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<br /> December 29, 2016 | Page 6 File No. 0504-119-00 <br />TABLE 3. SUMMARY OF CHEMICAL ANALYTICAL RESULTS – GROUNDWATER (BTEXN) <br />Sample Identification Date Sampled Units Benzene Toluene Ethylbenzene m,p-Xylene o-Xylene Total Xylenes Naphthalene Site-3:B-1:120216 12/02/16 µg/L 0.76 3.0 1.9 <2.0 <1.0 <3.0 8.8 <br />Site-3:B-2:120216 12/02/16 µg/L 2.3 <1.0 2.3 <2.0 <1.0 <3.0 <2.0 <br />Site-3:B-3:120216 12/02/16 µg/L <0.20 2.9 <1.0 <2.0 <1.0 <3.0 <2.0 <br />Site-3:B-5:120216 12/02/16 µg/L <0.20 <1.0 <1.0 <2.0 <1.0 <3.0 <2.0 <br />MTCA Method A CUL1 µg/L 5 1,000 700 -- -- 1,000 160 <br />Notes: <br />1MTCA Method A CUL - Washington State Model Toxics Control Act Method A unrestricted land use cleanup level <br />µg/L – Micrograms per liter <br />Bold - Analyte concentrations are greater than the laboratory method reporting limit. <br />TABLE 4. SUMMARY OF CHEMICAL ANALYTICAL RESULTS – GROUNDWATER (TPH) <br />Sample <br />Identification Date Sampled <br />GRPH1 <br />(µg/L) <br />DRPH2 <br />(mg/L) <br />ORPH2 <br />(mg/L) <br />Site-3:B-1:120216 12/02/16 1,900 9.6 0.83 <br />Site-3:B-2:120216 12/02/16 270 0.19 <0.22 <br />Site-3:B-3:120216 12/02/16 <100 <0.13 0.41 <br />Site-3:B-5:120216 12/02/16 <100 <0.13 0.28 <br />MTCA Method A CUL3 1,000/8004 0.5 0.5 <br />Notes: <br />1GRPH analyzed using Northwest Method NWTPH-Gx. <br />2DRPH analyzed using Northwest Method NWTPH-Dx. <br />3MTCA Method A CUL - Washington State Model Toxics Control Act Method A unrestricted land use cleanup level <br />4Cleanup level for gasoline-range petroleum hydrocarbons is 1,000 µg/l if benzene is not detected and the total concentrations of <br />ethylbenzene, toluene, and xylenes are less than 1 percent of the gasoline mixture; otherwise the cleanup level is 800 µg/l. <br />mg/L = milligrams per liter <br />Bold - Analyte concentrations are greater than the laboratory method reporting limit. <br />Yellow Highlight – Analyte concentrations exceeds MTCA Method A cleanup level. <br />6.0 SUMMARY, CONCLUSIONS AND RECOMMENDATIONS <br />Soil and groundwater assessment activities were conducted December 2, 2016 at the Kittitas County Lower <br />Shop site located at 505 West 14th Avenue in Ellensburg, Washington. Seven soil borings (B-1 through B-7) <br />were advanced with depths ranging between 8 and 10½ feet bgs. Observed soil generally consisted of <br />shallow sand and gravel underlain by silt and/or clay and included clay with sand, silty sand, silty gravel, <br />fine to coarse gravel with silt, clay with gravel, and silt with sand. Groundwater was encountered in the <br />borings between 4½ and 8 feet bgs. <br />One soil sample from each boring was submitted for BTEXN, GRPH, DRPH and ORPH analysis. Benzene <br />and/or GRPH concentrations exceeded the MTCA Method A cleanup levels in borings B-1 and B-2. Four