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ATTACHMENT B FIELD AND LABORATORY PROCEDURES Chevron 9-8632, 575 Grant Line Road, Tracy, CA 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 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 The borings were drilled using an 8-inch hollow-stem auger drilling equipment to approximately 20 feet bgs for the shallow soil borings, and to approximately 50 feet bgs in the deep soil borings The borings were logged by a SECOR representative using the Unified Soil Classification System and standard geologic techniques Soil samples for logging were collected at 5-foot depth intervals using a California-modified split-spoon sampler The sampler was 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 cham-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 an alconox or equivalent solution between samples Organic Vapor Procedures Soil samples collected at 5-foot depth intervals during drilling were analyzed in the field for ionizable organic compounds using a photo-ionization detector (PID) with a 10 2 eV lamp The test procedure involved measuring approximately 30 grams from an undisturbed soil sample, placing this subsample in a sealed container (either a zip-lock bag or a mason jar) The container was warmed for approximately 20 minutes (in the sun), then the head-space within was tested for total organic vapor, measured in parts per million as benzene (ppm, volume/volume) The instrument was calibrated prior to drilling using a 100-ppm isobutylene standard (in air) and a sensitivity factor of 55, which relates the photo-ionization potential of benzene to that of isobutylene at 100 ppm The results of the field testing were noted on the boring logs PID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confidence of laboratory analyses Groundwater Monitoring Well Installation The borings were converted to a groundwater monitoring well by installing 2-inch diameter, flush-threaded, Schedule 40 PVC casing with 0 020-inch factory-slotted screen Approxi-