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•] M ATTACHMENT B 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 S, 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 was reviewed by the field staff and contractors before beginning field operations at the site Exploratory Drilling and Soil Sampling The three on-site borings were drilled to a depth of approximately 40 feet bgs The deep on- site soil boring was drilled to a depth of approximately 90 feet bgs The off-site borings was dnlled to a depth of approximately 40 feet bgs The borings was drilled using 8-inch hollow- stem auger drilling equipment and logged by a SECOR representative using the Unified Sol] Classification System and standard geologic techniques under the direction of a Registered Geologist Soil samples for logging were collected at 5-foot depth intervals using a California-modified split-spoon sampler The sampler were driven a maximum of 18 inches using a 140-pound hammer with a 30-inch drop Soil samples for chemical analysis were retained in brass liners, capped with Teflon squares and plastic end caps, and sealed in clean zip-lock bags The samples were placed on ice for transport to the laboratory accompanied by chain-of-custody documentation Down-hole drilling and sampling equipment was steam- cleaned prior to and following the completion of the soil boring Down-hole sampling equipment was washed in a tn-sodium phosphate or alconox solution between samples Groundwater Monitoring Well Installation and Sampling The bonngs were converted to groundwater monitoring wells by installing 2-inch diameter, flush-threaded, Schedule 40 PVC casing with 0 020-inch factory-slotted screen The deep boring were drilled after conductor casing has been installed to seal the shallow aquifer Not more than 20 feet of screen were placed in the bottom of the deep on-site boring, and approximately 20 feet of screen were placed in the bottom of the other six borings A grade of sand appropriate to the screen size was placed in the annular space across the entire screened interval, and will extend approximately 2 feet above the top of the screen for the wells A bentonite seal will extend two feet above the sand pack The monitoring wells will be completed with neat cement from the bentonite seal to ground surface The well casings