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i 1 <br /> 5 <br /> 1 S <br /> 45'feet bsg from pilot boring MW-8 Analytes of concern were not detected in the soil samples <br /> collected and analyzed from pilot borings MW-6 and MW-7 <br /> IaOctoher 1999 - Seven soil borings (B-10 through B-16) were advanced to collect and analyze soil <br /> samples, in addition, one soil sample collected from boring B-11 was analyzed for permeability, <br />' porosity, total organic content and specific gravity Petroleum hydrocarbon-impacted soil was <br /> detected in soil samples collected from all soil borings except B-l3,the highest concentrations were <br /> detected in sorb samples collected from boring B-10, located adjacent to the former UST No 3 ' <br /> 1 , <br /> excavation <br /> July 2001 - An 8-hour step draw-down ground water extraction pilot test was conducted at the site <br />' High concentrations of petroleum hydrocarbons were detected in extracted ground water samples i <br /> November 2004 - Based on the results of the July 2001 pilot test, a 24-hour constant rate ground <br />' water extraction feasibility test was performed at the site Detected concentrations of target analytes' <br /> in extracted ground water samples were significantly lower than those reported for the July 2001 y <br />' pilot test r <br /> } <br /> Ground Water Monitoring <br /> 1 } 1 <br /> Based on analytical results of ground water samples collected during quarterly monitoring and site <br />' assessment activities,the lateral extent of impacted soil has been defined to the north,east and west <br /> However, the vertical extent of the contamination plume, as well as the lateral extent to the south, <br /> 1 is not well defined ' <br /> Cluster UST Area (North Area) <br /> December 1998-'Two 10,000-gallon USTs and one 6,000-gallon UST were removed from a <br /> common excavation at the site <br /> October 1999 r AGE advanced one soil boring(B-9)for collection of soil and groundwater samples <br /> Significant concentrations of petroleum hydrocarbons were detected in samples collected from the ` <br />' boring Based on the findings from bonng B-9,monitoring wells MW-9 and MW-10 were installed <br /> near the former UST excavation area I ' <br /> July 2000 - Nme ,piloot borings were advanced at the site for installation of monitoring wells <br /> MW-11A/B through MW-13A/13, air-sparging well AS-1 and groundwater extraction wells EW-1 <br /> and EW-2 Petroleum hydrocarbons were detected in soil samples-co.Ilec ted.from pilot bonngs EW-1 <br /> and MW-13B <br /> 1 , <br /> November 2002 - Four pilot borings were advanced at the site for installation of monitoring wells <br />' MW-14A/B and MW-1'5A/B Target analytes weremot detected above laboratory`reporting limits <br /> in the soil samples submitted for analyses a <br />