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, <br /> � v <br /> 26 April 2011 <br /> AGE-NC Project No. 03-1100 <br /> Page 4 of 6 <br /> 4.0. FINDINGS <br /> Soil stratigraphy was determined from field data collected on 26 and 27 January 2011. <br /> Petroleum hydrocarbon impact to soil and ground water was quantified by laboratory <br /> analytical data. <br /> 4.1. STRATIGRAPHY <br /> During the advancement of borings OW1 through OW10 soil sample duplicates were <br /> collected from selected borings between 11 and 15 feet bsg to evaluate subsurface <br /> lithology. Based on samples collected, the site is generally composed of alternating layers <br /> of clay and silty sand to a depth of 16 feet bsg. Clays encountered during hand clearing <br /> (surface to five feet bsg)were generally described as gray and containing hydrocarbon-like <br /> odors. Clays and silty sands encountered between 13.5 and 15 feet bsg were generally <br /> characterized as brown, moist to saturated and contained either slight or moderate <br /> hydrocarbon odor. Excavation road base and pea gravel was encountered from surface <br /> grade to depths between 5 feet and 7 feet bsg during the advancement of borings OW7 <br /> through OW10. <br /> Boring logs showing the lithology encountered during the advancement of wells OW1 <br /> through OW10 are included in Appendix D. All boring logs were uploaded to the State <br /> Geotracker database and are referenced under confirmation numbers 6199815154, <br /> 8783284008, 1833871424, 8931462109, 7914460182, 7372216761, 9677423059, <br /> 4697385430, 7345917701, 6421552300. <br /> 4.2. LABORATORY RESULTS OF SOIL SAMPLES <br /> A total of four samples were submitted to CTEL for analysis of the constituents of concern <br /> listed in section 2.1. Benzene, ethylbenzene, and xylenes were detected in the samples <br /> collected from borings OW2 and OW4 at maximum concentrations of 0.012 milligrams per <br /> kilogram (mg/kg) benzene, 0.022 mg/kg ethylbenzene and 0.030 mg/kg total xylenes <br /> (OW4-14). <br /> No other constituents of concern were detected in the soil samples analyzed. The <br /> analytical results of selected soil samples are summarized in Table 2.The laboratory report <br /> (CTEL Project No. 214-1101202)and chain-of-custody forms are included in Appendix G. <br /> The analytical results were uploaded to GeoTracker, and are referenced by confirmation <br /> number 6201413750. <br /> Advanced GeoEnvironmental,Inc. <br />