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0 TABLE I GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC Gw Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u A u A u A u R u A u A u A u A u A) (Lig/1) (u A (ug/1) u A (ug/1) feet feet msl feel msl Comments MW-8 12/16/99 810 63 12 <0 50 1 2 <O 50 <0 50 <0 50 <0 50 97 <100 66 no na 10114 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 clear interval 09114100 170 43 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 <0 50 <0 50 4963 51 51 dear 35 55 12/12100 <50 056 <0 50 <0 50 <0 50 <0 50 no no na na no no no no 4556 5558 dear 03!19101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no na na na no no no no 4301 5813 dear 06/19101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no na na no on na no no 4646 5468 dear 09/27101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no na no no no 51 73 4941 dear 12!13101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no na na na no no no 4799 5315 dear 03/28/02 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no na no no no no no no 4475 2107 2368 dear 06/19102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no na no na na no no na 4711 2604 dear SW 1 10102/97 ns ns ns ns AS ns Its ns ns ns ns AS no no 5657 nm nm ns screened 03131/98 ns ns ns ns ns ns ns ns ns ns ns ns no no 5123 nm ns interval 06/10/98 ns ns ns ns as ns ns ns ns ns ns ns na na 45 B4 nm ns 60-65' 09108198 ns ns ns ns ns ns ns ns ns ns ns ns no na 4926 nm ns 12130/98 ns ns ns ns ns ns ns ns ns ns ns ns no no 4399 nm ns 03/25199 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <50 no no 41 95 nm slight odor!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 12109/99 53 <0 50 <0 50 <0 50 <0 50 5D0 <0 50 <O 50 <0 50 54 <50 <5 0 <0 50 <0 50 4460 nm no comment 03101!00 <200 <2 0 <2 0 <2 0 <2 0 560 <2 0 <2 0 <2 0 <20 <300 <20 no na 4238 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 09/14100 940 95 58 53 36 3100 <2 0 <2 0 <2 0 76 <250 <20 <2 0 <2 0 4790 nm dear 1212100 <200 <2 0 <2 0 <2 0 <2 0 1900 no no no no na no no no 4399 nm dear 0319101 <100 <10 <10 <10 <10 470 no ria na no no no no no 4196 nm clear 06/19101 <100 12 10 24 60 540 na no no no no no no na 4515 nm dear 09/27101 520 <2 0 24 13 95 2000 no no na no no na no no 4995 nm dear 12/13101 <250 <2 5 <2 5 <2 5 73 1800 na no na na no no no na 4616 nm dear 03/28/02 <500 <5 0 <5 0 <5 0 <50 1900 na no no no no na na no 4298 1924 2374 dear 6119/2002 630 160 17 52 25 1700 no no na na na no no na 4570 2646 dear I VW-1 03125/99 20000 4000 2000 900 1700 3000 <5 0 <5 0 <50 <5 0 <50 640 no no 4170 nm nm slight odor!no sheen screened 06102/99 230M 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 08/31199 50000 14000 11000 2300 6200 20000 <5 0 <5 0 72 770 <2500 <50 <5 0 <5 0 4731 nm no comment 44'-54 12109/99 26000 3300 19DO 880 2600 8800 <5 0 <5 0 <5 0 120 <500 <50 <5 0 <5 0 4520 nm no comment 03/01/00 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 na no 4246 nm no comment 061061DO 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 41 76 nm dear 09114/00 85000 16000 120DO 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 4790 nm dear 12112/00 21000 4000 2900 690 1800 6300 no na no no no no no no 4423 nm dear 03119/01 9400 2600 600 430 290 6100 no no no no no no no na 4172 nm dear 06119/01 67000 13000 8500 1600 6500 17000 no na no no no no no no 4403 nm dear 09/27101 16000 3300 840 640 1400 5500 na na no no no no no no 5004 nm dear 1213101 84000 120DO 8600 2100 10000 19000 no no no no no no no no 4655 nm clear 03/28102 38000 5800 4400 1100 4800 8900 na no na no no no no na 4342 1953 2389 dear 06/19102 37000 6800 2900 1400 3800 13000 no no no no no no no no 4510 2557 dear 641gmt01 As 1641 22 Page 4 of 7 HORIZON BNVIR01111M8NTAL INC.