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Table 1. Summary of Groundwater Elevation Data and Analytical Laboratory Results for Groundwater Samples Collected at Former E-Z Serve Station# 100878 - 1012 West Yosemite Avenue,Manteca,California - - - Well Depth Product Groundwater EPA Methods 8015 and 8020 - Date Elevation to Water Thickness Elevation Concentration IL Well I D Sampled feet feet s feet feet � TPH 1 Benzene Toluene lEthylbenzenei Xylenes -__ MW-5 1-Jul-92 9832 197-3 - 78 59 860 18 4 6 120 - 12-Sep-92 21 12 77 20 680 9 <1 26 68 23-Dec-92 19 05 79 27 1,300 39 7 43 110 3-Mar-93 15 66 82 66 730 120 22 64 130 4-Jul-93 19 93 78 39 4,700 550 84 360 240 -- 15-Sep-93 21 23 7709 740 27 <1 22 33 - - _ 21-Dec-93 1758 8074 4,700 240 490 330 1,500 - 2-May-94 16 83 81 49 1,100 140 <1 <1 122 15-Jul-94 17 81 80 51 4,300 160 280 190 800 27-Sep-94 19 92 7840 460 22 <1 27 34 _ 8 Dec-94 17 44 80 88 4,600 87 15 150 940 1 24-Mar-95 14 21 84 11 10,000 330 18 660 2,500 22-Jun-95 16 63 81 69 4,100 130 21 240 1,200 15-Sep-95 1930 7902 1,400 23 1 9 39 81 -- 12-Dec-95 17 29 81 03 12,000 180 8 6 250 1,600 - 22-Feb-96 --14 71 83 61 15,000 60 5 0 740 3,600 15-Apr-97 13.02 --- 6A0 43 - <5 --- 230 --1,4(10 MW-6 1-Jul-92 98 04 19 64 78 40 <100 <1 <1 -- - 12-Sep-92 21 03 77 01 <100 1 CI <1 <1 23-Dec-92 18 92 79 12 <100 <1 <1 3-Mar-93 15 58 8246 <100 <1 <1 <1 <1 _ 4-Jul-93 2000 78 04 260 28 120 4 _ 15-Sep-93 21 11 33 _ 76 93 <100 2 <1 1 <1 T- 21-Dec-93 17 40 80 64 <100 <1 <l <1 < 1 _ 2-May-94 16 72 81 32 <100 <1 <1 <1 <1 15-Jul-94 17 82 8022 2,600 96 560 80 440 27-Sep-94 19 87 7817 <I00 <1 C1 <1 < ! 7-Dec-94 17 27 80 77 100 <05 <05 <05 <0 5 _ 24-Mar-95 - 14 34 83 70 140 <05 <05 <0 5 <0 5 - _ 22-Jun-95 1651 ( 81 53 <50 <0 5 <0 5 <0 5 t -- i - _-c le_zsccvclEnblcs1100878 xle Page 4 of 6