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June 30, 1995 <br /> Page 4 <br /> 3. Piping at the site may not have been replaced. <br /> Two generations of product piping have been used at the site. The <br /> first generation of piping was associated with the original station <br /> product facilities which were removed in 1986. Data available to date <br /> regarding the piping are from the station remodeling bid specifications <br /> and the current product piping and dispenser configurations. <br /> The bid specification details the removal of the piping as a task to be <br /> performed during station remodeling. The current product piping and <br /> dispenser configurations cross the former piping. The installation of <br /> the,current piping would require the removal of the former piping. <br /> Three soil borings are proposed, to confirm that the former piping has <br /> been removed and to evaluate the soil conditions beneath the former <br /> piping. The location of these borings are shown on Figure 4 of the <br /> CAP revision. <br /> 2.2 Primary Source <br /> I. Piping may be a primary source; soil samples were not collected <br /> beneath the piping. Soil contamination within the 1986 tank removal <br /> does not correlate with groundwater contamination. <br /> It has been presumed that the primary source of hydrocarbon impact at <br /> the site is from the former product facilities and/or product piping. <br /> However, soil data collected to date does not unequivocally suggest an <br /> on-site source. Considering the proximity of the site to other potential <br /> hydrocarbon sources, it seams likely that the primary source of <br /> hydrocarbons detected beneath the site were generated from on-site <br /> activities. <br /> It should be noted, however, that the relatively small, low concentra- <br /> tion dissolved hydrocarbon plume that underlies the site is situated <br /> xvithin a larger higher concentration chlorinated plume. Further, the <br /> chlorinated compounds overlap into the hydrocarbon range of <br /> detection. Therefore, the reported hydrocarbon concentrations may <br /> actually contain chlorinated contributions. <br /> Based on extensive subsurface investigation that has been performed at <br /> the site to date, the quantity of any release that occurred at the site <br /> 3:0 I3570CAPLET.DOC.doc <br />