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s 0 TABLE 1 Groundwater Monitoring Data Beacon Station No 641 1210 E Hammer Lane,Stockton,California Well TPHg benzene toluene ethylbenzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (u A) (u A) (u9A) Sam) (ug4) (ugA) (u9A) (ug/1) (ugA) (ug4) (ug/1) (ugA) (ugA) (ugly (feet) (feet msl) (feet mst) Comments MW 6 10/02/97 87000 21000 10000 2000 10000 3800 <5 0 <5 0 <5 0 <500 <50000 <10000 na na 5733 9958 4225 no sheen no odor screened 03131/98 10000 2100 1500 270 710 530 na na na na na na na na 4919 6039 no sheen odor interval 06110198 3100 510 470 45 310 180 na na na na nana na na 4622 5336 no sheen odor 50 75 09/08/98 24000 6500 1000 920 1400 4500 <2 5 <2 5 3 4 48 3600 <25 na na 49 55 5003 no sheen odor 12/30198 340 32 <2 5 29 <2 5 980 na na na na na na as na 44 1 5548 no sheen odor 03/25/99 540 100 1 8 12 36 280 <10 <10 <10 <100 <50 <50 na na 4147 58 11 odor/no sheen 06/02199 2700 1200 83 230 120 1200 <0 50 <0 50 <0 50 51 <50 <5 0 <0 50 <0 50 4251 5707 odor/no sheen 08/31/99 30000 4700 3700 1700 2600 9100 <0 50 051 4 1 310 <500 <5 0 <0 50 <0 50 481 51 4B no comment 12!09199 3100 32 62 40 87 6200 <5 0 <5 0 <50 85 <500 <50 <5 0 <5 0 4496 5462 no comment 03/01/00 <500 21 <5 0 <50 <5 0 4500 <5 0 <5 0 <5 0 72 <500 <50 na na 4251 5707 no comment 06/06/00 3400 800 74 240 120 3900 <5 0 <5 0 <5 0 180 <500 <50 <5 0 <5 0 42 15 5743 dear MW-6 12/16/99 890 <0 50 <0 50 29 <0 50 1 560 <0 50 <0 50 <0 50 54 <100 — screened 06/00100 220 <0 50 <0 50 <0 50 <0 50 84 <0 50 <0 50 <0 50 48 <50 <5 0 <0 50 <0 50 4037 5783 dear mterva! 35 55 MW 7 12/16/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 23 <100 <5 0 na na 100 02 screened 06/06/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 79 <50 <5 0 <0 50 <0 50 4204 5798 clear interval 35 55 MW-8 12/16/99 810 63 1 2 <0 50 1 2 <0 50 <0 50 <0 50 <0 50 97 <100 66 —Ta—na 101 14 screened 06/06/00 330 31 <0 50 <0 50 058 <0 50 <0 50 <0 50 <0 50 78 <50 <5 0 <0 50 <0 50 4342 5772 dear interval 35-55 SW-1 10/02/97 as ns as ns as as ns ns ns ns as ns na na 56 57 nm nm as screened 03/31/98 ns ns as AS ns ns ns ns ns ns ns ns na na 5123 nm ns interval 06/10/98 ns as ns ns ns as ns ns as ns ns ns na na 4584 nm ns 60-65' 09/08/98 ns ns ns ns ns ns ns as ns ns ns ns na na 4926 nm ns 12130/98 ns ns ns as ns ns as ns as ns ns as na na 4399 nm ns 03/25/99 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <5 0 na na 41 95 nm slight odor/no sheen 06/02/99 130 089 <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 1 no sheen 08/31199 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <5 0 <0 50 <0 So 4781 nm no comment 12/09/99 53 <0 50 <0 50 <0 50 <0 50 Soo <0 50 <0 50 <0 50 54 <50 <5 0 <0 50 <0 50 446 nm no comment 03/01/00 <200 <20 <2 0 <20 <2 0 560 <2 0 <2 0 <2 0 <20 <300 <20 na na 42 38 nm no comment 06/06/00 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 VW 1 03/25/99 20000 4000 2000 900 1700 3000 <5 0 <5 0 <5 0 <5 0 <50 640 na na 41 7 nm nm slight odor/no sheen screened 06/02/99 23000 5800 2300 1100 1900 8300 <5 0 <5 0 <5 0 240 <100 <10 <5 0 <5 0 4221 nm slight odor I no sheen interval 08/31/99 50000 14000 11000 2300 6200 20000 <5 0 <5 0 72 770 <2500 <50 <5 0 <5 0 4731 nm no comment 44 54 12/09/99 26000 3300 1900 880 2600 8800 <5 0 <5 0 <5 0 120 <500 <50 <5 0 <5 0 452 nm no comment 03/01100 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 na na 4246 nm no comment 06/06/00 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 41 76 nm dear VW 2 03!25199 as ns as ns ns ns ns ns ns ns ns ns 1 ns as nm nm nm r dry screened 06102199 as ns ns ns as ns ns ns ns ns ns as ns ns nm nm dry rnlerval 08/31/99 ns ns ns ns ns as ns ns as ns ns as as as nm nm dry 21-36 12/09/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01/00 ns ns ns ns ns as ns ns ns ns ns ns ns ns am nm dry 06f06100 ns ns as ns ns ns ns ns ns ns ns ns ns ns nm nm dry 641gmr00 As 164143 Page 2 of 3 HORIZON ENVIRONMENTAL INC