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Austin Road Landfill Appendix B Contaminant Plume Characterization Report Field Procedures to depths of up to 180 feet. The field geologist opened the sampler,logged the lithology,and retained the samples in heavy-duty,zip lock bags. The samples contained soil of similar lithology over approximately 1-ft depth intervals. These samples were then labeled with the sample location and depth interval. The split-barrel samplers were advanced at the same time as the drill hole to collect relatively undisturbed samples(except for the first 1-2 feet which were advanced through the material previously disturbed by the Hydropunch®groundwater sampler). Lithologic observations were recorded on boring logs by the onsite geologist. The Unified Soil Classification System(USCS)was used to describe lithologies,and symbols are consistent with those used previously by CDM at the French Camp Landfill. B.1.3 Waste Disposal Drill cuttings were generated during the drilling of borings. These cuttings were transported to the ARL for disposal. 13.2 Sampling Equipment and Cleaning All reusable field equipment used to collect,handle,or measure samples were decontaminated before coming into contact with any sample. The decontamination procedure matched the degree of contamination on the sampling tool. For example,steam cleaning was necessary to remove dirt from auger flights. Brushes and soap were required to remove dirt from split-barrel core samplers. Sampling equipment that came into contact with oil and grease had to be cleaned with organic solvent to remove the oily material. A centrally located decontamination station was established for steam cleaning of drilling equipment. This decontamination system included a pad on which the drill rig and other large drilling equipment,such as auger flights,could be steam cleaned. The drilling rig and other drilling equipment was steam cleaned between each hole. The pad was constructed so that it drained into a sump. Steam cleaning water collected in the sump was collected by a vacuum truck contractor and disposed of at the ARL Groundwater Treatment Facility. All equipment decontamination episodes were recorded in the field logbook. The general decontamination procedures are as follows: ■ A sufficient supply of tap water was obtained from the Austin Road Landfill water supply system. ■ Augers,well casing,and well screen were steam cleaned to remove all visible dirt. a Copious amounts of water with a phosphate-free detergent were used to wash and brush all dirt from the sampling item,including the steam cleaned items. CDM Camp Dresser&McKee CS 010810 g_s W:\REPORT"TOCKTOWRLPIUME.98,APPXB.WPD City o£Stockton 190855 0006