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ARCADIS GERAGHTY&MILLER <br /> S. RESULTS............... ...... .................... . . ................... ........................................21 <br /> 5.1 MONITORING WELL INSTALLATION. . . .................................... ........................................21 <br /> 5.2 SITE SUBSURFACE STRATIGRAPHY.............. ........................................ ....................»........21 <br /> 5.3 FIELD SOIL CHEMICAL ANALYTIC RESULTS................ ............................................. .....22 <br /> 5 3 1 Bonng NP-1 22 <br /> 5 3 2 Bonng NP-2 23 <br /> 5 4 FIELD GROUNDWATER CHEMICAL ANALYTIC RESULTS....... ............. .............................24 <br /> 5 4 1 Boring NP-1 24 <br /> 5 4 2 Boring NP-2 25 <br /> 5.5 FIELD QA/QC RESULTS..... ................................................ ......... ..........................................26 <br /> 5 6 QUARTERLY GROUNDWATER MONITORING RESULTS........... .............................................28 <br /> 6. DISCUSSION ...... .. ...... ................... .................... .. . . ....................................30 <br /> 6.1 GENERAL WATER QUALITY IN THE SITE VICINITY . .......................................................30 <br /> 6 2 NATURE OF THE RELEASE.... .......................... ...... ............. .... .... ... ............................33 <br /> 6 3 LATERAL EXTENT OF SITE PETROLEUM HYDROCARBON UW PACTS .................35 <br /> 6 3 1 Sod Impacts 35 <br /> 6 3 2 Shallow Groundwater Impacts 35 <br /> 6 3 3 Deep Groundwater Impacts 36 <br /> 6 4 VERTICAL EXTENT OF SITE PETROLEUM HYDROCARBON E%IPACTS.. ............ .............37 <br /> 6 4 1 Soil Impacts 37 <br /> 6 4 2 Groundwater Impacts 38 <br /> 6 4 3 Conceptual Model of Site Constituent Distribution and Migration 40 <br /> 6.5 INTRINSIC DEGRADATION OF SITE PETROLEUM HYDROCARBONS............. .....................41 <br /> 6 5 1 Site Concentrations Declizang 41 <br /> 6 5 2 Stable Plume 41 <br /> 6 5 3 Electron Acceptor Utilization 43 <br /> 6 5 3 1 Dissolved Oxygen 44 <br /> 6 5 3 2 Nitrates 44 <br /> 6 5 3 3 Iron(11) 45 <br /> 6 5 3 4 Sulfates 45 <br /> 6 5 3 5 Methanogenesis 46 <br /> 7. CONCLUSIONS............................ ............ ..... ................... ...... ..........................47 <br /> & REFERENCES.......................... ...................................... ......................................60 <br />