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1 T <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. Sever, wells (E-2, E-3, <br /> E-4, E-5, E-6p 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 /> K was activated in early August 1984 (Table 1). <br /> REMEDIAL ACTION <br /> Based on the site investigation described above, FMCON 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•-dian.Eter PVC casing was installed. <br /> The casing was slotted in the 35- to 9-foot interval (see Appendix A). <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 /> marsible 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. By 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 /> effec.s: (1) it causes the immiscible liquids floating on the :later <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 submersi►, )amp was installed in the well <br /> for the purpose of removing the floating petroleum product that enters <br /> the: wells as a result of the cone of depression. The petropurge pump <br /> PJQ 438-22.04 6 <br /> - EmColl Assodatos_j <br />