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ATTACHMENT A FIELD AND LABORATORY PROCEDURES Health and Safety Prior to performing field work at the site, SECOR prepared a Site-Specific Health and Safety Plan 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). The Site-Specific Health and Safety Plan was reviewed by field staff and contractors before beginning field operations at the site. Exploratory Drilling and Sampling The soil borings were drilled to a depth of approximately 79 feet below ground surface (bgs). The borings was 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 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 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. Groundwater samples were collected at total depth of each boring using a disposable bailer deployed within the hollow-stem augers. Groundwater samples were placed in 40-milliliter hydrochloric acid preserved VOAs. Soil and groundwater 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 tri-sodium phosphate or alconox solution between samples. The borings were backfilled with neat cement and finished to grade with concrete. 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 or an organic vapor meter (OVM). The test procedure involved measuring approximately 30 grams from an undisturbed soil sample, and placing this sub-sample 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 cali-