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Escalon Subdivision <br /> Page 3 <br /> May 30,2000 <br /> III FIELD EXPLORATION AND LABORATORY TESTING <br /> The field investigation consisted of excavating seven (7) exploratory test holes carried to <br /> depths of 10 to 15 feet. A second boring was drilled next to the exploratory boring to perform <br /> percolation test required by San Joaquin County Environmental Health Division further described <br /> in a soil suitability report conducted by Anderson &Assoc.' Test holes were drilled with a truck <br /> mounted Deep Rock drill rig, utilizing 4.5 inch continuous flight auger. The location of the test <br /> ` holes is shown on the location map, Plate No. 1. The location of the test holes was determined by <br /> pacing; hence, accuracy can be implied only to the degree that this method warrants. <br /> r <br /> Sampling of seven (7) test holes (B-1 through B-7) was performed at various depths by a <br /> California Modified 2.5-inch o.d. split spoon sampler with stainless steel tube liners. The sampler <br /> was driven by a 140-pound hammer with a 30-inch drop. Blow counts required to drive the sampler <br /> every 6 inches for a total depth of 18 inches were recorded and a summary of the blow counts <br /> required to drive the sampler the last 12 inches is presented on the Log of Boring sheets, Plates No. <br /> r 2 through 6. Sampling and logging of B-3 was performed by collecting and examining grab samples <br /> off the auger. This boring was completed into a temporary 10-foot deep percolation test hole. <br /> Relatively undisturbed soil samples obtained from the test holes were preserved until the <br /> samples could be tested in the laboratory. Samples were taken to the laboratory of Neil O.Anderson <br /> & Associates, Inc., Lodi, California and used for performing various laboratory tests. Tests <br /> performed consisted of unit weights and moisture contents of soil samples. A summary of the test <br /> results is presented on the Log of Boring sheets. <br /> Two bulk samples of the subgrade soil were obtained for performing R-value tests(see Plate <br /> I for approximate locations). The samples were obtained from the 12 to 18 inch depth. The results <br /> ` of the R-value tests indicate values of 38 and 42 for the subgrade soil consisting ofbrown silty sand. <br /> 6. IV SOIL CONDITIONS <br /> Visual classification according to ASTM D2488 (Visual - Manual Procedure) of each soil <br /> stratum encountered was made in the field by an engineer at the time the test holes were drilled. The <br /> samples obtained were checked in the laboratory and classification verified according to ASTM <br /> D2487. A classification and graphical representation of each soil encountered is presented on the <br /> Log of Boring sheets. The test boring legend is presented on Plate No. 9. <br /> s Neil O.Anderson&Associates,2000,Soil Suitability Study, 70-Acre Major Subdivision,Magnolia and <br /> Campbell Avenue,Escalon,California. Unpublished consultant report dated May 30,2000. <br /> P pEggOy <br /> A <br /> r OaN <br /> v <br />