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i i i TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane, Stockton,California Depth to TOC GW Well TPHg benzene toluene etbylbenxene xylenes MTBE DIPE ETBE TAME TBA mcd enol ethanol EDC EDB GW Elevation Elevation Number Date (ug/1) (LLS/1) (ug/1) (aglq (ug10 (ugll) (ug/1) (u 11) *11) (ugll) (u!p 4/1) (ug11) (ugll) (feet) (fen msl) (tett msq Comments MW4 12116199 810 63 I2 <050 12 <050 <050 <050 <050 97 <100 66 na na IOL 14 screened 061(16700 330 3 1 <0 50 <0 50 058 <0 50 <0 50 <0 50 <050 78 <50 <50 <0 50 <0 50 4342 57 72 clear interval 09114/00 170 4 3 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 <0 50 <0 50 4963 5151 clear 35 55 12112/00 <50 056 <0 50 <0 50 <0 50 <0 50 na 1121 na na na na ea na 4556 55 58 clear 03/19101 <50 <0 50 <0 50 <0 50 <0 50 <050 na na na na 112 na na na 4301 58 13 clear 06/19101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 1121 1121 na na na na na na 4646 5468 clear 09/27/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na Fill na 1121 na 51 73 4941 clear 12113101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 1121 na na na na na 1121 na 4799 53 15 clear 03/28/02 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 4475 21 07 23 68 clear SW l 1010207 us its os ns ns ns ns ns ns ns ns 115 na na 5657 nm nm ns screened 03131/98 ns ns ns ns ns ns ns us ns ns ns ns na na 51 23 Fim ns interval 06110/98 ns ns ns as as ns ns ns ns ns In. ns na na 45 84 nm ns 60 65 09108799 its m ns as ns ns ns ns ns as ns ns na na 4926 nm ns 12/30/98 ns Its ns ns ns ns m Its ns as ns us na na 4399 nm ns 03/25199 90 <050 071 <0 50 053 71 <0 50 <0 50 055 <50 <50 <50 na na 41 95 nm slight odor I no sheen 06102!99 130 089 <0 50 <0 50 <0 50 130 <050 <0 50 <0 50 <50 <50 <50 <050 <050 42 24 nm slight odor I no sheen 08131!99 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <50 <050 <050 47 81 nm no comment 12109199 53 <0 50 <0 50 <0 50 <0 50 500 <0 50 <0 50 <0 50 5 4 <50 <50 <050 <050 4460 nm no comment 03101100 <200 <20 <2 0 <20 <20 560 <20 <20 <20 <20 <300 <20 na na 42 38 nm no comment 06!06100 60 22 <0 50 <0 50 <0 50 510 <0 50 <0 50 <0 50 28 <200 <50 <050 <050 41 79 nm clear 09114/00 940 95 58 53 36 3100 <20 <20 <20 76 <250 <20 <20 <2 0 47 90 nm clear 12112/00 <200 <20 <20 <20 <20 1900 na na na na na na "a na 43 99 om clear 03119/01 <100 <1 0 <1 0 <10 <l 0 470 na na 1121 na na na na na 41 96 nm clear 06119/01 <100 12 10 24 60 540 na na na na na na na na 45 15 nm clear 09/27/01 520 <20 2 4 13 9 5 2000 na na na na na na na na 4995 nm clear 12113101 <250 <25 <25 <25 7 3 1800 na na 11a na na. na na na 46 16 nm clear 03/28/02 <500 <50 <50 <5 0 <50 1900 na na na na na na na na 4298 19 24 23 74 clear V W 1 03125/99 20000 4000 2000 900 1700 3000 <50 <5 0 <50 <50 <50 610 na na 41 70 nm om shght odor 1 no sheen screened 06!02199 230W 5800 2300 1100 1900 8300 <50 <50 <50 240 <100 <10 <50 <5 0 4221 am slight odor 1 no sheen interval 08131/99 50000 14000 11000 2300 6200 20000 <50 <50 72 770 <2500 <50 <5 0 <5 0 4731 nm no comment 44 54 12109/99 26000 3300 1900 880 2600 8800 <5 0 <50 <50 120 <500 <50 <5 0 <5 0 4520 nm no comment 03101/00 13000 3500 290 600 330 6900 <20 <20 <20 <200 <2500 <200 na na 4246 nm no comment 06106/00 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 4176 tun clear 09!14!00 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 4790 n1n clear 12/12/00 21000 4000 29W 690 1800 6300 na na na na ea na Jul 1121 4423 tum clear 03119/01 9400 2600 600 430 290 6100 na na na na na na na na 41 72 nm clear 06119/01 67000 13000 8500 1600 6500 17000 na na na na na na na na 4403 nm clear 0912710: 16000 3300 840 640 1400 5500 na na na na na 1121 na na 50 04 tum clear 12/13101 840(10 12000 8600 2100 10000 19000 na na na na na na na 1121 4655 nm clear 03128!02 38000 5800 4400 1100 4800 8900 1121 na na na 1121 na Fill na 4342 1953 2389 clear 641 gmto I xis 1641 22 Page 4 of 7 HORIZON ENVIRONMCNTAI INC