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i i li I TABLE 1 I! n GROUNDWATER MONITORING DATA t Beacon Station No 12474 3440 East Main Street,Stockton,California 6 z 1 ethyl- total Depth to TOC " GW Well TPI-Ig benzene tol ene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u !L u !L (u 11L u IL u 1L u 1L u 1L u 1L u 1L u IL u 1L a 1L (u 1L u 1L feet (feet msl) (feet msl Comments VW-1 09/08/98 170000 36000 47 0 3300 24000 070 <0 50 <0 50 <0 50 <5 0 61 68 na na 5888 nm i nm strong odor I no sheen screened 12/30/98 190000 34000 49 00 3300 24000 <1000 no na no no na na na na 5710 nm odor lno sheen interval 03125/99 260000 t37000 55 00 4800 32000 <50 <50 <50 <5 0 <50 <500 <50 no na 5505 IE nm no comment 50'-65' 06/03199 120000 20000 26 00 3500 23000 <5 0 <50 <50 <5 0 <50 <500 <50 140 520 5419 am no comment 08/30/99 130000 25000 46 00 3900 25000 <50 <50 <50 <50 <500 <5000 <500 160 620 5628 am no comment 12110199 200000 22000 35000 3300 23000 <100 <100 <100 <100 <1000 <10 000 <2000 160 590 5642 nm no comment 03/03100 180000 23000 36Q00 2500 18000 <100 <100 <100 <100 <1000 <20 000 <1000 1500 5800 5563 1 nm no odor l no sheen 06/22100 190000 23000 39400 3200 22000 <100 <100 <100 <100 <1000 <10 000 <1000 130 540 5416 nm no odor lno sheen ' 09/28100 as ns s ns ns ns as as ns ns as ns ns ns nm nm not sampled 12/22/00 190000 129000 400 2900 20000 <2000 no na na na no no na no 5582 4 nm odor!no sheen 03/28/01 180000 136000 40 00 4900 20000 <500 no no na no no no no .no 5493 it nm odor lno sheen 06127/01 190000 28000 40 00 3900 24000 <200 <200 <200 <200 <2000 <20000 14000 290 730 5643 am odor 1 no sheen 09/06101 230000 36000 43 00 3300 20000 <2000 no na na no no no na - no 5860 nm odor lno sheen 12/04/01 200000 32000 41 00 3500 23000 <1000 na na no no no na na no 5891 1� am no odor I no sheen 03/01/02 230000 29000 37 00 3700 24000 <2000 no no na no no na no na 5774 , nm slight odor I sheen 05/20/02 220000 32000 41 00 3600 23000 <200 <200 <200 <200 <2000 <20000 <2000 <200 <200 5786 27 51 !-30 35 no odor Ino sheen 08130/02 200000 31000 31100 2600 17000 <1000 no na no no no no no no 6090 33 39 odor/slight sheen 12/06/02 170000 31000 33100 2800 18000 <25 na na no no no na na no 6123 "-33 72 odor Ino sheen 03/07/03 210000 35000 46100 3300 21000 <2000 no no no no na na na no 6021 11 32 70 odor I no sheen 06/03103 220000 37000 46)00 3500 22000 <100 <100 <100 <100 <1000 <10000 <1000 390 600 5921 -3170 odor/no sheen 08!29103 230000 35000 33 00 3100 21000 <1000 na na no no na no no no 6130 ` 33 79 no odor/na sheen 11125/03 as nss ns ns ns as ns ns ns as as ns as 4638 -1887 not sampled 03/01/04 210000 37000 3700 2700 19000 <50 <50 <50 <50 <500 <5000 <500 92 <50 6096 2522 -3574 odort no sheen 06108/04 200000 33000 45 00 2700 18000 <1000 na na no no na na no no 6103 II-35 81 odor/no sheen 09109/04 170000 30000 28 00 2500 15000 <1000 na no no no no na no no 6259 i-37 37 odor lno sheen 12109/04 120000 23000 2 00 1500 11000 <500 no no na no na no no no 6282 4 3760 odor/no sheen 03/10/05 ns ns As ns ns ns ns ns ns ns ns ns ns ns nm U nm not sampled 05126/05 94000 8000 15100 1 600 12000 125 na no no no no na na na 5790 I -3268 odor 1 no sheen r p VW-2 03/03100 ns ns Is ns ns ns ns ns as ns nm ns ns ns nm nm ! nm dry screened 06/22100 ns ns i s as as ns ns ns ns ns ns ns ns ns 1 nm nm dry interval 09728/00 as as is ns ns ns ns ns as ns ns ns ns as nm nm dry 37-47' 12122!00 ns nss as ns ns ns ns as ns ns ns ns ns nm nm dry 03128101 ns as s as �ns ns as ns ns ns ns ns ns ns I nm nm dry 06/27/01 as as r rs ns as ns ns ns as ns ns ns ns as nm nm dry 09106/01 ns ns lis as ns ns ns ns ns ns ns ns ns ns nm nm dry 12/04101 ns nss as ns ns ns ns as ns as ns ns as nm nm dry 03101102 as ns `s ns ns ns ns ns ns ns ns as ns as nm nm dry 05120/02 ns as ! ns as ns ns ns ns ns ns ns as ns as nm nm dry 03/07/03 ns ns s ns as ns ns ns ns ns as as ns as nm nm dry 06/03/03 ns ns s ns ns ns ns ns ns as as ns as ns nm nm dry 08/28103 as as re`s ns ns ns as as ns as ns as as ns nm nm dry 11/25103 ns i as SS`s ns ns ns as as ns as as ns as ns nm nm dry 03/01104 as ns qhs ns ns ns ns ns as as ns ns ns ns nm 2515 nm not sampled 06/08/04 ns as his ns ns ns ns ns ns as ns ns ns ns nm nm not sampled 09/08/04 ns fis A'S ns ns ns ns ns ns as ns ns ns ns nm nm not sampled 12/08104 ns ns res ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 03/10/05 ns as ns ns as ns ns ns ns ns ns ns ns ns nm nm not sampled 05125/05 ns ns `Is ns ns as ns ns as ns ns ns ns ns nm nm not sampled 474gmr05 x I Prgeet No 147 46 r Pageit,8 HORIZON]3NVIRONDSE INCS