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U. S Can Company 35273 Hivy. 33, Vernalis, California January 3, 1996 Prelinzinary Site Characterization Report of Findings Page: 4 axial portions of the trough, in the toe areas of the fans, throughout much of this time period. Coarser grained sediments of the upper potions of the fans occasionally prograded over the axial area of the trough in response to major climatic changes in the Sierras. This has resulted in a predominance of fine grained silts and clays in the subsurface of the area. 5.0 Hydrolo," California and Federal Governments have mandated that virtually all groundwater is beneficial for current or future use unless it can be demonstrated that no beneficial use is known. _ This aquifer is considered to be of beneficial use and as a result, must be protected from contamination. Those identified uses include agriculture and industrial, as well as potential use for animal or human consumption. 6.0 Conclusions Soil contamination was ideatified in fhe subsuface immediately .adjacent to the main manufacturing building. The removed waste pit contents also had.detections of contamination. It is suspected that groundwater has been impacted at flus site. 7.0 Recominendations VWHF, Inc., recommends that a continued study to be. doze tin order w investigate the lateral and vertical extent of the soil plume and the possibility for first encountered groundwater irnpact. It is recommeded that five (5) soil borings, with appropriate sampling, be conducted to an approximate depth of 3040 feet. One of the five borings should be completed as a 4" cased monitoring well to approximately 50 feet b.g.l. The approximate location for these borings should be as follows: 1) Two (2)vertical boringis, approximately tent feet away from the concrete support pillars in the direction parallel to the building(—north and south perimeter). 2) Two(2) angled borings, approximately 25 degrees from vertical, directly adjacent to the concrete support pillars. Tlkese borings will be angled at 25 degrees,from vertical, under the foundation of the building.