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21 March 2011 <br />AGE-NC Project No. 10-1810 <br />Page 2 of 5 <br />The scope of work included submittal of a work plan, boring permits and regulatory <br />oversight fees to the SJCEHD and the advancement of one soil boring in the area of the <br />former UST area, for the collection of soil and grab ground water samples. <br />SOIL PROBE BORING ADVANCEMENT <br />On 13 and 14 January 2011, AGE advanced eleven soil borings (B-1 through B-11) in <br />identified areas of concern (Figure 2). Soil borings B-1 through B-3 and B-6 through B-11 <br />were advanced to depths of between 10 feet and 80 feet below surface grade (bsg) <br />utilizing a 25-ton truck-mounted drill rig, equipped with 1.75-inch diameter hollow-stem <br />rods fitted with a sampling assemblies. The rig advances soil probe borings using a <br />hydraulic ram to drive soil sampling tools to specified depths, for collection of soil samples <br />and grab ground water samples. Grab ground water samples were collected from borings <br />B-2 and B-3; AGE notes that a grab ground water sample was not recoverable from boring <br />B-1. Borings B-4 and B-5 were advanced to a depth of 5 feet bsg utilizing a hand auger, <br />for collection of soil samples. Soil boring locations are illustrated on Figure 2. <br />SOIL AND GRAB GROUND WATER SAMPLE COLLECTION <br />Soil samples collected from borings B-4 and B-5 were hand-packed into stainless steel <br />sampling sleeves. Soil and grab ground water samples from the direct push borings were <br />collected utilizing sampling assemblies pushed to specified sampling depths. <br />Soil samples were collected by pushing a steel-tipped, piston soil sampling assembly, into <br />a specified zone, then the tip was withdrawn to expose a core barrel; the soil sampler was <br />then pushed down again to retrieve a 1-foot soil sample. Upon soil sample retrieval, a <br />stainless steel sleeve was removed from the sampler. The ends of the stainless steel <br />sleeve were immediately covered with Teflon sheets, sealed with plastic end caps, and <br />secured with tape. The sleeve was labeled with soil boring location, depth, time, date and <br />sampler's initials and then placed in a chilled container. Soil sample duplicates were <br />extruded into plastic bags and field-screened for the presence of organic vapors using an <br />organic vapor meter (OVM), equipped with a photo-ionization detector (PID). <br />Grab ground water samples were collected from borings B-2 and B-3 utilizing a <br />HydroPunch ground water sampling assembly. A HydroPunch sample tool was pushed into <br />a specified zone, then withdrawn approximately two to three feet to expose an inlet screen <br />to collect a grab ground water sample. The interior of the sampling tool filled with water and <br />a 1/2-inch outer diameter (0.D.) stainless steel bailer was lowered and utilized to extract a <br />ground water sample. Ground water samples were collected from the water table based <br />on ground water data from the area (80 feet bsg). Sufficient sample was collected to fill <br />four 40-ml EPA-approved VOA vials and one 1-liter amber glass container. Ground water <br />Advanced GeoEnvironmental, Inc.