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KLEINFELDER i sample was trimmed and capped with hydrocal gypsum. These tests generally resulted in strengths in the range of 2,900 to 7,000 pounds per square foot (psf). Pictures documenting the excavation of samples at Teichert's Vernalis pit are presented on Plate 2. A table summarizing the results of these tests is presented on Plate 4. I Laboratory tests run as part of our previous investigations included Unconfined Compressive _ Strengths, Direct Shears, Tri-axial Shears, Grain-Size Analyses, and Moisture Density Determinations. _ Two bulk samples were previously obtained of the reclaimed soils from the nearby Teichert Vernalis plant. From each bulk sample,two approximate 6-inch high,4-inch diameter samples were compacted in our laboratory for unconfined compressive strength testing. The samples were compacted near the optimum soil moisture content to about 80 percent compaction in an ASTM D-1557 compaction mold. The intent of this low compactive effort was to simulate minimal wheel rolling by scrapers placing the fill. The measured unconfined compressive strengths of the four remolded samples ranged from 922 to 1,872 psf,with an average of 1,336 ` psf. Later,a representative of our firm obtained an additional bulk sample of similar soils. The sample was prepared for unconfined compressive strength testing as described above; however, the sample was compacted to approximately 90 percent relative compaction. The measured ` unconfined compressive strength of the sample was 6,048 psf. 4. SITE CONDITIONS _ Surface Conditions At the time of our investigation, the site consisted of an orchard that was bounded on the south by Blewett Road, on the west by the Delta Mendota Canal and a field, on the north by Ohm road, and on the east by Koster Road. PG&E's buried line 108 crosses the southern portion of the site. I Subsurface Conditions _ The subsurface soils encountered generally consisted of sandy clay to clayey sand to depths ranging from about 21/2 to 291/2 feet below the existing site grade, underlain by partially- cemented, gravelly soils with occasional cobbles and thin, partially cemented lenses of clay, silt, and sand to the maximum depths explored. The soils encountered in the current investigation generally contained a higher content of clay and silt than the soils encountered in our previous investigations in the project area. Otherwise, the soils encountered during this investigation are generally consistent with the soils encountered in our previous investigations. 29007.G01/ST03R1215 August 21,2003 O 2003 Kleinfelder,Inc. Page 2 of 5 Y. I be