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T GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Numbe Date (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (u91L) (ug/L) (ug1L) (ug/L) (ug1L) (ug/L) (ug/L)(ug/L (feet) (feet nisi) (feet msl) Comments MW-5 03/31198 <50 40.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 61.11 25.11 -36.00 screened 06110198 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no na na no no no na 58.41 -33.30 no odor/no sheen interval 09108/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 <0.50 <5,0 <50 <5.0 no no 58.41 -33.30 no odor/no sheen 65'-46.5' 12130198 i <50 40.50 2.5 0.89 5.8 45.0 na na no no no no na no 56.51 -31.40 no odor Inosheen 03125199 <50 <0.50 <0.50 40.50 <0.50 40.50 <0W <0.50 <0.50 <5.0 <50 <5A no no 54.54 -29.43 no comment 06103M <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 45.0 .40.50 <0.50 53.89 -26.78 no comment 08/30139 95 1.7 7.4 2.1 15 <0.50 40.50 <0.50 <0.50 45.0 <50 <5.0 <0.50 <0.50 56.04 -30.93 no comment 12110199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 40.50 <0.50 55.99 30.88 no comment 03103100 <50 <0.50 0.51 <0.50 0.92 <0.50 <0.50 <0.50 <0.50 45.0 <50 6.0 <0.50 40.50 54.53 29.42 no odorino sheen 06/22100 450 <0.50 40.50 <0.50 <0.50 40.50 <0.50 40.50 <0.50 <5.0 <50 24 <0.50 <0.50 53.75 -28.64 no odorloo sheen 09128M <50 <0.50 <0.50 <0.50 <0.50 <5.0 na no no no no no no no 56.19 -31.08 no odorino sheen 12/21100 450 <0.50 <0.50 <0,50 40,50 <5.o na no na no na na na na 55.32 -30.21 no odor/no sheen 03128101 78 2.5 14 2.1 11 45.0 no no no no no no no no 54.44 -29.33 no odor/no sheen 06!27101 <50 <0.50 0.68 40.50 40.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 40.50 <0.50 55.89 -30.78 no odor/no sheen 09AMI <50 0.64 1.1 0.70 2.0 <5.0 no no no no no no no no 57.96 -32.85 no odor/no sheen 12103101 <50 <0.50 1.1 40.50 <0.50 <5.0 no na no na no no no no 58.45 -33.34 no odorloo sheen 02!28!02 <50 <0.50 0.55 40,50 <0.50 <5.0 na na na na na no na no 57.31 -32.20 no odor/no sheen 0520!02 220 11 14 6,4 31 40.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 40-50 57.53 27.10 -30.43 no odorino sheen 0829102 <50 <0.50 <0.50 40.50 0.56 <5.0 no na no no na no no no 60.53 -33.43 no odorloo sheen 12106/02 450 0.73 1.7 <0.50 1.5 <0.50 no na no na no no no no 60.71 -33.61 no odor/no sheen 03105!03 <50 <0.50 <0.50 <0,50 <0.50 <5.0 na no na no no na no no 59.67 -32.77 no odor/no sheen 06/03/03 2100 <0.50 <0.50 <0.50 <0.50 0.57 <0.50 <0.50 <0.50 <5.0 <50 <5.0 4.2 40.50 56.71 -31.61 no odor/no sheen 0828103 <50 <0.50 0,68 40.50 1.2 <5.0 no no no no no no no no 60.98 -33.88 no odor/no sheen 1125103 ns ns ns ns ns ns ns ns ns n$ ns ns ns ns 81.81 -34.71 not sampled 03101/04 630 7.4 16 3.3 29 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 60.50 25.05 -35.45 no odor/no sheen 06/18104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61.01 -35.96 not sampled MW-6 03!31198 7WW 23000 8500 1100 6300 4500 no no no no no no na no 61.43 25.44 -35.99 reported as MW-2A screened 06!10198 120000 23000 17000 1600 15000 <5W no no no no no no no no 58.69 -33.25 reporled as MW-2A Interval 09/38/98 120000 30000 20000 2300 16000 40.50 40.50 40.50 40.50 4$.0 450 45.0 na na 58.77 -33.33 odor 1 no sheen 54'-74' 12fd0198 71000 20000 6500 1900 11000 <250 no no na no no no no no 56.85 -31.41 slight odor Inosheen 03/25199 48000 15000 1800 910 5100 <0.50 <0.50 <0.50 <0.50 20 <50 56 no no 54.86 -29.42 no comment 06103199 33000 9600 2500 1100 5400 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 <5.0 10 54.14 -28.70 no comment 08130!99 51000 7200 5400 2400 11000 42 <20 <20 <20 <200 <2000 <200 32 56 56.32 -30.88 no comment 12/10199 67000 13000 2400 1800 95W <20 <20 <20 <20 <200 <60 <200 68 46 56.29 -30.85 no comment 03/03100 28000 6000 280 570 3600 <20 <20 <20 <20 <200 <50 <200 <20 <20 54.89 -29.45 no odor/no sheen 0622100 2WW 6500 570 710 2900 <10 410 <10 <10 <100 <1000 <100 <10 <10 54.11 -28.67 slight odor I no sheen 0928100 30000 920 5300 830 6900 <5.0 no no no no no no no no 56.47 -31.03 slight odorino sheen 1222100 55000 9600 950 1600 8300 <200 na no no na na na na no 55.72 .30.28 odor 1 no sheen 0328!01 92000 15000 6600 2800 13000 <50 no no na no no no no no 54.68 -29.24 odor Inosheen 06/27/01 86000 15000 89W 2600 12000 <50 <50 <50 <50 <500 <5000 <1000 94 130 56.17 -30,73 odor/no sheen 09/08101 95000 17000 11000 2600 12000 <500 na no no no no na no na 58.20 -32.76 odor/no sheen 1204101 74000 14000 4600 2300 10000 <500 no no no no no no no no 58.81 -33.37 odor/no sheen 03/01/02 90000 13000 8300 2700 12000 <500 no na no no no na no na 57.61 -32,17 odor 1 no sheen 0520102 81000 14DW 6200 2100 100W 4100 <100 <100 <IDO 41000 <10000 <100-0 <100 <100 57.85 27.39 -30.46 odor 1 no sheen OSId0102 77000 13DW 6800 1600 8800 <1000 no no no no no no no na 60.90 -33.51 odor I no sheen 12/06/02 75000 16000 1900 2100 11000 <50 no na na no no na na na 60.96 -33.59 odor I no sheen 03/07/03 47000 8500 1400 1900 4800 <500 no no no no no no no na 59.99 -32.60 odor I no sheen 06/03/03 37000 5300 830 1600 3200 <25 <25 425 <25 <250 <25W <250 <25 <25 57.84 -30.45 odor/no sheen 0829103 86000 15000 2200 2300 11000 4500 na na na na na no no na 81.33 -33.94 no odor/no sheen 1125+03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62.06 -34.67 not sampled 03/01104 ns ns no ns ns ns ns ns ns ns no ns no ns nm 25.23 nm not sampled 06/011/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61.19 .35.96 not sampled 474QMfWrid5 Project No.1474.4 Page 3 of 11 HORIZON ERVIRONMERTAL INC.