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1.40, -.do, Lodi Unified School District 820 S. Cluff Avenue,Lodi, California August 1, 1994 Environmental Assessment Report page. 2 3.1 Drilling Permits were obtained for the borings before drilling began. The soil borings were 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. .y All drilling equipment was thoroughly steam cleaned before drilling began to prevent the introduction of contamination from off site and to prevent cross contamination. The boring was logged by a geologist (Appendix B)under the direct supervision of a registered professional using the Unified Soil Classification System. The color, texture, moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil or bedrock characteristics and any evidence of contamination was noted. The boring was drilled in such a manner as to prevent cross contamination between strata. The cuttings from the drilling operation were containerized on site during drilling for proper disposition. The proper method of disposal is dependent upon results of laboratory analysis. This disposal is the responsibility of the client. 3.2 Soil Sampling All soil sampling equipment was thoroughly cleaned before and between sampling to prevent cross contamination. Relatively undisturbed soil samples were taken at intervals of not more than five feet (5') in order to evaluate the subsurface materials. The soil samples were taken using a California Modified Split Spoon sampler with brass liners. The laboratory samples were immediately sealed in their liners using aluminum foil lined plastic caps. The remaining samples were removed from the liner and used as an aide to the on-site geologist in logging the material at that depth. Soil samples for laboratory analysis were properly labeled with date collected, project number, sample coordinator, and sample identification. The samples were refrigerated immediately for delivery to the laboratory and were not opened by anyone other than laboratory personnel. Chain of Custody records were maintained at all times (Appendix A). Soil samples collected for laboratory analysis were analyzed for hydraulic oil by the California State Certified Laboratory of GeoAnalytical, Inc.