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Sequoia Analytical is certified by the State of California for the analyses performed. The soil <br /> samples were analyzed for: <br /> ' • Nitrate as N(EPA 300); <br /> • Ammonia as AN(EPA 351.2); and <br /> ' • Total Kjeldahl Nitrogen(TKN) (EPA 350.3M) <br /> ' ANALYTICAL RESULTS <br /> ' Backeround <br /> • TKN was detected at 980 mg/kg (ppm) in the sample obtained from 0 to 0.5 feet bgs, which <br /> ' decreased to 730 mg/kg in the sample obtained from 1 to 1.5 feet bgs. From 3 to 3.5 feet bgs <br /> it increased to 960 mg/kg, and from 5 to 5.5 feet bgs it increased to 1,000 mg/kg. <br /> • Nitrate as N was detected at 9.5 mg/kg in the sample obtained from 0 to 0.5 feet bgs, which <br /> ' decreased to not detected above laboratory reporting limits (ND) in the samples obtained <br /> from 1 to 1.5 and 3 to 3.5 feet bgs. Nitrate was detected at 8.2 mg/kg in the sample obtained <br /> from 5 to 5.5 feet bgs. <br /> ' • Ammonia as AN was not detected above laboratory reporting limits (ND) in the sample <br /> obtained from 0 to 0.5 feet bgs, which increased to 8.5 mg/kg in the sample obtained from 1 <br /> to 1.5 feet bgs and 5.0 mg/kg in the sample from 3 to 3.5 feet bgs. Ammonia was not <br /> ' detected above laboratory reporting limits (ND) in the sample obtained from 5 to 5.5 feet bgs. <br /> ' Former Bulk Tank Farm Area <br /> Concentrations for the three constituents both increased and decreased with depth, in the <br /> ' Geoprobe boring locations. <br /> • TKN concentrations ranged from 120 to 5,200 mg/kg (ppm). Concentrations both increased <br /> and decreased with depth. <br /> t • Nitrate as N concentrations ranged from not detected above laboratory reporting limits (ND) <br /> to 1,600 mg/kg. Concentrations both increased and decreased with depth. <br /> ' • Ammonia as AN concentrations ranged from not detected above laboratory reporting limits <br /> (ND)to 2,500 mg/kg. Concentrations both increased and decreased with depth. <br /> ' Analytical results for April 3, 2002 Geoprobe sampling are summarized and presented in <br /> Table 1. Copies of analytical laboratory reports and chain-of-custody forms are included in <br /> Appendix B. Appendix C contains isoconcentration contour plots for the three constituents at <br /> ' four depth intervals. <br /> ' 23485060-1\SAC2R335 Page 3 of 5 July 30,2002 <br /> Copyright 2002 Kleinfelder,Inc. <br /> KLEINFELDER 3077 Fite Circle,Sacramento,.CA 9-592-7-1815-- (916)366-1701 (916)36b-7013 fax <br /> _ I <br />