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ATTACHMENT A FIELD AND LABORATORY PROCEDURES Soil Sampling During Excavation Activities Soil samples were collected by advancing 2-inch-diameter brass sample liners into undisturbed soil, or soil removed from an excavation by a backhoe bucket Soil samples for chemical analysis were retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps The samples were then sealed in zip-lock bags, placed on ice, and transported to the laboratory accompanied by the appropriate chain-of-custody documentation Stockpiled Soil Sampling During Excavation Activities . Soil samples were collected by advancing 2-inch diameter brass sample liners into the soil stockpile after removing approximately six inches of surface soil One composite sample was collected per approximately 200 cubic yards of soil Soil samples for chemical analysis were retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps The samples were then sealed in zip-lock bags, placed on ice, and transported to the laboratory accompanied by the appropnate chain-of-custody documentation Organic Vapor Analysis of Excavation Samples Selected soil samples were analyzed in the field for ionizable organic compounds using a photo-ionization detector (PID) The test procedure involves measuring approximately 30 grams from an undisturbed soil sample, placing this sub-sample in a zip-lock plastic bag The bag is warmed for approximately 20 minutes, then the head-space within the bag is tested for total organic vapor, measured in parts per million as benzene (volume/volume) The instrument was previously calibrated using a 100 mg/kg isobutylene standard (in air) and a sensitivity factor of 0 55, which relates the photo- ionization sensitivity of benzene (10 0 mg/kg) to the ionization potential of isobutylene (5 5 mg/kg) Results of these tests were used to assist in selection of samples for laboratory analysis 9200391 A/SITEPULL DOC A - 1 March 24, 1997