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05 March 2004 <br /> AGE-NC Project No 99-0559 <br />' Page 10 of 11 <br /> • Over the two quarters of the reporting period, the highest concentrations of petroleum <br />' hydrocarbons detected at the site were present in the ground water samples collected from <br /> wells screened In HU1 and HU2 at the UST area In addition, high concentrations of <br /> petroleum hydrocarbon compounds were detected at all sample depths in well MW-7 <br />' a The concentrations of TPH-g appeared to decreased overall, except in the sample from well <br /> MW-6A Also the concentrations of BTEX compounds and MTBE decreased or remained <br />' essentially unchanged,except in well MW-6 which indicted an increase m BTEX compounds <br /> and MTBE concentrations <br />' • Overall lower concentrations of TPH-g and BTEX compounds were detected in well MW-8 <br /> relative to the previous quarter <br /> • TBA, TAME and 1,2-DCA were detected in samples from the former UST area, and down- <br /> gradient of the UST area <br /> • The vertical extend of impacted ground water, at the former UST area,has not been defined <br />' at the site The lateral extent of shallow impacted ground water towards the west and <br /> southwest, down-gradient of the UST area, has not been defined The vertical extent of <br /> impacted ground water at the western and southern edge of the site are defined, by well <br /> MW-5 and to a lesser degree by MW-6 <br />' 5.0. RECOMMENDATIONS <br /> IBased on the findings and conclusions in this report, AGE recommends the following <br /> • Continue quarterly ground water monitoring,the next quarterly monitoring event is scheduled <br /> for March 2004 <br /> • Installation of additional monitoring CPT soil and ground monitoring points west and <br /> southwest of the site to define the lateral extent of petroleum hydrocarbons-impacted ground <br />' water <br /> • Installation of additional shallow to intermediate depth ground water extraction wells on the <br /> southern margin of the site, to work with ground water extraction system to minimize the <br /> lateral migration of petroleum hydrocarbons-impacted ground water <br /> I <br /> IAdvanced GeoEnvironmental,Inc <br />