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GEOMATRIX TABLE 2 CALCULATION OF REPRESENTATIVE CONCENTRATIONS IN GRAB GROUNDWATER Pombo Property 1755 West 11th Street Tracy,Califorina Concentrations in micrograms per liter(pg/1) Sample Ethyl- Acenap- Benz(a) Fluoran- Phenan- Sample 1D Date Benzene Toluene benzene Xylenes MTBE thene anthracene Chrysene thene Flu orene N.pthalene threne Pyrene GMX-6-GGW 9/22/99 -0.5 -0.5 -0.5 -0.5 -1 -0.1 -0.1 -0.1 -0.1 0.2 -0.1 0.3 _01 GMX-25-GGW 5/16/00 -0.5 -0.5 -0.5 -0.5 NA -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 41 -0.1 GMX-29-GGW 10/12/00 0.6 2.6 1.6 4 NA -0.1 -0.1 -0.1 -0.1 0.1 -0.1 0.1 -0.1 GMX-30-GGW 10/12/00 -0.5 0.8 -0.5 1.1 NA -0.1 -0.1 -0.1 -0.1 -0.1 -O.l.. -0.i -0.1 GMX-3I-GGW 10/12/00 -0.5 -0.5 -0.5 1.9 NA -0.1 -0.1 O.I -0.1 -0.1 -0.1 -0.1 -0.1 GMX-33-GGW 10/13/00 -0.5 -0.5 -0.5 -0.5 NA -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Count(n) 6 6 6 6 1 6 6 6 6. 6 6 6 G Detections 1 2 1 3 0 0 0 0 0 2 0 2 p Nun-detects 5 4 5 3 1 6 6 6 6 4 6 4 6 Minimum Detected Value 0.6 0.8 1.6 1.1 0 0 4 0 0 0.1 0 0.1 0 Maximum Detected Value 0.6 2.6 1.6 4 0 0 0 0 0 0.2 0 0.3 0 Minimum Detection Limit 0.5 0.5 OS 0.5 1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Maximum Detection Limit 0.5 0.5 0.5 0.5 1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Mcan(x) 0.3 0.7 0.5 1.3 ND ND ND ND ND 0.1 ND 0.1 ND Standard Deviation(sd) 0.14 0.94 0.55 1.48 0.00 0.00 0.00 0.00 0.00 0.06 0.00 0.l0 0.00 t value(t) 2.02 2.02 2.02 2.02 ND 2.02 2.02 2.02 2.02 2.02 2.02 2.02 2.02 45%UCL' 0.43 1.5 0.93 2.5 ND ND ND ND ND 0.13 ND 0.18 ND 95%UCL calculated as follows: z+sd x t/ NA=Not Analyzed; ND=Not Detected Negative value denotes that the sample was not detected above the laboratory detection limit. i:\project\7000&\7243.001\pombo\data calcs.xls