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Mr . Scott Walker <br /> November 22 , 1988 <br /> 202/799-5027 . 02 <br /> Page 2 <br /> total petroleum hydrocarbons (TPH) as gasoline con- <br /> centrations of 3 , 200 and 100 parts per million (ppm) at <br /> depths of 10 and 45 feet , respectively. <br /> " Monitoring data from the groundwater monitoring wells <br /> revealed local estimated groundwater flow directions to <br /> the southeast under a relatively flat hydraulic <br /> gradient of less than one percent . <br /> " Groundwater samples collected from MW-1 , MW-2 , and MW-3 <br /> have revealed fluctuations in benzene and TPH as <br /> gasoline concentrations over the life of the project . <br /> Based upon a review of data accumulated during GTI ' s work at the <br /> site, the following interpretations were made : <br /> " Soil contamination appears to be confined to the area <br /> of the abandoned tank pit . <br /> " The fluctuations of benzene and TPH as gasoline <br /> concentrations in groundwater may be reflective of <br /> seasonal variations , and warrants the initiation of a <br /> monthly monitoring and quarterly sampling program at <br /> the site. <br /> " The lack of definition of the extent of hydrocarbons in <br /> groundwater warrants the drilling and installation of <br /> additional monitoring wells . <br /> WORK PLAN <br /> In order to provide a better definition of hydrocarbons in <br /> groundwater (as required by the CRWQCB-CVR) , GTI proposes to <br /> implement the following work steps : <br /> " Install additional groundwater monitoring wells to <br /> provide documentation for the hydrocarbon plume defi- <br /> nition through periodic groundwater sampling. <br /> " Implement a monthly groundwater monitoring and quar- <br /> terly groundwater sampling program at the site . <br /> " Prepare a soil remediation proposal ( SRP) for the site. <br /> " Prepare a Problem Assessment Report , which would <br /> include recommendations for a Final Remedial Plan <br /> (FRP) . <br />