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1 <br /> 24 March 2004 <br /> i AGE-NC Project No 97-0301 <br /> ' Page 7 of 7 <br /> SAND/silty SAND was generally observed at depths between 35 and 50 feet bsg,60 and 80 <br /> feet bsg, 90 and 100 feet bsg and 110 and 125 feet bsg The modeled site stratigraphy is <br /> shown in Figures 3 and 4 <br /> ' • Soil samples collected from MW-8 detected significant TPH-g,TPH-k and BTEX at 20 feet <br /> bsg, lesser concentrajjgns of TPH 1JTEX and 1,2-DCA were detected from MW-8 at <br /> depths of 35 feet andW etg, w xylene concentrations were detected from MW-12 at <br /> ' 50 feet and 80 feet bsg (Figures 15 and 16) <br /> • Based on current and previous soil data, the distribution of contaminants at the site, in <br /> ' conjunction with the site stratigraphy as described above, suggests a narrow,vertical plume <br /> of impacted soil descending from the eastern edge of the former UST area, and spread <br /> laterally upon encountering the ground water table at 35 feet bsg The vertical extent of <br /> ' impacted soil near this former north UST area was marginally defined by soil samples from <br /> well MW-7 This model is shown in Figures 15 and 16 <br /> 1 <br /> 50. RECOMMENDATIONS <br /> lie • With the addition of multi-level wells MW-8 through MW-12,AGE recommends continued <br /> quarterly ground water monitoring at the site <br /> ' • Based on the entire set of data collected, additional ground water monitoring wells/soil <br /> borings are not warranted at this time and the existing monitoring well network are <br /> ' apparently sufficient to complete a site Corrective Action Plan (CAP) <br /> ' 6.0. LIMITATIONS <br /> i <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> ' environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the geologiclhydro- <br /> ' geologic conditions at the site for the purpose of this investigation was made from a limited number <br /> of available data points (ground water samples), and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> ' conclusions and recommendations contained in this report <br /> Advanced GeoEnvirOmnental,Inc <br /> 1 <br />