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1 <br /> locking, water-tight well plug was installed on the well and a water-tight, locking wellbox <br /> ' labeled "monitoring well" was concreted over the well The wells were developed in accordance <br /> with the accepted industry standards <br /> 1 After installation, the wellheads were surveyed vertically and horizontally m to a common datum <br /> ' and depth-to-water readings were utilized to calculate the groundwater flow direction beneath <br /> the project site <br /> ' GROUNDWATER SAMPLING AND ANALYSIS S S M ETHODS <br /> ' After the monitoring wells were installed the wells were monitored for free product Water <br /> samples were collected with a teflon bailer atter purging a minimum of three well volumes <br /> Samples were collected in glass containers, preserved, sealed, labeled and transported on ice in <br /> an air tight cooler The samples were analyzed by State certified RESNA Analytical Laboratory <br /> ' for BTEX (EPA method 8020) and TPHG (EPA method 503018015) <br /> RESULTS OF THE INVESTIGATION <br /> ' SOIL LITHOLOGY <br /> Soils encountered in the borings for the most part consisted of interbedded silts and clays from <br /> ' the surface to total depth Minor, sandy horizons were penetrated at approximately 25', 45', <br /> and 75' below grade <br /> 1 <br /> RESULTS OF SOIL ANALYSIS <br /> ' Three soil samples were collected for analysis from each boring/well Sample selection was <br /> based upon PID readings and the determination of soil/groundwater interface soils Benzene was <br /> ' present above method detection limits in well MW2 at 55 5 and 65 feet below grade (0 040 ppm <br /> and 0 080 ppm) and in well MW3 at 55 5 and 65 feet below grade (0 14 ppm and 0 34 ppm) <br /> ' The 65 foot sample from MW3 also contained 0 021 ppm xylenes and 2 2 ppm TPHG No <br /> other analytes were detected in any soil sample <br /> R-052992 LF 7 <br />