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05 January 2018 AdvantedCieo <br /> AGE Project No. 14-3154 F r)v i ro ri rn e n t a l <br /> Page 8 of 9 <br /> Sidewall Soil Borings <br /> A total of eight (8) soil borings will be advanced along the north and south sidewalls of <br /> the waste cell excavations. Two soil borings will be advanced along the north and south <br /> sidewalls of each waste cell to collect one sidewall soil sample from each location. <br /> Sidewall soil borings will be advanced to total depths of eight (8) feet bsg in the North <br /> Waste Cell and six (6) feet bsg in the South Waste Cell. One soil sample will be collected <br /> at the termination of each sidewall boring and analyzed for dioxin/furans and the full list <br /> of PCBs. <br /> 4.3. REPORT PREPARATION <br /> Upon completion of field work and receipt of final laboratory analysis, an updated Site <br /> Assessment Summary Report will be prepared presenting the findings of the <br /> investigation. The report will include a description of the work performed and results of <br /> the sampling and analysis. Conclusions, applicable recommendations, maps, cross- <br /> sections of waste and an updated conceptual site model will be included in the report. <br /> The report will be in a format acceptable to CVRWQCB and will be reviewed and signed <br /> by a California Professional Geologist. <br /> 5.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of <br /> a California Professional Geologist. Procedures for the advancement of soil borings, soil <br /> sampling, equipment decontamination and sample shipment are outlined below. <br /> 5.1. SOIL BORING ADVANCEMENT <br /> Proposed soil borings will be advanced utilizing a van-mounted direct-push drilling rig <br /> equipped with 1.5-inch diameter hollow-probing rods. The direct-push drilling rig <br /> advances soil probe borings using a hydraulic hammer to drive soil sampling tools to <br /> specified depths. A total of 17 soil borings will be advanced within the waste cells to <br /> depths of 15 feet bsg (North Waste Cell) and 12 feet bsg (South Waste Cell); a minimum <br /> of 7 soil borings will be advanced surrounding the former waste cells to depth of 15 feet <br /> bsg; and a total of 8 soil borings will be advanced along the sidewalls of the former <br /> excavation areas. Proposed boring locations are illustrated in Figure 3. <br /> 5.2. SOIL SAMPLING <br /> Soil samples will be collected from the borings using a 1.5-inch or 2-inch diameter <br /> Geoprobe soil sampling assembly loaded with a two-foot or four-foot acetate liner. Soil <br /> samples will be collected continuously between 10 feet and 12 feet bsg in the South <br />