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11. S Can Conimmy 35275 Hwy. 33, Vernalis, Califoriji'z January .3, 1996 Preliminary Site Charaelerization 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 portions of the fans occasionally prograded over the axial area of the trough in response to major climatic ch=anges in the Sierras, This has resulted in a predominance of fine grained silts and clays in the subsurface of the area. 5.0 Hydrology California and Federal Governments have mandated that virtually all groundwater is beneficial for current or inure use unless it can be demonstrated that no beneficial use is known. This aquifer is considered to bP of beneficial use and as a r- cult, 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 idem-LEed in thL subsu a.-.e imn3ediM—Iy aidi scent to the main manufacturing building. The removed waste pit contents also. had detections oC contanvnation. It is suspected that - groundwater has been impact .d at this site. 7.0 Recommendations WHF, Inc., recommends that a continued study to be done in order to investigate the lateral and vertical extent of the soil plume and the possibility for first encountered groundwater inypact. It is recoui neded that five (5) soil borings, with appropriate sar11phng, be conducted to an approximate depth of 30-40 feet. One of the five boririgs shOuld be complzted as a 4" cased monitoring well to approximately 50 feet 1).g.l. Tile approximate location tb.-these should b3 as full(;ws. 1) Two {2)vertical borif;vis, approximately ten feet away froni the concrete support pillars in the direction parallel to the building(--north and south perimeter). 2) Two (2) angled boy cgs; appresxiriatel-y 25 degrees fi-om vertical, directly adjacent to the concrete support pilla3-s. Thusc boriiigs will be angled at 25 degrees, from vertical, under the foundation of the building.