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Lodi Unified School District � 820 S. Cluff Avenue, Lodi, California June 1, 1994 Environmental Assessment Work Plan Page; 2 3.1 Drilling Permits will be obtained, as necessary, for the borings before drilling begins. The soil borings will be accomplished using a mobile mounted drilling rig employing a hollow stem flight auger no less than 3 1/4-inch i.d. and 8 7/8 o.d. All drilling equipment will be thoroughly steam cleaned before drilling begins to prevent the introduction of contamination from off site and to prevent cross contamination. The boring will be logged (Figure 3) under the direct supervision of a registered geologist using the Unified Soil Classification System. The color, texture, moisture, plasticity (if applicable), consistency of the earth materials, blow counts, pertinent soil or bedrock characteristics and any evidence of contamination will be noted. All water-bearing zones, and the depths at which they were encountered, will be noted on this log. The boring will be drilled in such a manner as to prevent cross contamination between strata. Exploratory soil borings within the unsaturated zone will be backfilled with a concrete slurry mixture. The cuttings from the drilling operation will be containerized on site during drilling for proper disposition. The proper method of disposal will depend upon results of laboratory analysis. This disposal will be the responsibility of the client unless other arrangements have been made. 3.2 Soil Sampling All soil sampling equipment will be thorouglly steam cleaned before and between sampling to prevent cross contamination. Relatively undisturbed soil samples will be taken at intervals of not more than five feet (5') in order to evaluate the subsurface materials; however, this sampling interval may be waived in saturated sands in which sample recovery is not possible. The soil samples will be taken using a California Modified Split Spoon sampler with brass liners. The sampler will be driven continuously by a wire-line hammer .J (brass tube sampler with slide hammer for hand augered samples).