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TABLE 1 GROUNDWATER MONITORING DATA s; Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPH9 benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation , Elevation Number Date u 1L u 1L u f! (ug/L u 1L (ug/L (ug/L u 1L (ug/L (ug/L u 1L (ug/L (ug/L (ug/L feet feet msi feet msIL Comments MW-9 03131/98 <50 <0.50' <0:60 <0.50 <0.50 <5.0 no no no no no no no no 62.59 26.58 -36.01 reported as MW-1A screened 06!10198 66 <0.50 c0 50 <0.50 <0.50 <5.0 no no no no no no na no 59.91 -33.33 reported as MW-1A Interval 09/08/98 450 <0.50 <0:50 <0.50 <050 40.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no no 59.99 -33.41 no odor/no sheen 56'-76' 12/30/98 <50. 40.50 <0.50 40.50 <0.50 <0.50 no na no na no no no no 58.01 -31.43 no odor!no sheen 03125/99 <60 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 450 <5.0 no no 56.02 -29.44 no comment 06/03199 92 <0,50' <0.50 1.0 5.7 <0.50 <0.50 <0.50 <0.50 <5.0 <50 45.0 5.3 <0.50 55.43 -28.85 no comment 08/30199 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 40.50 <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 odor 1 no sheen 06/26100 73 40.50 <D.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 odor/no sheen 09/28/00 <50 <0.50 450 <0.50 <0.50 <5.0 no no no no no no no no 57.74 -31.16 no odor/no sheen 12/22/00 210 <0.50 <0.50 <0.50 <0.50 <5.0 na no no no no no no no 56.89 -30.31 no odor 1 no sheen 03/28/01 140 2.9 14 1.4 6.1 <5.0 no no no no' no na no no 55.91 -29.33 no odor 1 no sheen 06/27101 200 :,<0.50 0;b1 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57.47 -30.89 no odor 1 no sheen 09106/01 120 '<0.50 40,50 <0.50 <0.50 <5.0 no no no no no na no no 59.52 -32.94 no Odor/no sheen 12/03/01 160 <0.50' 40.50 <0.50 <0.50 <5.0 no na na no no no na na 59.93 -33.35 no odor I no sheen 02128/02 160 40.50 11.3 40.50 <0.50 45.0 no no na na no na no no 58.76 -32.18 no odor 1 no sheen 05/20/02 140 40.50' 0.80 <0.50 <0.50 40.50 <0.50 <0.50 40.50 <5.0 <50 <5.0 <0.50 40.50 59.06 28.59 -30.47 no odor I no sheen 08/29/02 110 <0.50 <0.50 <0.50 <0.50 <5.0 na no no no no no no no 62.10 -33.51 no odor 1 no sheen 12 06102 250 40.50 <0.5o <0.50 <0.50 <0.50 no no no no na no na no 62.28 -33.69 no odor 1 no sheen 03/05/03 710 <0.50 <0.50 <0.50 c0.50 <5.0 no na na no no no no no 61.23 -32.64 no odor 1 no sheen 06103J03 2100 <0.50 0.60 <0.50 <0.50 0.89 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.4 <0.50 60.48 -31.89 no odor I no sheen 08/28/03 160 ;<0.5D <0 50 <0.50 <0.50 <5.0 no no no no na no no no 62.56 -33.97 no odor I no sheen 11/25/03 ns ? ns ns ns ns ns ns ns ns ns ns ns ns ns 63.32 ; -34.73 not sampled 03101/04 130 <0.50 0.57 X0.50 40.50 <0.50 <0:50 <0.50 <0.50 <5.0 <50 45.0. 40.50 <0.50 61.98 26.54 35.44 no odor 1 no sheen 06/08104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62.53 35.99 not sampled 09/09/04 340 '<0.5G' <0.5o <0.50 <0.50 <5.0 no na no no no na no no 64.19 -37.65 no odor 1 no sheen 12/08/04 ns ns ris ns ns ns ns ns ns ns ns ns ns ns 64.23 -37.69 not sampled 03/10/05 270 <0.50- 3.5o <0.50 0.88 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0. <0.50 <0.50 63.05 -36.51 no odor 1 no sheen 05125/05 ns I ns ds ns ns ns ns ns ns ns ns ns ns ns 61.90 -35.36 not sampled 09102/05 280. <0.50 40.50 40.50 40.50 <5.0 no no no no no no no no 62.72 36.18 no odor 1 no sheen ' 12114/05 ns t� ns ns ns ns ns ns ns ns ns ns ns ns ns 62.90 -36.36 not sampled i.• � I I i i - � I i; 474gm+05� Project No.1474.48 PageTbf 18 HORIZON WINUROKII&IRC. E