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r <br /> GEE <br /> GENESIS ENGINEERING 8 REDEVELOPMENT <br /> margin of the trough are derived from the metamorphic and plutonic rock terraines of the <br /> Sierra Nevada Mountains. The rivers and streams draining the Sierra Nevada are the <br /> conveyance mechanisms of clastic sediments that formed a belt of coalescing alluvial fans <br /> between the trough of the valley and the foothills of the Sierras. <br /> Lodi is situated on the distal end of the alluvial fan built by the Mokelumne River and the <br /> eastern margin of San Joaquin-Sacramento River delta. The sediments of the area are fluvial <br /> in origin and,by virtue of their geographic position within the fluvial system, are fine grained <br /> consisting of fine sand, silts and clay. The sediments are rich in quartz and tend to be <br /> micaceous. The dip of the beds is westward at a low angle. Shallow ground water surface <br /> has an elevation of about sea level and the flow of the ground water is westward. <br /> 2.0 SITE INVESTIGATION <br /> The following work tasks will be conducted during the Site Characterization activities. <br /> Task 1 — Advance a reconnaissance lithology boring at the location shown on Figure 4 to a <br /> depth of approximately 60 feet below ground surface ("bgs")to characterize soil <br /> lithology and to identify the shallow water bearing unit interval and the next <br /> deeper water bearing unit interval; <br /> Task 2 — Advance 17 reconnaissance borings into the shallow groundwater bearing unit at <br /> the locations shown on Figure 4 and collect groundwater samples from these <br /> borings; <br /> Task 3 — Collect water samples from all on-site water supply wells; <br /> Task 4 — Collect surface water and sediment samples from surface water discharge points <br /> and from the respective receiving bodies of water; <br /> Task 5 — Develop a Site Investigation Report to summarize the findings from the Site <br /> Characterization activities. <br /> These Tasks are discussed in detail in the following sections. Details on the reconnaissance <br /> boring and sampling methods are discussed in Section 3. <br /> 2.1 Task 1 —Lithology Soil Boring <br /> A soil boring will be advanced near the waste treatment pond(Figure 4)to a depth of <br /> approximately 60 feet bgs to record soil lithology and identify the shallow water bearing <br /> Lima Ranch 2 of 17 <br /> Site Characterization Work Plan Addendum <br /> April 2008 <br />