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i • • TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 East Hammer Lane, Stockton, California Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDS GW Elevation Elevation Number Date NO) u " u A jug/I) ((ug/l (ug/1) u A u 11 u A u 11u Il u n u n u ll feet feet msl feet msl Comments MW-8 12116!99 610 63 1 2 <0 50 12 <0 50 -050 <0 50 <0 50 97 <100 66 no no 10114 screened 06/06100 330 31 <0 50 <0 50 058 <0 50 <0 50 <0 50 <0 50 78 <50 <50 <0 50 <0 50 4342 5772 clear interval 09/14/00 170 43 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 11 <50 <50 <0 50 <0 50 4963 5151 clear 35-55 12112100 <50 056 <0 50 <0 50 <0 50 4050 no na na no no na no na 4556 5558 clear 03119/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no na no no na no no no 4301 5813 clear 06/19101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no no no no no 4646 5468 clear 09/27101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na no no na no no na no 5173 4941 clear 12113/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no na na no no no no na 4799 5315 clear 03128102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no no na no no 4475 2107 2368 clear 06/19/02 150 <0 50 <0 50 <0 50 <0 50 <0 50 no no no na no no no no 4711 -26 04 Gear 09/16102 <50 <0 50 <0 54 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 5200 3093 cloudy 12/26/02 <50 <0 50 <0 50 <0 50 <0 50 -050 no na no no no na no na 4891 2784 cloudy 03126/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no na na no no no na 4669 -2562 dear SW I 10102197 ns ns ns ns ns ns ns ns ns AS ns ns no no 5657 nm nm ns screened 03131M ns ns ns ns ns ns ns ns ns ns ns ns na no 51 23 nm ns interval 06/10198 ns ns ns ns ns ns ns ns ns ns ns ns no no 4584 nm ns 60-66 09108M ns ns ns ns ns ns ns ns ns ns ns ns na na 4926 nm ns 12130t98 ns ns ns ns ns ns ns ns ns ns ns ns na no 4399 nm ns 03125/99 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <5 0 na no 4195 nm slight odor 1 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 08/31/99 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <50 <0 50 <0 50 47 61 nm no comment 12!09199 53 <0 50 <0 50 <0 50 <0 50 500 <0 50 <0 50 <0 50 54 <50 <50 <0 50 <0 50 4460 nm no comment 03101/00 <200 <2 0 -20 <2 0 <2 0 560 <2 0 <2 0 420 <20 <300 <20 no no 4238 nm no comment 06106!00 60 22 <0 50 <0 50 <0 50 510 <0 50 <0 50 111111 28 <200 <5 0 <0 50 <0 50 41 79 nm clear 09114/00 940 95 58 53 36 3100 <2 0 <2 0 <2 0 76 <250 <20 -20 <2 0 4790 nm clear 12112100 <200 <2 0 <2 0 <2 0 <2 0 1900 na no no no na no no no 4399 nm clear 03/19101 <100 <10 <10 <10 <10 470 no no no no no no no no 4196 nm clear 06119101 <100 12 10 24 60 540 no no na na no no no no 4515 nm dear 09127101 520 <2 0 24 13 95 2000 no no na no na no na no 4995 nm clear 12/13/01 <250 <25 <2 5 <2 5 73 1800 no no na no no no no no 4616 nm clear 03128102 <500 <50 <5 0 <50 <5 0 1900 no na na no no na no na 4298 1924 -2374 Gear 611912002 630 160 17 52 25 1700 no no no no no na na no- 4570 -2646 clear 9/1612002 770 82 64 77 15 2100 <50 -50 <50 59 <500 <50 <5 0 <5 0 5072 -3148 cloudy 12126/2002 <1000 <10 <10 <10 12 2600 na no na no na no no no 4703 -2779 cloudy 3/2612003 520 51 71 71 36 2000 no no no na na no na no "83 2559 clear 641gmr Page 4 of 7 HORIZON ENVIRONMENTAL Project No 164145