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r .i ,.. u, w .. a -. .. .. y � '� - -` �` � .. t .. r -m v ..♦ `.. „'r a --s ct- <br /> 1 <br /> 10 March 2000 <br /> AGE-NC Project No 97-0312 <br /> Page 6 of 6 , <br /> between the September and December 1999 monitoring events The Inferred ground water <br />' flow direction continues to be northeasterly <br /> j <br /> • TPH-g, TPH-d,benzene and toluene were detected in the water sample collected from UST- a ; <br />' 5, TPH-d was detected In UST-4, toluene and xylenes were detected In UST-2 4 <br /> Hydrocarbons were not detected In the water samples collected from UST-3 or UST-6 <br />' 1,2-DCA was detected In UST-5 at a concentration of 510 ppb, exceeding the State of <br /> California drinking water maximum contaminant level (MCL) of 0 5 ppb <br />' The stockpiled soil disposed following removal of the USTs was estimated to contain <br /> approximately 23 gallons of gasoline and 174 gallons of diesel <br /> _ '• Fate and transport modeling was performed using data from the two most intensely Impacted <br /> areas of soil BTEX were not predicted to further Impact ground water at the former UST and <br /> pump Island locations <br /> 5.0. RECOMMENDATIONS <br /> Based upon data obtained from the site, AGE recommends the following <br />' • Consideration of the site for closure by the PHS-EHD <br /> G If concurrence for site closure appears likely, a Closure Summary Report should be prepared <br />' for the site <br /> • If site closure Is not likely to be granted, a reduced schedule for quarterly monitoring should <br /> be developed In conjunction with the PHS-EHD A meeting Involving the PHS-EHD, the <br />' CVRWQCB and Mr Cecchml should be held to determine future requirements to achieve <br /> site closure r <br /> 1 � _ <br /> 6.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exerclsed'by <br /> environmental consultants practicing In this or similar localities The findings were based mainly , <br />' upon analytical results provided by an. Independent laboratory Evaluation of the <br /> geologlc/hydrogeologlc conditions at the site for the purpose of this Investigation was made from <br /> a limited number of available data points (I e ground water samples, soil samples) and subsurface <br />' conditions may vary away from these data points No other warranty, expressed or implied, Is made <br /> as to the professional recommendations contained In this report <br /> Advanced GeoEnviron mental,Inc <br /> y <br />