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APPENDIX A FIELD AND LABORATORY PROCEDURES Health and Safety As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR will prepare a Site-Specific Health and Safety Plan prior to the commencement of fieldwork. The Site-Specific Health and Safety Plan will be reviewed by the field staff and contractors before beginning field operations at the site. Exploratory Drilling (Ozone Sparge Points) The soil borings will be drilled to depths of approximately 45 feet bgs. The borings will be drilled using 8-inch hollow-stem auger drilling equipment and logged by a SECOR representative using the Unified Soil Classification System and standard geologic techniques. Soil samples for logging will be collected at 5-foot depth intervals using a California- modified split-spoon sampler. The sampler will be driven a maximum of 18-inches using a 140-pound hammer with a 30-inch drop. All soil samples for chemical analysis will be retained in brass liners, capped with Teflon squares and plastic end caps, and sealed in clean zip-lock bags. The samples will be placed on ice for transport to the laboratory accompanied by chain-of-custody documentation. All down-hole drilling and sampling equipment will be steam-cleaned following the completion of the soil boring. Down-hole sampling equipment will be washed in a tri-sodium phosphate or alconox solution between samples. Ozone Sparge Point Installation The borings will be converted to dual completion ozone sparge points by installing two (2) 2- inch diameter sparge points with a 3/4-inch PVC riser extending to the surface. The sparge points will be approximately 2-1/2 feet in length. A grade of sand appropriate to the screen size will be placed in the annular space of the lower sparge point, across the entire screened interval, and will extend approximately 2 feet above the top of the screen for the sparge point. A bentonite seal will extend two feet above the sand pack. Neat cement will extend from the bentonite seal to the bottom of the upper sparge point. A grade of sand appropriate to the screen size will be placed in the annular space of the upper sparge point, across the entire screened interval, and will extend approximately 2 feet above the top of the screen for the sparge point. A bentonite seal will extend two feet above the sand pack. Neat cement will extend from the bentonite seal to ground surface. The well casing will be topped with a locking cap. The boring log will show well construction details. The well will be developed after completion. I:\Chevron\90557\REPORTS\Feasibility Study\03_Addendum.doc