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I TOE I Groundwater Monitoring Data Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene elhylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/1) (ugn) (ug/1) (ug11) (ug") (ug/1) (ugn) (u911) (ugn) (ugn) (ug/1) (ug") (ugn) (ug") (feet) (feet msl) (feet msl) Comments SW 1 10/02/97 ns ns ns ns ns ns ns ns ns ns ns ns no no 5657 nm nm ns screened 03131198 ns ns ns ns ns ns ns ns ns ns ns ns no na 51 23 nm ns interval 06110/98 ns ns ns ns ns ns ns ns ns ns ns ns no no 4584 nm ns 60 65 09108/98 ns ns ns ns ns ns ns ns ns ns ns ns na no 4926 nm ns 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns no no 4399 nm ns 03125/99 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <50 <50 <50 na no 41 95 nm slight odor!no sheen 06/02/99 130 089 <0 50 0050 <0 50 130 <o 50 <0 50 <0 50 <50 <50 <50 <0 50 <0 50 4224 nm slight odor I no sheen 08!31!99 1000 150 53 45 31 1400 <0 50 <0 50 055 54 <100 <50 <0 50 <0 50 4781 nm no comment 12/09/99 53 <0 50 <0 50 <0 50 <0 50 500 <0 50 <0 50 <0 50 54 <50 <5 0 <0 50 <0 50 4460 nm no comment 03/01/00 <200 <2 0 <2 0 <2 0 <2 0 560 <2 0 <2 0 <20 <20 <300 <20 no no 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 4179 nm clear 09/14/00 940 95 58 53 36 3100 <2 0 <2 0 <2 0 76 <250 <20 <2 0 <20 4790 nm clear 12112/00 <200 <2 0 <20 <2 0 <2 0 1900 no no no no no no no no 4399 nm clear 03119/01 <100 <1 0 <1 0 <t 0 <1 0 470 no no no no no no no no 4196 nm clear 06119/01 <100 12 10 24 60 540 no no no no no no no no 4515 nm clear 09/27/01 520 <2 0 24 13 95 2000 no no no no na no no no 4995 nm clear 12113101 <250 <2 5 <2 5 <2 5 73 1800 no no no na na no no na 4616 nm clear VW-1 03/25199 20000 4000 2000 900 1700 3000 <5 0 <50 <50 <50 <50 640 non a] 41 70 nm nm slight odor 1 no sheen screened 06/02199 23000 5800 2300 1100 1900 8300 <5 0 <50 <50 240 <100 <I0 <5 0 <5 0 4221 nm slight odor I no sheen interval 08/31/99 50000 14000 11000 2300 6200 20000 <5 0 <50 72 770 <2500 <50 <50 <5 0 4731 nm no comment 44'54' 12109!99 26000 3300 1900 880 2600 8800 <50 <50 <50 120 <500 <50 <50 <5 0 4520 nm no comment 03/01100 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 na na 4246 nm no comment 06106100 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 4176 nm dear 09/14100 85000 16000 12000 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 clear 03/19/01 9400 2600 600 430 290 6100 no no no no na no no no 4172 nm clear 06/19/01 67000 13000 8500 1600 6500 17000 no no na no no no no no 4403 nm dear 09/27101 16000 3300 840 640 1400 5500 no no no no no no no no 5004 nm clear 12/13/01 84000 12000 8600 2100 10000 19000 no na no no no no na no 4655 nm clear VW-2 03!25199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06102/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 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 ns ns ns ns ns ns ns ns ns nm nm dry 06/06/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/14/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/12/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/19/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/19101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/13/01 ns ns ns n5 ns ns ns ns ns ns ns ns ns ns dry nm dry 641gmr01 As 164144 Page 4 of 6 HORIZON ENVIRONMENTAL INC