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0 <br /> CalRecycle Requirement: Prepare a scaled topographic map (in AutoCAD or other <br /> engineering program) that depicts the disposal area boundary (1 inch = 100 feet) <br /> AGE will contract with an engineer to provide a detailed, scaled topographic map of the <br /> waste handling area. The map will be included in a report of findings. <br /> CalRecycle Requirement: Conduct a trenching investigation based on the <br /> geophysical survey boundary - collect data on horizontal and vertical extent of <br /> waste, cover conditions and waste characteristics <br /> AGE has previously excavated 23 shallow trenches within the former waste handling <br /> area to evaluate and document that soil cover thickness, waste strata and native soil <br /> depth. Generally, the soil cover ranged from three (3) to four (4) feet in thickness and <br /> was composed of clean, native borrow soil. Waste glass cullet and cemented glass <br /> were noted above a native silty, sandy soil which was exposed in each trench <br /> established. The depth of native soil was no less than three feet and no greater than <br /> five to six feet. Native soil was sampled at each trench under the oversight of an LEA <br /> inspector. <br /> CalRecycle Requirement: Collect 20-30 samples from the disposal area and <br /> analyze for CAM 17 Metals (TTLC & STLC), Semivolatiles (8270), PCBs, PAHs, <br /> Dioxins and Furans <br /> In December 2014, AGE collected 14 samples of native soil from depths between 5 and <br /> 10 feet below surface grade. Samples were collected from the area designated as the <br /> PNA "Disposal" site. This work was documented in the Preliminary Site Assessment <br /> Report (preliminary dated 24 December 2014 and final dated 30 January 2015) and <br /> supplied to the Regional Water Quality Control Board and LEA. Soil samples were <br /> analyzed for TTLC Cam 17 Metals, petroleum hydrocarbons, VOCs, SVOCs, PCBs and <br /> PNAs. No significant concentrations of target analytes were reported in the laboratory <br /> results. <br /> In April 2015, at the direction of the LEA AGE collected 22 samples of "native"soil and <br /> 22 soil/waste stockpile samples; samples were collected from the trenching <br /> investigation areas. Soil samples were analyzed for TTLC Cam 17 Metals, petroleum <br /> hydrocarbons, VOCs and SVOCs. Based on soil boring data, several chemical suites <br /> were not analyzed to reduce some investigation costs. <br /> Several metals were detected in the soil samples, but were in line with what is likely to <br /> be considered `background' levels. Soil/waste stockpile samples were <br /> collected/analyzed for TTLC Cam 17 Metals, petroleum hydrocarbons, VOCs and <br /> SVOCs. Again, low concentrations of metals were detected, most likely at `background' <br /> levels. Of note, selenium was non-detect and cobalt detections were very low. <br />