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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 3641 1210 E. Hammer Lane, Stockton, California ethyl- Depth to TOC GW Well TPP benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u A u /I (ug/1) (ug/l (ug/1) u 1l (ug/1) (ug/1) (Ug/1) (ug/1) u ll (u11)( (ug/1) (ug/1) feet feet msl feet msl Comments 5W-1 1012197 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 56.57 nm nm not sampled screened 3131198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.23 nm not sampled interval 6/10198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 45.84 nm not sampled 60'-65' 918198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.26 nm not sampled 12130/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 43.99 nm not sampled 3125199 90 <0.50 0.71 <0.50 0.53 71 <0.50 <0.50 0.55 <5.0 <50 <5.0 ns ns 41.95 nm slight odor/no sheen 612199 130 0.89 <0.50 <0.50 <0.50 130 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 42.24 nm slight odor/no sheen 8/31199 1000 150 53 45 31 1400 <0.50 <0.50 0.65 54 <100 <5.0 <0.50 <0.50 47.81 nm no comment 12!9199 53 <0.50 <0.50 <0.50 <0.50 500 <0.50 <0.50 <0.50 5.4 <50 <5.0 <0.50 <0.50 44.60 nm no comment 311100 <200 <2.0 <2.0 <2.0 <2.0 560 <2.0 <2.0 <2.0 <20 <300 <20 na na 42.38 nm no comment 6/6100 60 2.2 <0.50 <0.50 <0.50 510 <0.50 <0.50 <0.50 28 . <200 <5.0 <0.50 <0.50 41.79 nm clear 9114100 940 95 5.8 53 3.6 3100 <2.0 <2.0 <2.0 76 <250 <20 <2.0 <2.0 47.90 nm clear 12/12/00 <200 <2.0 <2.0 <2.0 <2.0 1900 na na na na na na na na 43.99 nm clear 3119101 <100 <1.0 <1.0 <1.0 <1.0 470 na na na na na na na na 41.96 nm clear 6119/01 <100 12 10 2.4 6.0 540 na na na na na na na na 45.15 nm clear 9/27101 520 <2.0 2.4 13 9.5 2000 na na na na na na na na 49.95 nm clear 12/13/01 <250 <2.5 <2.5 <2.5 7.3 1800 na na na na na na na na 46.16 nm clear 3/28102 <500 <5.0 <5.0 <5.0 <5.0 1900 na na na na na na na na 42.98 19.24 -23.74 clear 6119102 630 160 17 52 25 1700 na na na na na na na na 45.70 -26.46 clear 9116/02 770 82 6.4 77 15 2100 <5.0 <5.0 <5.0 59 <500 <50 <5.0 <5.0 50.72 -31.48 cloudy 12/26/02 <1000 <10 <10 <10 12 2600 na na na na na na na na 47.03 -27.79 cloudy 3126/03 520 51 71 7.1 36 2000 na na na na na na na na 44.83 -25.59 clear 6127/03 1800 550 13 89 13 4200 <10 <10 <10 <100 <1000 <100 <10 na 47.80 -28.56 clear 9119103 570 60 <5.0 9.2 <5.0 2900 na na na na na na na na 54.16 -34.92 clear 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.25 -30.01 clear 3/26104 <500 <3.0 <3.0 <3.0 <3.0 1500 <3.0 <3.0 <3.0 <50 <500 <50 <3:0 na 47.20 -27.96 clear 6/17104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.90 -32.66 not sampled 919104 13000 150 <10 <10 53 2900 <10 <10 <10 100 J <1000 <100 <10 na 57.06 -37.82 clear 12/16/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 53.41 -34.17 not sampled 313105 15000 <2.5 2.7 <2.5 <2.5 1500 <2.5 <2.5 <2.5 <25 <250 <25 <2.5 na 49.80 -30.55 clear 6116105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.86 -30.62 not sampled 8129105 140077 <2.5 22 7.3 1100 na na na na na na na na 54.19 -34.95 clear 12/29/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ni 48.30 -29.06 not sampled Project 1�"A641.48 P oet'of 13 HORIZON ENVIRONMi�:k�'t'AL INC.