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�' v"' A���'A y., i. �,4 .... `• 'r}�, �" :� u,h.,. �Y'..f � y� �,.- �''�. t � � t' P. +.� � ... <br /> 1w �� ,F.a, s � grpi�4. •'Amir. 6 �',n zip � , ,i Vii' ro.�A rk� � <br /> x <br /> Evidence of petroleum product was present in auger-return material <br /> encountered during the installation of E-9. Product odor was evident <br /> prior to encountering first ground water in wells E-1 through E-6. All <br /> the wells were sampled for floating product. Seven wells (E-2, E-3, <br /> E-4, E-5, E-6, E-9, and E-11) had measurable amounts of floating product <br /> ranging in thickness from .16 to over 3 feet before the recovery system <br /> was activated in early August 1984 (Table 1). <br /> REMEDIAL ACTION <br /> Based on the site investigation described above, EMCON Associates <br /> installed a recovery well at the location shown in figure 2 on July 24, <br /> 1984. The well was drilled to 42 feet encountering the water-bearing <br /> zone at 13 feet (see Appendix A). The bottom 2 feet were sealed with <br /> natural clay and 40 feet of 12-inch-diameter PVC casing was installed. <br /> The casing was slotted in the 35- to 9-foot interval (see Appendix A). <br /> f, <br /> A Petropurge System manufactured by Nepco® was installed in the well to <br /> extract gasoline floating on the ground-water table underlying the site <br /> �. and near vicinity. The Petropurge System consists of two separate sub- <br /> mersible pumps (a hydropurge and a petropurge) and two liquid level <br /> sensors. The hydropurge pump is set near the bottom of the well and is <br /> ' used to lower the elevation of the ground-water level in the extraction <br /> well. 8y lowering the water level in the extraction well a cone of <br /> depression is created in the water table around the well. The cone of <br /> depression created by the hydropurge pump causes the following <br /> effects: (1) it causes the immftscible liquids floating on the water <br /> table to flow towards the recovery well and be captured, and (2) it <br /> prevents the gasoline caught within the radius of influence of the well <br /> from migrating away from the recovery site. <br /> A Petropurge explosion proof submersible pump was installed in t:ie well <br /> for the purpose of removing the floating petroleum product that enters <br /> the wellk as a result of the cone of depression. The petropurge pump <br /> PJD 438-22.04 6 <br /> fmcon Associates <br />