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' Geolo rtafTechims lite Pae 5 <br /> S011Groundwater Investigation Report g <br /> J M Equipment <br /> 116 Project No 507 2 <br /> July 5,2001 <br /> 3.1 Soil Analytical Results <br /> In summary <br /> • None of the soil samples collected from borings SB-6, MW-7 & MW-10 contained <br /> contaminant concentrations above the laboratory reporting limits <br /> ' • The soil sample from MW-109 @ 80 feet bgs did not contain contaminant <br /> concentrations above the laboratory reporting limits <br /> ' 32 Soil Geophysical Results <br /> The following Tables summarize the data obtained from the laboratory geophysical analyses <br /> performed by Cooper Testing Lab Inc (Cooper) <br /> Sample Particle Size Distribution soil <br /> ' rave o an o silt o Clay o Classification <br /> w san <br /> MW-10 @ 25' - w trace san <br /> MW-10 @ 30' - w san <br /> ' MW-109 @ 75' - 30 553 41 7 CLAY silty <br /> SB-6 @ 35' Silty SAND <br /> Sample PermeabilityOrganic,,; Density Porosity <br /> (cili/sec) % (dry) % <br /> x - <br /> MW-10 @ 25' 1 x <br /> MW-10 @ 30' 9 x <br /> MW-109 @ 75' 3 x 10 E--6-- <br /> SB-6 @ 35' 2 x 10E-4 08 1038 3842 <br /> ' The site is underlain with silts, clays and sands The range of permeability's suggest that <br /> contaminants should have limited mobility in the silt/clay layers, and greater mobility in the <br /> ' sand layers at depths of 30 -- 35 feet bgs in boring SB-6 The high porosity values in the <br /> silt/clays indicate a greater retention of impacted water that is consistent with site data The <br /> high core pluinc concentrations evident in well MW-9 are not present in down gradient <br /> ' wells MW-6 or MW-2 <br /> The low organic content indicates a low propensity for absorption in soils and this is not a <br /> favorable condition for remediation by natural attenuation <br /> 1 3.3 Site Geology and Field Observations <br /> ' The following section discusses the subjective field observations and geology documented <br /> during this investigation based on the interpietations of the field geologist <br /> ' e The geology of the site was field logged as predominately clays and sandy clays with <br /> lesser aanounts of silts and sands The clays range from brown to blue-green, and <br /> contained varying amounts of carbonate nodules, black organic materials and iron oxide <br /> staining [The Coopei laboratory data correlates well with the data in the boring logs <br />