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Table 1 Statistical Summary of Groundwater Concentrations at Monitoring Locations Lincoln Center,California Concentration Trend x PCE TCE cis-1,2-DCE Location ID GW Zone PCE TCE DCE Cr(VI) KM1104 Total Number Percent Total Number Percent Total Number Percent samples Detects ND samples Detects ND samples Detects ND MW-128A A Probably Decreasing Decreasing Decreasing Increasing Stable 5 2 60% 5 2 60% 5 3 40% Insufficient MW-129A A Stable Stable Stable No Trend Data 33 1 13 61% 33 12 64% 33 12 64% MW-20313-1 B Decreasing Decreasing Decreasing 37 21 43% 37 19 49% 37 22 41% MW-20313-2 B Decreasing Decreasing Decreasing 27 11 59% 27 13 52% 27 13 52% MW-20313-3 B Decreasing Decreasing Decreasing 27 1 96% 27 6 78% 27 6 78% MW-204B B Probably No Trend Decreasing Decreasing 62 59 5% 62 56 10% 62 56 10% MW-205B B Decreasing Decreasing No Trend Increasing Stable 25 2 1 92% 25 9 64% 25 1 7 72% MW-206B B Insufficient Decreasing No Trend Decreasing Increasing Data 39 13 67% 39 17 56% 39 21 46% MW-208B B Decreasing Decreasing No Trend 30 23 23% 30 19 37% 30 21 30% MW-209B B Decreasing Stable Increasing 29 3 90% 29 29 0% 29 29 0% MW-210B B Decreasing Increasing Increasing 28 16 43% 28 14 50% 28 14 50% MW-211B B Stable Increasing Increasing 33 33 0% 33 33 0% 33 33 0% MW-214B B Decreasing Decreasing Increasing Increasing Stable 18 18 0% 18 18 0% 18 18 0% MW-215B B Decreasing Decreasing Decreasing Increasing Stable 5 2 60% 5 4 20% 5 5 0% MW-217B B Stable Stable Increasing 6 5 17% 6 6 0% 6 6 0% MW-219B B Probably Stable Decreasing Decreasing 40 8 80% 40 3 93% 40 4 90% MW-301C C No Trend Decreasing Decreasing 55 48 13% 55 42 24% 55 43 22% Abbreviations: GW Zone=Ground water zone PCE=Tetrachloroethene WE=Trichloroethene DCE=cis-1,2-Dichloroethene Cr(VI)=Hexavalent chromium KMnO<=Potassium Permanganate ND=non-detects *=concentration trends determined using Mann-Kendall Statistics and includes concentrations reported at the laboratory reporting limits. --=data not available