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s • • TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHgenzenetoluene benzenexylene MTBE DIPE ETBE TAME TBA methanolethano! EDC EDB GW Elevation Elevation Number Date (u 1L u 1L u 1L (ug/L} (ug/L (ug/L} (ug/L u 1L) (u 1L) (u !L) ((u21L) u 1L) (u 1L) ((ug/L feet feet msl feet msl Comments MW-7 03/31/98 <50 <0.50 <0,50 <0.50 <0,50 <5.o na na na na na na 61.75 25.66 -36.09 screened 06/10198 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 59.04 -33.38 no odor 1 no sheen interval 09/08/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59.19 -33.53 no odor 1 no sheen 56'-76' 12/30198 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 57.18 -31.52 no odor 1 no sheen 03125/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <o,5o <0.50 6.0 <50 <5.0 55.07 -29.41 no comment 06/03/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.6 <0.50 54.61 -28.95 no comment 08/30199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <5.o <50 <5.0 2.1 <0.50 56.85 -31.19 no comment 12/10/99 <50 <0.50 <0.50 <0.50 <0.50 0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 4.7 <0.50 56.68 -31.02 no comment 03/03100 <50 <0.50 <0.50 <0-50 <0.50 0.62 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.0 <0.50 55.61 -29.95 no odor/no sheen 06/26/00 <50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 9.4 40 <0.50 54.62 -28.96 no ododno sheen 09/28/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.93 -31.27 no odor/no sheen MW-8 03/31/98 100 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.51 25.68 -35.83 reported as MW-3A screened 06110/98 80 0.9 <0.50 <0.50 <0.50 <5.0 na na na na na na 58.86 -33.18 reported as MW-3A interval 09108198 79 0.57 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 58.97 -33.29 slight odor 1 no sheen 56'-76' 12/30/98 51 2.4 0.69 <0.50 <0.50 <5.0 na na na na na na 57.13 -31.45 slight odor I no sheen 03125/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.09 -29.41 no comment 06/03199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 54.42 -28.74 no comment 08/30/99 <50 0.67 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.60 -30.92 no comment 12110/99 330 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 5.1 <50 <10 0.51 <0.50 56.57 -30.89 no comment 03/03/00 <50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5A <0.50 <0.50 55.28 -29.60 no ododno sheen 06/22/00 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 12 0.63 <0.50 54.37 -28.69 no odorino sheen 09/28/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.75 -31.07 no ododno sheen MW-9 03/31/98 <50 <0,50 <0.50 <0.50 <0.50 <5.0 na na na na na na 62.59 26.58 -36.01 reported as MW-1A screened 06/10/98 66 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 59.91 -33.33 reported as MW-1A interval 09/08/98 <50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59.99 -33.41 no odor 1 no sheen 56'-76' 12/30198 <50 Q.50 <0.50 <0.50 <0.50 <0.50 na na na na na na 58.01 -31.43 no odor 1 no sheen 03/25/99 <50. <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 56.02 -29.44 no comment 06103/99 92 <0,50 <0.50 1.0 5.7 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.3 <0.50 55.43 -28,85 no comment 08/30/99 58 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.66 <0.50 57.68 -31.10 no comment 12/10199 140 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.81 <0.50 57.49 -30.91 no comment 03/03/00 75 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.99 <0.50 56.54 -29.96 no ododno sheen 06/26/00 73 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 10 <0.50 <0.50 55.41 -28.83 no odorino sheen 09/28/00 <50 <0.50 <0.50 Q.50 <0.50 <5.0 na na na na na na na na 57.74 -31.16 no odor/no sheen 474gmr00As 1474.43 Page 3 of 5 HORIZON ENVIRONMENTAL INC.