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17 March 2020 <br />Project No. 14-3002 <br />Page 3 of 5 <br /> One boring will be advanced to 5 feet bsg between the former locations of the gas <br />turbine package and high voltage/breaker building. <br /> One boring will be advanced to 5 feet bsg within the former transformer <br />containment area in the southwest corner of the power plant area. <br /> One boring will be advanced to 10 feet bsg adjacent to the sump located to the <br />east of the former control room building. <br /> One boring will be advanced to 10 feet bsg in the location of boring B32. <br /> Four borings will be advanced to 10 feet bsg surrounding boring B35; borings will <br />be advanced between 5 and 10 feet from B35. <br /> <br />The proposed soil borings will be advanced utilizing a 2-inch diameter hand auger or a <br />direct-push drilling rig equipped with 1.25-inch or 2-inch diameter hollow-probing rods. <br />Soil samples and potential waste samples (if encountered) will be collected from the <br />borings using a 2-inch diameter hand-auger or a Geoprobe soil sampling assembly <br />loaded with a two-foot or four-foot acetate liner. Soil samples will be collected <br />continuously between the surface and the total depth of all borings. Soil and waste <br />encountered in the borings will be visually classified by AGI personnel in accordance with <br />the USCS or type of materials encountered. Additionally, soil samples will be field <br />screened for the presence of volatile organic compounds (VOCs) using an organic vapor <br />meter equipped with a photo-ionization detector (PID) calibrated to isobutylene. <br /> <br />Upon sample retrieval, the acetate sleeve will be cut open to expose the entire soil core <br />to inspect and classify the soil. Soil samples collected between surface and 3-inches bsg <br />and at depths of 3, 5, 7, and 10 feet bsg will be hand-packed into sample jars. Soil <br />samples collected at 10 feet bsg will be held at the laboratory for potential PCB analysis, <br />if necessary. Soil samples collected at 10 feet bsg will be analyzed if PCBs are detected <br />in the 7-foot samples. Sample jars will be labeled with soil boring location, depth, time, <br />date and sampler's initials and then placed in a container with sufficient ice and <br />transported under chain-of-custody procedure to a California ELAP-certified laboratory. <br /> <br />Proposed soil boring locations are illustrated in Figure 3. <br /> <br /> <br />CONCRETE SAMPLE COLLECTION <br /> <br />Concrete samples will be collected from two locations at the subject property where <br />discolored concrete was observed during the February 2020 site meeting. One concrete <br />sample will be collected from the gas turbine package location and one sample will be <br />collected from the HRSG location. <br /> <br />Samples will be collected by utilizing a roto-hammer to remove a piece of concrete from <br />each concrete pad location. Concrete will be placed into sample jars, labeled with