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Rf1MlG1��IfANfR ' Mr. Bill Vizza • 30 November 1993 Page 3 ' After the sample was retrieved from the split-spoon sampler the ends of the middle sample tube were covered with Teflon sheets secured by tight-fitting plastic caps. The sample was ' then labelled with a unique sample number, the date and time collected, and placed in an ice-chilled cooler for preservation prior to transport to a State-certified laboratory for analyses ' Soil samples from to and bottom tubes and drill cuttings were classified using the Unified p g g ed Soil Classification System in accordance with ASTM Standard Method D2488-84, ' "Description and Identification of Soils (Visual-Manual Procedures)" Logs showing the monitoring well construction are attached to this report. ' All soil samples retrieved were screened in the field using an organic vapor analyzer (OVA). Field screening results are presented on the attached well logs Selected samples were delivered under Chain of Custody documentation to Matrix Environmental Laboratories in Rancho Cordova, a State-certified laboratory, for analysis. To minimize the potential for cross-contamination, all augers and associated equipment were steam cleaned with a high-pressure washer prior to drilling each boring. The split- spoon sampler, associated sampling equipment, and the brass sample tubes were cleaned ' with a trisodium phosphate wash and rinsed with distilled water prior to collecting each soil sample. ' Soil cuttings were placed in 17H drums for temporary storage at the site. After each boring had been drilled to its total depth, it was converted to a monitoring well. ualitative Field Screenin To provide a preliminary indication of possible hydrocarbon contamination, a portable ' organic vapor analyzer was used to perform a field hydrocarbon vapor test on soil not sent to the laboratory for analysis. The field test consisted of filling a plastic Ziplock bag with soil and sealing the bag The bags were then placed in the sun to promote the volatilization ' of petroleum hydrocarbons that may have been present in the sample. After approximately 15 minutes a hole was opened in the top of the bag and an OVA probe was inserted in the headspace and the concentration of organic vapors present in the headspace was noted in ' parts per million by volume The organic vapor analyzer used in this investigation was a Foxboro Model 128 portable OVA with a flame ionization detector, calibrated to a methane standard. ' Field screening also included visual observation of samples, noting any stainingor changes in calor or appearance which might suggest the presence or absence off g petroleum 1 1