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Table 4 Summary of ITB Geoeberoical Indication Dd Monte Dison Site Stockton,California Well No. MW-DIS-2 in the BTEXplume) MW-DIS-3(plume MEW MW-DISC Q2aRLunQ Sampling Date 10/18/95 4118/96 8115196 Average 1(!18/95 4118196 8115196 Av a 10118195 4118196 8115/96 Average Parameter Units Dissolved Oxygen mg/L <0.5 <0.5 <0.5 <0S <0.5 <0.5 <0.5 <0S ?1.8? 4.5 4.6 4.6 ittate-N mg/L <0.02 <0.02 <0.01 <0.02 <0.02 <0.02 <0.01 <0.02 6.8 5.06 5.24 5.7 errous Iron(Fe2+) MIX 1.28 0.529 0.863 0.9 0.0509 <0.025 <0.1 0.06 79.54? <0.025 <0.1 0.1 sulfate mg1L 7.9 1.98 5.84 5.2 8 8.53 7.92 8.2 10.3 10.4 11.1 11 Dissolved Methane m91L 0.002 0.0042 0.0034 0.003 0.002 0.00096 0.001 0.001 0.001 0.0069 <0.0013 0.003 Alkalinity(as CaCO3) mg/L 468 395 489 451 451 418 398 422 463 420 435 439 Total Organic Carbon mg/L 9.2 11.7 8.4 10 5.1 4.8 6.1 5 5.4 4.8 8.1 6 Redox Potential mV -140 -172 -173 -162 .250 -82 3 -110 ?-100? 207 134 171 Total BTEX mWL 1.008 5.76 0.314 2A 4.0003 <0.00M 4.0403 <0.0003 NA NA NA NA Well No. MW-DIS-8S(plume Mug:) MW-DIS-BD lume frim MW-DIS-9(plume frim e/back and MW-DIS-10(plume frim e 5 nlin Date 10/18/95 4/18/96 8115196 Averne 10/16/95 4118/96 8/1516 Avenge 10/18/95 4118196 8/15/96 Avera 1011895 4118196 8115/96 Average Paramaer Units Dissolved Oxygen mg/L <0.5 <0.5 <0.5 <OS <0.5 1.8 1.3 1.2 0.8 <03 4 1.8 NA NA 0.3 urate-N mg/L 4.4 0.04 3.47 3 3.1 2.52 3.17 3 8.2 8-54 7.41 8.1 NA NA NA Ferrous Iron(Fe2+) mg/L 1.04 <0.025 <0.1 OA <0.025 <0.025 <0.1 <0.05 <0.025 <0.025 <0.1 <0.05 NA NA NA Sulfate mg/L 24.9 20.3 22.7 23 10.6 9.54 10.6 10 29.9 33.5 47 37 NA NA NA Dissolved Methane m91L 0.0012 0.0068 0.0024 0.003 0.001 0.0019 <0.002 <0.002 0.0007 0.0011 <0.0012 <0.0012 NA NA NA Alkalinity(as CaCO3) mg/L 500 435 465 467 167 160 165 164 562 548 430 513 NA NA NA otal Organic Carbon mg/L 7.4 6.9 6.9 7 1.7 2 2.2 2 9.8 6.7 5.8 7 NA NA NA Redox Potential mV -120 9 19 -31 -140 85 61 2 -120 -17 104 -11 NA NA 37 Total BTEX m <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 1 <0.0003 0.0012 <0.0003 Nates: 1.Values with?1.8?are suspected to be unrepresentative and were excluded from calculation of average. 2.Values with<0.1 are below the reliable,analytical-method detection limit Detection limit was used in calculation of average. 3.Samples were collected by a minimum-aeration,minimum-drawdown sampling procedure 4.D.O.and redox potential were measured continuously during well purge and samples were taken when these values stablized. 5.Groundwater elevation climbed 5 feet between 10/1895 and 8115/96.