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5 \/ ./ hammer. The driven liner and SPT samplers also were used in deeper sand layers. Most clay layers were sampled with a 3.0-in.-O.D. , thin-walled Shelby tube. The Shelby tubes were pushed by the drill rig's hydraulic ram. Some samples of clay soils also were recovered with the driven, liner sampler. Each sample was removed or extruded from the sampler in the field, examined, and visually classified by our field geologist. Torvane and pocket penetrometer strength tests were conducted in the field on samples of clayey soils. Represen- tative portions of each sample were sealed and packaged for transport to our testing laboratory. Groundwater was encountered in the borings at about 7 to 11-ft depth. Because the borings were drilled to penetrations extending below ground- water, the borings were permitted, as required by local regulations, with the San Joaquin Local Health District. At the end of each day, that day's boreholes were backfilled by filling the borehole from bottom to the ground surface with a pumped Volclay grout. The grouting operation was witnessed by an inspector from the Local Health District. The descriptions of the materials encountered in the borings are presented on the boring logs, Plates 3 through 9. These boring logs are based on the field logs, visual inspection of the samples obtained, and laboratory test results. A description of most of the terms and symbols used on the boring logs is provided on Plate 10. Field Electrical Resistivity Survey Field electrical resistivity measurements were conducted in December 1988 at three locations (ER-1 through ER-3) as shown on Plate 2. Two locations (ER-1 and ER-2) were in the southern area of the site. A third location (ER-3) was in the northeastern area. The field electrical resistivity measurements were conducted with a Vibro- ground, Model 293 instrument in conjunction with a 4-pin, equal electrode spac- ing, Wenner configuration, in accordance with ASTM 57-78. Electrode spacings ranged from 3 to 12 feet with an equal spacing increment of 3 feet. Testing was done over relatively flat ground, except where the ground surface was hummocky. Ground undulations rarely exceeded 1 foot but occasionally were larger than 2 feet. In addition to the three surface measurements, one measurement was made for comparison, across a glass pile, to the south of the "plant" area. The glass 1144A/CC-5 p McClelland