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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 12474 3440 East Main Street,Stockton,California r I ethyl- total Depth to TOC lGW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L (ug/L u L (ug/L (ug/L (ug/L (ug/L u IL) (ug/L (ug/L (ug/L (ug/L1(ugll-) uglL I feet feet msl feet msl Comments WV-1 09108/98 170000 36000 470 0 3300 24000 0 i0 <0 50 <0 50 <0 50 <5 0 61 6 8 na na 58 88 nm b nm strong odor!no sheen I screened 12/30/98 190000 34000 , 490)0 3300 24000 <1000 no no no no na no na no 57 10 nm odor/no sheen interval 03125/99 260000 37000 i 550)0 4800 32000 <50 <50 <50 <50 <50 <500 <50 no no 5505 nm no comment 50-65 06103/99 120000 20000 # 260)0 3500 23000 <50 <50 <50 <50 <50 <500 <50 140 520 5419 II nm no comment 08130199 130000 25000 1 460)0 3900 25000 <50 <50 <50 <50 <500 <5000 <500 160 620 5628 nm no comment 12110/99 200000 22000 ; 350)0 3300 23000 <100 <100 <100 <100 <1000 <10 000 <2000 160 59d 5642 nm no comment 03103!00 180000 23000 { 36001 2500 18000 <100 <100 <1110 -1110 <1010 <20 000 <1000 1500 5800 5113 nm no odor I no sheen 06122100 190000 23000 390100 3200 22000 <100 <100 <100 <100 <1000 <10 000 <1000 130 540 5416 nm no odor lno sheen 09/28/00 nsns n ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 12122!00 190000 29000 420 0 2900 20000 <2000 no no na no na no no no 5582 1 nm odor 1 no sheen 03/28101 180000 36000 40030 4900 20000 <500 no na no na no no no na 5493 II nm odor 1 no sheen 06/27/01 190000 28000 400)0 3900 24000 <200 <200 <200 <200 <2000 <20000 14000 290 730 5643 p nm odor lno sheen 09/06101 230000 36000 430)0 3300 20000 <2000 no na no no no no no no 58 60 nm odor lno sheen 12/04101 200000 32000 410 0 3500 23000 <1000 no no na no na na no na 5891 nm no odor 1 no sheen l 03/01102 230000 29000 370PO 3700 24000 <2000 no no no no no no na no 5774 I, nm slight odor I sheen 05/20/02 220000 32000 410)0 3600 23000 <200 <200 <200 <200 <2000 <20000 <2000 <200 <200 5786 2751 -3035 no odor 1 no sheen 08/30102 200000 31000 310)0 2600 17000 <i000 no no no na na na na no 6090 I-33 39 odorl slight sheen 12106/02 170000 31000 330)0 2800 18000 <25 no no na no na na no no 6123 1-3372 odor lno sheen 03/07103 210000 35000 460)0 3300 21000 <2000 no no na no no na na no 6021 1-3270 odor 1 no sheen ' 06103/03 220000 37000 II 460)0 3500 22000 <100 <100 <100 <100 <1000 <10000 <1000 390 600 5921 1-31 70 odor/no sheen 08129/03 230000 35000 1 330)0 3100 21000 <1000 na na no no na no na na 6130 -3379 no odorino sheen 11125/03 ns ns { n ns ns ns ns ns ns ns ns ns ns ns 4638 1-1887 not sampled 03101/04 210000 37000 ' 37 0)0 2700 19000 <50 <50 <50 <50 <500 <5000 <500 92 <50 6096 2522 135 74 odorino sheen 06/08104 200000 33000 S 45 0)0 2700 18000 <1000 no no no no no na na na 6103 1-3581 odorino sheen 09/09104 170000 30000 i 28 0 2500 15000 <1000 no no na na na no na no 6259 -37 37 odor lno sheen 12/09104 120000 23000 24()0 1500 11000 <500 no na no no no na no no 6282 1-3760 odor 1 no sheen 03/10/05 ns ns I n ns ns ns ns ns ns ns ns ns ns ns nm ;E nm not sampled 05!26105 94000 8000 ' 15 0 1 600 12000 <25 no na na no na no na na 57 90 Y-32 68 odor 1 no sheen i 09/02105 35000 3300 43 10 320 5200 <8 0 no na na no na no 44 43 61 11 l`-35 89 odorino sheen IC VW-2 03/03100 ns ns n ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry screened 06122100 ns ns I n` ns ns ns ns ns ns ns ns ns ns ns nm I nm dry interval 09/28/00 ns ns I n ns ns ns ns ns ns ns ns ns ns ns nm nm dry 37.47' 12/22100 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/28/01 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06127101 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm nm dry D9/061)1 ns ns I n ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12104/01 ns ns n` ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03101/02 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm I nm dry 05120/02 ns ns I n ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03107/03 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm j nm dry 06/03/03 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm nm dry 08/28/03 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm nm dry 11/25/03 ns ns 1 n ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01/04 ns ns ! n ns ns ns ns ns ns ns ns ns ns ns nm 2515 nm not sampled 06108/04 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 09108104 ns ns E n ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 12/08104 ns ns I n ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 03/10105 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm II nm not sampled 05/25105 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 09/01105 ns ns n ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled I i � II 474gmr05 x� HORIZON MRONMENTAL INC r Project No 141448 Pale 1 01.16 E