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24 May 2021 <br />Project No. 14-3002 <br />Page 22 of 23 <br /> <br />Several borings were advanced in the 3.5-acre open field in the southern portion of the <br />Site to locate and identify waste and test for COCs. No waste was encountered in these <br />locations and COCs were generally not-detect. <br /> <br /> <br />5.7. DATA GAPS AND ADDITIONAL SAMPLING <br /> <br />AOC1 <br /> <br />Buried waste has been defined in AOC1 and COC contamination has been defined in <br />Waste Cell No. 1. Only limited sampling and analysis was performed in Waste Cell <br />No. 1A. However, the limited data collected, combined with confirmation data from the <br />remediation of the SWC, indicates that COC contamination should be consistent with <br />Waste Cell No. 1. If this waste cell is excavated and removed, additional sampling should <br />be performed. There are currently no data gaps in this area and AGI does not propose <br />further site characterization in AOC1. <br /> <br /> <br />AOC2 <br /> <br />Data gaps were identified in several locations in AOC2 and to the south and west of <br />AOC2. The following data gaps were identified: <br /> <br /> Waste Cell No. 2A is undefined to the south and west. <br /> Both waste cells are defined by data that was inferred by a limited number of <br />borings advanced to selected depths. <br /> A limited amount of data was collected in the southeastern portion of the Facility, <br />between the waste cells. <br /> PCB and TPH contamination in soil and waste are undefined to the east, west and <br />south. <br /> Dissolved TPH contamination is undefined. <br /> Total lead concentrations in groundwater need to be confirmed for the dissolved <br />component. <br /> <br />Waste was not uniformly buried or distributed on the subject property. Several borings <br />were advanced to depths of 5 and 10 feet bsg in the area where waste limits were inferred <br />(i.e., B30, B39, B42, B43, B49 and B52). After a thorough evaluation of the data and <br />cross-sections, there is a potential that waste exists in these locations at greater depths <br />than was investigated. Additional borings should be advanced to confirm the vertical <br />extent of waste and verify the inferred lateral extents. Furthermore, additional borings <br />should be advanced for soil and groundwater sample collection to define the extents of