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TABLL l GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to Toc GW Well TPH9 benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (feet) (feet msl) (feet msl) Comments sW 1 10!02197 ns ns ns ns as ns ns ns ns ns ns ns ns ns 5657 nm nm not sampled screened 03/31/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51 23 nm not sampled interval 06110!98 ns ns ns ns ns ns as ns ns ns ns ns ns ns 4584 nm not sampled 60 65 09!08198 ns ns ns ns ns ns ns ns as ns ns no ns ns 4926 nm not sampled 12130198 ns ns as ns ns ns ns ns ns ns ns no ns ns 4399 nm not sampled 03125199 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <5 0 ns ns 41 95 nm slight odor I no sheen 06!02199 130 089 <0 50 <0 50 <0 50 130 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4224 nm slight odor I no sheen 08/31199 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <5 0 <0 50 <0 50 4781 nm no comment 12109199 53 <0 50 <0 50 <0 50 <0 50 500 <0 50 <O 50 <0 50 54 <50 <5 0 <0 50 <0 50 4460 nm no comment 03/01100 <2130 <2 0 <2 0 <2 0 <2 0 560 <2 0 <20 <2 D <20 <300 <20 no no 4238 nm no comment 06106100 60 22 <0 50 <0 50 <0 50 510 <0 50 <0 50 <0 50 28 <200 <5 0 <0 50 <0 50 41 79 nm dear 09114100 940 95 58 53 36 3100 <2 0 <2 0 <20 76 450 <20 <2 0 <2 0 4790 nm dear 12112100 <200 <2 0 <2 0 <2 0 <2 0 1900 na no no na no no no rto 4399 nm clear 03119101 <100 <10 <10 <10 <10 470 no no no no na no no no 4196 nm dear 06/19101 <100 12 10 24 60 540 no na no no no no no no 4515 nm clear 09/27101 520 <2 0 24 13 95 2000 na na no no no no na no 4995 nm clear 12113101 <250 <2 5 <2 5 4 5 73 1800 no no no no no no no no 4816 nm clear 03128102 <500 <5 0 <5 0 <50 <5 0 190D na na no na na no no na 4298 1924 2374 dear 6!1912002 630 160 17 52 25 1700 na no no no no no na no 4570 2646 dear 9116/2002 770 82 64 77 15 2100 <5 0 <5 0 <5 0 59 <500 <50 <5 0 <5 0 5072 31 48 cloudy 1212612002 <1000 <10 <10 <10 12 2600 no no no no no no na no 4703 2779 cloudy 3/2612003 520 51 71 71 36 2000 no na no no no no no no 4483 2559 clear 06127/03 1800 550 13 89 13 4200 <10 <10 <10 <100 <1000 <100 <10 no 47 BO 2856 clear 09119/03 510 60 <5 0 92 <5 0 2900 no no no no no no no no 54 16 3492 dear VW 1 03125/99 20000 4000 2000 900 1700 3000 <5 0 <5 0 <50 <5 D <50 640 no na 41 74 nm nm slight odor!no sheen screened 46102/99 23000 5800 2300 1100 1900 8300 <5 0 <5 0 <50 240 <100 <10 <5 0 <50 42 21 am slight odor I no sheen interval 08/31/99 50000 14000 11000 2300 6200 20000 <50 <5 0 7 2 770 <2500 <50 <5 0 <5 0 4731 nm no comment 44 54 12109/99 26000 3300 1900 880 2600 8800 <5 0 <5 0 <5 0 120 <5130 <50 <5 0 <50 4520 nm no comment 03101/00 13600 3500 280 600 330 690D <20 <20 40 <200 <2500 <200 na no 4246 nm no comment 06106/00 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 41 76 nm dear 09114!00 85000 16000 12DOO 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 4790 nm dear 12112/00 21000 4000 2900 690 1800 6300 no no no no no no no no 4423 nm dear 03/19/01 9400 2600 600 430 290 61 DO no no no no no no na no 4172 nm dear 06!19101 67000 13000 8500 1600 6500 17000 no no no no no no no no 4403 nm clear 09/27/01 16000 3300 840 640 1400 5500 no no no no no no no no 5004 nm dear 12/13/01 84000 12000 8600 2100 10000 19000 no no no no na no no no 4655 nm clear 03/28/02 38000 5800 4400 1100 4800 8900 no no no no no no no no 4342 1953 2389 dear 06/19102 37000 6800 2900 1400 3800 13000 no no no no no no no na 4510 2557 clear 09/16/02 56000 7000 2200 1500 5100 14000 <50 <50 <50 <500 <500D <500 <50 <50 5033 3080 dear 12/26102 110000 11000 1ODDO 2400 12000 20000 no no no no no na no no 4785 2832 dear 03126103 33000 3100 1600 1300 4400 7000 no no no no no no no no 4515 2562 clear 06127/03 8400 1300 240 300 550 6100 <10 <10 <10 <100 <1000 <1oo <10 no 4711 2758 Gear 09/19103 ns ns ns ns ns ns ns as ns ns ns ns ns ns nm nm dry 541gmr ds Prated No 164146 Page 5 of 9 HORIZON ENVIRONMWTAL INC