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h � - <br /> 4 <br /> BLACK & VEATCH Waste Science, Inc. <br /> 2300 Clayton Road,Suite 1280,Concord,CA 94520, Phone:(510)246-8010 Fax: (510)246-8082 <br /> East Bay Municipal Utility District BVWS Project 40429.601 <br /> Stockton Service Center BVWS File C.3 <br /> February 3, 1995 <br /> » <br /> -n -nom <br /> Patricia Leary 70- <br /> California Regional Water Quality Control Board s =r <br /> Central Valley Region <br /> 3443 Routier Road, Suite A ro vw <br /> Sacramento, California 95827-3098 <br /> ern <br /> - Subject: Bioremediation Bench Scale Test w <br /> Residual Nitrogen Results <br /> Dear Ms. Leary: <br /> In response to your concerns about introducing nitrogen into the <br /> groundwater during the proposed bioremediation at the East Bay Municipal <br /> Utility District' s Stockton Service Center, BLACK & VEATCH Waste Science, <br /> Inc. performed a bench scale test. The bench scale test is discussed in <br /> Section 2.3 of the Remedial Action Plan (RAP) for the Stockton Service <br /> Center submitted to your office in September 1994. A groundwater sample <br /> was collected from MW-8 at the Stockton Service Center and submitted to <br /> ETI/Chugach, L.L.C. for the bench scale test. The groundwater sample was <br /> exposed to the ETEC multi-enzyme complex and a sample was collected from <br /> the effluent. This sample was submitted to Hughes Analytical Laboratory <br /> for nitrate, nitrite, ammonia, and Total Kjeldahl Nitrogen (TKN) . The <br /> results of these analyses are attached. <br /> A sample was also collected from a groundwater monitoring well upgradient <br /> of the plume and submitted to Curtis & Tompkins, Ltd. for nitrate, nitrite, <br /> ammonia, and TKN analyses. The results of these analyses are attached. <br /> The comparison of these two sets of results indicates that an increase in <br /> the concentrations of ammonia and TKN have occurred through the <br /> bioremediation process. Nitrate and nitrite were not detected in either <br /> sample although the detection limit used in the bench scale test sample was <br /> higher than that of the upgradient sample. According to the laboratory, <br /> this is because of matrix interference. <br /> The nitrate, nitrite, and ammonia levels are all less than California and <br /> federal water quality goals. Because TO represents a comprehensive <br /> quantification of nitrogen from.all compounds containing nitrogen in the <br /> 9582 <br /> 40429601\st kb res.wp5 <br /> i <br />