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March 7, 2019 | Page 4 File No. 0504-119-01 TABLE 2. SUMMARY OF CHEMICAL ANALYTICAL RESULTS Monitoring Well Sample ID Petroleum- Range Hydrocarbons (µg/L)1 Volatile Organic Compounds (µg/L)1,3 GRPH2 Benzene Toluene Ethyl- benzene o-Xylene m,p-Xylenes Total Xylenes MW-1 MW-1:013019 <150 <0.40 <1.0 <1.0 <1.0 <2.0 <3.0 MW-2 MW-2:013019 <150 <0.40 <1.0 <1.0 <1.0 <2.0 <3.0 MW-3 MW-3:013019 <150 <0.40 <1.0 <1.0 <1.0 <2.0 <3.0 MW-4 MW-4:013019 <150 <0.40 <1.0 <1.0 <1.0 <2.0 <3.0 MW-5 MW-5:013019 <150 <0.40 <1.0 <1.0 <1.0 <2.0 <3.0 MW-6 MW-6:013019 <150 <0.40 <1.0 <1.0 <1.0 <2.0 <3.0 Duplicate 1/30/19 <150 <0.40 <1.0 <1.0 <1.0 <2.0 <3.0 MTCA Method A Cleanup Levels 1000/8004 5 1,000 700 1,0005 Notes: 1Chemical analyses completed by TestAmerica Laboratories, Inc. located in Spokane Valley, Washington. 2GRPH were analyzed by Northwest Method NWTPH-Gx. 3BTEX and MTBE were analyzed by EPA 8260. 4Cleanup level for gasoline-range petroleum hydrocarbons is 1,000 µg/L if benzene is not detected; otherwise the cleanup level is 800 µg/L. 5Cleanup level for total xylenes (o-xylene and m,p-xylene) is 1,000 µg/L. Concentrations were summed to determine compliance. µg/L = micrograms per liter Bold indicates the contaminant was detected at a concentration greater than the laboratory reporting limits. 6.0 SUMMARY, CONCLUSIONS AND RECOMMENDATIONS Groundwater monitoring was conducted on January 30, 2019 at the Kittitas County Shop located at 505 West 14th Avenue in Ellensburg, Washington. Six groundwater samples collected from monitoring wells MW-1 through MW-6 were submitted for GRPH and BTEX analysis. No analytes were detected at concentrations greater than laboratory reporting limits. We recommend continuing groundwater monitoring for at least one additional quarter (assuming contaminant concentrations are not detected greater than MTCA cleanup levels) to obtain a data set spanning four quarters.