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TA*1 �' n GROUNDWATER MONITORING DATA Beacon Station No. 12474 j 3440 East Main Street,Stockton,California �i ethyl- total Depth to TOC GW f Well TPI-Ig benzene toluene benzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Datea 1L a 'IL u 1L (u/L (ug/L u IL1(ug/L) u1L a 1L (ug/L (ug/L (ug/L (ug/L (ug/L feet feet msl feet Tj1L Comments VW-3 03/03/00 ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry screened 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry Interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 23-33' 12/22/00 i ns. ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/28/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/06/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/04/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03101!02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05/20/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/07/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/03/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/28/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 11!25103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 25.22 nm dry 06108104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 09/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 12/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 03/10/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 05/25/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 09/01105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 12/14/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled VW-4 09108198 86000 19000 6900 3100 20000 1.4 <0.50 <0.50 <0.50 <5.0 74.0 <5.0 na no 59.10 nm nm strong odorino sheen screened 12!30198 79000 29000 1600 3700 16000 000 no no na na na no no na 57.28 nm petrol.odor/ no sheen Interval 03125!99 89000 14000 2700 3200 13000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 na na 55.23 nm no comment 50'-65' 06/03/99 39000 10000 1600 2900 11000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 54.44 nm no comment 08/30/99 50000 9200 1500 3500 12000 86 <20 <20 <20 <200 <2000 <200 850 64 56.53 nm no comment 12/10199 64000 930D 2200 2800 9700 <20 <20 <20 <20 <200 <10000 <200 710 42 56.61 nm no Comment 03103/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12122/00 55000 6400 1600 3200 5400 <200 no no no na no na no no 56.01 nm odor!no sheen 03/28101 41000 5200 2000 2700 4600 <200 no no na na na na no no 55.00 nm odor l no sheen 06/27/01 28000 5000 580 3000 1900 <20 <20 <20 <20 <200 <2000 <200 370 <20 56.42 nm odor/no sheen 09/06/01 26000 2900 410 2800 840 <100 no na na no na no na na 58.45 nm odor 1 no sheen 12104/01 22000 2000 550 2400 1200 <100 no na na no na no na no 59.10 nm odor 1 no sheen 03MI102 20000 1900 110 2600 1400 <100 no no no na no no no no 57.95 nm odorno sheen 05/20/02 18000 1300 430 2000 1600 <10 <10 <10 <10 <100 <1000 <100 130 <10 58.09 27.74 -30.35 no odor 1 no sheen 08130/02 20000 1500 460 2300 1300 <100 na no no no na na na no 61.04 -33.30 odor 1 no sheen 12106102 36000 3600 1000 3000 4300 <20 no no no no no no no no 61.44 -33.70 odor 1 no sheen 03/07/03 45000 4600 2400 3100 6700 <200 no no no no no no no no 60.37 -32.63 odor 1 no sheen 08103/03 38000 5300 710 3100 4800 <20 <20 <20 <20 <200 <2000 <200 <20 <20 59.77 -32.03 odor l no sheen 08/29/03 40000 5000 1200 2500 4000 <200 no na no no no na no no 61.51 -33.77 no odor 1 no sheen 11/25/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61.99 -34.25 not sampled 03/01/04 33000 4600 1300 2400 3300 <10 <10 <10 <10 <100 <1000 <100 38 <10 60.70 25.22 -35.48 odor 1 no sheen 06108/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns61.04 -35.82 not sampled 09/09/04 20000 3800 450 1400 980 <100 no na no no no no no no 62.75 -37.53 odor/no sheen 12108/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62"88 -37.66 not sampled 03/10/05 ns ni ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 05125(05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 57.94 -32.72 not sampled 09/02105 2300 130 93 100 230 <5.0 no no no no na no no no 61.05 -35.83 odor/no sheen 12/14/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61.40 -36.18 not sampled tojw o.14 HORIZON ENMON30NTAL INC. Project No.1474.48 �� Page 16 of 18 I I'