Laserfiche WebLink
S <br /> of total copper, zinc, and mercury in the soil samples from the former ship-building yard <br /> were slightly elevated relative to the rrmainâ–șng samples, and slightly exceeded the average <br /> range of metal concentrations in soil (Bohn, et a1.,1979). Concentrations of the remaining <br /> priority pollutant metals in the soil samples were generally within the average range of <br /> metal concentrations in soil, and volatile organics were not detected in any of the soil <br /> samples. In the water samples, concentrations of arsenic (in wells MW-4 and MW-8), and <br /> concentrations of barium, chromium (III), and selenium (in wells MW-1 and MW-2) <br /> exceeded their respective MCLS, and a small amount of acetone in well MW-4 (suspected <br /> laboratory contaminant) was the only volatile organic detected in any of the nine wells. <br /> In August 1992, additional limited ground-water monitoring was conducted to follow up <br /> findings of previous site investigations. Samples from all nine site wells were analyzed for <br /> priority pollutant metals and samples from two of these wells (MW-1 and MW-4) were <br /> analyzed for volatile organics (EPA Method 8240). The results of this limited investigation <br /> (RESNA, September 1992) indicated that the concentrations of one or more of the metals <br /> arsenic, barium, selenium, and zinc exceeded their respective MCLS in some wells. <br /> However, volatile organics were not detected in either well MW-1 or MW-4, which indicated <br /> the previously-detected acetone in these two wells was related to laboratory contamination. <br /> Due to the several indications of site impacts from historic activities, LSCE conducted a soil <br /> gas sampling investigation on the parcel in April 1993 to provide a broader screening for <br /> volatile and semi-volatile organics in soil and ground water. The results of the soil-gas <br /> sampling investigation (LSCS, June 1993) indicated four groups of petroleum-related <br /> hydrocarbons (or possibly coating or treating products) were present in two general areas on <br /> the Banner Island property. The four groups were: 1) light aromatics (BTEX), 2) <br /> cycloalkanes and alkenes (Ca - Cll weight range), 3) various naphthalenes, and 4) various <br /> common heavier-weight (Cla - Cu range) petroleum hydrocarbons. The two areas exhibiting <br /> volatile organic compounds (VOCs) in soil gas were the former ship building yard and an <br /> area located generally southwesterly of the former ship building and steel fabrication shop <br /> (Figure 4). <br />