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/ f Larkspur Estates Soil Sampling The soil samples were taken using a GeoproW core sampler with plastic liners. The sampler was pushed (Direct Push Technology) continuously by the hydraulically powered, percussion system. The laboratory samples did not have headspace and were immediately sealed in their liners using plastic caps. All soil samples were delivered, under chain of custody, to an analytical laboratory licensed by the State of California for hazardous materials work. The samples were analyzed for Total Extractable Petroleum Hydrocarbons by 5030 and 3550 Luft, BTX&E (Benzene, Toluene, Xylene, and Ethyl Benzene) and Oil & Grease. Analyses were conducted by GeoAnalytical Laboratories, Inc., in Modesto, California. All rinse water was removed by the driller, V&W Drilling, Inc. Drill cuttings are not produced by this method. 4.0 CONCLUSIONS AND RECOMMENDATIONS The Larkspur Estate development is located on the edge of a former gravel pit (Figure 1). An abandoned oil pipeline is reported to run along the Southern Pacific Railroad spur, cross over the southwest corner of the Larkspur property then terminate in the gravel pit. This line was discovered during the installation of a sewage trunk near lot 108 (Figure 2). Personnel from the Oil Company responsible for the pipeline, made repairs and indicated to the housing development representative that the line dumped into the former gravel pit commonly referred to a s the Tracy Oil Pit. Soil samples obtained near the property line between the Larkspur development and the gravel pit did not disclose oil compounds in the laboratory analyses. However, groundwater was not encountered and sampled. M.J. Kloberdanz & Associates recommends contacting the owner of the pipeline and requesting additional information as to its exact location purpose. Historical aerial photographs could be reviewed and the appropriate State agency contacted for additional information. Future drilling, if requested, may require the use of"rotary-air" equipment in order to penetrate the rock. The borings were not logged for this property transaction assessment. No geological interpretation is included in this report. Any reference to soil types is made as an observation in common terms and is intended as an explanation for limitations of the boring equipment. The above represents our best professional opinion as to environmental conditions at this site. These opinions were derived using data at hand, and standards of care common to the environmental consulting community in Northern California. There is the possibility that even with proper application of the above methodologies, there may exist on the subject property conditions that could not be identified within the scope of this 3