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TA01 0 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOC GW rNumber TPHg benzene toluene benzene xylenes MTBE DIPE ME TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Date (ug/L) (ugIL) u !L) (ug/L) (ug/L) (ug/L) (ug/L) (u L (ug1L) (ug/L) (ug/L) (ug/L) (uglL) u !L) (feet) (feet sea level) (feet sea level) Comments 10120100 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <50 <50 610 1 1 63 4152 2076 2076 12121100 18000 120 1200 530 2800 <50 no no no na no no na na 4598 2522 slight odor Ino sheen 03/27/01 11000 91 820 230 1800 <20 na na no no no no na no 4651 2575 slight odor 1 no sheen 06126101 12000 80 68 220 2000 <25 <2 5 <2 5 <2 5 <25 <250 <5D <2 5 50 4925 2849 slight odor 1 no sheen 09105/01 7400 75 31 140 1100 <20 no no no na na na no na 5329 3253 slight odor Ino sheen 11130/01 6600 70 15 110 740 <25 no na na na no no na no 5415 3339 odorino sheen 02127/02 3200 46 99 28 280 <10 na no no no na no na no 5083 3007 ododno sheen 05/16/02 3500 40 10 74 410 <2 0 <2 0 <2 0 <2 0 <20 <20p 180 <20 <2 0 51 10 2232 2878 ododno sheen D9113102 3400 120 110 89 480 <10 na na na na no na no no 5937 3705 odor Ino sheen 12/04/02 1400 40 12 11 110 <5 0 no no no no na na no no 5839 3607 no odor Ino sheen 02/17103 420 16 49 28 43 <0 50 no na no no no no na na .5408 3176 no odor I no sheen 06103103 450 27 12 32 90 <0 50 <0 50 <0 50 <0 50 <5 0 <50 58 <0 50 <0 50 5396 3164 no odor 1 no sheen 09/18103 3800 16 094 12 66 450 no no na no no no na no 60 31 3799 no odor 1 no sheen 11124103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5880 3648 not sampled 02123104 2200 76 17 72 74 <0 50 <0 50 <0 50 <0 50 <5G <50 77 <0 50 <0 50 5523 3291 odor 1 no sheen 06/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5578 3346 not sampled 09107)04 1200 <0 50 <0 50 <0 50 <0 5D <0 50 na no no no no na no no 6238 -4004 no odor 1 no sheen 12/10/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5978 -3746 not sampled 03109105 55 088 60 096 27 <0 50 <0 50 <0 50 <0 50 <5 0 <50 15 <0 50 <0 50 5605 3373 odor I no sheen AS-3 10/20/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 81000 <0 50 <0 50 4607 2060 2547 screened 12121/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na no no no no 4805 -2745 no odor!no sheen interval 03/27/01 <50 23 58 <0 50 <0 50 <50 na na na no no no na no 4682 -2622 no odor!no sheen 80-85 06126101 <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 1 no sheen 09105/01 100 <0 50 <0 50 <0 50 18 <50 na no no no no no na no 5411 3351 odorino sheen 11!30101 74 1 3 <0 50 <0 50 <0 50 <50 no na na no no na na na 5393 -3333 odor/no sheen 02/27/02 73 <0 50 <0 50 <0 50 <0 50 <50 no no no na na no no no 5067 3007 no odor 1 no sheen 05/16/02 <50 <0 50 18 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 47 94 <0 50 5097 22 14 2983 no odor 1 no sheen 09/13102 75 <0 50 1 1 <0 50 <0 50 <5 0 no no na na no no no na 5886 3672 odor 1 no sheen 12104102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na no no no no no na 5234 3020 no odor I no sheen 02117/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 50 71 2857 no access 06102/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 84 13 <D 50 5422 -3208 no odor 1 no sheen 09/18/03 45000 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no na na no 6000 3786 no odor 1 no sheen 11124/03 ns ns ns ns ns ns AS ns ns ns ns ns ns ns 5864 3650 not sampled 02/23/04 860 <0 50 094 <0 50 059 072 <0 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 5504 3290 odor 1 no sheen 06/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5554 3340 not sampled 09!07104 52DO 69 36 66 370 <0 50 no na no no no na na no 62 08 -3994 no odor lno sheen 12/10104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5958 37 44 not sampled 03109105 690 41 15 <0 50 067 <0 50 <0 50 <0 50 <0 50 <5 0 <50 67 99 <0 50 5554 3340 odor 1 no sheen Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tort-butanol GW=groundwater nm=not measured MTBE=methyl tart butyl ether DCA=Dichloruethane TOC=top of casing na=not analyzed RIPE=dusopropyl ether EDB=dibromoetheno <=less than indicated reporting limit ns=not sampled ETBE=ethyl-tart butyl ether pg1L= micrograms per liter=parts per billion(ppb) TAME=tart amyl-methyl ether rotmi Na 141848 Pxis Page 13 o1 13 HORIZON ENVIRONMENTAL INC �gacl N