Laserfiche WebLink
27 March 2000 <br /> AGE-NC Project No. 98-0450 <br /> Page 5 of 19 <br /> Significant benzene concentrations were also detected below the former northern dispenser <br /> island at depths of 25 feet bsg to 35 feet bsg. <br /> • The greatest concentrations of MTBE were detected in soil below the former t IS"I's at depths <br /> of I lect bsg to 30 feet bsg. MTBE was detected in soil samples from SB 1. SB4. 5135. SB6 <br /> and SBT The highest concentration, at 9 200 ug/kg. was encountered at a depth of 30 feet <br /> bsg in the former UST area in soil boring SB4. <br /> • Generally the highest concentrations of"FBA were detected in soil below the lormer US I's <br /> and in the area of the iornler northern dispenser island at depths of25 feet bsg to 35 feet bsg. <br /> ETBE was also detected below the lormcr northern dispenser island. <br /> • The porosity ofthe soil collected from a depth 35 feet bsg from the site was measured to be <br /> approximately 40%. <br /> • A cross section of the former UST area on the site is depicted in Figure 3. <br /> 2.6.3. 1 lvdrocarbon Impacted Ground Water <br /> Analytical results of the ground water sample analyzed are summarized in Quarterly Reports <br /> prepared by AGE. <br /> • The plume of impacted `.around water is constrained on its northern edge by the grab ground <br /> water sample collected from soil boring SB2. <br /> • The plume of impacted ground water with concentrations above 10 pg/I of benzene is <br /> constrained on its western edge of the former USTs by wells 13M W-1. BMW-2 and BMW-3. <br /> • The plume of impacted ground water above 10 �i.gll of benzene is constrained on its eastern <br /> and southeastern cadge of the former USTs by welts BMW-5 and somewhat on the south by <br /> well MW-5. <br /> • Significant concentrations of dissolved benzene and MTBE reside in ground water in the <br /> former UST area. <br /> • The ground water flow direction has been generally toward the south and sholitly southeast <br /> during the past two rears of ground water monitoring. <br /> • The dissolved hydrocarbon concentrations detected in February 2000 are depicted in Figure <br /> 4 <br /> lderrrarerl(:eEa E.ncErunnlrEEt cl,IEIC. <br />