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= rr <br /> 10 April 2001 <br /> AGE-NG Project No 96-0235 h a <br /> I Page 4"of 5 <br /> L <br /> , 1 <br /> i , 3 <br /> - = <br /> • Ground water flow within the Iower monitored interval appears to have been toward the east, <br /> ground water flow in the upper er interval appears ears to have been toward the east to northeast <br /> � �' <br /> t s • TPH-g and BTEX compounds were detected in groundwater samples collected from MW`1, <br /> MW-2 and EW-2 TBA was detected in samples collected from MW-2 and MW-6B The <br /> sample collected from MW-2 contained d detectable concentration of 1,2-DCA <br /> w • MTBE was not detected in any of the ground water samples collected from the former UST <br /> No 3 excavafion area <br /> ' r � ' <br />' T • The lateral extent of the plume of impacted ground water is not well defined to the south <br /> 'Based on the data collected from the former UST cluster area, AGE finds n <br /> T • TPH-g was detected m samples collected from MW-10, MW-11B and EW-1 at , <br /> concentrations as high as 39,000 }rg/l TPH-d was detected in samples collected from <br /> MW-10, MW-11B, MW-12A, MW-13A, MW-13B and EW i at concentrations as high as <br /> 60,000 �Lg/l <br />' BTEX compounds were detected in samples collected from MW-10, MW-11 B, MW-13B <br /> and EW-1 Benzene was detected at concentrations as high as 970 Pg/1 <br />' • MTBE was detected in the lower screened wells MW-9, MW-11B, MW-12B and MW-13B <br /> and in shallow wells MW-10, MW-13A and EW-1 at concentrations as high as 280 µg/1 <br /> r r The most impacted ground water appears to be centered around EW-1 and MW-10,deeper <br /> ground water A less intensely impacted The lateral-extent of the contamination plume in ` <br /> ground water is not well defined in the area of the former UST cluster <br />' Ground water flow in the area of the former UST cluster was generally toward the southeast <br /> in,the lower monitored interval and toward the east-northeast in the upper interval <br /> w <br /> r <br /> - -Tr5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> a] . <br />' Preparation of a work plan addendum'for additional assessment of soil and groundwater at <br /> the former UST cluster location "to define the vertical and lateral extent of hydrocarbon F <br /> contamination L <br /> . • Following completion 'of-lateral and `vertical assessment of impacted ground water, <br /> preparation of a work plan addendum for installation of reiiiediation wells and perfornmance <br /> F Advanced GeeEnvironmental Inc <br /> h <br />