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15 June 2016 <br />AGE Project No. 14-3154 <br />Page 4 of 5 <br /> <br />Advanced GeoEnvironmental, Inc. <br /> <br /> <br /> <br /> <br />Remediation at this location (late September 2015) involved the use of the excavator, <br />which trenched down to native soil beneath any waste discovered (the current soil cap <br />was set aside for segregation and reuse). The majority of waste stream was comprised <br />of steel parts or window components (rusted), glass, and minor plastics. <br /> <br />Excavations removed the waste from the waste cells and adequately defined the <br />horizontal and vertical extent of the buried waste on the property to the western boundary. <br />Excavation was required to a depth of 13 feet bsg at some locations (north cell), through <br />the use of an excavator (removing the encountered waste) to reach native soil. <br /> <br />The waste excavation and remediation activities were witnessed by Mr. Harprit Mattu of <br />SJCEHD. <br /> <br />Shallow groundwater was encountered in the base of the northern waste cell at a depth <br />of approximately 14-15 feet bsg (Trench T64). Subsequent to the remediation, four “grab” <br />groundwater samples (C2 series samples) were collected from the standing groundwater <br />(within only the northern waste cell). The samples were collected at the request of the <br />California Regional Water Quality Control Board to evaluate the potential impact from the <br />removed waste, on the groundwater and to document the remediation of the previous <br />minor detection of petroleum. Following waste remediation, petroleum impact to the <br />groundwater (petroleum hydrocarbons TPH-d at trench T64) was not detected in the three <br />analyzed groundwater samples. Various metals were detected in the sample C2NE at <br />low concentrations and only arsenic was above a drinking water standard. <br /> <br /> <br />WASTE REMOVAL AND CLOSURE <br /> <br />Removal of the waste from the site to a Class II landfill was conducted in December 2015. <br />Approximately 3,567 tons of waste glass, minor garbage and cover soils were disposed. <br />The waste glass/metal was loaded into end dump trucks for transport to Forward Landfill <br />under special waste manifest. <br /> <br />The excavation is finalized; it produced a volume of over 2,200 cubic yards of waste. The <br />waste has been removed and therefore removes the requirement to continue to excavate <br />waste. <br /> <br /> <br />BACKFILLING <br /> <br />A plastic sheet barrier was vertically installed in the edges of the former waste cell areas, <br />at the western edge of the property boundary (for clear delineation), prior to backfilling <br />and compacting the excavations with native clean imported soil. <br /> <br /> <br />