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Chevron U.S.A., Inc. December 20, 1991 02320 1883 Page 2 3.0 ADDITIONAL ASSESSMENT WORK 3.1 SITE-SPECIFIC HEALTH AND SAFETY PLANIBACKGROUND REVIEW/PERMITTING Gro.ndwater Technology prepared a Site-Specific Health and Safety Plan required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" g.iidelines (29 CFR 1910.120). The Site-Specific Health and Safety Plan was prepared by a Groundwater Technology industrial hygienist, following a complete review of site conditions and any existing Site-Specific Health and Safety Plans for the site with the project manager. The document was reviewed and signed by all Groundwater Technology personnel and subcontractors personnel and subcontractoes performing work at the site. Groundwater Technology conducted a technical review of all pertinent information prior to proceeding with assessment work at the site. All applicable permits pertaining to soil bming installation were obtained. 3.2 SOIL BORING On November 22, 1991, Groundwater Technology drilled one soil boring utilizing a truck- mounted drill rig equipped wun 6.5-inch hollow-stem augers. The soil boring was drilled to a depth of 70-feet below grade. The sampling equipment was properly cleaned between sampling runs. The drilling operation was performed by a field geologist under the supervision of a California registered geologist. The field geologist maintained a log of the materials encountered during drilling (Appendix 9). The soil from the boring was placed on and covered with plastic sheeting and left on site. 3.3 SOIL SAMPLING During,." drilling operations, s?'l samples ware collected at 5-foot intervals, beginning approximately 15 feet below grade to the l,,ottom of the boring. Samples were collected using a 2.5- inch outside diameter 10.D,)split-spoon sampler, lined with three 2-inch diameter by 6-inch long brass sample tubes. The sampler was driven 18 inches ahead of the augers at each sample point. Soil samples were field screened using a photo-ionization detector(PID). One sample from every five-foot interval was sealed with aluminum foil, capped, taped, labeled, placed on ice in an insulated container and delivered to a State of California-certified laboratory. Eleven soil samples from the depth interval of 20 to 70 feet were selected for analysis. Each sample was analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX), and total (petroleum GROUNDWATER . TFcHNOLOGY,INC.