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%MOP <br /> 07 August 2001 <br /> AGE-NC Project No. 99-0605 <br /> Page 5 of 6 <br /> 4.3. ANALYTICAL RESULTS OF GROUND WATER SAMPLE <br /> Grab ground water sample B2 contained TPH-mo at a concentration of 360 micrograms per liter <br /> La (ug/l),while TPH-g, TPH-d,'MTBE, BTEX, DIPE, ETBE, TAME, TBA, methanol, ethanol, EDB <br /> and 1,2-DCA were not detected above laboratory reporting limits. <br /> The analytical result of the ground water sample is summarized in Table 5. The laboratory report <br /> (MAI Lab Number 60637) and chain-of custody form are included in Appendix B. <br /> 5.0. DISCUSSION <br /> MTBE was detected in three of the eleven soil samples analyzed at concentrations ranging from <br /> 63 gg/mg to 1,200µg/mg. MTBE contamination was limited to samples collected between 20 feet <br /> and 50 feet bsg from soil boring B-2, located within the former UST excavation.. An estimated <br /> l4. 0.837 kg of MTBE remain at the site. <br /> MTBE was not detected in the ground water sample collected from B-2. However, TPH-mo was <br /> 4 detected in the ground water sample collected from B-2 at a concentration of 360/.zg/l. <br /> 6.0. RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends: <br /> Lo <br /> • Installation of four soil borings - two soil boring will be completed as soil vapor extraction <br /> v observation wells, one soil boring will be completed as a soil vapor extraction well and the <br /> final soil boring to verify the eastern most extent of the MTBE impacted soil. <br /> • Initiation of an interim soil vapor extraction remediation treatment system at the site to <br /> +� mitigate the existing MTBE threat to the local ground water. <br /> • Installation and monitoring of one ground water.monitoring well to monitor for an MTBE <br /> LW impact to-the local ground water over the duration of the interim remediation process. <br /> ay <br /> Advanced GeoEnviroamental,Inc. <br /> v <br />