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<br /> December 29, 2016 | Page 2 File No. 0504-119-00 <br />were set in four of the borings to collect groundwater samples. Continuous soil samples <br />were collected using 4-foot-long acrylic slip-sleeve samplers. <br />b. Collecting four groundwater samples from borings B-1 through B-3, and B-5. <br />c. Observing and documenting subsurface soil conditions. At least one soil sample was <br />retained from each slip-sleeve sampler for field screening and potential chemical analysis. <br />Field screening consisted of photo-ionization detector (PID) screening, visual observation <br />and water-sheen testing. <br />d. Drumming and labeling investigation-derived waste (IDW). <br />5. Submitting one soil sample from each boring to TestAmerica Laboratories, Inc. (TestAmerica) for <br />chemical analysis. The soil sample with the greatest field screening indication of potential <br />contamination or the sample collected from the bottom of the boring was submitted for chemical <br />analysis. Soil samples were submitted for analysis of benzene, toluene, ethylbenzene, total xylenes and <br />naphthalene (BTEXN) using EPA Method 8260C; GRPH using Northwest Method NWTPH-Gx, and diesel- <br />and oil-range petroleum hydrocarbons (DRPH and ORPH, respectively) using Northwest Method <br />NWTPH-Dx. <br />6. Submitting four groundwater samples for BTEXN, GRPH, DRPH and ORPH analysis using the methods <br />listed above. <br />7. Entering analytical data into Ecology’s Environmental Information Management (EIM) database. <br />8. Preparing this assessment report. <br />4.0 FIELD ACTIVITIES <br />4.1. General <br />Field assessment activities were conducted on December 2, 2016. Site utilities, located near the boring <br />locations, were identified and marked by Utilities Plus prior to drilling. Environmental West advanced seven <br />borings (B-1 through B-7) near and within the former UST excavation using direct-push drilling methods. <br />The direct-push boring locations are summarized by the following: <br />■ Soil boring B-1 was drilled at the northwestern corner of the former UST excavation to 10½ feet bgs <br />before meeting refusal. Three soil samples for potential chemical analysis were collected from the <br />2-, 4½- and 9-foot-depth intervals for potential chemical analysis. Groundwater was encountered at <br />about 8 feet bgs. A temporary well screen was set between 7½ and 9½ feet bgs, and a groundwater <br />sample was collected. <br />■ Soil boring B-2 was drilled approximately 8 feet north of the former UST excavation. B-2 was advanced <br />to a depth of 9 feet bgs before meeting refusal. Soil samples were collected at the 2-, 4½- and 8-foot- <br />depth intervals for potential chemical analysis. Groundwater was encountered at about 4½ feet bgs. A <br />temporary well screen was set between 4 and 6 feet bgs, and a groundwater sample was collected. <br />■ Soil boring B-3 was drilled approximately 25 feet north of the former UST excavation. B-3 was advanced <br />to a depth of 8½ feet bgs before meeting refusal. Soil samples were obtained at the 3½-, 6½- and <br />8-foot-depth intervals for potential chemical analysis. Groundwater was encountered at about 8 feet