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GROUND WATER INVESTIGATION WORK PLAN <br />BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA <br />3.1.2.1 Boring and Sampling Locations <br />Twelve boring locations (C-1 through C-12; Figure 5) have been located to characterize the site <br />based on (1) presumed local shallow ground water gradient, and (2) historical and current bulk <br />commodity storage locations, as discussed below. <br />Bay Sulfur Storage Compound and Impoundment <br />Borings C-1 and C-2 are located downgradient with respect to the Bay Sulfur operations, <br />and boring C-12 is located adjacent to the presumed upgradient edge of Bay Sulfur <br />operations. Ground water samples collected from these borings and from MW-2 and MW-3 <br />will characterize presumed downgradient extent of sulfates in ground water samples, and <br />provide data for the siting of presumed downgradient sentinel wells. Soil samples will be <br />collected from boring C-12 to characterize the vertical extent of sulfur in vadose zone. <br />Southeastern Petroleum Coke Stockpile Areas <br />Borings C-2, C-3, C-4 and C-5 are sited to characterize ground water presumed <br />downgradient from potential petroleum hydrocarbon, nickel and vanadium sources in the <br />southeastern petroleum coke stockpile areas (nickel and vanadium are byproducts of <br />petroleum coke manufacture), as well as to augment data from existing monitor well MW-4. <br />Soil samples will be collected from borings C-3 and C-4, adjacent to the stockpiles, to <br />characterize vadose zone soil. Borings C-3 and C-4 also provide soil and ground water <br />quality characterization in the vicinity of the conveyor system. <br />Northern (Dock 13) Stockpile Area <br />Borings C-7 and C-8 are sited to characterize ground water quality presumed downgradient <br />from the potential petroleum hydrocarbon, nickel and vanadium sources at the northern <br />coal and coke stockpile area, as well as providing presumed upgradient comparative data <br />for the existing monitor wells MW-1 through MW-4. Soil samples will be collected from <br />borings C-7 and C-8 adjacent to the stockpile, to characterize vadose zone soil. Boring C-8 <br />also provides soil and ground water quality characterization in the vicinity of the conveyor <br />system. <br />H.J. Baker Sulfur Stockpile Area <br />Borings C-10 and C-11 are sited to characterize ground water quality presumed <br />downgradient from the H.J. Baker sulfur prill stockpile area, and are anticipated to indicate <br />whether or not impacts to shallow ground water have occurred. <br />Metropolitan Stevedore Copper Concentrate Transfer Area <br />Boring C-12 is located to characterize vadose zone soils in the historical copper concentrate <br />transfer area, as well as to assess impacts (if any) to ground water from transfer of copper <br />July 2005 Page 9 Environmental Risk Services Corp.