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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 TPHg benzene toluene benzene xylenes MTBE DIRE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/1) (ug/1) (ug/1) (ug/1) u ll ug/1)( (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (u 11)( (ug/1) feet feet msl feet msl Comments VW-1 3125199 20000 4000 2000 900 1700 3000 <5.0 <5.0 <5.0 <5.0 <50 640 na na 41.70 nm nm slight odor/no sheen screened 612199 23000 5800 2300 1100 1900 8300 <5.0 <5.0 <5.0 240 <100 I <10 <5.0 <5.0 42.21 nm slight odor I no sheen interval 8131199 50000 14000 11000 2300 6200 20000 <5.0 <5.0 7.2 770 <2500 <50 <5.0 <5.0 47.31 nm no comment 44'-54' 1219199 26000 3300 1900 . 880 2600 8800 <5.0 <5.0 <5.0 120 <500 <50 <5.0 <5.0 45.20 nm no comment 3/1100 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 na na 42.46 nm no comment 616100 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 41.76 nm clear 9114/00 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 47.90 nm clear 12/12/00 21000 4000 2900 690 1800 6300 na na na na na na na na 44.23 nm clear 3119101 9400 2600 600 430 290 6100 na na na na na na na na 41.72 nm clear 6119101 67000 13000 8500 1600 6500 17000 na na na na na na na na 44.03 nm clear 9127101 16000 3300 840 640 1400 5500 na na na na na na na na 50.04 nm clear 12/13/01 84000 12000 8600 2100 10000 19000 na na na na na na na na 46.55 nm clear 3128102 38000 5800 4400 1100 4800 8900 na na na na na na na na 43.42 19.53 -23.89 clear 6119/02 37000 6800 2900 1400 3800 13000 na na na na na na na na 45.10 -25.57 clear 9116102 56000 7000 2200 1500 5100 14000 <50 <50 <50 <500 <5000 <500 <50 <50 50.33 -30.80 clear 12/26/02 110000 11000 10000 2400 12000 20000 na na na na na na na na 47.85 -28.32 clear 3126/03 33000 3100 1600 1300 4400 7000 na na na na na na na na 45.15 -25.62 clear 6127103 8400 1300 240 300 550 6100 <10 <10 <10 <100 <1000 <100 <10 na 47.11 -27.58 clear 9119103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.78 -30.25 clear 3126104 140000 13000 14000 3600 18000 25000 <50 <50 <50 <500 <5000 <500 <50 na 47.31 -27.78 clear 6/17104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.28 -31.75 not sampled 919104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/16/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 313105 51000 1700 210 840 5800 6800 <20 <20 <20 2500 <2000 <200 <20 na 47.15 -27.62 odor/no sheen 6116105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.28 -29.75 not sampled 8129105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry not sampled 641 gmr.xls Project No.1641.48 Page 10 of 13 HORIZON ENVIRONMENTAL.INC.