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' Drilling spoils generated from the test borings are temporarily stored on-site in DOT-approved 55-gallon sealed steel drums Soil sample chemical test results will be used to evaluate the appropriate disposal method(s) for the spoils material Following transport and disposal of the ' drilling spoils, manifests will be forwarded to the EHD if requested Soil samples were collected in 2 5-inch diameter brass sample sleeves contained in an 18 inch- long California-modified split-spoon drive sampler advanced below the lead auger by repeated blows of a 140-pound drop hammer Samples were generally collected at 5-foot depth intervals for logging and initial screening A 5-foot long continuous core sampler was initially used during auger advancement for the installation of MW-1, however, due to poor soil sample recovery, this method was later terminated and substituted by using the 18-inch split- spoon sampler driven continuously during the advancement of boring B-1 Logging included visual, tactile and olfactory observations of soil physical characteristics and were described according to the Unified Soil Classification System and other appropriate descriptors ' Geologic logs of all soil test borings are provided in Appendix B - Soil Bormg Logs/Well Construction Details Also indicated on the boring logs are the drilling method utilized at each test boring location, total depth of each boring, monitoring well construction details, and other relevant information Appropriate decontamination procedures were followed for all soil collection and handling activities to assure sample representativeness and avoid sample contamination and formation cross-contamination Specifically, all drill augers were cleaned using a high-pressure steam cleaner prior to contacting the formation, and all drive sampler components were thoroughly ' decontaminated by brushing and agitation in Alconox laboratory detergent solution followed by triple-rinsing in clear tap water obtained from an on-site drinking water source ' All soil samples were screened by ambient temperature headspace (ATH) methods for indications of hydrocarbon contamination, and results of the headspace readings were recorded ' on the boring logs The ATH method involves placing approximately 5 cubic inches of soil into a sealed polyethylene bag and allowing the soil temperature to equilibrate for approximately 15 minutes under ambient air temperature conditions At that time, the probe of a portable organic vapor meter (OVM) or photo-ionization detector (PID), calibrated with 100 ppm isobutylene, was inserted into the bag headspace and the reading recorded Samples of material exhibiting an OVM response, and other potential indications of contamination were ' selected for laboratory analysis 2 1 2 Sample Preparation and Handling Selected soil samples were sealed with Teflon'' sheets, capped, labeled, placed in a pre-cooled P PP ice chest for preservation at 4° Celsius, and transferred under Chain-of-Custody documentation to a state-certified analytical laboratory All holding times, sample preservation, and other applicable protocols were observed during sample preparation, handling, and transportation ' 3