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' FIRESTONE Service Center 400 North El Dorado Street, Stockton, California - October 6, 1993 Site Assessment Work Plan-2072 01 Page 4 of 7 Soil samples will be collected using a standard California sampler An 19- to 24-inch drive tube (depending on equipment availability from the drilling contractor) will be used to recover soil samples The drive tube will be employed on 5-foot intervals in all borings, and as required where significant soil or lithology changes are observed in the auger cuttings. From each sampling event, in place soil samples will be collected for ' field vapor screening, visual inspection, and possible laboratory analysis The selected drilling contractor for this protect is Spectrum Drilling of Stockton, California; Spectrum's C-57 Permit Registration is 512268 Spectrum Drilling is experienced in environmental drilling practices and associated industry standards. 4.2 Decontamination The soil sampling apparatus and brass tubes will be decontaminated by scrubbing them with phosphate-free soap and rinsing with distilled water prior to and between each sample collection Disposable latex gloves and Ziploc bags will be used to prevent cross contamination of the soil samples. Auger equipment (auger flights, bits, pins, etc ) will be decontaminated with a steam-pressure washer prior to and between each boring. The drill rig will be steam-cleaned prior to on-site arrival 4.3 Description of Soils p A Ryan-Murphy geologist will direct all drilling and sampling activity and will be responsible for completion of all necessary field documentation Field evaluations of soil matrix characteristics at various depths in each boring will be made Soil descriptions will include type, texture, color, plasticity, transition zones, structure, and moisture according to the Unified Soil Classification System The on-site geologist will also note any observations of contamination and all interpretations of field conditions 4.4 Field Vapor Screening of Soils The occurrence of volatile hydrocarbon product constituents in soil will be evaluated in the field using an OVA or PID The ambient temperature headspace procedure will be performed by isolating and sealing representative portions of soil in heavy-gauge sealable plastic bags and allowing the soil to approach an ambient temperature of at least 68- degrees Fahrenheit Semiquantitative measurements will be made by puncturing the rsealed bag with the PID/OVA probe and analyzing headspace gas for VOC concentrations RYM4-MURPHY, INCORPORATM heaver Envhvnmeatal C.onsr&ncoon Management I"AMeks