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Table 4 <br /> Summary of ITB Geocbemiral Indicatiors <br /> Del Monte Disco Site <br /> Stockton,California <br /> Well No. MW-DIS-I MW-DIS-2 in the BTEXplume) MW-DIS-3(plume fringe) MW-DIS-4(background) <br /> Sampling Date 12/20/96 10/18/95 4118196 8115/96 12/20/96 Average 10/18/95 4118196 8115196 12/20/96 Average 10/18/95 4118196 8115196 12120/96 Avera a <br /> Parameter Units <br /> Dissolved Oxygen mg/L <0.5 <0.5 <0.5 <0.5 <0,5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 ?1.8? 4.5 4.6 4.6 4.6 23 <br /> Nitrate-N mg/L <0.05 <0.02 <0.02 <0.01 <0.05 <0.02 <0.02 <0.02 <0.01 <0.05 <0.02 6.8 5.06 5.24 4.4 5.4 <br /> Ferrous Iron(Fe2+) mg/L 2.3 1.28 0.529 0.863 0.768 0.9 0.0509 <0.025 <0.1 <0.1 0.041 ?9.54? <0.025 <0.1 <0.1 0.1 <br /> Sulfate mg1L 2.12 7.9 1.98 5.84 2.73 4,6 8 8.53 7.92 8.91 8.3 10.3 10.4 11.1 9.5 i0.3 <br /> Dissolved Methane mg1L 0.0404 0.002 0.0042 0.0034 0.00538 0.0037 0.002 0.00096 0.001 0.0021 0.0015 0.001 0.0069 <0.0013 <0.00041 0.002 <br /> Alkalinity(as CaCO3) mg/L 380 468 395 489 352 426 45I 418 398 388 414 463 420 435 412 433 <br /> Total Organic Carbon mg/L 10.2 9.2 11.7 8.4 1.2 7.6 5.1 4.8 6.1 1.4 4.4 5.4 4.8 8.1 2.1 5.1 <br /> Redox Potential mV -188 -140 -172 -173 -219 -176 -250 -82 3 -24 -88 ?-100? 207 134 125 155 <br /> Total BTEX m 20.59 1 1.008 5.76 0.314 0.327 1.9 <O.0003 <0.0003 <0.0003 0.0022 0.0007 NA NA NA 0.0024 0.0024 <br /> Well No. MW-DIS-BS(plume frin a MW-DIS-BD(plume,fringe) MW-DIS-9(plume c/bac ound <br /> Sam 1' Date 10/18/95 4118196 8115196 12120!96 Average 10/18/95 4/18196 8/15196 12,120/96 Average 10/18/95 4118196 8115/96 12!20/96 Average <br /> Parameter Units <br /> Dissolved Oxygen mg1L <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 1.8 1.3 1.5 1.2 0.8 <0.5 4 2.8 2.0 <br /> Nitrate-N mg1L 4.4 0.04 3.47 1.19 2 3.1 2.52 3.17 2.9 3 8.2 8.54 7.41 19.0 10.8 <br /> Ferrous Iron(Fe2+) mg/L 1.04 <0.025 <0.1 <0.1 0.29 <0.025 <0.025 <0.1 <0.1 <0.05 <0.025 <0.025 <0.I <0.1 <0.05 <br /> Sulfate mg/L 24.9 20.3 22.7 22.0 22 10.6 9.54 10.8 11.9 11 29.9 33.5 47 50.6 40 <br /> Dissolved Methane mg/L 0,0012 0.0068 0.0024 0.0187 0.003 0.001 0.0019 <0.002 <0.00025 0.0010 0.0007 0.0011 <0.0012 <0.00027 0.0006 <br /> Alkalinity(as CaCO3) mg/L 500 435 465 448 462 167 160 165 174 167 562 546 430 460 500 <br /> Total Organic Carbon mg/L 7.4 6.9 6.9 <1.0 7 1.7 2 2.2 <1.0 2.7 9.8. 6.7 5.8 2.7 6 <br /> Redox Potential mV -120 9 19 22 -18 -140 85 61 28 9 -120 -17 104 100 17 <br /> Total BTEX m <0.0003 <0.0003 <0.0003 0.0025 0.0007 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 <0.0003 0.0029 0.0008 <br /> Well No. MW-DIS-10(plume e) <br /> Sam 1" Date 10/18/95 4/18/96 8115196 <br /> Parameter Units <br /> Dissolved Oxygen mg/L NA NA 0.3 <br /> Nitrate-N mg/L NA NA NA <br /> errous Iron(Fe2+) mg/L NA NA NA <br /> Sulfate mg/L NA NA NA <br /> Dissolved Methane mg/L NA NA NA <br /> Alkalinity(as CaCO3) mA NA NA NA <br /> Total Organic Carbon mg/L NA NA NA <br /> Redox Potential mV NA NA 37 <br /> Total BTEX m <0.0003 0.0012 <0.0003 <br /> Notes: 1.Values with?1.8?are suspected to be unrepresentative and were excluded from calculation of average. <br /> 2.Values with<0.1 are below the reliable,analytical-method detection limit. Detection limit was used in calculation of average. <br /> 3.Samples were collected by a minimum-aeration,minimum-drawdown sampling procedure <br /> 4.D.0.and redox potential were measured continuously during well purge and samples were taken when these values stablized. <br /> 5.Groundwater elevation climbed 5 feet between 10/18/95 and 8115196. <br /> ItbrSltS.XIS <br />