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TAr GROUNDWATER MOTORING DATA Beacon Station No 12474 3440 East Main Street,Stockton,California ethyl total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDS GW Elevation Elevation Number Date (u 1L) (ug/L) (ug1L) (ug/L) (u IL) (ug/L) (ug/L) (u IL) (u !L) (ug1L) (ug1L) (u IL) (u !L)(uglL) (feet) (feet msl) (feet mal) Comments MW 13 031=04 <200 '20 <20 4 0 <2 0 <2 D <2 0 <2 0 -20 <20 4200 2 900 <2 0 <2 0 nm nc nm no comment screened 06!10104 450 <0 50 0 50 <0 50 <0 50 <0 50 no no no no no 12 0 60 <0 50 61 58 2549 3609 no odor l no sheen Interval 09108/04 450 <0 50 <0 50 <0 50 <0 50 <0 50 no na na no no no <0 50 no 1 6324 3775 no odor!no sheen 145-150 12/09/04 <50 <0 50 1 7 <0 50 <0 50 <5 0 na no no no no na <0 50 no 1 6304 3755 no odorino sheen MW 14 03130/04 77 <0 50 -050 .050 <0 50 <0 50 <0 50 <0 50 <0 50 <50 c50 -50 <0 50 <0 50 nm nc nm no comment na no no na na <5 0 <0 50 <0 50 61 64 2554 3610 no odor 1 no sheen screened 06!10104 58 c0 50 <0 50 <0 50 <0 50 4 50 Interval 09106!04 450 c0 50 <0 50 <0 50 <0 50 <0 50 na no na na na na <0 50 n 63 33 37 79 no odor 1 no sheen o 130.135 12!06104 450 <0 50 35 .050 069 <5 0 na no no na no na <0 50 na 63 36 37 B2 no odorino sheen MW 15 03!30/04 450 <D 50 c0 50 co 50 '050 <0 50 .050 <0 50 <O 50 <50 450 <50 <0 50 40 50 nm nc nm no comment screened 06110104 450 <0 50 <0 50 <05(l <0 50 <0 50 no no na na no no <0 50 <0 50 7263 2490 47 73 no odor 1 no sheen Interval 09/08/04 <50 .050 <0 50 '050 <0 50 1 1 na no no na na na <0 50 na 7239 4749 no odor I no sheen 143 148 12/09104 87 <0 50 16 .050 <0 50 <5 0 no no no no no no <0 50 no 62 7a 3158 no odor/no sheen MW 18 03/30/04 <50 <0 50 <0 50 <0 50 c0 50 <0 50 <4 56 <0 50 <D 5 <5 0 450 <5 0 '050 <0 50 nm nc nm no comment acrwn.d 06110/04 450 -050 <0 50 40 50 <0 50 <0 50 no no no no no no <0 50 <0 SO 61 15 25 07 36 08 no odor!no sheen Inbrval 09/08104 450 e0 50 a0 50 c0 50 <0 50 070 no no na no no no <0 5D na 6289 3702 no odor 1 no sheen 136.141 12109!04 450 <0 50 so <0 50 055 <5 0 no no no no no no <0 50 no 6284 3777 no odorino sheen MW 17 03130104 73 <0 50 1 1 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 15 <0 50 <0 50 nm nc nm no comment screened 06!10!04 62 <0 50 <0 50 <0 50 <0 50 <0 50 na na no no no '50 <0 50 <0 50 6235 2638 3597 no odor 1 no sheen Intarval 09109104 450 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no no no <0 50 na 64 of 37 63 no odor 1 no sheen 135.140 12409/04 <60 <0 50 1 0 <0 50 <0 50 <5 0 no no na no na no <0 50 no 6404 3766 no odorino sheen AS-1 10!26199 1700 100 7 7 26 27 5 0 <0 SO <0 50 <0 50 <5 0 450 200000 5 6 <0 50 60 94 nm nm no odorino sheen no odorino sheen screened 03/03100 4200 so <20 32 <2 0 11 <20 <2 0 <2 0 420 <0 5O 69000 <20 <2 0 5551 nm Interval 06122(00 <20D 03 28 32 42 10 <20 <20 <20 420 4200 55000 .20 <2 0 5404 n- 705-755 m no odorino sheen 70 5.75 5 09f2810O 200 53 1 2 19 21 10 no na no no no no no na 5663 nm no odor/no sheen 12/22/04 96 20 11 4050 062 32 na no na no na no no no 5651 nm no odorino sheen 03/2"1 1200 70 22D 28 120 410 na na no no no na na na 5602 nm no odor/no sheen 06/271111 600 21 A3 3 4 3 9 77 '050 <0 50 <0 50 76 <50 13000 14 <0 50 5680 nm no odorino sheen 09106/01 610 49 35 14 32 68 no no na no no no lla no 5881 nm no odorino sheen 12!04101 4900 540 359 170 BBD <25 no na no no na no no na 5927 nm no odor/no sheen 03101/02 690 55 33 14 77 5 1 no na no na no no no na 5855 nm no odorino sheen 05!20102 2000 140 150 43 170 50 4 50 .050 <0 50 c5 0 x2500 12000 1 3 4 50 5839 2793 3046 no odorino sheen 08/30102 550 21 16 65 19 80 na no no not no na no na 6145 3352 no odor/no sheen 42106102 9800 2000 1300 290 1700 410 no no no no no na no no 61 35 3342 odorino sheen 03107/03 4700 720 430 110 550 <25 no no no no no na na no 6081 3288 odor/no sheen 06103103 2600 460 260 67 350 46 -20 <20 <2 0 <20 4200 4000 420 .20 5973 31 8D odorino sheen 08129103 4250 Be 58 <2 5 37 <25 no no no no no no na no 61 83 33 90 no odor/no sheen 11/25103 no ns no ns ns ns ns ns ns ns no no ns ns 6261 3468 not sampled h 03101/04 1800D 20 18 410 <10 410 <10 <10 410 <100 <1000 1300 410 <10 61 37 2584 3553 no odor/no sheen 06108104 ns no no ns ns ns ns no no ns no ns ns ns 61 77 3593 not sampled IV 09109/04 4309 91 93 1 7 92 <10 no no na na no no no na 6350 3766 no odorino sheen 12/08104 as ns ns ns AS ns ns ns no ns ns ns no ns 6356 3772 not sampled 474gm6o As Page 7 of 11 HORIZON ENVIRONMENTAL INC Rcge No 1474 44