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GROUND WATER INVESTIGATION WORK PLAN <br />BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA <br />INTRODUCTION <br />Environmental Risk Services, Corporation (ERS) has prepared this Ground Water Investigation <br />Work Plan (Work Plan) on behalf of the Port of Stockton (Port), Metropolitan Stevedore <br />Company (Metropolitan), H.J. Baker & Bro., Inc. (Baker), and Bay Sulfur Company (Bay Sulfur) <br />facilities, Port of Stockton, Stockton, California ("bulk terminals site"). This Work Plan was <br />prepared pursuant the Regional Water Quality Control Board — Central Valley Region (Regional <br />Board) letter, dated April 12, 2005, based on their inspection of facilities performed on March 30, <br />2005, and follow-up letter dated June 2, 2005. Observations recorded by the Regional Board <br />during their inspection include low pH and high electrical conductivity in storm water, drift <br />from the sulfur prill product stockpiles, and increased concentrations of sulfate, sulfur, total <br />dissolved solids (TDS), and increased electrical conductivity in ground water monitor wells. <br />Based on their inspection, the Regional Board expressed concerns regarding potential impacts <br />to ground water due to acidic conditions associated with the current storage of sulfur prill and <br />previous ground storage of sulfur prill, coal, copper concentrate, and petroleum coke. <br />This Work Plan describes methods to assess the lateral and vertical extent of ground water <br />impacts, if any, associated with the current and/or former bulk commodity stockpiling and/or <br />handling of sulfur prill, copper concentrate, coal, and petroleum coke. <br />BACKGROUND AND PREVIOUS INVESTIGATION <br />The Port of Stockton bulk terminals site is located within the Port's East Complex (Figure 1), <br />east of the San Joaquin River where it flows into the Stockton Deep Water Channel (Figure 2). <br />The site extends approximately 2,500 feet north-to-south, parallel to the San Joaquin River, and <br />approximately 2,500 feet east-to-west. The site is nearly flat at an elevation of approximately <br />five to six feet above mean sea level (msl). <br />2.1 OPERATION OF THE BULK TERMINALS SITE <br />Bulk materials currently and/or historically stored at the bulk terminals site include: <br />sulfur prill, <br />coal, <br />petroleum coke, <br />July 2005 Page 1 Environmental Risk Services Corp.