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GROUND WATER INVESTIGATION WORK PLAN BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA copper concentrate. The site is owned by the Port, which currently leases portions of the site to Metropolitan and Baker. Baker and Bay Sulfur currently stockpile and process bulk "sulfur prill" (a spherical solid sulfur product formed by a wet process involving contact of heated liquid sulfur with chilled water). Bay Sulfur subleases its facility from Metropolitan. Metropolitan loads Bay Sulfur's sulfur onto vessels. Metropolitan also unloads coal from railcars and transfers it to stockpiles maintained on adjacent properties leased from the Port by Air Products and POSDEF. Figure 2 depicts bulk products currently stockpiled at the site. Sulfur prill is currently stockpiled in two locations in the southwestern portion of the site, petroleum coke is currently stockpiled in the eastern area of the site, and coal is stockpiled in the northern area along the aboveground conveyor system easement. Two ship loading facilities are used at the bulk terminals area; one is owned and operated by Metropolitan (which loads Bay Sulfur's sulfur prill product) and the other is owned by the Port and operated by Stevedoring Services of America (which loads Baker's sulfur prill product). As shown on Figure 2, two conveyor systems are used across the site for transport of bulk materials to the dock. A tunnel conveyor system extends from within the Baker sulfur stockpile area, known as the "clay pit", to the dock. This tunnel conveyor system is partially underground, installed within a corrugated, galvanized tunnel. The tunnel has an access port within the clay pit, and extends northward under the surface approximately 400 feet. The conveyor comes to the surface in the vicinity of the Rice Terminals, north of the clay pit and continues aboveground to the dock (Figure 2). The tunnel conveyor is owned by the Port; it is not leased to Baker and Baker does not operate it. A second conveyor system extends along the southeastern perimeter of the site, crossing the bulk terminals site to the dock (Figure 2). Portions of this conveyor are elevated, and bulk materials are stockpiled beneath it. A central leg of this conveyor extends southward to the railcar dump in the center of the site, through an underground tunnel, and along the eastern perimeter of the Bay Sulfur containment area. Metropolitan owns and operates this conveyor system. Bay Sulfur and Metropolitan operate two storm water containment facilities located in the southern portion of the site (Figure 2). Bay Sulfur operates a storm water impoundment, which is a controlled retention basin lined with gunite and a hypalon interior liner. Water collected in this impoundment is not discharged, but pumped to a storage tank to be reused as process water. Although the controlled, lined impoundment is zero-discharge, Bay Sulfur does sample storm water in this vicinity during two storm events each year with results reported annually to the Regional Board under an Industrial Activities Storm Water General Permit. July 2005 Page 2 Environmental Risk Services Corp.