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CAMBRIA <br /> s <br /> Vent Lines: One sample was collected at a depth of 2 0 fbg beneath the former vent lines <br /> No TPPH, BTEX, or MTBE was detected <br /> CONCLUSIONS <br /> A large amount of impacted soil (over 625 cubic yards) was removed from the site during the <br /> course of excavation <br /> Soil in the UST area was excavated to ND concentrations with the exception of sample <br /> TS-10 which contained MTBE at a concentration of 0 395 ppm Since the over-excavation <br /> was performed on February 4, 1999, SSSEC has excavated the area further to install the new, <br /> larger USTs <br /> The areas beneath Dispenser I and 2 were excavated to the limit of the backhoe Soil <br /> beneath Dispenser 1 (DS-7) contains a residual benzene concentration of 0 00808 ppm and <br /> an MTBE concentration of 3 50 ppm at 8 0 fbg Soil beneath Dispenser 2 (DS-6) contains a <br /> residual TPPH concentration of 706 ppm, a benzene concentration of 0 962 ppm, and an <br /> MTBE concentration of 60 4 ppm at 12 5 fbg Soil beneath Dispenser 3 (DS-5) contains a <br /> . residual MTBE concentration of 1 91 ppm at 5 5 fbg <br /> Piping areas were excavated to ND levels with the exceptions of samples PL-10 and PL-11 <br /> Soil beneath PL-11 contains a residual MTBE concentration of 0 106 ppm The area near <br /> PL-9 was excavated using a shovel due to the presence of conduits and water lines Soil <br /> beneath this area contains a residual benzene concentration of 0 0105 ppm and an MTBE <br /> concentration of 2 93 ppm <br /> RECOMMENDATIONS <br /> Based on soil analytical results, Cambria recommends further investigation in the areas near <br /> Dispensers 1, 2, and 3 and product line sample PL-9 <br /> • <br /> 241-1346 5 <br />