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21 December 2017 <br />AGE-Project No. 14-3154 <br />Page 10 of 23 <br /> <br />5.0. GEOTECHINCAL INVESTIGATION <br /> <br />A foundation investigation was conducted at the site Raney Geotechnical, Inc. in <br />November 2016. Soil borings were advanced in the waste/glass handling area with the <br />intent to evaluate the subsurface soils and potential wastes. A total of fifteen (15) soil <br />borings were advanced to depths ranging between 10 feet bsg (Raney Boring 15) and 50 <br />feet bsg (Raney Boring 1). The boring logs are included in Appendix A with a separate <br />map for review. Only boring B2 encountered glass or waste and boring B15 noted <br />cemented particles. <br /> <br /> <br />6.0. DUE DILIGENCE SITE INVESTIGATION (Brusca Associates Inc.) <br /> <br />A surface / subsurface screening investigation was conducted at the site by Brusca <br />Associates Inc. on 26 April 2017. The investigation included advancing five borings for <br />collection of soil and groundwater samples, and collection of four surface soil samples. <br />Soil samples were analyzed for potential chemicals of concern. Low concentrations of oil <br />(minor diesel) were detected at one boring location in the former waste/glass handling <br />area. Low concentrations of PCBs were detected in the surface soil samples, with the <br />maximum concentration detected in the waste/glass handling area at a depth of <br />approximately four (4) feet bsg. <br /> <br />Groundwater samples were analyzed for chemicals of concern, with chlorinated <br />pesticides, sulfolane, total dissolved solids (TDS), nitrates, ethylene dibromide (EDB), <br />and 1,2-Dibromo-3-chloropropane (DBCP). Minor concentrations of oil and diesel range <br />petroleum hydrocarbons were detected in two groundwater samples located in the central <br />and southeastern portion of the site; groundwater samples from the two borings located <br />in the western portion of the site were non-detect for petroleum. The detections of nitrate <br />as nitrogen and TDS were elevated in the southeastern portion of the site, near the <br />boundary with the JR Simplot facility (Appendix F). <br /> <br /> <br />7.0. OFF-SITE TRENCHING <br /> <br />The LEA directed additional investigation in May 2017 be performed on the adjacent <br />property to the west (Cogen), directly west of the southwesterly portion of the site to <br />evaluate the potential for additional buried waste in this area. A total of eleven (11) <br />additional trenches were established during this phase of the investigation. Trenches <br />T100 through T106 were established in the southern portion of the Cogen property to the <br />west. During excavation of T100 through T106, the LEA directed that trenching continue <br />towards the east, onto the subject property and along the southern property boundary. <br />No waste was encountered in Trenches T100 through T110. Native soil and an <br />abandoned irrigation pipe was encountered at a depth of 8 feet bsg (Figure 3; <br />Appendix B). <br />