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Dividend Development Company July 22, lggl <br /> Report of Findings -- North Parcel Page g <br /> FIELD SOIL SAMPLING: <br /> A. Field soil sampling was performed -during drilling. Continuous <br /> five foot (5 1 ) soil sections were cored from each we'll and <br /> analyzed far organic vapors using a Century 128 Model Organic <br /> Vapor Analyzer, parts per million accuracy. The same vapor <br /> analyzing procedure was used for the split spoon samples <br /> obtained from the lower part of MW-5 . <br /> B. Soil samples were collected from the cores at five foot (5 ' ) <br /> intervals, beginning at five to seven feet (51 to 71 ) depth <br /> for laboratory analyses. Analyses were performed according to <br /> EPA Test Methods 8015M and 8020. <br /> WELL DEVELOPMENT AND GROUMWATER SAMPLING: <br /> Well. Development <br /> The newly installed monitoring wells were developed in early June, <br /> 1991, by bailing and swabbing in order to reduce the sediment ti <br /> content in the well water. <br /> I� <br /> The well development process sets and grades the sand pack so that <br /> I <br /> silty and very fine grained sand are prevented from entering the <br /> well screen. In a properly set sand pack (filter pack) sand grains <br /> larger than the screen slots rest adjacent to the screen. The sand <br /> pack grain sizes decrease outward to the native formational <br /> materials. . <br /> The sand pack was effectively graded by swabbing the well. In <br /> swabbing, plunger-like a p g apparatus is run up and down the screened <br /> section of the well. This motion alternately pushes water in and <br /> out through the sand pack and well screen. Sediment which enters <br /> the well during swabbing is removed from the well with a bailer. <br /> Toxic Technology, Inc. <br /> I <br />