Laserfiche WebLink
Project No 58080-06-03 <br /> January 19, 1996 <br /> ' Page 4 <br /> DISCUSSION <br /> With the exception of TPHg and BTEX concentration increases in MW-4, the distribution <br /> ' of petroleum hydrocarbons beneath the Bokides and Togo's site appears reasonably <br /> consistent with data obtained from the previous September 1995 sampling event <br /> ' The distribution of TPHg and MTBE beneath and upgradient (north) of the site continues <br /> to suggest an upgradient offsite source for the groundwater impacts beneath the Togo's site <br /> This is evidenced by the fact that three of the four wells with detectable MTBE (wells <br /> ' BMW-1, BMW-2 and MW-5) are located upgradient from the Togo's site in the immediate <br /> vicinity of operating USTs <br /> The presence of TPHg, BTEX and MTBE in equipment blank sample EB-1 does not appear <br /> to have had any influence on the representativeness of the groundwater quality data <br /> ' Reasons for this include 1) the distribution of the petroleum hydrocarbon impacts are <br /> generally of similar magnitude compared to the previous sampling data, 2) the pump was <br /> used only to purge (not sample) the FDIC wells and 3) an in-line check valve located at the <br /> pump prevents groundwater from leaving the pump and entering the wells during the <br /> purging process <br /> i <br />