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III. Verification Soil and Ground-Water Investigation <br /> Following completion of the soil gas sampling investigation, it was recommended that <br /> limited verification investigative work be conducted to determine the concentrations of <br /> VOCs indicaizd to be present in soil and/or ground water. Further, the verification <br /> investigation was to resolve questions regarding the elevated soil metal concentrations in the <br /> ship-building yard area <br /> Procedures <br /> On July 26 and 27, 1993, LSCE constructed four soil borings on the parcel (Figure 4) to <br /> collect soil and gro*d-water samples, in accordance with the workplan (LSCE, June 1993) <br /> approved by the San-Joaquin County Environmental Health Department. The,,,borings were <br /> located within the two areas of highest soil gas fluxes of VOCs: three borings (B-1, B-2 and <br /> B-3) in the former ship-building yard and one boring (B-4) in the area southwest of the <br /> former ship-building and steel fabrication shop. Three shallow soil samples were collected <br /> from each boring between 1-1/2 feet to 5 feet in depth, and two additional deeper soil <br /> samples were collected from boring B-3 at 10 feet and 20 feet in depth. <br /> All soil samples were collected with a modified California split-spoon sampler in brass <br /> sleeves sealed with teflon sheets, caps, tape and ziplock baggies, before being placed on ice <br /> in an ice chest In addition, all soils were described according to the Unified Soil <br /> Classification System (USCS). Each boring was drilled to and partially into the water table, <br /> a HydroPunch was advanced three feet past the drill bit into a deeper portion of the shallow <br /> aquifer, and ground-water samples were collected by bailing from within the piping <br /> connected to the HydroPunch. All sample bottles were sealed with no head-space (and <br /> VOAs were also sealed in ziplock baggies) and placed on ice in an ice chest Soil and <br /> ground-water samples were transported to a certified laboratory under the prdeer chain-of- <br />