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i <br /> 1 ' <br /> Ms Margaret Lagorio <br /> • Page 4 of 8 <br /> 1 <br /> The new well was by developed by surging and pumping each until turbidity was minimized During the <br /> ' well development process, temperature, pH, and electrical conductivity were measured and allowed to <br /> stabilize pnor to sample collection Purge water was placed into DOT approved 55-gallon drums, which are <br /> currently stored on site pending disposal Groundwater samples were placed in an iced cooler and <br /> ' submitted under chain of custody protocol to Argon Laboratory for analysis of TPHg, BTEX, gasoline <br /> oxygenate additives, 1,2 DCA,and EDB by EPA methods 8015, 8020 and 8260 A well development log is <br /> included in Attachment B <br /> ' Decontamination Procedures <br /> ' All drilling and sampling equipment was decontaminated by steam cleaning and/or washing with <br /> laboratory-grade detergent during all drilling and sampling activities Decontamination water and soil <br /> cuttings were placed into properly labeled DOT approved 55-gallon drums The drums are being <br /> stored on site pending disposal <br /> ' RESULTS <br /> Subsurface Conditions <br /> ' CPT and traditional (ASTM Designation D2488-90) soil logging methods were used for soil <br /> classification, however, CPT data was primarily used to identify the following soil units <br /> Urut A)Extends from the ground surface to approximately 60 feet bgs and generally consists of silts <br /> and clays with minor sand lenses <br /> ' Unit B)Present from approximately 60 to 90 feet Two distinct CPT marker beds lie at depths of <br /> approximately 75 feet bgs and 88 feet bgs This unit is primarily sandy with interbedded silt The <br /> ' most permeable sand is found from approximately 65/70 to 80 ft <br /> Unit C)Soil in this unit is composed primarily of clay, however, some silt was also present It is found <br /> ' from approximately 90 to 105 feet bgs <br /> Unit D)From approximately 105 to 1151120 feet, this is an interval of interbedded sands and <br /> ' silts/clays The most permeable interval occurs from approximately 105 to 110 feet <br /> Unit E)This Unit is composed primarily of silts and clays, and begins at depths of approximately <br /> ' 1151120 feet bgs and extends to total depth of borings CPT 1 and CPT5 <br /> Units B and D have the potential to provide preferential groundwater contamination flow due to their <br /> ' higher permeability and lower sorption potential <br /> 1 <br /> ' Aodcic]muecanthavgdac <br />