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21 October 2020 <br />Project No. 14-3002 <br />Page 2 of 15 <br />borings were advanced along the eastern property boundary to define the waste cell and <br />three (3) additional borings were advanced in the former power plant area to assess <br />impacts to soil. <br /> <br />Borings B44 through B79 were advanced to total depths ranging between five (5) feet <br />and twenty (20) feet below surface grade (bsg); except for boring B78 which encountered <br />refusal at two (2) feet bsg. The following is a summary of boring depths and locations: <br /> <br /> B51 through B54 were advanced to 5 feet bsg in the former power plant area. <br /> B44, B45, B49, B55, B56, B57, B59, B60, B61 and B62 were advanced to 10 feet <br />bsg in the former power plant area. <br /> B47 and B50 were advanced to 15 feet bsg in the former power plant area. <br /> B46, B48, B58 and B63 through B68 were advanced to 20 feet bsg in the former <br />power plant area. <br /> B78 was advanced to 2 feet bsg before encountering refusal and B79 was <br />advanced to 15 feet bsg just outside the eastern boundary of the former power <br />plant area. <br /> B69, B70 and B71 were advanced to 8.25, 7.50 and 7.75 feet bsg, respectively, <br />along the eastern property boundary. <br /> B72 and B74 were advanced to 5 feet bsg along the eastern property boundary. <br /> B73, B75, B76 and B77 were advanced to 10 feet bsg along the eastern property <br />boundary. <br /> <br />Soil samples were collected continuously in all borings and groundwater samples were <br />collected from borings B46, B48, B65, B67 and B79. Borings B46, B48, B65 and B67 <br />were advanced inside the former power plant area and are at higher surface elevations <br />then the surrounding area; groundwater was encountered in these borings at <br />approximately 15 feet bsg. Groundwater was encountered in B79, advanced outside of <br />the former power plant area, at approximately 11 feet bsg. <br /> <br />The borings were advanced utilizing a track-mounted, Geoprobe 6712DT direct-push <br />probing unit equipped with 1.0-inch diameter probing rods. The Geoprobe advances soil <br />probe borings using a hydraulic hammer to drive sampling tools to specified depths. Soil <br />boring locations are depicted in Figure 2. <br /> <br /> <br />3.1. SOIL SAMPLE COLLECTION <br /> <br />Soil samples were collected continuously from surface grade to total depth in borings B44 <br />through B79. Soil samples were collected at five-foot intervals using a 1-inch diameter <br />Geoprobe soil sampling assembly loaded with a five-foot long acetate sleeve. After