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WGR <br /> Soni tlhiw est, I ni c. <br /> GROUNDWATER ASSESSMENT TECHNICAL REPORT <br /> CALAMCO STOCKTON TERMINAL <br /> 2321 W.WASHINGTON STREET,SUITE E <br /> STOCKTON,CALIFORNIA 95203 <br /> August 28,2003 <br /> INTRODUCTION <br /> The subject property is the California Ammonia Company (CALAMCO) Stockton Terminal. The <br /> terminal is a cooperative outlet for farm and commercial grade ammonia. It is located within the <br /> Port of Stockton East Complex in Stockton, California(Figures 1 and 2). <br /> The purpose of this technical report is to propose a work plan to evaluate the impact of ammonia on <br /> local groundwater due to the April 18, 2003 accidental spill of approximately 5,500 gallons of <br /> ammonia hydroxide. This phase of investigative work has been proposed in response to an agency <br /> request for a technical report concerning how the discharger (CALAMCO) proposes to collect <br /> groundwater samples(Notice of Violation dated July 16,2003). <br /> SITE SETTING <br /> The site is located within the Port of Stockton East Complex, which is an industrial area adjacent to <br /> the Stockton Deep Water Channel. The property is owned by the Port of Stockton and is leased to <br /> CALAMCO. The facility consists of an off-loading dock (at Berth #8), tank farm, truck loading <br /> rack, and cold storage facility. Anhydrous ammonia and urea ammonia nitrate are received at Berth <br /> #8, transferred to the facility by pipeline, and stored in two 20,000-ton steel aboveground storage <br /> tanks and one 3,000-ton steel aboveground storage tank,respectively. <br /> SITE BACKGROUND <br /> On April 18, 2003 at 10:15 pm, the facility experienced a spill of approximately 5,500 gallons of <br /> ammonia hydroxide. CALAMCO blends one part anhydrous ammonia with three parts water to <br /> form ammonia hydroxide. The spill occurred during this process. The 3,000-ton ammonia <br /> hydroxide tank (aka aqua ammonia) over pressurized and ruptured at the top of the tank due to a <br /> pressure gauge malfunction. The tank farm secondary containment walls laterally contained the <br /> spilled product on the surface. Spilled ammonia hydroxide flowed to and accumulated at the <br /> southwest corner of the tank farm. No product entered the Port of Stockton storm drainage <br /> system or escaped from the tank farm. Clean up records indicate that nearly all of the estimated <br /> 5,500 gallons of spilled ammonia hydroxide was recovered. However, a shallow soil sample <br /> collected by the Central Valley Regional Water Quality Control Board (CVRWQCB) from the <br /> 725.PRI.00 1 August 28, 2003 <br />