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i TABLE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California i ethyl Depth to TOC Gw Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number pate (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (ugQ (uglL) (uglL) (uglL) (uglL) (uglL) (ug1L) (feet) (feet sea level) (feet sea level) Comments AS 1 02121!(10 80000 7600 16000 1600 9100 34 <2 0 <2 0 <2 0 <20 380 12000 180 250 4589 nm nm slight odorino sheen screened 05118100 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1000 <100 na na 4109 nm no odorino sheen interval 09126100 54000 2600 5300 590 3200 <50 na ria na ria na na na na 49 13 nm slight odor 1 no sheen 64 69 12/21100 52000 5000 10000 1200 6000 <500 na 1121 na na ria na na na 4779 nm adorino sheen 03/27101 140000 16000 34000 3300 18000 <500 na na na na ria na na na 4665 nm odorino sheen 06/26/01 140000 14000 34000 3700 18000 <1 0 <1 0 <1 0 <1 0 <10 <100 <100 83 140 4979 nm odorino sheen 09105101 210000 17000 39000 4600 25000 <500 na na ria na na na na na 5441 nm odorino sheen 11130101 150000 12000 32000 4000 19000 <2000 na na na na na na na na 5470 nm odor/no sheen 02127102 200000 11000 38000 3600 19000 <2000 na na na na na na na na 5096 nm sltghtodorino sheen 05116102 120000 11000 23000 2200 11000 <100 <100 <100 <100 <1000 <10000 <1000 <10D <100 51 11 2242 2869 sltghtodorino sheen AS 2 10120100 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 610 1 1 63 41 52 2076 2076 screened 12121100 18000 120 1200 530 2800 <50 na na na na na na na na 45W 2522 slight odor 1 no sheen interval 03127101 11000 91 820 230 1800 <20 na na na na na na na na 46 51 2575 slight odor 1 no sheen 123 128 06126101 12000 BO 68 220 2000 <2 5 <2 5 <2 5 <2 5 45 <250 <50 <2 5 50 4925 2B 49 slight odor l no sheen 09105101 7400 75 31 140 1100 <20 na na na na na na na na 5329 3253 slight odor l no sheen 11130/01 6600 70 15 110 740 <25 na na na na na na na na 5415 3339 odor/no sheen 02127102 3200 46 98 28 280 <10 na na na na na na na na 5083 3007 odor/no sheen 05/16102 3500 40 10 74 410 <2 0 <2 0 <2 0 <2 0 <20 400 180 <2 0 <2 0 51 10 2232 2878 odor/no sheen AS 3 10120100 <50 <0 50 -050 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 81000 <0 50 <0 50 4607 2060 2547 screened 12121/00 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4805 2745 no odor I no sheen interval 03!27101 <50 23 58 <0 50 -050 <5 0 na na na na na na na na 4682 2622 no odor/no sheen 80 85 06/26/01 <50 <0 50 052 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 690 89 <0 50 4896 2836 no odor I no sheen 09105/01 100 <0 50 <0 50 <0 50 18 <5 0 na na na na na ria na na 5411 3351 odor/no sheen 11130101 74 13 <0 50 <0 50 <0 50 <5 0 na na na na na na ria na 6393 3333 odorino sheen 02127102 73 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5067 3007 no odor I no sheen 05116/02 <50 <0 50 18 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 47 94 <0 50 5097 2214 2883 no odor I no sheen Notes TPI IL,=total petroleum hydrocarbons as basoline TDA—lert butanol GIN—broundwater nm=not measured M 113E=methyl ten butyl ether EDC=ethylene dichloride I OC=top of casmy m=not analyzed DIN =diisopropyl ether EDB—ethylene dlbrotlnde <—less(Iran indicated reporting limit its=not sampled ETBF=ethyl lent butyl ether pb1L= micr%ranis per bier=parts per billion(ppb) TAME=tert amyl methyl ether 419gmr0t ds Page 7 of 7 H03UZOIJ ZNVIItOXJMTAL WC 141945