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' SECTION TWO <br /> UNDERSTANDING OF SITE REQUIREMENTS <br /> On the basis of review of previous site investigation and sampling activities <br />' as well as several visits to the site, it appears that upwards of 250 cubic <br /> yards of soil which has been impacted by both gasoline and diesel fuel <br /> hydrocarbons has been excavated from the vicinity of former fuel storage <br /> ttanks and awaits remediation and/or disposal Additional soil may <br /> necessite removal from the currently open excavations The site layout <br /> and location of tank pits is shown in Drawing 2-1 <br /> 21 Sources of Hydrocarbon Impacts <br />' Sources of hydrocarbons which have the potential to impact soil and <br /> groundwater underlying the subject site are divided into on-site sources <br />' and off-site sources Both source groups have the potential to influence <br /> sampling and analysis results and therefore require recognition in the <br />' development of remediation activities <br /> On-site sources consist of former underground storage tanks which have <br /> been excavated recently and the storrnwater collection pond, both of <br /> which are identified on Drawing 2-1 In September 1992, two diesel <br /> underground storage tanks with capacities of 10,000 and 7,500 gallons and <br /> one gasoline underground storage tank with a capacity of 7,500 gallons <br /> were removed after leaks were detected Subsequent soil sampling within <br /> the excavation pits found elevated concentrations of petroleum <br />' hydrocarbons <br /> Separately from the underground storage tanks is the storrnwater <br /> collection pond Soil sampling conducted by EMCON Associates during <br />' 1988 in the vicinity of the pond and adjoining drainage ditch revealed <br /> elevated levels of hydrocarbons EMCON identified the source of the <br />' 2-1 <br />' COMPANY CONFIDENTIAL TRADE SECRET ANA PROPRIETARY 1NFORMATnO1 OP TEE MARK GROUP ��� <br />