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17 April 2008 <br /> AGE-NC-07-1586 <br /> Page 2 of 5 <br /> The nearest surface water features in the vicinity of the property are the San Joaquin River and Little <br /> John Creek, located approximately 5 miles southwest and north, respectively, of the site. Ground <br /> water at the site is currently encountered at a depth between 20 and 25 feet below surface grade <br /> (bsg), and has a northwesterly flow direction. Presently, ground water occurs in an interval of <br /> predominantly clayey silt.Informally designated layer 2,this layer is approximately 15 feet thick and <br /> occurs between 20 feet and 35 feet bsg. Apparently discontinuous, 3- to 5-foot thick sand lenses <br /> occur sporadically within layer 2. <br /> 3.0. PROCEDURES <br /> On 06 March 2008, AGE advanced four soil probe boring to a depth of 3 feet (bsg) in areas of <br /> porous concrete to collect soil samples for laboratory analysis. Prior to mobilization, the area of <br /> investigation was clearly marked and a utility clearance was obtained through Underground Service <br /> Alert. <br /> 3.1. SOIL BORING ADVANCEMENT <br /> The four soil probe borings were advanced utilizing a truck-mounted Geoprobe 5400,equipped with <br /> 1.25-inch diameter probe rods with an attached 1.25-inch diameter soil sampler; the sampling <br /> assembly was advanced using"direct push"technology. The Geoprobe advances soil probe borings <br /> using a hydraulic hammer to drive soil sampling tools to specified depths. <br /> 3.2. SOIL SAMPLE COLLECTION <br /> Soil samples were collected at 1 foot and 2 feet bsg.Each sample was collected utilizing a 1.5-inch <br /> Geoprobe soil sampling assembly pre-loaded with four six-inch stainless steel sleeves. After <br /> collection,the ends of the second stainless sleeve was covered with Teflon sheets,capped and sealed <br /> with tape. The sleeve was labeled with soil boring location,depth,time,date and sampler's initials <br /> and then placed in a chilled container. Soil sample duplicates from borings B2 through B4 were <br /> extruded into plastic bags and field-screened for the presence of organic vapors using an organic <br /> vapor meter (OVM), equipped with a photo-ionization detector (PID: MiniRae 2000, 10.0 eV, <br /> calibrated to isobutylene). The soil was then visually described and logged in accordance with the <br /> Unified Soil Classification System(USCS). Soil sample duplicates were not collected from boring <br /> B 1 due to limited sample recovery. <br /> Advanced GeoEnvironmental,Inc. <br />