ARCHIVED REPORTS_XR0005557 - Laserfiche WebLink

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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 prepared a Site-Specific Health and Safety Plan for use during fieldwork The field staff and contractors reviewed the Site-Specific Health and Safety Plan before beginning field operations at the site Exploratory Drilling The soil bonngs were advanced using 8-inch hollow-stem auger drilling equipment to approximately 85 feet bgs A SECOR representative using the Unified Soil Classification System (USCS) and standard geologic techniques logged five foot soil samples from the bonngs Soil samples were collected at five foot intervals using a California-modified split- spoon sampler Soil samples for chemical analysis were collected in five foot intervals below 60 feet bgs and retained in brass liners, capped with Teflon squares and plastic end caps, and sealed in 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 each soil boring Down hole sampling equipment was washed in a tn-sodium phosphate or alconox solution between samples Groundwater Monitoring Well Installation 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 Approxi- mately 15 feet of screen was placed in the bottom of each boring A grade of sand appropriate to the screen size was placed in the annular space across the entire screened interval, and extends approximately 2 feet above the top of the screen for each well A bentonite seal extends two feet above the sand pack The monitoring wells were completed with neat cement from the bentonite seal to ground surface The well casings were topped with a locking cap, and the well heads contained in watertight traffic rated, flush mounted well boxes The boring logs show well construction details Laboratory Procedures for Soil and Groundwater Samples Soil and groundwater samples collected were analyzed for the presence of total petroleum hydrocarbons quantified as gasoline (TPHg), by Northern California Leaking Underground Fuel Tank (LUFT) method, methanol and ethanol by EPA Method 8015B (modified), benzene, toluene, ethylbenzene, and xylenes (BTEX) and the fuel oxygenates methyl tertiary butyl ether (MtBE), by EPA Method 8260B