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15 June 2016 <br />AGE Project No. 14-3154 <br />Page 2 of 5 <br /> <br />Advanced GeoEnvironmental, Inc. <br /> <br /> <br /> <br /> <br />Trenching of earth within the former glass management area footprint and surrounding <br />areas was conducted to evaluate the limits of waste buried (T1 to T23) and to provide for <br />additional trench soil evaluation and sampling (T24 to T91). Trench locations are <br />illustrated in Figure 2. <br /> <br />Generally, tan, brown to dark brown, silts and sands were encountered between surface <br />grade and approximately 15 feet below surface grade (bsg). <br /> <br />Soil samples and grab groundwater samples were collected from borings and trenches. <br />Soil samples were analyzed for CAM 17 metals, volatile organic compounds (VOCs), <br />polychlorinated bi-phenols (PCBs), polynuclear aromatic hydrocarbon (PNA), polycyclic <br />aromatic hydrocarbons (PAH) or semi-volatile organic compounds (SVOCs), dioxin and <br />furan and total petroleum hydrocarbons (TPH). Detections of organic compounds were <br />summarized. <br /> <br />Analytical results for the CAM 17 detected concentrations are listed in the attached <br />Tables 1, 2 and 3. Water sample analysis for CAM17 Metals is also attached and <br />summarized in Table 4. The summarized results of the soil and water sample chemical <br />analysis is additionally presented for each samples. Analytical laboratory data sets are <br />included. <br /> <br />The majority of the water samples have demonstrated no direct impact to the water quality <br />or no significant impact to the shallow groundwater. Trench T64 water sample was <br />collected within the north waste glass cell as illustrated in Figure 2, and initially <br />demonstrated minor concentrations of petroleum hydrocarbons (TPH-diesel) present in <br />the shallow groundwater, below buried waste. Subsequent grab groundwater samples <br />collected within the base of the same waste glass cell (north excavation area) did not <br />have any detections of petroleum hydrocarbons. <br /> <br />One soil boring groundwater sample (AB26) collected within the former glass <br />management area had detections of dioxin and furan. Only Octachlorodibenzo-p-dioxin <br />(OCDD) was detected and not the regulated compound 2,3,7,8-TCDF; which has a <br />drinking water quality standard. Two other grab groundwater samples (AB27/AB28) <br />collected within the former glass management area did not have detections. Monitoring <br />wells sampled also did not demonstrate detections of dioxin and furan. <br /> <br />Additionally, soil samples collected in the former glass management area demonstrated <br />that the area was not adversely impacted by the operations of glass waste handling/burial, <br />nor have the soil samples collected demonstrated significant residual metals <br />concentrations. None of the metals concentrations (TTLC – Total Threshold Limit <br />Concentration) detected exceed hazardous waste criteria. <br /> <br />The additional analysis of the in-situ soil for soluble metals (STLC – Soluble Threshold <br />Limit Concentration) collected and analyzed from the former glass handling/burial area <br />did not reflect hazardous waste concentrations.