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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 PLANMACKGROUND REVIEWIPERMITTING Groundwater Technology prepared a Site-Specific Health and Safety Plan required by the Occupational Healt'i and Safety Administration IOSHA) SizIndard "Hazardous Waste Operations and Emergency Response" guidelines (29 GFR 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 sibcontractors performing work at the site. Groundwater Technology conducted a technical review of all pertir.,,nt information prior to proceeding with assessment work at the site. All opplicable permits pertainirq to soil boring installation were obtained. 3.2 SOIL BORING On November 22, 1991, Groundwater Technology drilled one soil borinq utilizinn a truck- mounted drill rig equipped with 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 geologic: under the supervision of a California registered geologl3t. The field geologist maintained a log of the materials encountered during drilling (Appandix B). The soil from the boring was placed on and covered with plastic sheeting and left on site. 3.3 SOIL SAMPLING During,,-thw',dnllinq ¢per qps, soilspmples were collected at- 5-foot intervals, beginning appcoxuriateIV'15-`feei*olow grade to the bottom of the.borin$: Samples were collected using a 2.5- inch outside diameter(O.D.)spiit-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 j samples were field screened using a photo-ionization detector (PID). One samNde from every five-foot .aterval was seated with aluminum foV capped, taped, labeled, placed on ice in an insulated container and delivered to a Sta'ce of California-certified laboratory. Eleven soil samples from the depth interval of 20 to 70 feet were selected for analysis. Each - sample was analyzed tok' benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum -= GROUNDWATER. ieasMws.itar Tcc"NOLocy.INC.