feet bgs. PCE detected in this sample interval.

38 AECOM University of WA Roberta Moore Property 416 and th Avenue East Seattle, Washington PHOTOGRAPHIC LOG AECOM Project No.: Date: June 17/18, 2015 Photo No. 7 Direction Photo Taken: Description: Soil conditions at SB-3 from 15 to 20 feet bgs. Photo No. 8 Direction Photo Taken: Description: Soil conditions at SB-5 from 10 to 15 feet bgs Gasoline odors detected in this interval.

39 AECOM University of WA Photo No. 9 Direction Photo Taken: Southeast Roberta Moore Property 416 and th Avenue East Seattle, Washington PHOTOGRAPHIC LOG AECOM Project No.: Date: June 17/18, 2015 Description: Soil conditions at SB-5 from 15 to 20 feet bgs. Gasoline detected in this interval. Photo No. 10 Direction Photo Taken: Northeast Description: 500-gallon Waste Oil UST location beneath sidewalk on north side of the property adjacent to East Republican Street. Concrete cored boring locations SB-4 and SB-5. Note white spray paint demarks the tank location.