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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well Tli beruene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u !L !L u !L (ug/L u IL jug/L u !L u 1 jug/L)( u !L (ug/L u !L1(ugll.) (ug/L feet feet ms1 feet msl Comments VW 1 09/08/98 170000 6900 47000 3300 24000 070 <0 50 <0 50 <0 50 <50 61 68 no no 5888 nm nm strong odor f no sheen screened 12/30198 190000 4000 49000 3300 24000 <1000 no no no no no na na no 5110 nm odor lno sheen interval 03/25199 260000 7000 55000 4800 32000 <5 0 <50 <5 0 <5 0 <50 <500 <50 na na 55'05 nm no comment 50.65 06103199 120000 0000 26000 3500 23000 <50 <50 <50 '50 <50 <500 <50 140 520 54'19 nm no comment 08/30/99 130000 5000 46000 3900 25000 <50 <50 <50 <50 <50D <5000 <500 160 620 5B 28 nm no comment 12/10/99 200x00 2000 35000 3300 23000 <100 <100 <100 <100 <1000 <10 000 <2000 160 590 Se 42 nm no comment 03!03100 180000 3000 36000 2500 18000 <100 <100 <100 <100 0000 <2o 000 <1000 1500 5800 55'63 nm no odorino sheen 06/22/00 190000 3000 39000 3200 22000 <100 <100 <100 <1D0 <1000 <10 000 <1000 130 540 54'16 nm no odorino sheen 49!28100 AS ins ns no no ns ns ns ns ns ns ns ns ns nm nm 12/22/00 190000 9000 42000 2900 20000 <2000 no no no no no no no no 55'82 nm odor lno sheen 03/28101 180000 6000 40000 4900 20000 <500 na na na na na na no no 54193 nm odor lnosheen 06/27/01 190000 8000 40000 3900 24000 400 400 <200 400 <2000 <200W 14000 290 730 5643 nm odor f no sheen 09/06101 230000 6000 43000 3300 20000 <2000 no no na no no no no no 5860 nm odor/no sheen 12/04/01 2000DD 000 41000 3500 23000 <1D00 no no no no no no no no 5891 nm no odorino sheen 03/01/02 230000 M 37000 3700 24000 <2000 no no na no no no no no 5774 nm slighlodoO sheen 0520102 220000 20DO 41000 3600 23000 400 400 400 <200 <2000 40000 <2000 400 <200 5786 27 51 3035 no odorino sheen 08/30/02 200000 1000 31000 2600 17000 <1000 no no no no no no no no 6090 3339 adorlslight sheen 12/06/02 170000 1000 33000 2800 18000 <25 no no no no no na na na 61'23 3372 odor lno sheen 03/07/03 210000 5D00 46000 3300 21000 <2000 na na na na na no no no 6021 3270 odor/no sheen 06!03/03 220900 7000 46000 3500 22000 <100 <100 000 <100 <1000 <10000 <1000 390 600 5921 3170 odor/no sheen 0829103 230000 5000 33000 3100 21000 <100D no no no no no no no no 61 30 3379 no odorino sheen 11125103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4638 1687 not sampled 03/01/04 210000 7000 37000 2700 19000 <50 <50 <50 <50 <500 <5000 <500 92 <50 6096 2522 3574 odorl no sheen 06/08104 200000 13000 45000 2700 18000 <1000 no no no na no no no na 6103 3581 odorinosheen 09109104 170000 0000 28040 2500 15000 <1000 no na na no no na na no 6259 3737 odor no sheen 12109104 120000 3004 24000 1500 11000 <500 no no no no no na na na 6282 3760 odor lnosheen D3110105 ns ns ns ns ns ns AS ns ns ns ns ns ns no II nm not sampled VW 2 03193!00 ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry screened 06122100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry Interval 0928100 ns ns ns ns ns ns ns ns ns ns ns AS ns ns rim nm dry 37-4T 1222100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns rim nm dry 03/26101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns rim nm dry 0627101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns rim nm dry 09106/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns rim nm dry 12104/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns rim nm dry 03/01102 ns AS ns ns ns ns ns ns ns ns ns ns ns ns rim nm dry 05120102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/07/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06103/03 ns ns ns ns ns ns ns ns ns ns ns ns AS ns nm nm dry 0828/03 ns ns ns ns ns ns n$ ns ns ns ns ns ns ns rim nm dry 1125103 AS ns ns AS ns ns ns AS no ns ns ns ns ns nm nm dry J 03/01/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns rim 2515 nm notsampled 0610=4 no. ns ns ns no ns` ns no. ns ns ns ns ns ns nm nm not sampled 09/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 12!48104 ns ns ns ns ns ns ns ns ns AS AS ns ns At, rim nm not sampled 03/10/05 ns AS ns ns ns ns ns ns ns ns ns ns ns ns rim nm not sampled II � I rl i r 474gno�5 x� 1 ` Pa Pmi..tNo 14744e ge 1 HOR77AIREMVIROtflflSli7'4t,tNC I