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*1 r <br /> GROUNDWATER-MONITORING DATA <br /> Beacon Station No 12474 <br /> 3440 East Main Street,Stockton,California <br /> ethyl- total Depth to TOC GW <br /> Well TPI-Ig benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation <br /> Number Date u 1L u IL Jug/L) (u 1L) ((ug/L u 1L u 1L (u 1L) (u 1L} u 1L (u 1L) Lug/L) u 1L) u 1L feet (feet.MSI) feet MsQ Comments <br /> MW-6 03/31/98 78000 23000 8500 1100 6300 <500 na no no na no no na na 61 43 2544 -3599 reported as MW-2A <br /> screened 06110/98 120000 23000 17000 1600 15000 <500 no no no no no no no no 5869 -3325 reported as MW 2A <br /> interval 09108!98 120000 30000 20000 2300 18000 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no na 5877 -3333 odor!no sheen <br /> 56'-76' 12!30198 71000 20000 6500 1900 11000 <250 no na no na na no no no 5685 -3141 slight odor/nu sheen <br /> 03/25/99 48000 15000 1800 910 5100 <0 50 <0 50 <0 50 <0 50 20 <50 56 no no 5486 2942 no comment <br /> 06103199 33000 9600 2500 1100 5400 <50 <5 0 <5 0 <5 0 <50 <500 <50 <5 0 10 6414 -2870 no comment <br /> 08130/99 51000 7200 5400 2400 11000 42 <20 <20 <20 <200 <2000 <200 32 56 5632 -3088 no comment <br /> 12/10/99 67000 13000 2400 1800 9500 <20 <20 <20 <20 <200 <50 <200 68 46 5629 3085 no comment <br /> 03/03100 28000 6000 280 570 3600 <20 <20 <20 <20 <200 <50 <200 <20 <20 5489 2945 no odor lno sheen <br /> 06/22/00 26000 6500 570 710 2900 <10 <10 <10 <10 <100 <1000 <100 <10 <10 5411 -2867 slight odor lno sheen <br /> 09128/00 30000 920 5300 830 6900 <5 0 no na na no no no no no 5647 3103 slight odor/no sheen <br /> 12122/00 55000 9600 950 1600 8300 <200 no no no no no na no na 5572 -3028 odor/no sheen <br /> 03/28/01 92000 15000 6600 2800 13000 <50 no no no no na no no no 5468 2924 odor 1 no sheen <br /> 06127101 86000 15000 8900 2600 12000 <50 <50 <50 <50 <500 <5000 <1000 94 130 5617 -3073 odor 1 no sheen <br /> 09/06101 95000 17000 11000 2600 12000 <500 na no no na no na no na 5820 -3276 odor lno sheen <br /> 12/04/01 74000 14000 4600 2300 10000 <500 no no no no no no no no 5881 -3337 odor lno sheen <br /> 03/01/02 90000 13000 8300 2700 12000 <500 na na na na no na no no 5761 -3217 odor!no sheen <br /> 05120/02 81000 14000 6200 2100 10000 <100 <100 <100 <100 <1000 <10000 <1000 <100 <100 5785 2739 -3046 odor 1 no sheen <br /> 08130/02 77000 13000 6600 1600 8800 <1000 na no no no no <br /> no no no 6090 -3351 odor lno sheen <br /> 12/06/02 75000 16000 1900 2100 11000 <50 na no no no no no na no 6098 -3359 odor/no sheen <br /> 03/07/03 47000 8500 1400 1900 4800 <500 no no no no no na na na 5999 3260 odor I no sheen <br /> 06/03/03 37000 5300 830 1600 3200 <25 <25 <25 <25 <250 <2500 <250 <25 <25 5784 -3045 odor lno sheen <br /> 08/29/03 86000 15000 2200 2300 11000 <500 no no na na na no no no 6133 -3394 no odor I no sheen <br /> 11125103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6206 -3467 not sampled <br /> 03/01/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 2523 nm not sampled <br /> 06/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 19 -3596 not sampled <br /> 09109104 190000 17000 610 4900 14000 <250 no no no no no na ns ns 6288 -3765 odor lno sheen <br /> 12/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6298 -3775 not sampled <br /> 03/11/05 18000 4100 69 420 630 <10 <10 <10 <10 <100 <1000 <100 <10 <10 6245 -3722 odor lno sheen <br /> 05/25/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6053 -3530 not sampled <br /> 09/02/05 1000 25 36 10 90 <5 0 no no no no no no no no 61 42 -3619 odor 1 no sheen <br /> I <br /> 474gnu0S xis <br /> Project No 1474 48 , Page 6 of 18 HORIZON EHVIROHMRHTAL INC <br />