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5 3 FIELD SOIL CHEMICAL ANALYTIC RESULTS 18 <br /> 5 4 FIELD GROUNDWATER CHEMICAL ANALYTIC RESULTS 18 <br /> 5 5 PERMEABILITY TESTING 19 <br /> 5 6 FIELD QA/QC RESULTS 19 <br /> 5 7 QUARTERLY GROUNDWATER MONITORING RESULTS 20 <br /> ' 6 DISCUSSION 22 <br /> 6 1 GENERAL WATER QUALITY IN THE SITE VICINITY 22 <br /> 6 2 NATURE OF THE RELEASE 24 <br /> ' 6 3 LATERAL EXTENT OF SITE PETROLEUM HYDROCARBON IMPACTS 25 <br /> 6 31 SoiIImpacts 25 <br /> ' 6 3 2 Groundwater Impacts 26 <br /> 6 4 VERTICAL EXTENT OF SITE PETROLEUM HYDROCARBON p,4pACTS 27 <br /> 6 41 Soil Impacts 27 <br /> 64 2 Groundwater Impacts 27 <br /> 6 5 INTRINSIC DEGRADATION OF SITE PETROLEUM HYDROCARBONS 29 <br /> 6 51 Site Concentrahons Declining 29 <br /> 6 5 2 Stable Plume 29 <br /> 6 5.3 Electron Acceptor Utilization 30 <br /> ' 7 Conclusions and Recommendations <br /> 8 References <br /> ' TABLE <br /> 5-1 Summary of Simulprobe soil and groundwater sampling results for boring NP-1 at former <br /> ' Unocal Station No 2959, 1665 Pacific Avenue, Stockton, CA, sampled Jan 4-6, 1999 <br /> FIGURES <br /> ' 1-1 Site Location Map, 1665 Pacific Ave, Stockton, CA <br /> 1-2 Site Plan <br /> ' 3-1 PFezometric contour map of groundwater in the vicinity of Stockton, CA.,Fall 1964 <br /> 4-1 Sunulprobe Sampling Device <br /> ' 5-1 NP-1 Simulprobe soil sampling results <br /> 5-2 NP-1 Simulprobe water sampling results <br /> 6-1 Concentration map-TPHg(ug/L) <br /> ' 6-2 Concentration map-benzene(ug/L) <br /> 6-3 Reproduction of TPHg Iso Concentration Contour Map,May 1990 <br /> 64 Reproduction of Benzene Iso Concentration Contour Map, May 1990 <br /> 6-5 Concentration map-Nitrate as Nitrate(mg/L) <br />