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r11 December 2000 <br /> AGE-NC Project No 97-0312 <br /> Page 4 of 4 <br />' The ground water gradient was 0 005 ft/ft across the site <br /> • TPH-g, TPH-d, and benzene were detected in the water samples collected from UST-1 and <br /> UST-5,TPH-d was detected in UST-2 and UST-3 samples Hydrocarbons were not detected <br />' in the water samples collected from UST-4 and UST-6 <br /> • MTBE was detected in the samples collected from UST-2 and UST-6 at concentrations of <br />' 2 6 µg/1 and 1 1 µg/1, respectively <br /> 0 1,2-DCA was detected in the samples collected from UST-5 and UST-6 at concentrations of <br />' 910 µg/1 and 2 1 µg/l, respectively, exceeding the State of California dnnking water <br /> maximum contaminant level (MCL) of 0 5 µg/1 <br /> • 1,1-DCA and PCE was detected in the sample collected from the small domestic well at <br />'1 concentrations of 13 µg/1 and 6 4µg/1,respectively,exceeding the MCL of 5 0 µg/1 for PCE <br /> 1 <br />' 5.0. RECOMMENDATIONS <br /> Based upon data obtained from the site, AGE recommends <br /> a Collection of a confirmation water sample from the small domestic well to verify the PCE <br />' concentrations detected If the conformation sample indicates the detection ofPCE,the small <br /> domestic well should be turned off to allow only the large well to supply the property with <br />' water, and <br /> • An oxygen releasing compound (ORC) should be considered for injection into UST-5 and <br /> utilized as a catalyst for bioremediation of UST-5 <br /> 1 <br /> 6.0. LIMITATIONS <br /> 1 1 <br /> Our professional services were performed using that degree of care and skill ordinarily exercised 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 /> geologic/hydrogeologic 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)and subsurface conditions may <br /> vary away from these data points No other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report <br /> 1 <br /> Advanced CeoEnvironmental,Inc <br />