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Ms Margaret Lagorio Project No 880-040 IA <br />' November 8, 2002 <br /> Page 6 <br /> • Groundwater flow rate was measured with a paddle wheel style flow <br />' meter/totalizer, <br /> • Real-time vapor-phase VOC concentrations were screened in the field <br /> using instruments calibrated as Hexane with a maximum range of <br /> 10,000 parts per million by volume, <br />' • Vacuum influence in surrounding wells was measured utilizing magnehelic <br /> pressure gauges, <br /> • Groundwater influence in surrounding wells was measured utilizing <br /> pressure transducers, <br /> • Grab soil-vapor and groundwater samples were sent to an analytical <br />' laboratory for quantification Soil-vapor and groundwater samples were <br /> analyzed for TPHg by EPA Method 8015 Groundwater samples were <br /> analyzed for BTEX by EPA Method 602, and for the five oxygenates by <br /> EPA Method 8260B (modified) Soil-vapor samples were analyzed for <br /> BTEX by EPA Method 8020, and for the five oxygenates by EPA <br /> Method 8260B <br />' SITE INVESTIGATION RESULTS <br /> Subsurface Investigation <br /> Soil Sample Results <br /> The soil samples analyzed during this site investigation (maximum explored depth of <br /> approximately 54 feet bgs) consisted of interbedded sand, silty sand, sandy silt, and <br /> sandy clay A more complete description of the subsurface lithology is shown on the <br /> boring logs included in Attachment E <br />' Groundwater was encountered at approximately 13 feet bgs Groundwater on-site is <br /> flowing to the north-northeast at a gradient of approximately 0 002 Groundwater <br /> elevations and contours from the Third Quarter 2002 sampling event are presented on <br /> Figure 3 <br /> NIrancfpllProjectslProjects188010401l a101101Assessment and Interim Remedial Report doc <br />