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F <br /> January 17, 2006 Page 10 <br /> RNC PROJECT NUMBER 41204B <br /> Fbeen deposited almost continuously since the Jurassic (about 160 million years ago). Great <br /> oil fields have been found in southernmost San Joaquin Valley and along anticlinal uplifts <br /> k on its southwestern margin. In the Sacramento Valley, the Sutter Buttes, the remnants of <br /> r + an isolated Pliocene volcano, rise above the valley floor. <br /> M <br /> E 4.3 Soils <br /> t <br /> I <br /> The soils covering the subject property are varied,but typical of those associated with the <br /> Mehrten Formation. The Mehrten Formation is a complex unit of volcanically derived <br /> sediments mixed with cemented andesitic mudflows. Intermixed with the cemented <br /> mudflows are intervals of"black sands", stream gravels, silt, and clay, interbedded with <br /> intervals of dense tuff breccia. While sand and gravel intervals are highly permeable and <br /> productive, tuff breccia intervals act as confining layers. The thickness of this unit varies <br /> 1 between 200 and 1,200 feet. <br /> 4.4 Groundwater <br /> r The groundwater setting in the area of the subject property is complex and unpredictable <br /> due to the geologic setting. As stated in Section 4.3, the Mehrten Formation is cut with <br /> randomly spaced confining layers that will create perched water tables. At best, shallow <br /> groundwater flow can be predicted to be topographically controlled. Discussions with the <br /> current property owner about the new well indicated that the production zone is 300' or <br /> f more below the ground surface at the well location. <br /> There is no definitive information available upon which to draw a conclusion as to <br /> groundwater flow ow direction beneath the subject property. <br /> 5.0 USER PROVIDED INFORMATION <br /> 3 <br /> A User Questionnaire was submitted by RNC Environmental to Gary McEnerney', <br /> Fi requesting certain information about the users knowledge of the property. The <br /> F <br /> S By email dated December 14,2005 <br /> RNC Environmental,LLC • 9746 Parktree Way, Elk Grove,CA 95624 • 97.6.714.3073 • fax 916.290.0106 <br /> Colnmitsnerat to Service-Pride in Excellence <br />