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POMBO PROPERTY Phase I Historical Environmental Audit Page: 2 A portion of the property at 24100 S. Lammers Road is occupied by a farming facility, which includes residential dwellings, a barn, equipment sheds and shops. Tractor storage, repairs, and fueling are conducted in this area which fronts I Vh Street. Some pesticide storage was apparent during inspection. Records indicate that improvements to the parcel started in 1930. The remaining acreage is used for irrigated crops and/or pasture and historically has been used for tree crops. A residence constructed in the early 1960's is located on a small portion of the acreage referred to as 24832 S. Lammers Road. The balance of this property is used for irrigated crops. No record of improvements prior to the current structure was evident in the researched materials. 3.1 Site Location Maps have been provided in order to give a picture of the location of the subject property. Maps included are a vicinity map (Figure 1), parcel maps (Appendix A), and a record search index map (Appendix B). 3.2 Description of the Area The subject property is located near the north east corner of Lammers Road and 11th Street west of Tracy. A West Side Irrigation District canal runs through a portion of the property. Other cattle ranch and farmland surround the three parcels. 3.3 Geology & Hydrology The Central San Joaquin Valley is floored by unconsolidated quaternary sediments to depths of 400 feet or more. All of these units can be considered soils in the engineering sense, as they are unconsolidated. The sediments of the Central Valley were deposited as a series of coalescing alluvial fans. The fans originated where valleys of major streams that drained the Sierras, emptied into the broad expanses of the Central Valley. The coarser sediments, which comprise the fans, are mainly arkosic in composition. They were derived from erosion associated with glacial stages in the mountains. The finer grained sediments are predominantly composed of rock flour washed out of the former extensive glaciers in the Sierras (Arkley, 1964). There are layers of clay and layers of hardpan throughout the Tracy area. These layers are not considered discontinuous, and communication between "perched" water, shallow aquifers and deeper aquifers are believed to occur in the Central Valley.