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S E C O R 1 Health and Safety Prior to performing field work at the site, SECOR will prepare a Site-Specific Health and Safety Plan required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" iguidelines (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) The Site-Specific Health and Safety Plan will be reviewed by field staff and contractors before beginning field operations at the site Exploratory Drilling and Sampling The soil borings will be drilled to a depth of approximately 75 feet below ground surface (bgs) The borings will be drilled using 8-inch hollow-stem auger drilling equipment and logged by a SECOR representative using the Unified Soil Classifica- tion System and standard geologic techniques under the direction of a registered geologist Soil samples for logging will be collected at 5-foot depth intervals using a lie 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 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 Grab groundwater samples will be collected using a disposable bailer Groundwater samples will be placed in 40 ' milliliter hydrochloric acid preserved VOAs Soil and groundwater samples will be placed on ice for transport to the laboratory accompanied by chain-of-custody docu- mentation Down-hole drilling and sampling equipment will be steam-cleaned prior ' to and following the completion of the soil boring Down-hole sampling equipment will be washed in a tri-sodium phosphate or alconox solution between samples ' The borings will be backfilled with neat cement and finished to grade with concrete ' Groundwater Monitoring Well Installation The borings were converted to groundwater monitoring wells by installing 2-inch ' diameter, flush-threaded, Schedule 40 PVC casing with 0 020-inch factory-slotted screen Approximately 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 2 feet above the sand pack The monitoring wells were completed with neat cement from the bentonite seal to