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ius Ns <br /> 28 January 2005 <br /> AGE-NC Project No 96-0232 <br /> Page 5 of 8 <br /> MTBE-Impact to ground water was assessed and quantified by laboratory analysis <br /> 31 STRATIGRAPHY <br /> Generally,less permeable,fine sandy silts and clayey silts were encountered at a depth of 15 feet bsg <br /> and between 30 and 35 feet bsg, more permeable, silty fine sands and fine to medium sands were <br /> encountered at depths between 20 and 30 feet bsg and between 40 and 50 feet bsg A boring log for <br /> MW-20 is Included in Appendix B General lithology beneath the site is depicted in cross-section <br /> E-E' in Figure 3 <br /> 32 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL <br /> No hydrocarbon odor was encountered in duplicate soil samples collected from soil boring MW-20 <br /> at depths between 15 and 50 feet bsg Petroleum hydrocarbon odor notations are included on boring <br /> logs contained in Appendix B <br /> Utilizing a PID (Thermo Environmental 580B, 10 0 eV, calibrated to isobutylene) meter, organic <br /> vapor was observed in soil sample duplicates from MW-20 at depths of 25 feet, 40 feet and 50 feet <br /> at concentrations over 1,000 parts per million(ppm) Organic vapor field measurements are recorded <br /> on the boring logs contained in Appendix A <br /> 33 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> Three of the soil samples(MW20-20,MW20-35 and MW20-45) submitted to CTEL were analyzed <br /> for petroleum hydrocarbons, two of the soil samples(MW20-25 and MW20-45)were analyzed for <br /> Title 22 metals and general minerals <br /> Petroleum hydrocarbons were not detected in the analyzed soil samples <br /> Barium, total chromium, copper, vanadium and zinc were detected in samples MW20-25 and <br /> MW20-45 at concentrations as high as 75 milligrams per kilogram (mg/kg), 17 mg/kg, 28 mg/kg, <br /> 28 mg/kg and 78 mg/kg, respectively, in sample MW20-25, iron was detected from the same <br /> samples at concentrations as high as 18,000 mg/kg No other metals were detected from laboratory <br /> analysis <br /> Sulfate was detected in samples MW20-25 and MW20-45 at concentrations of 220 mg/kg and <br /> 160 mg/kg,respectively,pH was reported at 6 04 and 6 67,respectively No other general minerals <br /> Advanced GeoEnvironmental,Inc <br />